15 june 2021

Finally, after a couple weeks of skies ruined by marine layer or wind, I had the chance to observe last night.  Seeing was good enough to use full aperture, but not perfect, so I used an apodising mask throughout.  I couldn't go down to the limits of the scope, but I was able to see come compelling pairs.  Transparency was softened by some marine haze.

Planes on approach to Oakland really wreck havoc on my seeing.  Just like a disturbance in a pool, it takes several minutes for their wake to settle out of the air.  I remember watching a line of plane wake slide over the face of the moon, with creases on either end diffract as they moved along either edge until they rejoined on the other side.  So I try to point away from the main flight path, but there's still disturbance.  Unfortunately the flight path is near zenith and the best part of the sky for viewing.  One just needs patience.  When one is coming I do my best to concentrate on the star; when it arrives I take a slight break, or maybe change eyepieces.

I would have observed longer, but the seeing seemed to deteriorate.  There should be some more good weather coming.

A 2065 AB: 508; 205x: Very fine pair, white A, 2 delta, very close but nice split.  WDS lists as uncertain but the EDR3 data show there is no parallax overlap (by a lot), so these are a comoving but not gravitationally bound pair.
14h 08m 19.11s +16° 43' 32.9" P.A. 342.00 sep 1.6 mag 9.52,11.13 Sp F5 dist. 152.21 pc (496.51 l.y.)

A 1098 AB: 508; 205x: Very light yellow-orange A, 2 delta, well separated B.  Not physical (no parallax overlap and proper motions are divergent).
14h 09m 49.14s +08° 22' 04.9" P.A. 282.00 sep 3.8 mag 9.20,11.20 Sp K0

HDS1989 Aa-Ab: 508; 1067x: Light orange, not round at all powers, it is misshapen with a small lump on one side, disks will not resolve.  EDR3 does not show any such close companion!  Maybe my "not round" is confirmation bias?
14h 10m 55.76s +15° 12' 55.7" P.A. 335.00 sep 0.4 mag 8.53,10.86 Sp G0 dist. 60.46 pc (197.22 l.y.)

A 1100 AB: 508; 533x: Subtle notched elongation.  EDR3 does not show any close companion.
14h 13m 50.60s +08° 58' 51.1" P.A. 173.00 sep 0.2 mag 8.40,9.30 Sp A5

HEI 530 AB: 508; 533x: Very brief split of unequal white stars, with seeing only.  EDR3 does not show any close companion
14h 14m 07.87s +10° 55' 46.7" P.A. 353.00 sep 0.5 mag 9.68,10.23 Sp G5

COU 482 AB: 508; 445x: ! Excellent white pair, brief splits with seeing at 205x, easy steady split with six, slightly unequal.  Uncertain in WDS, and no parallax data in EDR3
14h 21m 20.69s +30° 50' 07.1" P.A. 121.00 sep 0.6 mag 9.92,9.98 Sp G0

AGC 6 AB: 508; 445x: Small scale split with 205x, easy split with 445x.   Near Arcturus, so in wide field it looks like debris from the bright star.  No parallax data for the A star in EDR3
14h 33m 55.72s +29° 49' 19.1" P.A. 133.00 sep 0.8 mag 9.81,10.30 Sp G0III

A 347 AB: 508; 445x: Near equal white stars, suspected double at 205x, easy split at 445x.  Binary with 236.4-year period.
14h 36m 56.24s +48° 13' 17.9" P.A. 232.80 sep 0.6 mag 8.68,8.37 Sp F2 dist. 106.04 pc (345.9 l.y.)

STT 283 A-BC: 508; 205x: Faint and slightly reddish B, maybe due to faintness, bright white A, well separated.  HU 57 BC not tried for, 12.62/11.77 1.2".  WDS says A-BC is physical, however there is no parallax overlap -- it's not binary. 
14h 32m 30.86s +49° 11' 02.6" P.A. 130.00 sep 5.9 mag 8.08,12.62 Sp F5 dist. 87.41 pc (285.13 l.y.)

COU1586 AB: 508; 205x: Well seen at 205x, very bright white A and faint B hanging close to it, separated.  WDS says physical and I'd agree, it's s strong possibility of binarity.

14h 33m 44.62s +43° 00' 28.1" P.A. 143.00 sep 1.8 mag 6.82,10.27 Sp A2 dist. 79.62 pc (259.72 l.y.)

 

COU1587 AB: 508; 533x: Elongation at 205x since its faint, more magnification lengthens the elongation but it becomes more of a smear, transparency seems to be hindering resolution.  Uncertain in WDS, unfortunately no parallax data in EDR3.
14h 34m 02.12s +45° 00' 12.2" P.A. 27.00 sep 0.8 mag 11.44,11.68 Sp G0

A 1622 AB: 508; 205x: White A and dull-to-reddish B, well separated around 2" and 2 delta mag.  Uncertain in WDS, and the EDR3 data back that up with good parallax overlap and only 226 AU separation.
14h 40m 30.40s +46° 32' 32.8" P.A. 254.00 sep 1.9 mag 8.86,10.57 Sp G0 dist. 103.41 pc (337.32 l.y.)

HO 59 AB: 508; 205x: Well separated faint B to bright white A.  Not physical
14h 41m 33.22s +44° 22' 40.7" P.A. 9.00 sep 6.8 mag 8.33,11.82 Sp G0 dist. 89.45 pc (291.79 l.y.)

STF1875 AB: 508; 205x: Near equal, well separated white stars.  Uncertain in WDS, and while the proper motions are similar there is no parallax overlap, so these are comoving not binary.
14h 43m 38.57s +37° 44' 58.4" P.A. 128.00 sep 3.1 mag 10.22,10.24 Sp F8 dist. 151.29 pc (493.51 l.y.)

KU 49 AB: 508; 445x: A bit hazy, but suspected elongated at 205x, split with 445x. Faint white stars, near equal, more than 1".  Uncertain in WDS but pretty good parallax overlap
14h 44m 25.17s +41° 24' 11.3" P.A. 206.00 sep 1.6 mag 10.57,11.03

STT 285 AB: 508: 445x: Nicely split white stars, 1 delta mag, noted the PA with drift.  Short period, 88.993-year period, it is at apastron and will hang there for the next decade.
14h 45m 29.74s +42° 22' 56.4" P.A. 74.70 sep 0.5 mag 7.75,8.66 Sp F6V dist. 83.82 pc (273.42 l.y.)

STT 287 AB: 508; 533x: An elongated smear at 205x, split with seeing at 445x, stead split at 533x.  <1", near equal white stars.  Binary with 340-year period, currently tightening to periastron around 2044.
14h 51m 27.53s +44° 55' 42.6" P.A. 4.20 sep 0.7 mag 8.40,8.62 Sp G0 dist. 59.14 pc (192.91 l.y.)

STF1896 AB: 508; 205x: White stars, 1 delta mag, wide.  Stelle Doppie gives AB as physical with a 4.23-year period, and an orbital plot -- but with separations of 0.02-0.04".  Checking the WDS notes, I find: "AB: Radial velocity variations, based on 10 years of monitoring, indicate the presence of a giant planet orbiting the B component, with P = 1544 +/- 34d, a = 2.62 +/- 0.04 au. M sin i = 1.49 +/- 0.09 Mjup.  The primary is an SB in an eccentric orbit with period 25-30 y; mass of Ab 0.5-0.6 Msun. No companions were detected by AO imaging."  So it seems SD is giving the orbit of the giant planet!  Full paper here.

14h 58m 21.57s +44° 02' 35.9" P.A. 276.00 sep 4.1 mag 8.97,9.47 Sp F8 dist. 96.06 pc (313.35 l.y.)