30 september 2021

Seeing was forecast to be average, and in any case I was too late to open up the 20-inch for it to cool properly, so the 6-inch it was.  Beautiful star images, as typical.  

STF 2986 AB: 152; 175x: Red A and around 3 delta mag B, no other stars in the field.  CDSA notes say "Local solar type double; very dark field.  AB: ps = 1,070 AU."  WDS notes say "Proper motion indicates physical, parallax indicates non-physical."  In reality there is 46% parallax range overlap, it's only 789 AU weighted separation, and 1.10/0.52 solar mass.  BUT there difference in radial velocity (16.02) far exceeds the escape velocity of the system (1.91) -- and this is the reason they are not gravitational.

23h 09m 57.10s +14° 25' 35.6" P.A. 270.00 sep 31.4 mag 6.61,8.88 Sp G0V dist. 24.83 pc (81 l.y.)

STT 483 AB: 152; 175x: 52 Peg.  Very slightly out of round, not notched, weaker at one end.  254-year period.

22h 59m 11.82s +11° 43' 43.8" P.A. 31.70 sep 0.5 mag 6.11,7.27 Sp A8III dist. 94.34 pc (307.74 l.y.)

STF 2958 AB: 152;175x: White A and very faint blue, closely split around 3", nice.  WDS says physical, and there is 10% parallax range overlap, 341 AU weighted separation, 1.96/1.08 solar mass.
22h 56m 51.47s +11° 50' 54.0" P.A. 15.00 sep 4.0 mag 6.63,9.09 Sp A3Vs dist. 98.81 pc (322.32 l.y.)

STTA 241 AB: 152; 175x: Wide, faint, near equal.  WDS says physical, but there is no overlap in their parallax ranges (-84%), and they are fairly distant 8,944 AU weighted separation, 1.57/1.45 solar mass.  

22h 58m 33.60s +12° 03' 04.4" P.A. 160.00 sep 84.9 mag 8.28,8.37 Sp F2 dist. 111.48 pc (363.65 l.y.)

HO 296 AB: 152; 175x: Subtly out of round, no notch, very slightly weaker on one side.  20.83-year period, it is tightening.  

22h 40m 52.71s +14° 32' 57.5" P.A. 27.10 sep 0.3 mag 6.14,7.22 Sp G4V dist. 33.8 pc (110.26 l.y.)

BU 701 AB: 152; 380x: No resolution at all powers up to seeing limit at 380x.  554-year period, Burnham discovered with the 18.5-inch Dearborn, and noted "The companion is evidently moving with it."  Unfortunately no parallax data in EDR3.
22h 28m 07.24s +12° 14' 55.5" P.A. 174.70 sep 1.0 mag 7.34,9.62 Sp K0V dist. 66.4 pc (216.6 l.y.)

STF 2869 AB: 152; 175x: Light yellow A, B seen with averted vision at first then held direct, wide.  WDS says physical, but there is no parallax range overlap (-78%).
22h 10m 22.02s +14° 37' 47.7" P.A. 254.00 sep 20.8 mag 6.33,12.40 Sp K0III dist. 135.69 pc (442.62 l.y.)

STF 2854 AB: 152; 175x: Nice!  Very fine near equal blue-white stars.  WDS uncertain, but they are likely gravitational with 45% parallax range overlap, 130 AU weighted separation, 1.42/1.37 solar mass.  

22h 04m 22.52s +13° 38' 53.4" P.A. 84.00 sep 1.6 mag 7.77,7.89 Sp F6V dist. 72.1 pc (235.19 l.y.)

STF 2908 AB: 152; 175x: White A and 1 delta mag, rather wide B.  WDS uncertain, and they might be gravitational, 4% parallax range overlap, 2,139 AU weighted separation, 2.72/1.66 solar mass.

22h 28m 11.55s +17° 15' 47.9" P.A. 114.00 sep 9.0 mag 7.74,9.68 Sp G9III dist. 462.96 pc (1510.18 l.y.)

COU 240 AB: 152; 285x: Very unequal snowman at 285x, seeing did not support higher powers.  WDS uncertain, and the primary lacks data in EDR3.

22h 56m 23.71s +22° 57' 21.2" P.A. 289.00 sep 0.8 mag 7.73,8.82 Sp F0 dist. 185.53 pc (605.2 l.y.)

HO 482 AB: 152; 285x: Notched elongation, blue-green stars.  383-year period, missing data in EDR3.

22h 51m 26.66s +26° 23' 27.9" P.A. 13.60 sep 0.6 mag 7.34,8.29 Sp A9V dist. 132.63 pc (432.64 l.y.)

STF 2952 AB: 152; 175x: Wide light yellow A and blue B, 2 delta mag.  WDS says physical, but there is no overlap in parallax range (-17%).  Otherwise, there is a moderate 1,191 AU weighted separation and 1.38/0.73 solar mass, and the radial velocity difference (0.39) is less than the escape velocity (1.77) -- only time will tell if this resolves into an orbit.
22h 54m 11.41s +28° 00' 59.8" P.A. 139.00 sep 17.6 mag 7.74,10.47 Sp F8V dist. 50.84 pc (165.84 l.y.)

BU 396 AB: 152; 285x: Doubtful.  I see a glint in the first diffraction but it did not firm up.  Discovered with 6-inch at 1.2".  Lack of data for the secondary in EDR3. 

01h 03m 37.01s +61° 04' 29.4" P.A. 67.00 sep 1.3 mag 6.06,8.62 Sp F0II dist. 613.5 pc (2001.24 l.y.)

BU 258 AB: 152; 175x: Very fine, 2 delta mag, just split.  WDS uncertain, Burnham discovered with his 6-inch at 0.8"!  Sadly there is no parallax range overlap (-72%).

01h 13m 09.82s +61° 42' 22.3" P.A. 263.00 sep 1.6 mag 6.50,8.80 Sp B9V dist. 201.61 pc (657.65 l.y.)

ARY 8 AB: 152; 175x: Wide trio of near equal mag stars.  AB and AC are physical per WDS.  Per EDR3, AB has 44% shared parallax ranges, but a very wide 16,943 AU weighted separation, 3.12/2.75 solar mass, so time will need to tell.  I do not find data on C.  I did not notice AC the Burnham pair, which has a low catalog number indicating 6-inch era discovery, but the year is 1889 which puts it at the Lick 36-inch, discovery separation 0.4".

AB: 00h 10m 37.25s +58° 44' 53.6" P.A. 101.00 sep 39.2 mag 8.13,8.63 Sp B3IV

AC: 00h 10m 37.25s +58° 44' 53.6" P.A. 43.00 sep 104.7 mag 8.13,8.29 Sp B7V

BU 485 Ca-Cb: 00h 10m 46.36s +58° 46' 10.2" P.A. 257.00 sep 0.1 mag 8.77,9.50 Sp B7V dist. 591.72 pc (1930.19 l.y.)

STF 3062 & STF 3057: 152; 175x: A nice double-double, one is near equal and closely split, the other is 2 delta mag, rather wide, yellow.  STF 3062 is a short 106.7-year period pair (which I did not sketch!) now coming off apastron and which will tighten and make a quarter turn by the 2040s.  STF 3057 is uncertain, but the chances are they are physical, with 79% parallax range overlap, 1,650 AU weighted separation, 4.33/2.29 solar mass.

STF 3062: 00h 06m 15.81s +58° 26' 12.5" P.A. 7.10 sep 1.5 mag 6.42,7.32 Sp G3V dist. 21.48 pc (70.07 l.y.)

STF 3057: 00h 04m 54.98s +58° 31' 55.8" P.A. 298.00 sep 3.9 mag 6.70,9.30 Sp B3V dist. 840.34 pc (2741.19 l.y.)

STF 7 AB: 152; 175x: Surprise!  Very fine white stars, <1 delta mag, very closely split.  WDS is uncertain, but there is 86% overlap of parallax ranges, only 546 AU weighted separation, 3.14/2.78 solar mass, so likely gravitational.
00h 11m 38.91s +55° 57' 40.9" P.A. 210.00 sep 1.3 mag 7.99,8.46 Sp B8V dist. 598.8 pc (1953.29 l.y.)

STF 3049 AB: 152; 175x: Cream white A and light yellow, 2 delta mag B, well split.  WDS is uncertain, but there is no parallax range overlap (-12%).

23h 59m 00.53s +55° 45' 17.8" P.A. 326.00 sep 3.1 mag 4.99,7.24 Sp B1V dist. 1388.89 pc (4530.56 l.y.)

MRI 31 AB: 152; 175x: Very wide pair, slightly unequal, reddish color.  The B star has two close 12th magnitude companions

00h 34m 35.58s +62° 35' 25.7" P.A. 9.00 sep 115.4 mag 8.12,9.01 Sp F7V+F8V dist. 63.01 pc (205.54 l.y.)

STF 10 AB: 152; 175x: Wide near equal.  WDS says physical, but there is no overlap of parallax ranges (-32%).

00h 14m 49.33s +62° 50' 25.5" P.A. 176.00 sep 17.6 mag 8.04,8.55 Sp A2V