29 october 2023: Cygnus Struves

I almost didn't observe, but the night was clear and seeing not too bad.  I pointed the 6-inch refractor opposite of the rising, just past full moon, to keep the glare out of my eyes.  I covered many Struve pairs in Cygnus, which was still respectably high in the sky.  Transparency was tending poor as there was a constant stream of marine haze flowing, but seeing was ok, 6-7/10.  Some very nice pairs seen.  To end the night I scanned the moon's terminator which was close to the limb, and was amazed at the many seams between crater and mountain rangers created very dark, very thin lines.  The dark pools of shadow were darker than the sky beyond the limb.  Seeing held up enough to use 200x.  A very good night.

STF2669 AB: 152; 175x: Slightly unequal, wide.  76% PRO, 4,600 AU WS, 1.6+1.4 Msol, and the RVD 0.5 < EV 1.1, it is likely binary and needs an orbit.

20h 19m 24.48s +56° 07' 17.8" P.A. 259.00 sep 23.4 mag 9.28,9.91 Sp F5

STF2668 AB-C: 152; 150x: Close B is dark yellow color, 2 Dm.  -1% PRO but with a 10% error, only 577 AU WS, 3.1+1.7 Msol, it is possible this is binary and needs an orbit.
20h 20m 15.22s +39° 24' 11.8" P.A. 280.00 sep 3.5 mag 6.34,8.49 Sp A1V dist. 180.51 pc (588.82 l.y.)

STF2681 AB: 152; 125x: Triple forming a right-angle triangle, AB is the closer pairing, 2 Dm, but has -42% PRO, it is not binary.  AC has an even more out of range parallax and is not binary either.  CD, while they seem to have similar parallax and proper motions, do not overlap parallax ranges, and are not binary.
20h 22m 49.54s +53° 25' 02.8" P.A. 39.00 sep 6.8 mag 7.97,10.61 Sp A0V dist. 448.43 pc (1462.78 l.y.)

STF2687 AB: 152; 125x: Wide B is considerably fainter, 2 Dm.  11% PRO, 5,864 AU WS, 3.3+2.1 Msol, there is a small possibility is it binary and an orbit should be tried.
20h 26m 23.47s +56° 38' 19.3" P.A. 118.00 sep 25.1 mag 6.37,8.31 Sp B9V dist. 189.04 pc (616.65 l.y.)

STF2693 AB: 152; 125x: Attractive pair, wide, nearly 1 Dm.  28% PRO, 3,649 AU WS, 2.4+1.9 Msol, it is possible to be binary and an orbit should be tried.
20h 28m 24.22s +54° 30' 05.4" P.A. 12.00 sep 13.7 mag 8.17,9.23 Sp A0

STF2691 AB: 152; 125x: Wide, near equal.  24% PRO, 10,985 AU WS, 3.7+3.5 Msol, there is a small chance it is binary and an orbit should be tried.
20h 29m 43.18s +38° 07' 31.5" P.A. 32.00 sep 16.3 mag 8.14,8.45 Sp B6V dist. 214.13 pc (698.49 l.y.)

STF2700 AB: 152; 125x: Light orange A and blue B, nearly 1 Dm, also seen with 60mm 40x.  -18% PRO, it is not binary.
20h 34m 44.60s +32° 30' 21.1" P.A. 284.00 sep 24.1 mag 6.99,8.75 Sp K2III dist. 57.9 pc (188.87 l.y.)

STF2702 AB: 152; 125x: Beautiful near equal white pair, good separation even with low power.  86% PRO, 809 AU WS, 2.1+2.0 Msol, it is very likely binary and needs an orbit.
20h 35m 34.94s +35° 10' 10.8" P.A. 208.00 sep 3.1 mag 8.70,8.99 Sp A0

STF2705 AB: 152; 150x: Gorgeous light blue, 1 Dm close pair, very nice.  48% PRO, 1,947 AU WS, 4.8+3.7 Msol, it is likely binary and needs an orbit.
20h 37m 44.32s +33° 21' 59.4" P.A. 264.00 sep 3.1 mag 7.48,8.54 Sp K0IIb dist. 595.24 pc (1941.67 l.y.)

STF2717 AB: 152; 250x:  Very closely split, need high power and steady seeing.  A is bright, B emerges just outside the edge of A's diffraction with seeing.  -26% PRO, but only 583 AU WS, 3.3+1.8 Msol, it's a surprise to not likely to be binary.
20h 37m 48.12s +60° 45' 21.5" P.A. 259.00 sep 2.1 mag 7.34,9.46 Sp G3III dist. 263.16 pc (858.43 l.y.)

STF2707 AB: 152; 125x: Ho Hum two stars in a dense field.  Wide, 1 Dm.  -85% PRO, it is not binary.
20h 37m 51.14s +47° 56' 41.9" P.A. 29.00 sep 21.8 mag 7.94,9.45 Sp A0 dist. 172.12 pc (561.46 l.y.)

STF2708 AB: 152; 125x: Triple forming a right-angle triangle, all different magnitudes.  -99% PRO, it is not binary.
20h 38m 40.19s +38° 38' 06.3" P.A. 323.00 sep 57.9 mag 6.83,8.67 Sp G2V dist. 27.16 pc (88.6 l.y.)

STF2711 AB: 152; 150x: Closely split, 1 Dm.  70% PRO, 867 AU WS, 2.8+2.2 Msol, it is likely binary and needs an orbit.

20h 39m 35.12s +30° 30' 14.6" P.A. 223.00 sep 2.4 mag 8.17,9.24 Sp A2.5V dist. 344.83 pc (1124.84 l.y.)

STF2714 AB: 152; 125x: B is very faint, with averted vision only, wide, white. -38% PRO, it is not binary.
20h 40m 16.01s +29° 46' 49.0" P.A. 338.00 sep 6.8 mag 8.97,12.50 Sp F8

STF2719 AB: 152; 125x: Faint, unequal, wide.  89% PRO, 1,152 AU WS, 1.1+0.8 Msol, and the RVD 1.4 < EV 1.7, it is possibly binary and needs an orbit.
20h 40m 43.40s +43° 21' 00.2" P.A. 142.00 sep 14.2 mag 9.18,11.02 Sp G5

STF2716 AB: 152; 250x: Pretty light orange A and blue B, close separation, needed high power, 2 Dm.  1% PRO, 757 AU WS, 4.6+2.5 Msol, it is possible to be binary and an orbit should be tried.
20h 41m 02.54s +32° 18' 26.3" P.A. 45.00 sep 2.8 mag 5.75,8.10 Sp G2III dist. 244.5 pc (797.56 l.y.)

STF2726 AB: 152; 150x: Bright yellow-orange and very much fainter B, close separation, split with low power but better with higher.  -37% PRO, it is not binary.  
20h 45m 39.76s +30° 43' 10.8" P.A. 74.00 sep 5.8 mag 4.33,9.50 Sp K0III dist. 61.65 pc (201.1 l.y.)

STF2732 AB: 152; 125x: White unequal pair, nearly 1 Dm, closely split with low power.  52% PRO, 1,041 AU WS, 3.5+2.0 Msol, it is possibly binary and needs an orbit.
20h 48m 42.74s +51° 54' 37.1" P.A. 73.00 sep 4.3 mag 6.38,8.63 Sp B8np dist. 222.72 pc (726.51 l.y.)

STF2731 AB: 152; 125x: Excellent pair, good split, nearly 2 Dm, white stars.  -11% PRO, it is not binary.
20h 49m 00.64s +39° 47' 29.9" P.A. 86.00 sep 4.1 mag 7.65,9.59 Sp B9IV dist. 497.51 pc (1622.88 l.y.)

STF2741 AB: 152; 250x: Beautiful unequal pair, A is dull white, B is 1 Dm and bluish white, very nice.  -13% PRO, it is not binary.
20h 58m 30.03s +50° 27' 42.4" P.A. 24.00 sep 2.0 mag 5.94,6.79 Sp B5Vn dist. 331.13 pc (1080.15 l.y.)

STF2743 AB: 152; 125x: A is yellow and bright, B wide and faint and appears blue.  -18% PRO, it is not binary.
20h 59m 49.55s +47° 31' 15.4" P.A. 353.00 sep 21.0 mag 4.74,9.43 Sp B1ne dist. 434.78 pc (1418.25 l.y.)

STF2746 AB: 152; 250x: Faint pair, split with seeing, highly unequal light orange stars.  71% PRO, 208 AU WS, 2.1+1.7 Msol, it is likely binary and needs an orbit.
21h 01m 50.05s +39° 15' 38.4" P.A. 323.00 sep 1.2 mag 7.92,8.71 Sp F0 dist. 249.38 pc (813.48 l.y.)

H 4 113 AB: 152; 125x: = STF2748 Bright light orange A and wide faint B.  40% PRO, 12,128 AU WS, 6.2+4.7 Msol, but the RVD 4.7 > EV 1.1, it is not binary.
21h 02m 20.95s +39° 30' 32.5" P.A. 299.00 sep 18.9 mag 6.62,9.49 Sp K3II-III dist. 223.71 pc (729.74 l.y.)

STF2747 AB: 152; 125x: Slightly unequal, well split light-yellow stars.  -16% PRO, it is not binary.
21h 02m 21.92s +37° 39' 14.0" P.A. 266.00 sep 4.6 mag 8.45,8.66 Sp G5 dist. 44.39 pc (144.8 l.y.)

STF2757 AB: 152; 150x: Excellent unequal close pair, white.  -26% PRO, it is not binary.
21h 04m 34.72s +52° 23' 59.2" P.A. 264.00 sep 1.9 mag 7.82,9.24 Sp B9.5V dist. 227.79 pc (743.05 l.y.)

STF2753 AB: 152; 125x: White A, and wide B flashes with averted vision and then fades like an ember.  With time I can hold it direct.  -87% PRO, it is not binary.
21h 04m 57.74s +35° 25' 46.0" P.A. 335.00 sep 29.3 mag 7.38,10.74 Sp F0 dist. 277.78 pc (906.12 l.y.)

STF2758 AB: 152; 125x: Very bright, light orange, wide stars.  Strangely, Gaia is not returning any results for these stars.  SOC grade 4 orbit, 704-year period -- only 11.37 light years distant.  
21h 06m 53.95s +38° 44' 57.9" P.A. 154.00 sep 32.0 mag 5.35,6.10 Sp K5V+K7V dist. 3.49 pc (11.38 l.y.)

STF2759 AB: 152; 125x: Faint, unequal, wide.  -82% PRO, it is not binary.

21h 06m 27.66s +32° 27' 11.5" P.A. 334.00 sep 19.0 mag 8.72,10.06 Sp G5 dist. 65.36 pc (213.2 l.y.)

STF2760 AB: 152; 125x: Slightly unequal, well split.  -90% PRO, it is not binary.
21h 06m 46.78s +34° 07' 56.2" P.A. 33.00 sep 5.6 mag 7.90,8.74 Sp A4III dist. 137.17 pc (447.45 l.y.)

STF2762 AB: 152; 200x: Bright white A has a 2 Dm close companion, best seen with high power.  The pair is in a Sagitta-like asterism of other faint stars.  -9% PRO, it is not binary.
21h 08m 38.87s +30° 12' 20.5" P.A. 303.00 sep 3.3 mag 5.70,8.10 Sp B9V dist. 115.74 pc (377.54 l.y.)

STF2772 AB: 152: 125x: Faint, well split, 1 Dm, B seen averted vision then can hold direct.  -78% PRO, it is not binary.
21h 09m 54.83s +44° 21' 30.9" P.A. 224.00 sep 12.4 mag 9.51,10.93 Sp M1

STF2773 AB: 152; 200x: Excellent unequal closely separated pair, in a line of other stars of different magnitudes.  Seen with 125x but better viewed 200x.  1% PRO with the same error, 1,452 AU WS, 2.9+2.5 Msol, it is not likely binary.
21h 10m 14.01s +43° 59' 51.7" P.A. 112.00 sep 3.3 mag 8.46,9.09 Sp A0

STF2779 AB: 152; 125x: Equal, well split.  -96% PRO, it is not binary.
21h 14m 26.00s +29° 05' 08.5" P.A. 164.00 sep 15.1 mag 9.74,9.83 Sp F0

STF2785 AB: 152; 150x: Excellent pair, >1 Dm, dull yellow, closely split.  -14% PRO, it is not binary.
21h 17m 36.79s +39° 44' 46.1" P.A. 234.00 sep 2.9 mag 7.94,9.94 Sp F2V dist. 222.72 pc (726.51 l.y.)

HJ 1634 AB: 152; 125x: =STF2782. Wide, near equal.  -96% PRO, it is not binary.
21h 18m 17.00s +42° 44' 04.3" P.A. 143.00 sep 28.9 mag 9.32,9.53 Sp K0

STF2789 AB: 152; 125x: Near equal, white, wide.  98% PRO, 565 AU WS, 1.6+1.5 Msol, and the RVD 0.0 < EV 3.1, it certainly is physical, if not binary.  SOC grade 5 orbit, 18,000-year period (which seems rather outlandishly long).
21h 19m 58.84s +52° 58' 44.1" P.A. 113.00 sep 6.9 mag 7.71,7.87 Sp F8V

STF2792 AB: 152; 150x: Unequal, well split, with medium power due to faintness.  -16% PRO, it is not binary.
21h 23m 05.00s +28° 57' 18.3" P.A. 331.00 sep 7.4 mag 9.19,10.63 Sp A7 dist. 246.91 pc (805.42 l.y.)

STF2800 AB: 152; 125x: Slightly unequal, well split.  -69% PRO, it is not binary.
21h 28m 43.09s +49° 52' 06.6" P.A. 254.00 sep 9.1 mag 9.50,10.41 Sp A5 dist. 444.44 pc (1449.76 l.y.)

STF2803 AB: 152; 125x: Very wide, 1 Dm.  -80% PRO, it is not binary.
21h 29m 52.95s +52° 56' 01.8" P.A. 285.00 sep 25.9 mag 7.24,9.60 Sp B9.5IV-V

STF2802 AB: 152; 125x: Very nice, slightly unequal.  -19% PRO, it is not binary.
21h 31m 48.94s +33° 48' 56.2" P.A. 9.00 sep 3.9 mag 8.60,8.70 Sp A5 dist. 214.13 pc (698.49 l.y.)

STF2808 AC: 152; 125x: 3 Dm, very wide.  -91% PRO, it is not binary.
21h 35m 45.75s +31° 00' 34.9" P.A. 286.00 sep 42.8 mag 8.06,11.07 Sp K1V dist. 279.33 pc (911.17 l.y.)

STF2814 AB: 152; 125x: Faint, 1 Dm, well split.  68% PRO, 2,971 AU WS, 2.5+1.8 Msol, and the RVD 1.3 < EV 1.6, it is likely binary and an orbit should be tried.
21h 38m 56.31s +36° 22' 53.0" P.A. 160.00 sep 8.1 mag 8.77,9.87 Sp F0 dist. 392.16 pc (1279.23 l.y.)

STF2820 AB: 152; 125x: Exceptionally fine and faint B, wide, much fainter than bright A.  B seen directly and it brightens with averted vision.  79% PRO, 2,766 AU WS, 2.3+1.1 Msol, it is likely binary and needs an orbit.
21h 42m 34.15s +42° 26' 26.5" P.A. 230.00 sep 16.0 mag 7.48,10.56 Sp A0 dist. 153.85 pc (501.86 l.y.)

STF2822 AB: 152; 125x: Excellent if very close split with seeing and >200x only, significant delta magnitude.  No Gaia parallax data for the secondary.  SOC grade 3 orbit 692-year period.
21h 44m 08.57s +28° 44' 33.4" P.A. 325.00 sep 1.6 mag 4.75,6.18 Sp F6V+G2V dist. 22.24 pc (72.55 l.y.)

STF2832 AB: 152; 125x: Wide near equal, rich field.  -1% PRO, it is not likely binary.

21h 49m 14.48s +50° 30' 54.2" P.A. 213.00 sep 13.2 mag 7.77,8.32 Sp B9IV dist. 152.44 pc (497.26 l.y.)

STF2829 AB: 152; 125x: Unequal, wide.  -70% PRO, it is not binary.
21h 49m 23.85s +30° 45' 14.1" P.A. 15.00 sep 17.1 mag 8.91,9.66 Sp A0 dist. 125.79 pc (410.33 l.y.)

STF2846 AB: 152; 125x: Wide nearly 1 Dm, B brightens with averted vision.  No Gaia parallax data for the primary.
21h 54m 49.88s +45° 47' 29.8" P.A. 266.00 sep 3.6 mag 8.43,10.30 Sp A0 dist. 74.74 pc (243.8 l.y.)