27 june 2025, movement pairs

Seeing was not exceptional, but it was good enough to open the 20-inch and go after some movement pairs -- after what seems like a long while.  Got started at 10:00pm and finished at 12:30am.  Seeing did improve through the night, and it felt great to be out observing these pairs no one else tries to see.

HU  481 AB" 508; 847x: Exceptionally fine pair, 2 Dm, PA to the southwest.  SOC grade 3 orbit, 119.5-year period, it will widen slightly in the next 20 years but remain in the southwest.    

16h 21m 14.74s +22° 59' 18.8" P.A. 237.00 sep 0.5 mag 8.21,10.04 Sp F8 dist. 66.18 pc (215.88 l.y.)

KUI  66 AB: 508; 508x: 15 Boo.  Using an apodising mask and viewing through the peephole in my eyepiece cap, with seeing only, I see very small, faint point of light inside the first diffraction ring, ESE PA, closely separated. Interesting the B star has a 10th magnitude companion!  which I did not see, of course.

14h 14m 50.85s +10° 06' 02.2" P.A. 111.00 sep 0.8 mag 5.44,8.43 Sp K1III dist. 81.23 pc (264.97 l.y.)

KUI  79 AB: 508; 508x: Excellent, nicely split, faint, light red-orange stars, near equal, SSW PA.  Split with 282x but better seen 508x.  SOC grade 1 orbit, 12.955-year period (!), it will hang at this separation for a couple more years before diving to periastron, becoming detectible again after 2030.

17h 12m 07.78s +45° 39' 57.6" P.A. 289.00 sep 0.7 mag 10.02,10.25 Sp M3V dist. 5.98 pc (19.51 l.y.)

STF1865 AB: 508; 1693x: With apodising mask and peephole, all powers, elongated N-S.  SOC grade 2 orbit, 125.24-year period, it is coming off periastron now and will be resolvable in a couple years.  Struve was lucky to discover it at apastron. 

14h 41m 08.92s +13° 43' 42.0" P.A. 265.00 sep 0.1 mag 4.46,4.55 Sp A0V+A0V dist. 53.88 pc (175.76 l.y.)

STF1998 AB 508; 282x: Xi Sco.  Nice pair, equal white stars closely split, PA NE.  SOC grade 1 orbit, 45.9-year period, it will close and be due east by 2040.

16h 04m 22.13s -11° 22' 23.2" P.A. 12.00 sep 1.2 mag 4.84,4.86 Sp F5IV+F5IV

STT 341 AB: 508; 635x: Lovely light orange stars, 1Dm, nice separation, PA ESE.  SOC grade 2 orbit, it will head further SE until 2033 when it begins a rapid dive toward periastron, not resolvable again until the 2040s.

18h 05m 49.72s +21° 26' 45.6" P.A. 89.00 sep 0.452 mag 7.39,8.82 Sp G0V+G5V dist. 39.45 pc (128.69 l.y.)