Seeing was forecast as being average to start the night and improving to "good" after 10pm. I opened up the 20-inch and indeed found the seeing to be average starting from 9pm, so I masked down to 7-inches and whipped through a large number of targets in my Struve list, mainly in Gemini and Lynx. Many pairs were very wide and I wonder why Struve bothered to measure them. But, there were some very pleasing close pairs, too. After 10pm I was getting perfect star images with the 7-inch, and there was a very close Struve pair for which I needed to go up to 20-inches, which gave me some hope the forecast was correct. I finished the list in Lynx then switched over to the "movement" list for some challenges. As it got later I could smell the moisture in the air (it is to be cloudy tonight and Wednesday), a sign transparency was failing. I closed up at midnight.
STF1144 AB 178; 140x: Faint pair, wide, 2 Dm. There is 35% parallax range overlap, 1,466 AU weighted separation, 2.1+1.2 Msol, so there is some possibility it is binary and an orbit should be tried.
07h 49m 00.84s +28° 34' 26.4" P.A. 358.00 sep 8.4 mag 7.94,10.33 Sp F0 dist. 184.16 pc (600.73 l.y.)
STF1147 AB: 178; 140x: Fine pair, light orange stars split even with low power, near equal magnitude. There is 34% parallax range overlap, only 159 AU weighted separation, 0.9+9.9 Msol, so it might be binary and an orbit should be tried.
07h 50m 19.69s +24° 31' 55.8" P.A. 175.00 sep 2.2 mag 9.66,9.68 Sp G0
STF1156 AB: 178; 140x: Wide, 2 Dm. There is -95% overlap of the parallax ranges, it is not binary.
07h 53m 47.73s +24° 43' 57.2" P.A. 194.00 sep 34.6 mag 9.50,11.46 Sp G5
STF1163 AB: 178; 140x: This is the same as STF1156.
STF1000 AB-C: 178; 140x: Wide, nearly 1 Dm. Did not try for A1061AB but should have. -25% parallax range overlap, it is not binary. No Gaia data for the Aitken secondary.
06h 59m 21.15s +25° 14' 00.2" P.A. 67.00 sep 22.1 mag 8.09,9.02 Sp F8V dist. 223.21 pc (728.11 l.y.)
STF1155 AB: 178; 140x: Very wide, 1 Dm, A is light yellow. There is no Gaia parallax data for the secondary. Did not try for COU1111 Aa-Ab, but should have! 10.0/10.0 0.4".
07h 54m 28.38s +26° 10' 01.9" P.A. 343.00 sep 16.8 mag 8.67,10.40 Sp K2 dist. 694.44 pc (2265.26 l.y.)
STF1113 AB: 178; 140x: Superwide, 2 Dm. -97% overlap of the parallax ranges, it is not binary.
07h 34m 59.32s +24° 15' 55.8" P.A. 180.00 sep 92.2 mag 7.85,11.10 Sp M0 dist. 952.38 pc (3106.66 l.y.)
STF1158 AB: 178; 140x: Wide faint pair, equal. There is 16% overlap of the parallax ranges, 4,066 AU weighted separation, 2.6+2.0 Msol, so there is some possibility to be binary and an orbit should be tried.
07h 56m 31.40s +21° 52' 28.6" P.A. 334.00 sep 7.6 mag 9.30,9.30 Sp A5III
STF1081 AB: 178; Very pretty split with 140x eighteen but best seen with 280x, 1Dm, close, dull almost blue A and red B. There is no overlap of the parallax ranges, -3%, which is a surprising result. Only 328 AU weighted separation, 2.2+1.8 Msol, which are all good results, but it likely is not binary given the parallax.
07h 24m 08.94s +21° 27' 28.0" P.A. 234.00 sep 1.9 mag 7.68,8.52 Sp B9 dist. 210.97 pc (688.18 l.y.)
STF1140 AB: 178; 140x: Pretty light yellow stars, 2 Dm, well split. There is 45% overlap of the parallax ranges, 1,160 AU weighted separation, 2.8+1.8, and the radial velocity delta 2.4 is just below the escape velocity 2.7. It is likely binary and an orbit should be tried.
07h 48m 22.61s +18° 20' 12.4" P.A. 273.00 sep 6.4 mag 7.01,8.65 Sp K0III dist. 213.22 pc (695.52 l.y.)
STF1142 AB: 178; 140x: Random wide stars, more than a little delta. There is no overlap of the parallax ranges, -98%, it is not binary.
07h 48m 22.92s +13° 25' 06.3" P.A. 211.00 sep 34.3 mag 8.37,10.91 Sp K0 dist. 230.95 pc (753.36 l.y.)
STF 946 AB: 178; 140x: Sharp white stars, 1 Dm, well split. There is no parallax range overlap, -85%, it is not binary.
06h 44m 51.62s +59° 26' 57.4" P.A. 129.00 sep 4.0 mag 7.30,9.11 Sp F5 dist. 101.11 pc (329.82 l.y.)
STF 923 AB: 178; 140x: White stars, 1 Dm, wide. There is no overlap of the parallax ranges, -91%, it is not binary.
06h 38m 06.95s +59° 26' 57.9" P.A. 144.00 sep 33.0 mag 7.57,11.47 Sp G8III dist. 226.24 pc (737.99 l.y.)
STF 948 AB: 178; 200x: 12 Lyn. Great pair, two near equal stars closely split, with a wider slightly less bright forming a triple. Seen at 140x but best at 200x. As a great surprise, there is no parallax range overlap, -3%, despite the 137 AU weighted separation and 2.4+2.1 Msol. SOC gives it a grade 4 orbit, 733-year period. I would say this one will likely turn out not to be binary.
06h 46m 14.15s +59° 26' 30.1" P.A. 64.60 sep 1.9 mag 5.44,6.00 Sp A3V dist. 65.83 pc (214.74 l.y.)
STF894 = S514 AB: 178; 140x: 5 Lyn. Light yellow A and wide, very faint B. AC is the 2 Dm pair about 3 times distant 130-degrees different. There is no parallax overlap in any case, -70%, it is not binary.
06h 26m 48.88s +58° 25' 02.7" P.A. 140.00 sep 32.4 mag 5.38,11.90 Sp K4III dist. 191.94 pc (626.11 l.y.)
STF 936 AB: 178; 280x: Quite difficult, needed best seeing for the 2 Dm B to appear at A's first diffraction ring, and only when that ring subsides in brightness. No Gaia parallax data for the secondary.
06h 39m 43.55s +58° 05' 42.1" P.A. 284.00 sep 1.1 mag 7.26,9.04 Sp G5 dist. 254.45 pc (830.02 l.y.)
STF1020 AB: 178; 140x: Wide, nearly 1 Dm. There is no parallax range overlap, -62%, it is not binary.
07h 11m 56.72s +57° 30' 27.5" P.A. 285.00 sep 13.3 mag 8.76,10.44 Sp F5
STF 916 AB: 178; 140x: Well separated pair, 1 Dm. There is no overlap of the parallax ranges, -14%, it is not binary.
06h 34m 12.46s +56° 38' 46.1" P.A. 254.00 sep 9.4 mag 9.43,10.55 Sp A3
STF1002 AB-C, A1324 AB: 508; 560x: Exquisite. The Struve is a wide equal magnitude pair, the primary of which is the Aitken, a close pair split with seeing, slightly unequal. Nice!
07h 04m 09.76s +56° 26' 24.9" P.A. 319.00 sep 30.2 mag 9.45,10.05 Sp G
STF1025 AB: 178; 140x: Wide near equal. There is no parallax range overlap, -90%, it is not binary.
07h 12m 50.93s +55° 48' 12.2" P.A. 130.00 sep 27.0 mag 8.37,8.67 Sp K0 dist. 86.51 pc (282.2 l.y.)
STF 958 AB: 178; 140x: Well split, slightly unequal light yellow stars. There is no parallax range overlap, -19%, so in spite of the close 196 AU weighted separation, 1.5+1.5 Msol, and that the radial velocity delta 0.1 is less than the escape velocity 5.2, it is not likely binary.
06h 48m 12.29s +55° 42' 15.1" P.A. 256.30 sep 4.5 mag 6.28,6.34 Sp dF5+dF6 dist. 44.27 pc (144.41 l.y.)
STF1062 AB: 178; 140x: White stars, slightly unequal, wide. There is 13% overlap of the parallax ranges, 2,923 AU weighted separation, 3.6+2.8 Msol, so there is some chance it is binary and an orbit should be tried.
07h 22m 52.06s +55° 16' 53.3" P.A. 317.00 sep 13.8 mag 5.76,6.71 Sp B8V+B9V dist. 169.2 pc (551.93 l.y.)
STF 934 AB: 178; 140x: Faint close pair, near equal. There is no overlap of the parallax ranges, -32%, it is not likely binary.
06h 39m 06.40s +55° 02' 30.2" P.A. 332.00 sep 4.1 mag 9.77,10.54 Sp A7
STF1009 AB: 178; 140x: Attractive, slightly unequal white stars, wide. There is 27% parallax range overlap, only 429 AU weighted separation, 2.0+1.9 Msol, so there is some chance it is binary and an orbit should be tried.
07h 05m 39.83s +52° 45' 31.3" P.A. 148.00 sep 4.4 mag 6.87,7.01 Sp A3Vs dist. 99.7 pc (325.22 l.y.)
STF1050 AB: 178; 140x: Wide, white stars, slightly unequal. There is 60% parallax range overlap, 4,324 AU weighted separation, 2.3+1.9 Msol, and the radial velocity delta 0.6 is less than the escape velocity 1.3. It is very likely binary and an orbit should be tried.
07h 19m 51.29s +54° 55' 18.4" P.A. 21.00 sep 19.4 mag 8.08,8.80 Sp A0V dist. 140.85 pc (459.45 l.y.)
STF1001 AB: 178; 140x: Wide, slightly unequal. There is 36% parallax range overlap, 2,174 AU weighted separation, 2.7+1.6 Msol, so it might be binary and an orbit should be tried.
07h 03m 05.51s +54° 10' 26.6" P.A. 66.00 sep 9.1 mag 7.82,9.40 Sp G0 dist. 148.59 pc (484.7 l.y.)
STF 960 AB: 170; 140x: Wide, white, nearly one delta magnitude. There is 54% parallax range overlap, 2,904 AU weighted separation, 1.9+1.2 Msol, however the radial velocity delta 1.9 slightly exceeds the escape velocity 1.4, so it might not be binary but an orbit should be tried.
06h 49m 38.96s +53° 01' 52.9" P.A. 68.00 sep 21.8 mag 7.87,9.90 Sp F0 dist. 271 pc (884 l.y.)
STF 887 AB: 178; 140x: Faint stars, significant delta magnitude, B seen with averted vision at first then can hold direct. There is no parallax range overlap, -97%, it is not binary.
06h 24m 19.47s +60° 07' 23.6" P.A. 210.00 sep 7.8 mag 11.05,12.90
STF1098 AB: 178; 140x: Wide, nearly one delta magnitude. There is no overlap of the parallax ranges, -97%, it is not binary.
07h 34m 50.49s +59° 33' 19.5" P.A. 290.00 sep 27.2 mag 10.31,10.57 Sp K0
STF937 = STF923: as described above.
STF1033 AB: 178; 140x: Very fine white pair, 1 Dm, just split with 140x, pretty. There is 33% overlap of the parallax ranges, only 280 AU weighted separation, 2.2+1.9. It is possibly binary and an orbit should be tried.
07h 14m 48.05s +52° 32' 44.1" P.A. 278.00 sep 1.5 mag 7.81,8.44 Sp F0 dist. 271 pc (884 l.y.)
STF 968 AB: 178; 140x: Wide, 1 Dm, with faint closer third star (BC) to the NE seen with averted vision. A-C has no parallax range overlap, it is not binary. AB has 50% parallax range overlap, 5,245 AU weighted separation, 2.3+1.8 Msol, and the radial velocity delta 0.8 is less than the escape velocity 1.2, so it is likely binary and an orbit should be tried.
06h 52m 52.01s +52° 40' 49.5" P.A. 289.00 sep 20.7 mag 8.28,9.19 Sp A3
STF1096 AB: 178; 140x: Wide, 1 Dm. There is 4% parallax range overlap -- but with 6% error. It is not likely binary.
07h 31m 54.77s +50° 09' 03.5" P.A. 327.00 sep 29.0 mag 8.00,10.62 Sp A0
STF1065 AB: 178; 140x: White stars, near equal, wide. There is no parallax range overlap, it is not binary.
07h 22m 15.11s +50° 08' 55.7" P.A. 256.00 sep 15.1 mag 7.51,7.67 Sp A6II dist. 283.29 pc (924.09 l.y.)
STF1093 AB: 178; 280x: Slightly unequal, hairline split, really nice! There is 28% parallax range overlap, 115 AU weighted separation, 1.5+1.4 Msol, so it is likely binary. SOC has a grade 4 orbit 715-year period.
07h 30m 16.51s +49° 58' 42.0" P.A. 207.40 sep 0.9 mag 8.79,8.98 Sp F5 dist. 90.42 pc (294.95 l.y.)
STF1091 AB: 178; 140x: In the same FOV with STF1093. Wide, equal. There is no parallax range overlap, -96%, it is not binary.
07h 29m 57.86s +49° 58' 08.8" P.A. 321.00 sep 30.0 mag 9.54,10.06 Sp G2V
STF1092 AB: 178; 200x: Very fine split at 140x, seen better with 200x, more than 1 Dm, nice close split. There is -4% parallax range overlap, it is not likely binary.
07h 30m 22.47s +49° 14' 20.4" P.A. 71.00 sep 2.9 mag 8.56,10.45 Sp A2
STF1032 AB: 178; 200x: Close pair, >1 DM, white A and blue B. Seen at 140x but better at 200x. There is no parallax range overlap, -4%, it is not likely binary.
07h 13m 52.61s +48° 29' 55.8" P.A. 114.00 sep 2.7 mag 7.32,10.34 Sp A2V dist. 148.81 pc (485.42 l.y.)
STF1040 AB: 178; 140x: Well split, 1 Dm. There is 7% parallax range overlap, 1,321 AU weighted separation, 1.7+1.2 Msol, and the radial velocity delta is less than the escape velocity 2.0. It is likely binary and an orbit should be tried.
07h 16m 20.14s +48° 12' 54.0" P.A. 261.00 sep 7.3 mag 8.79,10.34 Sp A3
STF1044 AB: 178; 140x: Wide, >1 Dm. There is 69% overlap of the parallax ranges, 1,106 AU weighted separation, 0.9+0.9 Msol, it is likely binary and needs an orbit.
07h 17m 08.96s +47° 39' 18.1" P.A. 169.00 sep 13.1 mag 10.08,10.60 Sp K0
STF1161 AB: 178; 140; 1 Dm white stars, nicely split. There is 70% overlap of the parallax ranges, only 419 AU weighted separation, 1.8+1.3 Msol, it is likely binary and needs an orbit.
07h 59m 40.77s +46° 37' 12.2" P.A. 198.00 sep 2.9 mag 8.21,9.82 Sp G0 dist. 110.13 pc (359.24 l.y.)
STF1071 AB: 178; 140x: Wide faint pair. There is no overlap of the parallax ranges, -93%, it is not binary.
07h 23m 02.50s +44° 59' 43.3" P.A. 31.00 sep 20.6 mag 9.12,10.70 Sp G0 dist. 102.77 pc (335.24 l.y.)
STF1145 AB: 178; 280x: ! Extremely fine, split with 280x and seeing, 2 Dm. Surprisingly there is no overlap of the parallax ranges, -54%, it is not binary.
07h 51m 19.02s +38° 49' 17.3" P.A. 42.00 sep 1.3 mag 8.73,10.39 Sp A3 dist. 311.53 pc (1016.21 l.y.)
STF1118 AC: 178; 140x: the struve is the nice wide one delta did not see the close hu pair
STF1139 AB: 178; 140x: Wide faint pair. There is no overlap of the parallax ranges, -96%, it is not binary
07h 49m 11.68s +37° 06' 21.1" P.A. 35.00 sep 17.3 mag 10.37,11.04 Sp F8
STF1117 AB: 178; 140x: 1 Dm, wide. There is no overlap of the parallax ranges, -61%, it is not binary.
07h 36m 43.19s +35° 23' 30.0" P.A. 228.00 sep 11.6 mag 9.10,10.59 Sp F0
STF1356 AB: 178; 140x: 1 Dm, hairline split to the ESE. easy with seven eighteen, one delta and hairline split with PA to the ESE. SOC grade 2 orbit 117.9-year period, it will hang in the SE apastron through the late 2040s, so the change will be subtle. Better viewed from 2050 to 2070 when it tightens considerably. No Gaia data for the secondary.
09h 28m 27.41s +09° 03' 24.4" P.A. 115.60 sep 0.9 mag 5.69,7.28 Sp F9IV dist. 33.17 pc (108.2 l.y.)
STF1344 AB: 178; 140x: Slightly unequal well separated pair. There is no overlap of the parallax ranges, -47%, it is not binary.
09h 23m 28.35s +39° 08' 05.1" P.A. 102.00 sep 3.8 mag 9.03,9.50 Sp F2 dist. 136.99 pc (446.86 l.y.)
STF1374 AB: 178; 140x: Closely separated, 2 Dm, light orange pair. SOC grade 4 orbit 1815-years. But, there is no overlap of the parallax ranges, -77%, it is not binary.
09h 41m 21.88s +38° 57' 01.9" P.A. 312.30 sep 2.8 mag 7.28,8.65 Sp G3IV dist. 51.28 pc (167.28 l.y.)
STF1375 AB: 178; 140x: 1 Dm, white, wide. There is no overlap of the parallax ranges, -69%, it is not binary.
09h 41m 52.96s +34° 34' 29.3" P.A. 306.00 sep 7.2 mag 8.50,10.25 Sp A2 dist. 219.78 pc (716.92 l.y.)
STF1382 AB: 178; 140x: 1 Dm wide. There is no overlap, -97% of the parallax ranges, it is not binary.
09h 49m 02.87s +34° 05' 07.9" P.A. 94.00 sep 33.5 mag 7.22,10.67 Sp A7V dist. 88.03 pc (287.15 l.y.)
KUI 48 AB: 508; 1000x: Difficult, very mildly elongated, difficult to tell PA but seems along an E-W line. SOC grade 2 orbit 17.835-years. No Gaia parallax data for either star. It will close through 2026 then widen to SE apastron by 2033.
10h 08m 15.94s +31° 36' 15.4" P.A. 181.80 sep 0.1 mag 6.90,7.20 Sp F4V dist. 61.24 pc (199.76 l.y.)
STF1728 AB: 598; 850x: Diadem. At all powers 850x and above, I see a notched elongation on a NE to SW line. The notch grows stronger with each magnification increase, and the stars appearing more as orbs. SOC grade 1 orbit 25.85-year period, edge-on orbit, it is currently closing and will be wide enough to detect again in 2028. No Gaia parallax data for either star.
13h 09m 59.28s +17° 31' 46.0" P.A. 192.20 sep 0.4 mag 4.85,5.53 Sp F5V+F6V dist. 17.83 pc (58.16 l.y.)
COU 596 AB: 508; 1000x: At all powers higher 1000x, it is very weakly misshapen from round, and I cannot tell any position angle. No Gaia data for the secondary. SOC grade 3 orbit, 38.13-year period. it is rapidly closing and will be just splittable in the early 2040s at SW apastron.
12h 40m 55.44s +27° 08' 20.9" P.A. 194.40 sep 0.1 mag 8.50,8.70 Sp F5V dist. 151.06 pc (492.76 l.y.)
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