18 may 2023

Observed through the 6-inch, with a few viewed with the 60mm.  Seeing was forecast to be better than it was.  With it staying lighter later, there was less time to observe.  Izar appeared best through the 60mm through medium to high magnification -- even in the 6-inch there was significant flaring of the primary.  I'm glad I added the 60mm to my repertoire. 

STF1691 AB: 152; 125x: 1 Dm, wide.  99% PRO, 2,660 AU WS, 1.6+1.2 Msol, and the 1.1 RVD vs 1.4 ES indicates it's binary, and an orbit should be tried.

12h 54m 59.60s +58° 09' 37.6" P.A. 276.00 sep 18.7 mag 8.58,9.80 Sp F0IV dist. 68.17 pc (222.37 l.y.)

STF1785 AB: 152; 125x: Suspected double in the 60mm scope, in the 6-inch they are pretty light orange stars, 1 Dm, closely split.  47% PRO, 40 AU WS, 0.7+0.6 Msol, it is binary and has a SOC grade 2 orbit, 156-year period.

13h 49m 04.00s +26° 58' 47.7" P.A. 191.40 sep 2.7 mag 7.36,8.15 Sp K4V+K6V dist. 13.41 pc (43.74 l.y.)

STF1779 AB: 152; 300x: Faint, visible with seeing and high power, white stars, separated, nearly 1 Dm.  88% PRO, 1,135 AU WS, 2.0+1.5 Msol, it is likely binary and needs an orbit.

13h 44m 33.98s +23° 40' 06.0" P.A. 145.00 sep 3.8 mag 9.26,10.37 Sp A5 dist. 775.19 pc (2528.67 l.y.)

STF1772 AB: 152; 125x: Bright white and quite a bit fainter B, closely separated, but wide enough for the large delta mag not to be a problem.  -13% PRO, so in spite of the other factors (447 AU WS, 2.5:1.1 Msol), it is not likely binary.

13h 40m 40.50s +19° 57' 20.4" P.A. 133.00 sep 4.4 mag 5.76,9.60 Sp A1V dist. 100.6 pc (328.16 l.y.)

STF1782 AB: 152; 125x: Wide, 1 Dm, light yellow A and blue B. -32% PRO, it is not binary.

13h 45m 06.87s +18° 22' 04.3" P.A. 185.00 sep 30.4 mag 7.98,9.81 Sp F5

STF1773 AB: 152; 125x: B seen with averted vision only, wide.  -98% PRO, it is not binary.

13h 41m 38.19s +07° 36' 21.3" P.A. 209.00 sep 30.6 mag 9.95,10.00 Sp F7V

STF1792 AB: 152; 200x: B seen with averted vision, need higher powers to see it and split from A.  -50% PRO, it is not binary.

13h 57m 03.72s +12° 27' 03.5" P.A. 291.00 sep 2.3 mag 9.98,10.89 Sp F8 dist. 1470.59 pc (4797.06 l.y.)

STF1791 AB: 152; 125x: Wide, nearly 1 Dm.  No parallax data for the primary.

13h 56m 49.22s +14° 25' 58.6" P.A. 159.00 sep 21.0 mag 9.39,10.73 Sp F7V+G1IV

STF1794 AB: 152; 300x: Excellent pair, white stars, significant delta, suspected with 125x, suspected 125x, split 200x, best 300x, with seeing.  73% PRO, 252 AU WS, 1.3+1.2 Msol, it is likely binary and needs an orbit.

13h 59m 48.26s +19° 52' 57.8" P.A. 125.00 sep 1.8 mag 9.48,9.65 Sp F8 dist. 151.29 pc (493.51 l.y.)

STF1793 AB: 152; 125x: Lovely cream-colored A and yellow B, close separation, 1 Dm.  1% PRO, 85 AU WS, 2.3+1.8 Msol, there is some chance it is binary, and an orbit should be tried.

13h 59m 05.25s +25° 48' 57.6" P.A. 243.00 sep 4.8 mag 7.46,8.39 Sp A5V dist. 153.61 pc (501.08 l.y.)

STF1839 AB: 152; 125x: Near equal, wide.  42% PRO, 1,989 AU WS, 1.5+1.5 Msol, and 0.1 RVD vs 1.7 EV, indicates it is binary and an orbit is needed.

14h 21m 27.38s +53° 53' 50.9" P.A. 83.00 sep 14.5 mag 8.84,8.92 Sp G0 dist. 178.89 pc (583.54 l.y.)

STF1821 AB: 152; 125x: Yellow A and blue B, wide, 2 Dm.  No parallax data for the secondary.

14h 13m 29.00s +51° 47' 23.8" P.A. 235.00 sep 13.8 mag 4.53,6.62 Sp A7V+F1V dist. 50.1 pc (163.43 l.y.)

STF1871 AB: 152; 125x: Very fine near equal light orange stars, closely split.  -75% PRO, it is not binary.

14h 41m 35.50s +51° 23' 51.3" P.A. 313.10 sep 1.9 mag 8.02,8.07 Sp F3V dist. 99.3 pc (323.92 l.y.)

STF1889 AB: 152; 125x: Pretty pair, white A and dull white B, nearly 1 Dm, wide.  -98% PRO, it is not binary.

14h 49m 32.37s +51° 22' 28.2" P.A. 93.00 sep 15.1 mag 6.53,9.64 Sp F3V dist. 57.11 pc (186.29 l.y.)

STF1829 AB: 152; 125x: Excellent pair, white stars, nearly 1 Dm, good close split.  27% PRO, 825 AU WS, 1.9+1.6 Msol, and 0.7 RVD vs 2.7 EV, it is likely binary and needs an orbit.

14h 15m 27.95s +50° 26' 24.6" P.A. 151.00 sep 5.6 mag 8.10,8.63 Sp F5 dist. 160.51 pc (523.58 l.y.)

STF1814 AB: 152; 125x: Near equal white stars, wide.  83% PRO, 1,304 AU WS, 1.3+1.1, RVD 0.6 vs EV 1.8, it is likely binary and needs an orbit.

14h 11m 00.99s +50° 15' 08.3" P.A. 256.00 sep 11.2 mag 9.25,9.83 Sp G5+G5

STF1890 AB: 152; 125x: Wonderful near equal yellow-white stars, tightly split with low power.  36% PRO, only 185 AU WS, 1.9+1.8 Msol, so it is likely binary.  Grade 4 SOC orbit.

14h 49m 41.37s +48° 43' 15.6" P.A. 46.00 sep 2.5 mag 6.31,6.67 Sp F6V+F5V dist. 68.59 pc (223.74 l.y.)

STF1834 AB: 152; 200x: Split at 125x, better viewed with 200x, 1 Dm closely split pair, really nice.  -12% PRO, it is not binary.

14h 20m 17.60s +48° 30' 25.1" P.A. 103.50 sep 1.6 mag 8.09,8.29 Sp F9V dist. 75.36 pc (245.82 l.y.)

16 may 2023

Observed with the 6-inch through average seeing and worsening transparency.  Still a lot seen, mostly in the south: 

STF1604 AB: 152; 125x: Very pretty triple star, forming a nearly equilateral triangle, light orange stars, the brightest >1 Dm than the next brightest, which is a half magnitude brighter than C.  Seen with the 60mm too.  AB do no share any parallax range overlap, -99%.  AC have -3% parallax range overlap, though the other specs (231 AU weighted separation, 1.0+0.6 Msol, 2.0 RVD vs. 3.5 EV) indicate binary they are all likely a line of sight asterism.

12h 09m 28.54s -11° 51' 25.4" P.A. 88.00 sep 9.0 mag 6.86,10.00 Sp G3V dist. 22.22 pc (72.48 l.y.)

 

STF1659 AB: 152; 125x: Quite the asterism: one large equilateral triangle composed of to equal magnitude white stars and one slightly unequal.  Inside this is a pointed triangle of slightly fainter stars, the two closest together are near equal magnitude and the point star 1 Dm.  The two closest stars of the inner triangle have the closest parallax, but they do not overlap, -64%.  It remains a very entertaining asterism.

12h 35m 43.75s -12° 01' 30.0" P.A. 351.00 sep 28.1 mag 7.94,8.34 Sp G0 dist. 144.51 pc (471.39 l.y.)

STF1669 AB: 152; 125x: Near equal light orange stars, close but easily split with low power.  A faint star well separated forms a pointed triangle with the main pair.  -66% parallax range overlap, it is not binary.

12h 41m 16.22s -13° 00' 53.6" P.A. 314.00 sep 5.3 mag 5.88,5.89 Sp F5V+F5V dist. 78.93 pc (257.47 l.y.)

STF1631 AB: 152; 125x: 3 Dm, wide, white stars.  -97 parallax range overlap, it is not binary.

12h 20m 09.95s -14° 07' 31.9" P.A. 305.00 sep 14.8 mag 8.38,10.95 Sp G1/2V dist. 60.75 pc (198.17 l.y.)

STF1618 AB: 152; 125x: Identical white stars, well separated.  -19% parallax range overlap, it is not binary.

12h 15m 03.46s +09° 59' 27.1" P.A. 245.00 sep 26.0 mag 9.46,9.46 Sp F5+F5 dist. 170.36 pc (555.71 l.y.)

STF1628 AB: 152; 125x: Near equal white stars, wide.  18% parallax range overlap, 1,428 AU weighted separation, 1.4+1.2 Msol, and 0.5 RVD vs 1.8 ES, it might be binary and need an orbit tried.

12h 18m 42.90s +11° 47' 46.3" P.A. 239.00 sep 9.5 mag 9.52,10.11 Sp G0 dist. 102.46 pc (334.22 l.y.)

STF1612 AB: 152; 125x: Faint pair, closely split, seen with direct vision, nice, with seeing.  72% overlap of the parallax ranges, 1,175 AU weighted separation, 1.3+1.2 Msol, and 0.6 RVD vs. 1.9 ES, it is likely binary and needs an orbit tried.

12h 12m 34.50s +10° 46' 18.2" P.A. 7.00 sep 5.6 mag 10.45,10.97 Sp G0

STF1619 AB: 152; 125x: Near equal light-yellow stars, well split, with a very wide faint C.  -12% parallax range overlap, it is not binary, in spite of the grade 5 orbit in SOC.

12h 15m 06.57s -07° 15' 26.4" P.A. 265.20 sep 6.8 mag 8.06,8.30 Sp G5 dist. 35.19 pc (114.79 l.y.)

STF1635 AB: 152; 125x: Unequal white stars, well split, with a wider, fainter C.  -37% parallax range overlap, it is not binary.

12h 21m 08.47s -11° 28' 32.7" P.A. 173.00 sep 13.4 mag 8.62,9.72 Sp B9V dist. 67.25 pc (219.37 l.y.)

STF1636 AB: 152; 125x: Brilliant white primary and 2 Dm fainter wide B.  There is 54% parallax range overlap, 625 AU weighted separation, 1.2+0.7 Msol, and 2.2 RVD vs. 2.3 ES, it may be binary and needs an orbit tried.

12h 22m 32.14s +05° 18' 20.1" P.A. 338.00 sep 21.0 mag 6.53,9.31 Sp F8V dist. 29.92 pc (97.6 l.y.)

STF1647 AB: 152; 200x: Excellent near equal pair, split with 125x but best seen at 200x. There is -8% parallax range overlap, so in spite of the 130 AU weighted separation, 1.4+1.5 Msol, and the grade 4 SOC orbit, it might not be binary.

12h 30m 33.75s +09° 42' 56.4" P.A. 249.50 sep 1.3 mag 8.09,8.37 Sp F2 dist. 92.51 pc (301.77 l.y.)

STF1648 AB: 152; 125x: Light yellow and light blue stars, good close split.  54% overlap of the parallax ranges, 2,329 AU weighted separation, 3.1+1.7 Msol, the 2.8 RVD is greater than the 1.9 ES, indicating not binary.

12h 30m 34.42s +03° 30' 29.6" P.A. 40.00 sep 8.1 mag 7.54,9.78 Sp G8III dist. 337.84 pc (1102.03 l.y.)

STF1649 AB: 152; 125x: Near equal white stars, wide.  19% overlap of the parallax ranges, 2,045 AU weighted separation, 1.8+1.6 Msol, and 0.3 RVD vs. 1.7 ES indicate it's binary and needs an orbit.

12h 31m 36.46s -11° 04' 20.2" P.A. 194.00 sep 15.7 mag 7.97,8.43 Sp A7 dist. 87.64 pc (285.88 l.y.)

STF1658 AB: 152; 150x: Close split, 1 Dm, light orange and light blue stars, very pretty.  75% PRO, 167 WS, 1.2+0.9 Msol, very likely binary and SOC provides a grade 4 obit, 1797-year period.

12h 35m 07.88s +07° 26' 34.6" P.A. 20.90 sep 2.8 mag 8.08,10.52 Sp F8 dist. 69.54 pc (226.84 l.y.)

STF1661 AB: 152; 200x: Beautiful close pair, near equal.  -40% PRO, it is not binary.  

12h 35m 57.59s +11° 24' 19.2" P.A. 254.00 sep 2.3 mag 9.21,9.24 Sp G2V dist. 84.75 pc (276.45 l.y.)

STF1664 AB: 152; 125x: A long "L" shaped asterism with a prominent orange star at the joint.  -97% PRO, it is not binary.

12h 38m 19.95s -11° 31' 01.1" P.A. 223.00 sep 38.7 mag 7.82,9.17 Sp K0 dist. 917.43 pc (2992.66 l.y.)

STF1665 AB: 152; 125x: Near equal stars, wide.  41% PRO, 382 WS, 0.8+0.7 Msol, 0.4 RVD vs. 2.7 ES, it is likely binary and needs an orbit.

12h 38m 44.27s -05° 19' 39.6" P.A. 102.00 sep 8.6 mag 9.06,9.71 Sp K0 dist. 41.44 pc (135.18 l.y.)

STF1668 AB: 152; 300x: Elongated at lower powers, need 300x to split, unequal white stars.  36% PRO, 122 WS, 1.7+1.5 Msol, it is likely binary and needs an orbit.

12h 40m 54.13s +08° 49' 45.2" P.A. 187.00 sep 1.1 mag 7.78,8.10 Sp F5V dist. 121.07 pc (394.93 l.y.)

STF1670 AB: 152; 200x: Porrima. Light orange stars, near equal, nicely split low and high power, able to split with 60mm too at high power.  No parallax data for the secondary.

12h 41m 39.60s -01° 26' 57.9" P.A. 356.20 sep 3.0 mag 3.48,3.53 Sp F0V+F0V dist. 11.68 pc (38.1 l.y.)

STF1673 AB: 152; 125x: Wide pair, 2 Dm. -40% PRO, it is not binary.

12h 42m 56.08s -02° 15' 04.0" P.A. 92.00 sep 53.6 mag 9.16,10.90 Sp K2V dist. 36.27 pc (118.31 l.y.)

STF1677 AB: 152; 125x: Unequal wide pair.  20% PRO, 3,103 WS, 2.6+2.0 Msol, 1.1 RVD vs 1.6 ES, it is likely binary and needs an orbit.

12h 45m 17.35s -03° 53' 17.0" P.A. 349.00 sep 16.1 mag 7.30,8.12 Sp A9IV dist. 262.47 pc (856.18 l.y.)

STF1682 AB: 152; 125x: Wide, 2 Dm, light orange A. -95% PRO, it is not binary.

12h 51m 22.92s -10° 20' 17.5" P.A. 299.00 sep 29.6 mag 6.59,9.69 Sp G8III dist. 156.01 pc (508.9 l.y.)

STF1683 AB: 152; 125x: Wide B seen with averted vision, then can hold direct.  -51% PRO, it is not binary.

12h 51m 40.35s -06° 07' 59.2" P.A. 197.00 sep 15.7 mag 8.45,10.69 Sp K0 dist. 490.2 pc (1599.03 l.y.)

STF1689 AB: 152; 125x: Pretty, light orange stars, wide, 1 Dm.  -95% PRO, it is not binary.

12h 55m 30.32s +11° 29' 46.4" P.A. 223.00 sep 30.2 mag 7.11,9.13 Sp M4III+F6V dist. 6.68 pc (21.79 l.y.)

STF1690 AB: 152; 125x: Blue-white A and rusty red B, 1 Dm, wide.  -81% PRO, it is not binary.

12h 56m 15.01s -04° 51' 50.3" P.A. 150.00 sep 5.8 mag 7.18,8.95 Sp A0V dist. 147.49 pc (481.11 l.y.)

STF1693 AB: 152; 125x: Near equal faint and well split pair. -12% PRO, it is not binary.

12h 56m 40.32s +07° 01' 11.8" P.A. 332.00 sep 8.7 mag 9.88,10.51 Sp G dist. 139.08 pc (453.68 l.y.)

27 april 2023

Observed with the 6-inch last night.  Seeing was good but there were thin high clouds -- or, I should say, typical Bay Area water vapor trapped overhead.  Star images were great.  I went after Struves mostly at zenith and toward Polaris, saving the more accessible pairs for later.  I also observed the pairs using the Tasco 60/1000, using a very nice Nikon zoom I bought.  It's converted from a spotting scope zoom and works very well, though it's a little heavy for the focuser, which was designed for 0.965" eyepieces.  Great views nonetheless.  After I was done with doubles after a couple hours of observing, I had a look at the half illuminated moon.  Wow.  I just love long focus refractors, the high contrast and sharpness is hard to beat.  Even though I can see more detail with the 20-inch, aesthetically, the refractors are so much more pleasing.

STF1544 AB: 152; 125x: 1 Dm, well separated.  There is -65% parallax range overlap, it is not binary.

11h 31m 18.57s +59° 42' 03.3" P.A. 91.00 sep 12.2 mag 7.33,8.02 Sp A3+Am dist. 588.24 pc (1918.84 l.y.)

STF1495 AB: 152; 125x: Light orange primary, >1 Dm, wide.  -94% parallax range overlap, it is not binary.

10h 59m 49.47s +58° 54' 23.3" P.A. 36.00 sep 34.2 mag 7.25,8.84 Sp K2II-III dist. 226.76 pc (739.69 l.y.)

STF1553 AB: 152; 125x: Pretty pair, closely split, near equal.  Was able to split it in the 60mm also.  -95% parallax range overlap, it is not binary, in spite of the SOC grade 4 orbit.

11h 36m 35.69s +56° 08' 07.3" P.A. 165.70 sep 6.2 mag 7.73,8.17 Sp G5+K7V dist. 46.99 pc (153.28 l.y.)

STF1546 AB: 152; 125x: Faint B seen with averted vision, then can hold direct, well split.  Only 1% parallax range overlap, 690 AU weighted separation, 1.4+0.7 Msol, the radial velocity delta 2.4 is just higher than the escape velocity 2.3, it is not likely binary.

11h 32m 20.34s +56° 05' 43.3" P.A. 349.00 sep 11.4 mag 7.54,10.30 Sp F8 dist. 56.69 pc (184.92 l.y.)

STF1572 AB: 152; 125x: Faint pair, well split.  47% parallax range overlap, 1,420 AU weighted separation, 1.3+1.0 Msol, and the radial velocity delta 1.1 is less than the escape velocity 1.7.  It is likely binary and needs an orbit.

11h 47m 00.74s +53° 17' 06.9" P.A. 289.00 sep 10.3 mag 9.46,10.79 Sp G dist. 160.26 pc (522.77 l.y.)

STF1510 AB: 152; 125x: Fairly closely split, 1 Dm, white stars.  29% overlap of the parallax ranges, 309 AU weighted separation, 1.3+0.9 Msol, and the radial velocity delta 1.3 is less than the escape velocity 3.6.  It is likely binary.  SOC grade 5 orbit 3156-year period.

11h 08m 00.06s +52° 49' 17.9" P.A. 327.70 sep 5.6 mag 7.65,9.03 Sp F8V dist. 55.96 pc (182.54 l.y.)

STF1520 AB: 152; 125x: Well split, 1 Dm, white stars, seen in 60mm also.  79% overlap of the parallax ranges, 482 AU weighted separation, 1.4+1.0 Msol, it might be binary and needs an orbit.

11h 16m 04.03s +52° 46' 23.4" P.A. 344.00 sep 12.4 mag 6.54,7.81 Sp F6V+F9V dist. 34.12 pc (111.3 l.y.)

STF1563 AB: 152; 125x: Wide, almost 1 Dm.   52% parallax range overlap, 1,377 AU weighted separation, 1.4+0.9 Msol, and the radial velocty delta 1.8 is just higher than the escape velocity 1.8.  It might be binary and needs an orbit.

11h 39m 23.55s +52° 11' 15.4" P.A. 157.00 sep 13.7 mag 8.58,10.64 Sp G0 dist. 83.47 pc (272.28 l.y.)

STF1587 AB: 152; 125x: B flashes with averted vision only, wide.  -15% overlap of the parallax ranges, it is not binary.

11h 59m 50.75s +51° 36' 59.9" P.A. 288.00 sep 16.8 mag 9.26,11.05 Sp G0 dist. 328.95 pc (1073.03 l.y.)

STF1562 AB: 152; 125x: Very faint pair, wide, B seen with averted vision.  -18% overlap of the parallax ranges, it is not binary.

11h 39m 13.51s +49° 09' 32.1" P.A. 270.00 sep 16.2 mag 9.76,11.60 Sp K0

STF1570 AB: 152; 125x: Well split near equal pair.  -48% overlap of the parallax ranges, it is not binary.

11h 45m 32.15s +45° 36' 13.1" P.A. 49.00 sep 10.9 mag 8.86,9.60 Sp F0 dist. 110.74 pc (361.23 l.y.)

STF1581 AB: 152; 200x: Very fine split, 1 Dm, split with 125x but better with higher power, nice.  -27% overlap of the parallax ranges, it is not binary.

11h 56m 06.32s +45° 32' 44.8" P.A. 171.00 sep 2.5 mag 9.80,10.44 Sp F8 dist. 381.68 pc (1245.04 l.y.)

STF1561 AB: 152; 125x: Light yellow, 1 Dm, well split, classic Struve.  -65% overlap of the parallax ranges, it is not binary in spite of the SOC grade 5 orbit.

11h 38m 44.90s +45° 06' 30.3" P.A. 245.50 sep 8.9 mag 6.53,8.23 Sp G0V dist. 23.25 pc (75.84 l.y.)

STF1574 AB: 152; 125x: Wide faint pair.  -18% overlap of the parallax ranges, it is not binary.

11h 51m 14.21s +44° 04' 49.7" P.A. 6.00 sep 9.4 mag 9.60,12.30 Sp G

STF1585 AB: 152; 125x: B seen with averted vision, well split.  86% overlap of the parallax ranges, 1,516 AU weighted separation, 2.3+1.4 Msol, but the radial velocity delta 2.4 is slightly more than the escape velocity 2.1, it may be physical but not remain binary, though an orbit should be tried.

11h 56m 40.53s +41° 01' 30.2" P.A. 106.00 sep 5.5 mag 8.79,11.08 Sp K0III dist. 386.1 pc (1259.46 l.y.)

STF1408 AB: 152; 125x: Fine pair, faint, <1 Dm, well split.  6% overlap of the parallax ranges, 481 AU weighted separation, 1.4+1.1 Msol, and the radial velocity detla 0.9 is less than the escape velocity 3.1.  It might be binary and needs an orbit tried.

10h 11m 21.83s +73° 02' 12.4" P.A. 14.00 sep 3.7 mag 9.01,9.98 Sp F2 dist. 137.17 pc (447.45 l.y.)

STF1393 AB: 152; 125x: Faint near equal pair, well split.  99% overlap of the parallax ranges, 3,386 AU weighted separation, 1.7+1.5 Msol, and the radial velocity delta 0.6 is less than the escape velocity 1.3.  It likely is binary and needs an orbit.

10h 01m 56.54s +73° 34' 07.1" P.A. 254.00 sep 9.7 mag 10.41,10.95 Sp F8 dist. 1492.54 pc (4868.67 l.y.)

STF1409 AB: 152; 125x: B seen with averted vision only, wide.  -79% parallax range overlap, it is not binary.

10h 15m 57.60s +79° 28' 10.0" P.A. 193.00 sep 19.3 mag 9.65,11.23 Sp F0 dist. 282.49 pc (921.48 l.y.)

STF1437 AB: 152; 125x: Near equal, very wide.  6% parallax range overlap, 2.2+1.1 Msol.  It might be binary and needs an orbit.

10h 34m 13.45s +73° 50' 04.1" P.A. 291.00 sep 23.4 mag 7.59,10.41 Sp A3 dist. 185.53 pc (605.2 l.y.)

STF1516 AC: 152; 125x: Closely split 2 Dm, B brightens with averted vision. 84% parallax overalap, only 95 AU weighted separation, 0.7+0.3 Msol, and the radial velocity delta 2.6 is less than the escape velocity 4.3, SOC grade 5 orbit 2774-year period. AB is not binary. 

11h 15m 11.91s +73° 28' 30.7" P.A. 103.00 sep 67.6 mag 7.77,8.23 Sp K5 dist. 14.65 pc (47.79 l.y.)

STF1551 AB: 152; 125x: Very faint B seen directly and brightens with averted vision.  81% overlap of the parallax ranges, 1,471 AU weighed separation, 1.9+1.2 Msol, and the radial velocity delta is the same as the escape velocity 1.9.  It may or may not remain binary, but an orbit should be tried.

11h 35m 18.37s +70° 48' 08.5" P.A. 111.00 sep 6.8 mag 9.02,10.80 Sp G5 dist. 258.4 pc (842.9 l.y.)

STF1573 AB: 152; 125x: Nice! significant delta magnitude, well split, seems to be in front of a faint cluster of stars, also seen with 60mm.  -21% overlap of the parallax ranges, it is not binary.

11h 49m 10.50s +67° 19' 42.8" P.A. 180.00 sep 10.9 mag 7.50,8.30 Sp G8III dist. 326.8 pc (1066.02 l.y.)

STF1410 AB: 152; 125x: Faint, nearly 1 Dm, well split.  41% overlap of the parallax ranges, 2,813 AU weighted separation, 2.0+1.2 Msol, but the radial velocity delta 2.2 exceeds the escape velocity 1.4, so it likely is not binary, though an orbit should be tried.

10h 37m 11.15s +86° 03' 28.3" P.A. 344.00 sep 14.4 mag 8.32,10.48 Sp F2

STF1654 AB: 152; 125x: White, 1 Dm stars, closely split.  Could split in 60mm with high power.  -11% overlap of the parallax ranges, it is not binary.

12h 32m 02.94s +74° 48' 41.5" P.A. 23.00 sep 3.8 mag 7.74,9.43 Sp G9III dist. 233.1 pc (760.37 l.y.)

STF1588 AB: 152; 125x: Slight delta mag, wide.  -97% parallax range overlap, it is not binary.

12h 02m 16.03s +72° 21' 43.1" P.A. 34.00 sep 11.7 mag 9.61,10.13 Sp K2 dist. 1369.86 pc (4468.48 l.y.)

STF1590 AB: 152; 125x: 2 Dm, closely split.  16% overlap of the parallax ranges, 979 AU weighted separation, 2.6+1.2 Msol, but the radial velocity delta 3.7 exceeds the escape velocity 2.6, it will not remain binary if it is so.

12h 01m 37.88s +70° 50' 59.6" P.A. 235.00 sep 5.4 mag 7.42,10.11 Sp K1III-IV dist. 157.23 pc (512.88 l.y.)

STF1626 AB: 152; 200x: Wonderful near equal white stars, split with 125x but better seen at 200x.  24% parallax range overlap, 354 AU weighted separation, 1.5+1.4 Msol, so it might be binary and needs an orbit.

12h 16m 47.11s +70° 08' 45.7" P.A. 2.00 sep 2.1 mag 9.37,9.55 Sp G0 dist. 157.98 pc (515.33 l.y.)

STF1602 AB: 152; 125x: Wide, 1 Dm, rather pretty.  -92% parallax range overlap, it is not binary.

12h 07m 07.57s +69° 04' 34.5" P.A. 180.00 sep 21.0 mag 8.27,9.91 Sp G5 dist. 90.42 pc (294.95 l.y.)

STF1599 AB: 152; 125x: The whole group is a lovely asterism, likely measured just for the fun of it to see if any change over time.  It's likely to be a co-moving group: AB has 52% overlap of the parallax ranges, 2,094 AU weighted separation, 2.7+1.1 Msol, but the radial velocity delta 4.8 far exceeds the escape veloctiy 1.8.

12h 05m 33.52s +68° 47' 39.7" P.A. 166.00 sep 10.1 mag 7.50,10.67 Sp K1III dist. 277.78 pc (906.12 l.y.)

STF1611 AB: 152; 125x: Very nice, very closely split with 200x, nearly 1 Dm.  41% parallax range overlap, 369 AU weighted separation, 1.7+1.2 Msol, so it might be binary and needs an orbit.

12h 11m 57.69s +68° 36' 10.5" P.A. 4.00 sep 1.9 mag 9.16,10.51 Sp F8

STF1614 AB: 152; 125x: Wide B is 2 Dm to the primary. -46% parallax range overlap, it is not binary.

12h 13m 07.94s +67° 04' 24.4" P.A. 191.00 sep 18.7 mag 8.65,11.29 Sp F8 dist. 106.38 pc (347.01 l.y.)

STF1640 AB: 152; 125x: Wide and faint B.  -98% parallax range overlap, it is not binary.

12h 24m 20.14s +63° 47' 36.0" P.A. 244.00 sep 37.9 mag 8.57,10.70 Sp K0 dist. 1162.79 pc (3793.02 l.y.)

STF1671 AB: 152; 125x: Faint near equal wide pair.  -32% parallax range overlap, it is not binary.

12h 41m 04.48s +68° 30' 57.9" P.A. 201.00 sep 29.0 mag 9.30,11.04 Sp F2V dist. 165.02 pc (538.3 l.y.)

STF1698 AB: 152; 125x: Near equal wide pair.  81% parallax range overlap, 1,519 AU weighted separation, 1.3+1.2 Msol, and the radial velocity delta 0.5 is less than the escape velocity 1.7.  It is likely binary and needs an orbit.

12h 54m 47.82s +74° 39' 06.1" P.A. 109.00 sep 10.1 mag 9.64,10.24 Sp A2

STF1767 AB: 152; 125x: Near equal well split pair.  52% parallax range overlap, 318 AU weighted separation, 1.0+1.0 Msol, it is probably binary.  SOC grade 5 orbit 3242-year period.

13h 34m 06.04s +67° 46' 07.9" P.A. 349.30 sep 4.5 mag 9.26,9.56 Sp G1V dist. 69.4 pc (226.38 l.y.)

STF1717 AB: 152; 125x: Very faint, very wide pair.  -52% overlap of the parallax ranges, it is not binary.

12h 28m 28.09s +88° 40' 32.4" P.A. 323.00 sep 8.3 mag 9.42,10.81 Sp F

 

STF1761 AB: 152; 125x: Near equal, wide, light orange stars.  No Gaia data on the primary.

13h 32m 01.67s +71° 43' 01.3" P.A. 71.00 sep 20.3 mag 9.30,10.10 Sp F8+F8 dist. 151.29 pc (493.51 l.y.)

STF1771 AB: 152; 200x: Narrowly split with 200x, 1 Dm, nice pair.  53% parallax range overlap, 194 AU weighted separation, 1.4+1.2 Msol.  Likely binary and needs an orbit.

13h 36m 41.90s +69° 46' 36.2" P.A. 83.00 sep 1.8 mag 8.77,9.37 Sp F5 dist. 98.14 pc (320.13 l.y.)

STF1798 AB: 152; 125x: 2 Dm, fairly wide.  24% parallax range overlap, 967 AU weighted separation, 1.9+1.2 Msol, and the radial velocity delta 2.0 is less than the escape velocity 2.4, it is likely binary and needs an orbit.

13h 55m 02.30s +78° 23' 59.2" P.A. 11.00 sep 7.5 mag 7.67,9.65 Sp F2 dist. 124.53 pc (406.22 l.y.)

STF1887 AB: 152; 125x: 1 Dm, fairly closely split.  -38% parallax range overlap, it is not binary.

13h 54m 57.46s +87° 23' 44.1" P.A. 227.00 sep 3.6 mag 9.18,11.20 Sp B9 dist. 176.99 pc (577.34 l.y.)

25 april 2023

Observed with the 20-inch because the seeing was to go from good to excellent late in the night.  I started out with the 7-inch mask doing Struves as usual.  I was frustrated, though, with the power issues I'm having with the scope.  It keeps cutting out, likely because of a dirty ground board (never mind I cleaned it just a few months ago).  I couldn't get the ServoCat to power up from the battery, so I had to suffer through it.  The seeing did get marginally better, and I did get one challenge "movement" pair, but the pointing accuracy was off and I couldn't find some others.

Seeing to be the same tonight but I think I'll observe with the 6-inch refractor, it's easier to use and the pointing accuracy is excellent.

STF1487 AB: 178; 140x: Lovely 1 Dm, light yellow stars, well split.  43% overlap of the parallax ranges, 626 AU weighted separation, 3.4+2.2 Msol, it is likely binary and needs an orbit.

10h 55m 36.80s +24° 44' 59.0" P.A. 112.00 sep 6.6 mag 4.48,6.30 Sp A1V+A2Vn dist. 87.95 pc (286.89 l.y.)

STF1536 AB: 178; 300x: Light yellow and light orange stars, 2 Dm, close split at 140x, best seen at 300x.  No Gaia data for the secondary.  SOC grade 2 orbit, 184.45-year period, PA is east now and will be NE by 2050 with a slightly wider separation.

11h 23m 55.37s +10° 31' 46.9" P.A. 91.50 sep 2.2 mag 4.06,6.71 Sp F4IV dist. 23.67 pc (77.21 l.y.)

STF1534 AB: 178; 140x: B seen with averted vision at first, then can hold direct, well split.  0% overlap of the parallax ranges, so in spite of the narrow 166 AU weighted separation it is not likely binary.  

11h 21m 49.34s +18° 11' 24.0" P.A. 313.50 sep 5.1 mag 8.08,11.14 Sp G5 dist. 31.05 pc (101.29 l.y.)

STF1531 AB: 178; 140x: Wide, noticeable delta magnitude.  -17% overlap of the parallax ranges, it is not binary.

11h 20m 43.56s +22° 52' 51.7" P.A. 167.00 sep 23.4 mag 9.35,10.30 Sp G5 dist. 77.64 pc (253.26 l.y.)

STF1521 AB: 178; 140x: White stars, near equal, attractive close split.  7% parallax range overlap, 462 AU weighted separation, 1.9+1.7 Msol, and the radial velocity delta 0.3 is less than the escape velocity 3.7, so this is likely binary and needs an orbit. 

11h 15m 20.95s +27° 34' 15.6" P.A. 97.00 sep 3.7 mag 7.66,8.06 Sp A5 dist. 116.28 pc (379.31 l.y.)

STF1511 AB: 178; 140x: Equal white stars, well split.  19% parallax range overlap, 1,157 AU weighted separation, 1.5+1.4 Msol, and the radial velocity delta 0.3 is less than the escape velocity 2.1, it is likely binary and needs an orbit. 

11h 07m 11.56s +10° 54' 48.2" P.A. 287.00 sep 7.6 mag 9.27,9.50 Sp K0 dist. 221.73 pc (723.28 l.y.)

STF1507 AB: 178; 140x: 1 Dm, well split.  -7% overlap of the parallax ranges, it is not binary.

11h 06m 07.42s +07° 02' 00.5" P.A. 165.00 sep 8.5 mag 8.80,10.23 Sp F8 dist. 109.29 pc (356.5 l.y.)

STF1526 AB: 178; 140x: Faint, wide, does not appear to be double.  -8% overlap of the parallax ranges, it is not binary.

11h 18m 39.02s +02° 49' 47.2" P.A. 181.00 sep 30.2 mag 10.30,10.33 Sp G0

STF1518 BC: 178; 140x: Faint super wide, does not appear to be double.  Did not notice BC, 11.26/11.50 3.5".  AB do not share parallax ranges so it is not double.  BC share 54% overlap of the parallax ranges, 785 AU weighted separation, 1.1+1.1 Msol, and are likely binary and need an orbit.

11h 14m 29.46s +05° 15' 47.0" P.A. 258.00 sep 106.9 mag 8.14,11.26 Sp K0 dist. 429.18 pc (1399.99 l.y.)

STF1527 AB: 178; 300x: Hairline split with seeing and high power, 1 Dm.  No Gaia data for the secondary.  SOC grade 3 orbit, 415-year period.   

11h 18m 59.91s +14° 16' 06.9" P.A. 305.70 sep 0.5 mag 7.01,7.99 Sp F9V dist. 30.74 pc (100.27 l.y.)

STF1528 AB: 178; 140x: 2 Dm, wide, does not appear to be double.  -92% overlap of the parallax ranges, it is not binary.

11h 19m 35.28s +09° 55' 56.9" P.A. 218.00 sep 19.3 mag 8.91,12.30 Sp A3 dist. 318.47 pc (1038.85 l.y.)

STF1529 AB: 178; 140x: Easy, wide, 1 Dm.  21% overlap of the parallax ranges, 467 AU weighted separation, 1.4+1.2 Msol, and the radial velocity delta 0.6 is less than the escape velocity 3.1, it is likely binary and needs and orbit.

11h 19m 22.64s -01° 39' 17.6" P.A. 254.00 sep 9.3 mag 7.10,7.91 Sp F6IV+dG3 dist. 48.12 pc (156.97 l.y.)

STF1530 AB: 178; 140x: 1 Dm, wide.  82% overlap of the parallax ranges, 988 AU weighted separation, 1.6+1.5 Msol, and the radial velocity delta 0.4 is less than the escape velocity 2.3, it is likely binary and needs an orbit. 

11h 19m 43.92s -06° 53' 54.8" P.A. 313.00 sep 7.6 mag 8.56,8.91 Sp F2 dist. 194.55 pc (634.62 l.y.)

STF1535 AB: 178; 140x: B seen with averted vision, well split, does not appear to be double, but there is 73% overlap of the parallax ranges, 1,345 AU weighted separation, 1.3+0.8 Msol, though the radial velocity delta 2.1 exceeds the escape velocity 1.7, so it might not be binary but an orbit should be tried. 

11h 22m 54.19s +00° 55' 38.9" P.A. 60.00 sep 10.7 mag 9.39,12.00 Sp G0

STF1540 AB: 178; 140x: 1 Dm, very wide.  There is -5% parallax range overlap, so in spite of the other data (and the SOC grade 5 orbit), it is not likely binary.

11h 26m 45.32s +03° 00' 47.2" P.A. 146.00 sep 28.6 mag 6.55,7.50 Sp G7V dist. 17.75 pc (57.9 l.y.)

STF1547 AB: 178; 140x: White stars, 1 Dm, wide.  -37% parallax range overlap, it is not binary (in spite of the SOC grade 5 orbit).

11h 31m 44.94s +14° 21' 52.2" P.A. 332.20 sep 15.3 mag 6.33,9.14 Sp G0V+G5 dist. 23.33 pc (76.1 l.y.)

STF1537 AB: 178; 200x: Noticeable delta magnitude, close split, seen at 140x, better at 200x.  26% parallax range overlap, 213 AU weighted separation, 1.5+1.2 Msol, it is likely binary and needs an orbit.

11h 24m 28.94s +20° 37' 16.5" sep 2.0 mag 8.23,9.07 Sp G0 dist. 92.59 pc (302.03 l.y.)

STF1549 AB: 178; 140x: 1 Dm, wide.  -43% parallax range overlap, it is not binary.

11h 32m 37.03s +24° 19' 23.2" P.A. 113.00 sep 12.8 mag 9.49,11.16 Sp K0

STF1552 AB: 178; 140x: Bright white stars, closely split, 1 Dm, nice.  -6% overlap of the parallax ranges, it is not likely binary.

11h 34m 42.50s +16° 47' 48.9" P.A. 209.00 sep 3.1 mag 6.26,7.31 Sp B4V+B9V dist. 581.4 pc (1896.53 l.y.)

STF1554 AB: 508; 850x: Cleanly split, PA on a NW-SW line, very near equal, seems fainter star is to the SW to me. Light orange stars, can tell it is not single at lower powers.  No Gaia data for the secondary.  SOC grade 4 orbit, 478-year period it will widen ever so slightly by 2050.

11h 36m 06.78s +12° 51' 18.8" P.A. 220.80 sep 0.3 mag 9.44,9.63 Sp G0V+G0/1V dist. 97.56 pc (318.24 l.y.)