5 april 2022, leo doubles

Transparency was not very good last night, a typical warm weather marine haze settling in the Bay Area.  But seeing was pretty good, and I went after some challenge pairs in Leo with fairly good results.  Observed from 9:30pm to a bit after 11pm.  I experimented with 16-inch and 10-inch center masks, but since they were placed on the top of the mirror box they seemed to cause thermal seeing problems.  I may mount them at the top of the tube to see how they do.  The goal is better brightness and resolution with still a relatively small central obstruction.  As it was, I used my apodising mask throughout.

HDS1348 AB: 508; 150x: Obvious light yellow A and orange B, 2 Dm, wide about 9".  WDS says proper motion indicates physical.  There is 2% parallax range overlap, 281 AU weighted separation, 0.7+0.5 Msol, and the radial velocity delta 0.1 is less than the escape velocity 2.7, so it is very likely binary.
09h 23m 06.33s +22° 18' 20.4" P.A. 343.00 sep 8.3 mag 9.77,11.48 Sp M0 dist. 36.04 pc (117.56 l.y.)

COU1563 AB: 508; 150x: Nice near equal white stars, well separated, noticable Dm.  WDS uncertain, but there is -4% parallax range overlap, 930 AU weighted separation, 1.4+1.4 Msol, so not likely binary.
09h 23m 56.58s +32° 00' 22.6" P.A. 34.00 sep 2.5 mag 11.17,11.41

HU 869 AB: 508; 300x: Very fine white stars, 1 Dm, nicely split.  WDS uncertain, and no parallax data for the primary.
09h 25m 09.29s +14° 48' 36.2" P.A. 277.00 sep 0.7 mag 9.87,9.77 Sp K0

COU 935 AB: 508; 550x: Very faint haze resolves with seeing to a small point, 4 Dm and separated from the yellow-white A star.  WDS says physical, but there is -80% parallax range overlap, so it is not binary.
09h 26m 02.70s +18° 54' 02.2" P.A. 240.00 sep 0.9 mag 8.87,11.83 Sp A0 dist. 319.49 pc (1042.18 l.y.)

A 4 AB: 508; 550x: Light yellow-orange A and 2 Dm B, nicely separated around 1".  WDS uncertain, but there is -57% parallax range overlap, they are not binary.
09h 26m 17.45s +31° 08' 50.9" P.A. 37.00 sep 0.9 mag 9.59,10.69 Sp G0

COU1121 AB: 508; 300x: Very tough, very faint B seen with the best seeing, when light orange A tightens and B becomes resolves, separated around 1".  WDS uncertain, and there is -79% parallax range overlap, so they are not binary, in spite of the difficulty.

09h 28m 10.54s +28° 11' 21.8" P.A. 35.00 sep 1.0 mag 9.14,11.85 Sp K0 dist. 434.78 pc (1418.25 l.y.)

COU 936 AB: 508; 500x: Well separated around 1", white A and light orange B, 2 Dm.  WDS has 180.5-year period, it is currently near apastron.  However, Gaia shows -39% parallax range overlap, 70 AU weighted separation, 0.9+1.3 Msol -- so it is questionable whether this is binary at all.
09h 29m 00.67s +19° 17' 18.6" P.A. 224.40 sep 1.0 mag 8.42,9.96 Sp F5 dist. 83.13 pc (271.17 l.y.)

A 130 AB: 508; 300x: Quite a faint pair, slighy delta mag, needed best seeing for the 1" separation to settle.  WDS uncertain, however there is 25% parallax range overlap, 297 AU weighted separation, 1.2+1.2 Msol, so it is likely to be binary.

09h 30m 33.34s +20° 25' 48.6" P.A. 280.00 sep 1.0 mag 11.52,11.53

BU 909 AB: 508; 150x: Nice bright white A, B is very faint but plainly seen, well separated around 6".  WDS uncertain, but there is 50% parallax range overlap, 2,232 AU weighted separation, 3.5+1.2 Msol, so it is likely binary.
09h 32m 13.23s +21° 51' 23.1" P.A. 90.00 sep 6.2 mag 7.59,12.30 Sp K0III dist. 400 pc (1304.8 l.y.)

A 224 AB: 508; 150x: Well separated around 4", 1 Dm, light orange stars.  WDS says not physical, and there is -68% parallax range overlap.
09h 32m 08.01s +30° 26' 55.1" P.A. 145.00 sep 4.0 mag 10.20,11.17 Sp G

HO 368 AB: 508; 150x: White stars, significant delta mag, nice close split <2".  WDS uncertain, but there is 49% parallax range overlap, only 341 AU weighted separation, 1.4+1.6 Msol, so it is likely binary.
09h 37m 25.28s +25° 21' 36.8" P.A. 112.00 sep 1.4 mag 10.05,10.61 Sp F2

A 2479 AB: 508; 600x: Hairline split at the best moments, 1 Dm, PA WSW.  Short 108-year period, it is to make a slow rotation and tighten to the NW by 2040.  No parallax data for the B star.
09h 37m 38.81s +15° 27' 30.7" P.A. 257.60 sep 0.3 mag 9.23,9.87 Sp F8 dist. 174.52 pc (569.28 l.y.)

COU1254 Ba-Bb: 508; 550x: Very finely split, half delta mag, light yellow-white stars.  Component of ARY 51 AB, which is a super-wide separation pair.  WDS uncertain, and unfortunately there is no parallax data for either star.

09h 38m 50.20s +30° 16' 38.0" P.A. 88.00 sep 0.6 mag 10.32,10.12 Sp G0

COU 283 AB: 508; 550x: White stars, near equal, hairline split with the best seeing.  WDS uncertain, and there is no parallax data for the B star.
09h 42m 34.48s +19° 58' 01.7" P.A. 52.00 sep 0.6 mag 10.18,10.42 Sp F0

COU 776 AB: 508; 300x: Nicely split around 1", near equal, white.  WDS uncertain, but there is -21% parallax range overlap, in spite of the 293 AU weighted separation and 1.4+1.4 Msol, it is not likely binary.
09h 45m 45.65s +25° 00' 29.0" P.A. 245.00 sep 1.0 mag 10.84,11.01 Sp F8

COU 285 AB: 508; 600x: Exceptionally fine split with seeing, 1 Dm, light orange stars, very tough.  WDS uncertain, and there is no Gaia data for the B star.
09h 49m 53.92s +19° 47' 05.0" P.A. 187.00 sep 0.5 mag 9.80,10.70 Sp G5

AG 340 AB: 508; 150x: Near equal white stars, well separated around 5".  WDS uncertain, and there is no Gaia data for the primary.
09h 50m 28.65s +26° 02' 25.1" P.A. 310.00 sep 4.8 mag 10.10,10.60

COU 49 AB: 508; 200x: Fine pair, 1 Dm, well separated.  GII 80 not seen, near equal 0.2" to the B star.  WDS uncertain, and unfortunately no Gaia data for the B star.

09h 50m 54.20s +20° 15' 25.0" P.A. 357.00 sep 2.2 mag 10.30,11.10

A 344 AB: 508; 300x: Hairline split, slight delta mag, yellow-white stars.  WDS uncertain, and there is no Gaia data for the B star. 
09h 52m 06.88s +29° 15' 52.2" P.A. 68.00 sep 0.7 mag 9.63,9.96 Sp F8