11 march 2022 physical pairs

Seeing was forecast to be pretty good, excellent after midnight.  So I observed with the 20-inch starting around 9:30pm.  It was good enough to push the limits somewhat, and in doing so I took more time for each observation so there is a shorter list to report.  Seeing seemed to break down a bit at midnight (I could feel the air become much colder suddenly), so I decided not to go further.  Ended with some terrific views of the waxing moon which was still high enough in the sky.

A 2131 AB: 508; 1342x: Very weakly notched, significant delta, PA to the south.  WDS grade 2 orbital solution, 45.02-years.  There is no Gaia data for this pair.  Discovered on the Lick 36-inch at 0.3", PA to to the SE currently and it will fortunately widen to the discovery separation by 2030 and hopefully be easier to resolve then.
08h 54m 55.99s +26° 11' 53.8" P.A. 131.10 sep 0.2 mag 6.95,9.02 Sp G2V+K0V dist. 49.02 pc (159.9 l.y.)

HO 525 AB: 508; 445x: Beautiful white stars, near equal, hairline at 300x, better seen 445x.  WDS grade 4 orbital solution 935-year period.  Unfortunately there is no Gaia parallax for the priamry star.
08h 23m 03.71s +20° 01' 05.7" P.A. 353.50 sep 0.5 mag 9.83,9.89 Sp F5 dist. 139.86 pc (456.22 l.y.)

A 1353 AB: 508; 600x: Nice whtie stars, 1 Dm, well split, PA to southwest.  WDS grade 3 orbit, 127.25-year period.  Just coming apastron and will close to 0.4" by 2040.  No Gaia parallax data.A

11h 13m 34.66s +55° 24' 57.0" P.A. 206.10 sep 0.6 mag 7.73,9.16 Sp F5V dist. 91.83 pc (299.55 l.y.)

A 1591 AB: 508; 1334x: Notched elongation, PA to the east, 1 Dm.  Light orange stars, need the best seeing.  WDS grade 4 orbit 105-year period, it will widen slightly and make a turn to the northeast by 2040.  No Gaia data found.

11h 05m 34.65s +54° 48' 28.7" P.A. 95.40 sep 0.2 mag 8.98,9.52 Sp G0 dist. 135.87 pc (443.21 l.y.)

STF1321 AB: 508; 150x: Light yellow-orange, near equal magnitude stars, wide.  WDS grade 4 orbital solution 1986.3-year period, parallax indicates physical, 100-year proper motion.  There is 77%  parallax range overlap, 110 AU weighted separation, 0.5+0.5 Msol, and the radial velocity delta 1.2 is less than the escape velocity 3.9, so it is definitively binary.  

09h 14m 22.79s +52° 41' 11.8" P.A. 99.50 sep 17.0 mag 7.79,7.88 Sp K7V+M0V dist. 5.81 pc (18.95 l.y.)

A 1346 AB: 508; 600x: Exceptionally fine pair, white stars, 1 Dm, PA to the south.  WDS grade 4 orbit, 298-year period.  No Gaia data for the secondary.

09h 59m 05.55s +53° 15' 49.5" P.A. 178.10 sep 0.6 mag 8.84,9.66 Sp F8 dist. 125.79 pc (410.33 l.y.)

HU 731 AB: 508; 205x: Very pretty 1 Dm white stars, good split, PA northwest.  MY UMa, spectral class K0V (yellow-orange) but appeared white to me.  WDS grade 5 orbit, 207-year period, however there is -47% parallax range overlap, they are too far apart to be binary.

11h 51m 57.86s +48° 05' 19.5" P.A. 307.00 sep 1.2 mag 9.81,9.68 Sp K0V dist. 46.1 pc (150.38 l.y.)

KU 39 AB: 508; 300x: Delicate faint pair, nearly 1 Dm, easily split, PA to south.  DF UMa, Spectral class K4V yellow-orange, but I did not notice color.  WDS grade 5 orbit 278-year period.  13% parallax range overlap, only 48 AU weighted separation, 0.6+0.5 Msol, so could be binary, though the proper motion vector is -0.2.  It will make a quarter turn and widen to nearly 1" by 2040.
11h 37m 24.61s +47° 27' 44.8" P.A. 180.00 sep 0.6 mag 10.68,11.16 Sp K4V dist. 31.3 pc (102.1 l.y.)

A 1777 AB: 508; 1334x: Nice triple system, with CD as a wide 1 Dm pair of light yellow stars, and AB-C a 2 Dm blue close 4" companion to A, PA to the northeast [actually closer to due north].  AB shows only an olive shape, no notch even with high magnification, PA to the north-northwest.  WDS grade 9 (most indeterminate) orbit, 118-years, though it is not plotted and there is no Gaia data for the secondary.  The primary is an exlipsing binary DN UMa, thought to have a 640-day period.

11h 55m 05.74s +46° 28' 36.6" P.A. 358.00 sep 0.3 mag 6.50,9.00 Sp A3Vn dist. 211.86 pc (691.09 l.y.)

STT 229 AB: 508; 300x: White stars, noticably unequal, steady clean split.  WDS grade 3 orbit, 335-year period, it will tighten somewhat by 2040.  No Gaia data for the secondary.

10h 48m 02.55s +41° 06' 35.8" P.A. 253.40 sep 0.6 mag 7.62,7.92 Sp A5IV dist. 165.56 pc (540.06 l.y.)

STT 237 AB: 508; 300x: Finely split white stars, nearly 2 Dm, 2" separation, PA to southwest.  WDS grade 4 orbit, 652-year period.  However, there is -68% parallax range overlap, they are too distant to be binary.

11h 38m 57.22s +41° 08' 34.8" P.A. 243.00 sep 2.1 mag 8.11,9.32 Sp F7V dist. 79.74 pc (260.11 l.y.)