15 march 2024

It's been clear but windy, including the jet stream raging overhead.  Seeing was variable, with higher elevations a bit better than lower.  I spent time on the 6-inch going after Struves in Leo and Ursa Major.  After logging a fair amount, I switched over to the Burnham list, especially the lower catalog numbers which he discovered with his 6-inch f/15 -- it's fun to challenge myself against him.  And, they stand more chance of being binary as they are generally more closely split.  Honestly, much of the Struve catalog is hardly worth the slewing, as nearly anything >5" turns out to be not binary.  I wonder why he even took a measure.  It's misleading to be impressed by the number of "discoveries" of the early visual observers, since they seem to have measured anything which struck their fancy, and got credit for a "discovery."  Granted they didn't have satellite parallax data to check against, but they really should have known better. 

STF1306 AB: 152; 125x: Lovely light yellow A and orange B, closely split with low power, 2 delta mag.  -36% PRO, and in spite of only 81 AU WS, 1.5+0.6 Msol, it might not be binary.  And in spite of the SOC grade 4 orbit, too, which predicts a 920-year period. 

09h 10m 23.53s +67° 08' 03.3" P.A. 346.00 sep 4.4 mag 4.87,8.85 Sp F7V dist. 20.38 pc (66.48 l.y.)

STF1312 AB: 152; 125x: Lovely half delta magnitude white pair, well split.  23% PRO, 1,910 AU WS, 2.9+2.5 Msol, and the RVD 0.7 < EV 2.2, it is possibly binary and needs an orbit.

09h 10m 18.19s +52° 23' 05.7" P.A. 147.00 sep 4.7 mag 8.35,8.80 Sp F2V dist. 952.38 pc (3106.66 l.y.)

STF1313 AB: 152; 200x: Excellent close pair, faint, white, slightly unequal, split with seeing.  At the base of a 4 star L-shaped asterism.  -82% PRO, it is not binary.

09h 13m 45.13s +69° 58' 47.4" P.A. 283.00 sep 1.1 mag 9.39,9.55 Sp G5 dist. 364.96 pc (1190.5 l.y.)

STF1314 AB: 152; 125x: Faint, superwide.  -93% PRO, it is not binary.

09h 12m 39.51s +61° 56' 28.8" P.A. 86.00 sep 47.9 mag 8.86,11.69 Sp F8 dist. 89.21 pc (291 l.y.)

STF1315 AB: 152; 125x: Near equal white stars, wide.  Also seen in the 60mm at low power.  70% PRO, 3,841 AU WS, 2.2+2.0 Msol, and the RVD 0.3 < EV 1.4, it is possibly binary and needs an orbit.

09h 12m 45.94s +61° 40' 32.7" P.A. 28.00 sep 25.1 mag 7.33,7.65 Sp A3IV dist. 100.2 pc (326.85 l.y.)

STF1318 AB: 152; 150x: Close split, nearly 1 Dm, white.  Split with low power but best at 150x.  -52% PRO, 131 AU WS, 1.2+0.9 Msol, it is possibly binary and needs an orbit.

09h 13m 38.79s +46° 59' 25.3" P.A. 227.00 sep 2.6 mag 7.85,9.51 Sp F8V dist. 52.44 pc (171.06 l.y.)

STF1321 AB: 152; 125x: Yellow-white near equal wide pair, well seen in the 60mm with low power.  77% PRO, 110 AU WS, 0.5+0.5 Msol, RVD 0.1 < EV 3.9, it is certainly binary and has a SOC grade 4 orbit 1986-year period.  

09h 14m 22.79s +52° 41' 11.8" P.A. 99.00 sep 16.9 mag 7.79,7.88 Sp K7V+M0V dist. 5.81 pc (18.95 l.y.)

STF1330 AB: 152; 125x: Superwide, faint, near equal.  49% PRO, 3,096 AU WS, 1.3+0.8 Msol, but RVD 1.8 > EV 1.1.  It is not binary.

09h 22m 14.58s +67° 10' 51.3" P.A. 303.00 sep 25.2 mag 9.37,11.52 Sp G

STF1331 AB: 152; 200x: Barest of hairline splits with seeing, near equal, high power only.  64% PRO, 221 AU WS, 2.1+2.0 Msol, it is likely binary and needs an orbit.

09h 20m 46.02s +61° 20' 58.4" P.A. 153.00 sep 0.9 mag 8.54,8.74 Sp A8IV dist. 206.61 pc (673.96 l.y.)

STF1340 AB: 152; 125x: 1 Dm, white, wide.  80% PRO, 1,288 AU WS, 2.7+1.7 Msol, it is possibly binary and needs an orbit.

09h 22m 32.22s +49° 32' 41.4" P.A. 319.00 sep 6.3 mag 7.08,8.99 Sp B9.5V dist. 226.24 pc (737.99 l.y.)

STF1341 AB: 152; 125x: Superwide, faint.  78% PRO, 1,358 AU WS, 1.0+1.0 Msol, RVD 0.1 < EV 1.6, it is probably binary and needs an orbit.

09h 22m 37.58s +50° 36' 13.5" P.A. 89.00 sep 20.5 mag 9.09,9.17 Sp G5+G5 dist. 177.62 pc (579.4 l.y.)

STF1345 AB: 152; 150x: Very fine 1 Dm pair, well split.  66% PRO, 660 AU WS, 1.9+1.5 Msol, it is probably binary and needs an orbit.

09h 26m 57.20s +64° 20' 35.7" P.A. 85.00 sep 2.9 mag 8.84,10.27 Sp A2 dist. 289.86 pc (945.52 l.y.)

STF1346 AB: 152; 125x: 1 Dm, white, well split.  -36% PRO, it is not binary.  

09h 25m 37.88s +54° 00' 57.5" P.A. 315.00 sep 5.8 mag 7.69,8.59 Sp A2V dist. 196.08 pc (639.61 l.y.)

STF1349 AB: 152; 125x: Equal, wide.  4% PRO with 2% error, 4,701 AU WS, 2.7+2.0 Msol, RVD 1.0+1.3 Msol.  It is boarderline possibly binary, an orbit should be tried.

09h 31m 09.89s +67° 32' 28.4" P.A. 166.00 sep 19.2 mag 7.54,8.98 Sp A3V dist. 549.45 pc (1792.31 l.y.)

STF1350 AB: 152; 125x: Equal, wide.  28% PRO, 1,939 AU WS, 2.0+2.0 Msol, it is possibly binary and needs an orbit.

09h 34m 19.56s +66° 47' 42.3" P.A. 249.00 sep 10.2 mag 8.26,8.31 Sp F4V+F6V dist. 225.73 pc (736.33 l.y.)

STF1351 AB: 152; 125x: Very bright yellow-white A and 4 Dm, well split B.  44% PRO, 539 AU WS, 2.1+0.6 Msol, but RVD 4.6 > EV 3.0, it is not likely binary.

09h 31m 31.57s +63° 03' 42.5" P.A. 267.00 sep 22.7 mag 3.65,9.19 Sp F0IV+K5V dist. 23.82 pc (77.7 l.y.)

STF1352 AB: 152; 125x: Very wide, faint, unequal.  98% PRO, it is not binary.

09h 29m 12.10s +43° 17' 39.9" P.A. 353.00 sep 21.7 mag 10.57,11.60 Sp G0

STF1358 AB: 152; 125x: 1 Dm, wide.  -93% PRO, it is not binary.

09h 30m 56.58s +44° 41' 02.1" P.A. 176.00 sep 24.1 mag 7.93,9.25 Sp M dist. 621.12 pc (2026.09 l.y.)

STF1359 AB: 152; 125x: 1 Dm, well split.  -78% PRO, it is not binary.

09h 32m 58.20s +56° 14' 59.1" P.A. 54.00 sep 7.5 mag 9.77,10.76 Sp G5

STF1360 AB: 152; 125x: Near equal, wide. 38% PRO, 492 AU WS, 0.8+0.8 Msol, and the RVD 0.1 < EV 2.4, it is likely binary and needs an orbit.

09h 30m 35.95s +10° 36' 06.4" P.A. 242.00 sep 13.8 mag 8.95,8.86 Sp G5 dist. 29.64 pc (96.69 l.y.)

STF1363 AB: 152; 125x: Faint, wide.  1% PRO, 880 AU WS, 1.6+0.8 Msol, but RVD 2.9 > EV 2.2, it is not binary.

09h 35m 14.09s +60° 53' 30.5" P.A. 356.00 sep 10.8 mag 7.32,10.62 Sp F0 dist. 75.64 pc (246.74 l.y.)

STF1364 AB: 152; 125x: Wide, 1 Dm, light orange stars.  15% PRO, 1,895 AU WS, 1.5+1.1 Msol, RVD 1.1 < EV 1.6, it is possibly binary and needs an orbit.

09h 32m 01.52s +20° 02' 49.3" P.A. 155.00 sep 16.2 mag 8.59,9.74 Sp F5 dist. 102.99 pc (335.95 l.y.)

STF1366 AB: 152; 125x: Faint, well split, more than 1 Dm.  94% PRO, 847 AU WS, 1.4+1.0 Msol, and RVD 1.5 < EV 2.2, it is possibly binary and needs an orbit.  

09h 35m 42.47s +53° 17' 40.4" P.A. 321.00 sep 7.8 mag 8.44,10.09 Sp F2 dist. 95.51 pc (311.55 l.y.)

STF1368 AB: 152; 125x: Faint, 1 Dm, superwide.  -21% PRO, it is not binary.

09h 36m 04.95s +53° 17' 53.9" P.A. 220.00 sep 21.9 mag 8.79,10.45 Sp F5 dist. 142.25 pc (464.02 l.y.)

STF1376 AB: 152; 125x: Near equal white stars, well split.  No parallax data for the primary.

09h 45m 01.10s +43° 13' 39.8" P.A. 309.00 sep 5.4 mag 9.07,9.05 Sp F5V dist. 130.38 pc (425.3 l.y.)

STF1379 AB: 152; 125x: Faint wide pair.  91% PRO, 596 AU WS, 1.5+0.7 Msol, but the RVD 3.0 > EV 2.5, it is not binary.

09h 45m 16.74s +08° 52' 58.0" P.A. 175.00 sep 9.8 mag 7.16,10.75 Sp F5 dist. 63.49 pc (207.1 l.y.)

STF1381 AB: 152; 200x: Very closely split with seeing, high power.  1% PRO, 134 AU WS, 1.5+1.6 Msol, is is not likely binary, though there is a SOC grade 5 orbit, 1787-year period.

09h 51m 15.22s +60° 37' 00.1" P.A. 187.00 sep 0.8 mag 8.93,9.20 Sp G0 dist. 190.11 pc (620.14 l.y.)

STF1383 AB: 152; 125x: Very faint B, wide.  -25% PRO, it is not binary. 

09h 50m 45.33s +31° 37' 50.4" P.A. 227.00 sep 22.8 mag 9.95,12.10 Sp G5

STF1384 AB: 152; 125x: Faint pair, unequal, wide.  83% PRO, 1,361 AU WS, 1.1+1.0 Msol, RVD 0.5 < EV 1.7, it is likely binary and needs an orbit.

09h 49m 56.91s +16° 19' 55.8" P.A. 183.00 sep 11.6 mag 9.76,10.02 Sp G0

STF1386 AB: 152; 150x: Difficult, with seeing, faint, close split equal pair.  -56% PRO, it is not binary.

09h 55m 04.02s +68° 54' 06.1" P.A. 111.00 sep 2.1 mag 9.30,9.34 Sp F5 dist. 168.92 pc (551.02 l.y.)

STF1387 CD: 152; 125x: In same system as STF1386, This is a faint near equal well split pair.  31% PRO, 932 AU WS, 0.9+0.9 Msol, RVD 0.1 < EV 1.8, it is likely binary and needs an orbit.  Interesting because this is closer to us it appears wider than STF1386, but it is probably binary whereas STF1386 is not.

09h 55m 02.78s +68° 56' 22.5" P.A. 273.00 sep 8.9 mag 10.73,10.67 Sp G dist. 76.75 pc (250.36 l.y.)

STF1388 AB: 152; 125x: Faint, very wide.  -38% PRO, it is not binary.

09h 52m 22.11s +28° 33' 58.4" P.A. 122.00 sep 33.4 mag 9.46,11.47 Sp F2

STF1389 AB: 152; 150x: Near equal light orange stars, close split, best seen medium power.  29% PRO, 133 AU WS, 0.8+0.9 Msol, RVD 0.3 < EV 4.8, it is likely binary.  SOC grade 4 orbit 1454-year period. 

09h 52m 26.17s +26° 58' 53.8" P.A. 290.00 sep 2.4 mag 9.12,9.50 Sp K0 dist. 57.54 pc (187.7 l.y.)

STF1390 AB: 152; 200x: 1 Dm, closely split.  41% PRO, 968 AU WS, 2.4+2.0, it is likely binary and needs an orbit.

09h 52m 08.54s +16° 27' 46.8" P.A. 207.00 sep 2.2 mag 9.31,10.12 Sp B9 dist. 366.3 pc (1194.87 l.y.)

STF1391 AB: 152; 125x: Unequal white stars, close split, it's part of equal triangle asterism of similar magnitude stars.  85% PRO, 2,769 AU WS, 1.7+1.1 Msol, RVD 1.6 > EV 1.3, it is boarderline binary and an orbit should be tried.

09h 55m 57.22s +51° 11' 27.2" P.A. 316.00 sep 13.4 mag 9.10,10.94 Sp F5

STF1392 AB: 152; 125x: Very faint B, 2 Dm, wide.  4% PRO, 2,836 AU WS, 1.7+1.2 Msol, RVD 1.9 > EV 1.3, it is not binary.

09h 56m 03.71s +29° 05' 54.8" P.A. 176.00 sep 9.4 mag 9.93,12.60 Sp G5

STF1394 AB: 152; 125x: 1 Dm, well split. 76% PRO, 318 AU WS, 1.1+0.9 Msol, RVD 0.7 < EV 3.3, it is likely binary and has a SOC grade 5 orbit 2848-year period.

09h 57m 14.57s +45° 54' 10.1" P.A. 250.00 sep 4.5 mag 8.89,9.75 Sp G0 dist. 58.11 pc (189.55 l.y.)

STF1395 AB: 152; 125x: Faint B 3 Dm, superwide.  41% PRO, 2,919 AU WS, 2.0+1.1 Msol, but RVD 3.0 > EV 1.4, it is not binary. 

09h 55m 23.11s +10° 06' 42.5" P.A. 229.00 sep 18.8 mag 8.21,10.54 Sp G5 dist. 41.49 pc (135.34 l.y.)

STF1397 AB: 152; 200x: Very tough this aperture, tiny faint B a very close split with seeing.  No parallax data for the secondary.  

09h 56m 44.80s +25° 03' 14.1" P.A. 96.00 sep 1.1 mag 9.33,10.62 Sp G0 dist. 263.16 pc (858.43 l.y.)

STF1399 AB: 152; 125x: Superwide, 1 Dm.  -2% PRO, 1,249 AU WS, 1.1+0.9 Msol, RVD 0.2 < EV 1.7, it is boarderline binary, an orbit should be tried.

09h 57m 02.21s +19° 45' 44.6" P.A. 176.00 sep 30.2 mag 7.65,8.36 Sp G0 dist. 41.77 pc (136.25 l.y.)

BU   26 AB: 152; 200x: Very distinct B seen with foveal coaxing, can then hold steady direct vision, well separated.  -77% PRO, it is not binary.

11h 23m 46.46s -10° 25' 22.1" P.A. 68.00 sep 3.0 mag 7.76,10.06 Sp K0

BU  456 AB: 152; 150x: Excellent near equal pair, hairline split.  200x further separates the stars, but seeing disturbs the image.  15% PRO, 53 AU WS, 0.8+0.8 Msol, it is possibly binary and needs an orbit.

11h 36m 49.86s -12° 21' 02.7" P.A. 162.00 sep 1.2 mag 9.56,9.73 Sp G5 dist. 48.19 pc (157.2 l.y.)

BU  458 AB: 152; 125x: Wide 1 Dm.  -47% PRO, it is not binary.

12h 04m 17.11s -21° 02' 21.0" P.A. 236.00 sep 30.1 mag 7.87,9.97 Sp A2II dist. 384.62 pc (1254.63 l.y.)

BU  589 AB: 152; 125x: B seen with foveal coaxing only, rather well separated.  11% PRO, 488 AU WS, 2.0+0.8 Msol, it is possibly binary and needs an orbit.

09h 26m 35.56s +06° 31' 49.5" P.A. 219.00 sep 3.1 mag 8.00,12.90 Sp F5 dist. 190.11 pc (620.14 l.y.)

BU  596 AB: 152; 250x: Extremely faint B star emerges with foveal coaxing and with seeing, closely split. 2% PRO, 540 AU WS, 2.7+0.9 Msol, it is possibly binary and an orbit should be tried.

10h 49m 26.81s +17° 08' 47.2" P.A. 276.00 sep 2.8 mag 7.20,13.70 Sp K0 dist. 230.41 pc (751.6 l.y.)

BU  598 AB: 152; 125x: B not seen, too faint.  -78% PRO, it is not binary.

11h 00m 44.83s +06° 06' 05.4" P.A. 219.00 sep 40.3 mag 4.99,12.60 Sp A5III dist. 46.36 pc (151.23 l.y.)

BU  600 AB: 152; 200x: I see a mere suggestion of a faint star, hazy, a dim brightening dim about 2" from the bright primary.  No parallax data for the secondary.  

11h 16m 58.18s -07° 08' 04.9" P.A. 211.00 sep 1.3 mag 6.15,10.50 Sp A8IVp dist. 129.53 pc (422.53 l.y.)

24 february 2024

A clear night but with average seeing and a steady marine haze, so I used the 6-inch.  It took a while to star align, which was frustrating, but eventually settled in for a decent night.  Ended with views of the just-past full moon, with plenty of interesting crates and mountains on the moon.  

STF 834 AB: 152; 125x: Very wide near equal.  -23% PRO, it is not binary.

06h 04m 34.24s +30° 14' 04.0" P.A. 310.00 sep 22.8 mag 8.61,9.38 Sp A dist. 25.52 pc (83.25 l.y.)

STF 845 AB: 152; 125x: Wide, 2 Dm, light orange stars.  19% PRO, 705 AU WS, 2.2+1.9 Msol, RVD 0.7 < EV 3.2, it is probably binary and an orbit should be tried.

06h 11m 36.59s +48° 42' 39.6" P.A. 358.00 sep 7.5 mag 6.16,6.86 Sp A1V+A6V dist. 102.46 pc (334.22 l.y.)

STF 862 AB: 152; 125x: Faint B seen with averted vision only well split. -45% PRO, it is not binary.

06h 12m 05.49s +29° 29' 31.7" P.A. 338.00 sep 6.9 mag 7.55,10.84 Sp G2Ib dist. 564.97 pc (1842.93 l.y.)

STF 865 AB: 152; 125x: Extremely faint, fairly close, seen best with averted vision.  97% PRO, 1,956 AU WS, 2.8+1.6 Msol, but the RVD 2.2 > EV 2.0.  An orbit should be tried if only to check the marginal results.

06h 14m 22.32s +51° 09' 59.3" P.A. 69.00 sep 5.2 mag 8.12,10.26 Sp B8 dist. 392.16 pc (1279.23 l.y.)

STF 872 AB: 152; 125x: Unequal pair, well split.  31% PRO, 872 AU WS, 1.8+1.5 Msol, it is possibly binary and needs an orbit.

06h 15m 39.06s +36° 08' 55.3" P.A. 216.00 sep 11.4 mag 6.89,7.38 Sp F4IV dist. 82.03 pc (267.58 l.y.)

STF 876 AB: 152; 125x: Faint B seen averted vision only, 2 Dm, wide.  -69% PRO, it is not binary.

06h 18m 30.80s +53° 39' 29.0" P.A. 41.00 sep 8.7 mag 9.23,11.80 Sp A5

STF 879 AB: 152; 125x: Extremely faint, seen with averted vision only, wide.  33% PRO, 1,819 AU WS, 1.5+1.1 Msol, it is possibly binary and needs an orbit.

06h 16m 18.79s +30° 04' 34.2" P.A. 70.00 sep 7.7 mag 10.10,11.40

STF 883 AB: 152; 200x: In a number five dice-face asterism, one of the corners.  Need averted vision to pull out the B star, close split even with 200x.  76% PRO, 765 AU WS, 1.7+1.6 Msol, it is likely binary and needs an orbit.

06h 19m 08.03s +39° 46' 28.7" P.A. 265.00 sep 3.5 mag 9.27,9.70 Sp F0

STF 884 AB: 152; 125x: Near equal, well split.  50% PRO, 4,484 AU WS, 2.9+2.7 Msol, it is possibly binary and an orbit should be tried.

06h 20m 33.58s +47° 07' 13.0" P.A. 272.00 sep 8.9 mag 8.68,8.94 Sp A0 dist. 507.61 pc (1655.82 l.y.)

STF 888 AB-C: 152; 125x: Close, 2 Dm.  No parallax data for the primary.

06h 19m 58.96s +28° 25' 36.6" P.A. 265.00 sep 2.9 mag 7.46,9.63 Sp A6V dist. 132.98 pc (433.78 l.y.)

STF 890 AB: 152; 125x:  B is very wide, and with averted vision only.  -76% PRO, it is not binary.

06h 21m 40.95s +36° 06' 47.0" P.A. 271.00 sep 17.8 mag 9.71,12.35 Sp A0

STF 896 AB: 152; 125x: B seen with averted vision only.  -96% PRO, it is not binary.

06h 25m 52.92s +51° 52' 31.0" P.A. 81.00 sep 18.2 mag 9.17,9.64 Sp A5

STF 902 AB: 152; 125x: Wide, very faint.  -92% PRO, it is not binary.

06h 27m 30.57s +34° 57' 19.4" P.A. 152.00 sep 11.2 mag 9.65,10.48 Sp F8

STF 903 AB: 152; 125x: Very wide, faint 4 Dm B.  14% PRO, 9,371 AU WS, 4.8+1.8 Msol, it is possibly binary and needs an orbit. 

06h 24m 20.58s -12° 57' 43.0" P.A. 295.00 sep 23.1 mag 6.12,10.49 Sp B5Ve dist. 289.02 pc (942.78 l.y.)

STF 904 AB: 152; 125x: Near equal, faint, well separated.  26% PRO, 1,523 AU WS, 1.6+1.4 Msol, and the RVD 0.5 < EV 1.9, it is likely binary and needs an orbit.

06h 30m 12.03s +51° 46' 58.8" P.A. 165.00 sep 4.9 mag 10.30,11.21 Sp F0

STF 905 AB: 152; 200x: Faint B just seen direct, very closely split. -65% PRO, it is not binary.

06h 28m 53.76s +40° 07' 11.1" P.A. 130.00 sep 1.7 mag 8.21,9.95 Sp A1IV

STF 906 AB: 152; 125x: Close, 1 Dm, averted vision needed to bring out B.  82% PRO, 805 AU WS, 1.3+1.1 Msol, it is likely binary and needs an orbit tried.

06h 28m 44.86s +37° 22' 50.6" P.A. 337.00 sep 6.5 mag 9.14,10.13 Sp F5

STF 907 AB: 152; 125x: 1 Dm faint pair, well separated.  20% PRO, 2.9+2.1 Msol, and the RVD 1.2 > EV 1.1, but only a little.  It is possibly binary and an orbit should be tried.

06h 28m 09.96s +30° 25' 12.2" P.A. 302.00 sep 11.9 mag 9.40,10.38 Sp A0V

STF 908 AB: 152; 125x: Wide, faint, near equal.  -27% PRO, it is not binary.

06h 31m 16.69s +53° 50' 52.4" P.A. 358.00 sep 8.6 mag 10.71,10.70

STF 909 AB: 152; 125x: Wide, faint.  -96% PRO, it is not binary.

06h 28m 43.55s +35° 15' 42.9" P.A. 76.00 sep 15.5 mag 8.50,11.10 Sp F8 dist. 6666.67 pc (21746.68 l.y.)

STF 912 AB: 152; 200x: Faint, very closely split.  43% PRO, 1,037 AU WS, 2.3+1.5 Msol, it is likely binary and needs an orbit.

06h 29m 46.47s +36° 36' 11.4" P.A. 28.00 sep 3.4 mag 8.76,10.90 Sp A0 dist. 420.17 pc (1370.59 l.y.)

STF 917 AB: 152; 125x: Superwide, very faint.  54% PRO, 2,526 AU WS, 1.0+0.7 Msol, but the RVD 1.6 > EV 1.1, it is not binary.

06h 33m 29.89s +52° 30' 25.8" P.A. 231.00 sep 27.7 mag 9.61,11.72

STF 918 AB: 152; 125x: Closely separated, 2 Dm.  -59% PRO, it is not binary.

06h 33m 57.62s +52° 27' 41.8" P.A. 336.00 sep 4.8 mag 7.26,8.19 Sp A3 dist. 90.58 pc (295.47 l.y.)

STF 928 AB: 152; 150x: Very close, near equal.  -1% PRO, it is not likely binary.

06h 34m 41.81s +38° 32' 24.5" P.A. 131.00 sep 3.4 mag 7.93,8.61 Sp F5 dist. 189.04 pc (616.65 l.y.)

8 february 2024 Monoceros Struves

Clear day and night, but with merely average transparency and slightly better seeing -- which seemed like a gift after so poor a season.  I observed the sun during the day, with the amazingly complex sunspot near the center of the disc (3576), very elongated and with an incredibly long and thin light bridge stretching along nearly the entire length.  Quite the sight.  Some nice prominences too.  I decided to start observing earlier in the evening, so I had about an hour before going into the house to wish the kids goodnight and take a short break.  Speaking of shorts, I seem to have one on my dew controller, as I burned through three fuses.  Fortunately, there wasn't much dew until the very end of the night, near 11pm, when a high thin haze started to spread across the sky.

STF 703 AB: 152; 125x: Extremely faint B seen averted vision only, wide.  -96% PRO, it is not binary.

06h 13m 08.25s +85° 36' 31.2" P.A. 57.00 sep 51.1 mag 9.19,11.85 Sp K5

STF 832 AB: 152; 125x: Faint B 1 Dm, averted vision only, wide.  Parallax data missing for the primary.

06h 01m 04.98s -14° 31' 22.1" P.A. 88.00 sep 24.7 mag 9.12,10.55 Sp F0V+A2Va

STF 841 AB: 152; 125x: B is very faint, averted vision only, well split.  -95% PRO, it is not binary.

06h 06m 10.75s +06° 28' 32.0" P.A. 15.00 sep 18.0 mag 9.44,12.24 Sp F8

STF 843 AB: 152; 125x: B is wide, very faint, averted vision needed to brighten, 2 Dm.  -92%PRO, it is not binary.

06h 05m 09.68s -14° 18' 34.0" P.A. 13.00 sep 24.0 mag 8.50,11.20 Sp K0III

STF 864 AC 152; 125x: Faint well split B, averted vision needed.  AB is J 1922, slightly unequal around 6" separation.  Lacks parallax data for the primary.

06h 10m 52.84s +20° 36' 33.7" P.A. 58.00 sep 22.1 mag 10.51,11.10 Sp B5+B

STF 869 AB: 152; 125x: Slightly unequal wide pair.  0% PRO, it is not likely binary.

06h 10m 44.34s -09° 51' 08.3" P.A. 280.00 sep 24.5 mag 8.18,9.09 Sp A8V+F8V

STF 870 AB: 152; 125x: Faint, slightly unequal white stars.  -95% PRO, it is not binary.

06h 13m 23.44s +14° 06' 27.1" P.A. 172.00 sep 11.0 mag 9.60,10.60 Sp G5IV

STF 875 AB: 152; 125x: Faint, well split B, just barely visible with direct vision.  -95% PRO, it is not binary.

06h 12m 08.71s -13° 08' 53.3" P.A. 323.00 sep 4.6 mag 9.19,10.38 Sp K0

STF 910 AB: 152; 125x: Super wide, 3 Dm. BC not seen, 0.5" and narrowed since discovery, it might be binary.  Parallax missing for the B companion.  

06h 26m 43.39s +00° 27' 15.2" P.A. 152.00 sep 66.0 mag 6.99,8.11 Sp G5 dist. 207.47 pc (676.77 l.y.)

STF 911 AB: 152; 125x: Near equal, wide.  -93% PRO, it is not binary.

06h 26m 52.75s +04° 04' 10.8" P.A. 155.00 sep 11.7 mag 8.65,9.04 Sp K0

STF 914 AB: 152; 125x: Wide, 2 Dm.  35% PRO, 2,436 AU WS, 2.4+1.3 Msol, but the RVD 2.2 > EV 1.6, it is not binary.

06h 26m 44.85s -07° 30' 43.0" P.A. 299.00 sep 21.1 mag 6.32,9.25 Sp A0Vn dist. 75.41 pc (245.99 l.y.)

STF 915 AB: 152; 125x: Well split, nearly 1 Dm.  A is V648 Mon.  -27% PRO, it is not binary.

06h 28m 13.96s +05° 16' 20.1" P.A. 43.00 sep 5.9 mag 7.60,8.52 Sp A1p dist. 269.54 pc (879.24 l.y.)

STF 919 AB: 60; 90x: Beta Mon. Crooked finger asterism three of near equal stars.  AB is closely but cleanly split.  Parallax data missing for B, but A and C have 77% PRO, 2,092 AU WS, 4.9+4.1 Msol, so if B is of overlapping parallax this would be a complex triple.  Would be good to have an orbit made.

06h 28m 49.07s -07° 01' 59.0" P.A. 133.00 sep 7.2 mag 4.62,5.00 Sp B4V+B2V dist. 207.47 pc (676.77 l.y.)

STF 920 AB: 152; 125x: Bright white A, wide B appears with averted vision, and I can hold it direct with foveal coaxing. 20% PRO, 6,342 AU WS, 4.6+2.3 Msol, it is possibly binary and an orbit should be tried.

06h 30m 29.22s +04° 19' 56.8" P.A. 210.00 sep 9.5 mag 7.35,10.24 Sp B2IV-V dist. 14285.71 pc (46599.99 l.y.)

STF 921 AB: 152; 125x: Wide, 3 Dm, white.  -41% PRO, it is not binary.

06h 31m 09.56s +11° 15' 05.0" P.A. 3.00 sep 16.2 mag 6.12,9.09 Sp B2V:nne dist. 303.03 pc (988.48 l.y.)

STF 926 AB: 152; 125x: Wide, unequal, white.  74% PRO, 2,444 AU WS, 2.7+1.8 Msol, it is possibly binary and an orbit should be tried.

06h 31m 40.54s +05° 46' 08.8" P.A. 287.00 sep 10.8 mag 7.23,8.62 Sp A1p dist. 71.38 pc (232.84 l.y.)

STF 927 AB: 152; 125x: Fairly close, B is faint, need averted vision to notice it.  -14% PRO, it is not likely binary.

06h 32m 07.33s +04° 58' 16.1" P.A. 85.00 sep 5.1 mag 9.16,10.30 Sp A3V

STF 930 AB: 152; 125x: Rich star field, many of which were pointlessly measured, since the parallax don't overlap.  AB is near equal, wide, -27% PRO and not binary.

06h 34m 09.26s +07° 59' 27.3" P.A. 277.00 sep 26.2 mag 8.38,9.87 Sp F8II dist. 223.71 pc (729.74 l.y.)

STF 931 AB: 152; 125x: In same field with STF930, wide 1 Dm.  -80% PRO, it is not binary.

06h 34m 20.10s +07° 59' 06.4" P.A. 23.00 sep 23.8 mag 9.64,10.51 Sp A2

STF 938 AB: 152; 125x: In same field with STF930.  Wide, 3 Dm, B seen with averted vision.  -41% PRO, it is not binary.

06h 34m 46.33s +07° 34' 21.0" P.A. 211.00 sep 11.0 mag 6.45,10.60 Sp A0Vs dist. 115.47 pc (376.66 l.y.)

STF 939 AB: 152; 125x: Very pretty asterism, forms one of an equal triangle of near equal stars.  AB -67% PRO, BC 26% PRO but the WS is 27,981 AU, far too apart to be binary.

06h 35m 55.14s +05° 18' 35.2" P.A. 107.00 sep 30.3 mag 8.39,9.20 Sp B1III dist. 621.12 pc (2026.09 l.y.)

STF 950 AB: 152; 125x: Nice cluster of a dozen near equal stars in a rough triangle asterism.  A bright star in the middle of the asterism has a close 2 Dm companion.  -15% PRO, it is not binary.

06h 40m 58.66s +09° 53' 44.7" P.A. 214.00 sep 3.0 mag 4.66,7.79 Sp O7Ve+B2: dist. 281.69 pc (918.87 l.y.)

STF 951 AB: 152; 125x: In the same field with STF950, wide 2 Dm.  No parallax or proper motion for the secondary. 

06h 40m 38.37s +09° 47' 16.0" P.A. 310.00 sep 21.3 mag 8.49,10.91 Sp B3Vnn

STF 952 MN: 152; 125x: Near equal, wide.  86% PRO, but a very wide 10,414 AU WS, 2.7+2.6 Msol might be enough to bind them, so it should be checked with an orbit.

06h 41m 10.38s +09° 53' 01.7" P.A. 116.00 sep 14.1 mag 9.75,10.05 Sp B9

STF 955 AB: 152; 125x: Near equal, wide.  3% PRO with 3% error, 967 AU WS, 3.5+3.0 Msol, it should be checked with an orbit.

06h 41m 10.25s -07° 59' 26.1" P.A. 268.00 sep 1.2 mag 8.97,9.59 Sp B9

STF 956 AB: 125x: Excellent pair, the delicate close companion seen with low power, and actually disappeared at 150x, very fine and small.  -89% PRO, it is not binary.

06h 42m 40.55s +01° 42' 58.2" P.A. 194.00 sep 6.9 mag 7.96,10.69 Sp O8.5V dist. 1030.93 pc (3362.89 l.y.)

STF 965 AB: 152; 125x: Very lovely close pair, faint B is 1 Dm. There is a wide plus one star (AD), nearly same magnitude as B.  -21% PRO, it is not binary.

06h 47m 16.12s +10° 54' 59.0" P.A. 346.00 sep 6.0 mag 8.92,10.50 Sp G0

STF 967 AB: 152; 125x: B seen averted vision only, wide. -85% PRO, it is not binary.

06h 46m 46.53s -06° 08' 41.2" P.A. 190.00 sep 13.0 mag 8.35,11.24 Sp A0 dist. 269.54 pc (879.24 l.y.)

STF 969 AB: 152; 125x: 1 Dm, well split.  -25% PRO, it is not binary.

06h 47m 57.37s -11° 06' 30.4" P.A. 317.00 sep 7.4 mag 7.80,9.83 Sp B9 dist. 483.09 pc (1575.84 l.y.)

STF 985 AB: 152; 125x: Slightly unequal, wide.

06h 53m 56.06s -04° 23' 32.8" P.A. 323.00 sep 32.6 mag 7.78,8.39 Sp K5 dist. 540.54 pc (1763.24 l.y.)

STF 986 AB: 152; 125x: Lovely unequal pair, well split, part of a long arc asterism of six stars.  84% PRO, 881 AU WS, 1.9+1.5 Msol, it is possibly binary and needs an orbit.

06h 54m 54.08s +09° 29' 56.5" P.A. 163.00 sep 5.5 mag 8.26,9.02 Sp A2

STF 987 AB: 152; 125x: Nice close split, seen with 125x but better at 200x, white, near equal.  47% PRO, only 265 AU WS, 2.5+2.7 Msol, it is likely binary and needs an orbit.

06h 54m 08.59s -05° 51' 08.6" P.A. 177.00 sep 1.4 mag 7.07,7.20 Sp A6Vn dist. 163.67 pc (533.89 l.y.)

STF 988 AB: 152; 125x: Wide, near equal.  41% PRO, 18,886 AU WS, 2.5+2.5 Msol, it is very far away to be binary, but an orbit should be tried.

06h 53m 59.18s -10° 02' 12.8" P.A. 265.00 sep 33.2 mag 9.43,9.69 Sp A2

STF 989 AB: 152; 125x: Near equal, well split.  -81% PRO, it is not binary.

06h 54m 47.88s +03° 33' 31.7" P.A. 215.00 sep 8.6 mag 9.74,10.60 Sp K0

STF 992 AB: 152; 125x: Slightly unequal, wide.  40% PRO, 1,317 AU WS, 1.3+1.0 Msol, it is possibly binary and an orbit should be tried.

06h 55m 37.68s -09° 29' 23.0" P.A. 300.00 sep 13.9 mag 8.70,9.91 Sp G0 dist. 91.24 pc (297.62 l.y.)

STF 995 AB: 152; 125x: Superwide, equal.  -79% PRO, it is not binary.

06h 57m 12.90s +11° 00' 36.7" P.A. 293.00 sep 21.8 mag 9.68,10.44

STF 998 AB: 152; 125x: Very nice close white pair.  27% PRO, 876 AU WS, 2.2+2.1 Msol, it is possibly binary and an orbit should be tried.

06h 56m 52.88s -05° 28' 44.6" P.A. 211.00 sep 3.2 mag 8.71,8.92 Sp A5 dist. 1162.79 pc (3793.02 l.y.)

STF 999 AB: 152; 125x: Listed in WDS as XMI 31.  1 Dm, wide.  -82% PRO, it is not binary.

06h 56m 44.52s -09° 00' 55.6" P.A. 309.00 sep 22.2 mag 9.00,11.40 Sp B7V

STF1003 AB: 152; 125x: Very delicate faint equal pair, close split at 125x.  6% PRO, 1,284 AU WS, 2.0+1.8 Msol, there is some possibility it's binary, an orbit should be tried.

06h 58m 34.62s -09° 10' 02.3" P.A. 321.00 sep 3.9 mag 9.57,9.92 Sp F2

STF1010 AC: 152; 125x: Equal, wide.  -78% PRO, it is not binary.

07h 01m 27.05s -03° 07' 03.3" P.A. 7.00 sep 22.3 mag 7.68,8.77 Sp O8.5IV dist. 49.68 pc (162.06 l.y.)

STF1015 AB: 152; 125x: Faint equal pair, well separated. -33% PRO, it is not binary.

07h 04m 55.36s -05° 46' 28.4" P.A. 199.00 sep 4.9 mag 9.41,9.40 Sp A0

D 12 AB: 152; 125x: Fairly bright A, 2 Dm B, rather wide.  90% PRO, 7,201 AU WS, 7.2+2.9 Msol, it is likely binary and needs an orbit.

07h 05m 49.64s -10° 39' 36.3" P.A. 282.00 sep 6.4 mag 6.51,10.08 Sp B0.5V dist. 14285.71 pc (46599.99 l.y.)

STF1019 AC: 152; 125x: Fairly bright A, 2 Dm B, very wide.  13% PRO, 40,336 AU WS, 7.2+3.3 Msol, is is not likely binary due to the wide weighted separation, but an orbit should be tried all the same.

07h 05m 49.64s -10° 39' 36.3" P.A. 292.00 sep 38.2 mag 6.51,9.55 Sp B0.5V dist. 14285.71 pc (46599.99 l.y.)

STF1028 AB: 152; 125x: Wide, equal.  32% PRO, 11,464 AU WS, 4.8+2.6 Msol, but the RVD 3.5 > EV 1.1, it is not binary.

07h 08m 16.08s -10° 37' 25.8" P.A. 303.00 sep 11.0 mag 8.59,11.10 Sp G5

STF1029 AB: 152; 125x: Near equal, hairline split with 125x, better seen 150x, light yellow-orange stars. 79% PRO, 337 AU WS, 2.5+2.2 Msol, it is likely binary and needs an orbit.

07h 07m 56.87s -04° 40' 39.8" P.A. 26.00 sep 1.6 mag 7.47,7.95 Sp A9V dist. 225.23 pc (734.7 l.y.)

STF1030 AB: 152; 125x: Wide equal stars.  -92% PRO, it is not binary.

07h 08m 48.92s -08° 40' 36.6" P.A. 45.00 sep 15.8 mag 8.52,9.87 Sp K2III dist. 699.3 pc (2281.12 l.y.)

STF1034 AB: 152; 200x: Very fine, split 125x but better seen 200x, equal white stars, part of a rectangle asterism with of three other stars of similar magnitude, slightly fainter than STF1034A.  7% PRO, 281 AU WS, 1.3+1.1 Msol, there is a slim chance it is binary, an orbit should be tried.

07h 09m 21.70s -08° 18' 58.4" P.A. 9.00 sep 2.4 mag 9.43,9.89

STF1036 AB: 152; 125x: Slightly unequal, wide, white.  -96% PRO, it is not binary.

07h 10m 12.63s -06° 16' 42.9" P.A. 102.00 sep 17.4 mag 9.22,9.92 Sp F5

STF1043 AB: 152; 150x: Exquisite close split of equal white stars.  Forms the tip of a wide triangle asterism of similar magnitude stars.  Nice rich field.  84% PRO, 977 AU WS, 2.3+2.3 Msol, it is likely binary and needs an orbit.

07h 12m 36.98s -00° 40' 46.4" P.A. 68.00 sep 2.4 mag 9.37,9.42 Sp A0

STF1045 AB: 152; 125x: Well split, 1 Dm.  -96% PRO, it is not binary.

07h 12m 42.24s -03° 10' 41.0" P.A. 236.00 sep 5.6 mag 8.01,9.08 Sp F5 dist. 73.48 pc (239.69 l.y.)

STF1049 AB: 152; 150x: Gorgeous faint unequal pair, close split at 125x, better seen 150x.  -51% PRO, it is not binary.

07h 13m 42.33s -08° 55' 31.0" P.A. 41.00 sep 3.6 mag 8.36,9.47 Sp B9.5V dist. 338.98 pc (1105.75 l.y.)

STF1052 AB: 152; 125x: Near equal wide pair, in a rich field. 40% PRO, 22,346 AU WS, 4.3+3.8 Msol, there is a chance it's binary and an orbit should be tried.

07h 14m 33.44s -10° 17' 33.5" P.A. 22.00 sep 19.9 mag 8.76,9.19 Sp B5III

STF1056 AB: 152; 125x: Pretty pair, unequal light-orange stars, 1 Dm. 79% PRO, 1,095 AU WS, 2.8+2.0 Msol, it might be binary and an orbit should be tried.

07h 15m 34.34s -01° 51' 36.8" P.A. 298.00 sep 3.9 mag 8.04,8.88 Sp G0 dist. 246.91 pc (805.42 l.y.)

STF1060 AB: 152; 125x: 1 Dm, well split.  -20% PRO, it is not binary.

07h 16m 06.71s -09° 16' 10.9" P.A. 24.00 sep 6.9 mag 8.60,9.59 Sp B7V dist. 284.9 pc (929.34 l.y.)

STF1072 AB: 152; 125x: Very wide, slightly unequal.  -83% PRO, it is not binary.

07h 19m 36.68s -04° 26' 46.7" P.A. 110.00 sep 21.8 mag 9.37,10.81 Sp A2

STF1077 AB: 152; 125x: Faint, slightly unequal white stars.  -10% PRO, it is not binary.

07h 20m 59.96s -00° 40' 13.1" P.A. 319.00 sep 5.5 mag 9.89,9.78 Sp A3

STF1084 AB: 152; 125x: Wide, >1 Dm.  -93% PRO, it is not binary.

07h 24m 01.28s -03° 58' 44.0" P.A. 284.00 sep 14.8 mag 7.20,10.00 Sp K0 dist. 3225.81 pc (10522.59 l.y.)

STF1109 AB: 152; 150x: Closely separated faint pair, equal white stars. 38% PRO, 3,023 AU WS, 3.6+3.6 Msol, it is probably binary and needs an orbit.

07h 31m 54.40s -00° 31' 30.9" P.A. 17.00 sep 3.1 mag 9.26,9.26 Sp A0

STF1111 AB: 152; 125x: Faint, wide.  -1% PRO, and with 10,571 AU WS and RVD 1.1 > EV 1.0, this is not likely binary.

07h 31m 57.66s -08° 41' 14.2" P.A. 221.00 sep 19.9 mag 8.87,9.19 Sp K0II-III

STF1112 AB: 152; 125x: Very wide, 1 Dm.  87% PRO, 682 AU WS, 1.4+0.5 Msol, but the RVD 3.6 > EV 2.2, it is not binary.

07h 32m 05.82s -08° 52' 51.3" P.A. 113.00 sep 23.9 mag 6.03,8.73 Sp F5V dist. 27.92 pc (91.08 l.y.)

STF1128 AB: 152; 125x: 1 Dm, wide.  70% PRO, 1,399 AU WS, 1.5+0.9 Msol, but RVD 2.0 > EV 1.8, it is probably not binary but an orbit should be tried, marginally possible.

07h 39m 48.82s -06° 14' 39.4" P.A. 168.00 sep 15.7 mag 7.89,10.01 Sp G4V dist. 101.21 pc (330.15 l.y.)

STF1132 AB: 152; 125x: Slightly unequal, wide, light orange stars.  -30% PRO, it is not binary.

07h 42m 12.50s -03° 31' 10.4" P.A. 234.00 sep 20.1 mag 8.13,8.49 Sp K5 dist. 288.18 pc (940.04 l.y.)

STF1133 AB: 152; 150x: Quite faint pair, closely separated, 1 Dm.  68% PRO, 958 AU WS, 1.9+1.5 Msol, and the RVD 0.8 < EV 2.5, it is very likely binary and needs an orbit tried.

07h 42m 34.02s -04° 01' 35.4" P.A. 107.00 sep 4.3 mag 8.88,9.96 Sp A5 dist. 152.21 pc (496.51 l.y.)

STF1152 AB: 152; 125x: B is quite fainter, 2 Dm, well split.  5% PRO, 1,693 AU WS, 2.5+1.6 Msol, but RVD 2.4 < EV 2.1, it is not binary.

07h 50m 59.24s -03° 07' 15.6" P.A. 313.00 sep 6.0 mag 8.41,10.29 Sp G5 dist. 316.46 pc (1032.29 l.y.)

STF1154 AB: 152; 150x: 1 Dm, close split. -16% PRO, it is not binary.

07h 52m 08.46s -03° 03' 14.9" P.A. 353.00 sep 2.8 mag 7.13,9.26 Sp A5 dist. 111.98 pc (365.28 l.y.)

STF1353 AB: 152; 150x: Faint near equal white stars, close split.  86% PRO, 339 AU WS, 1.1+1.1 Msol, it is likely binary and needs a binary.

09h 27m 39.28s +15° 44' 32.0" P.A. 125.00 sep 3.3 mag 9.91,9.98 Sp G5 dist. 96.06 pc (313.35 l.y.)

J388 AB: 152; 125x: = STF1354.  Very faint B seen with foveal coaxing, around 10" separation.  33% PRO, 2,321 AU WS, 3.2+1.6 Msol, but RVD 3.3 > EV 1.9, it is not binary.

09h 27m 32.84s +10° 53' 53.9" P.A. 351.00 sep 4.9 mag 8.62,11.80 Sp K0

STF1356 AB: 152; 200x: Hairline split in moments of good seeing, 1 Dm light orange stars.  No Gaia data for the companion.  SOC grade 2 orbit, 117.9-year period, it is near apistron now and will remain well split through 2060.

09h 28m 27.41s +09° 03' 24.4" P.A. 116.00 sep 0.9 mag 5.69,7.28 Sp F9IV dist. 33.17 pc (108.2 l.y.)