19 september 2021

I didn't pay attention to the weather and it turned out to be relatively clear.  Seeing was average.  All the same, I thought it would be better to get out and observe than sitting inside watching TV, so I uncovered the 6-inch and spent a bit more than an hour out.

STF 2968 AB: 152; 175x: White A and blue B, 3 delta mag, close split.  WDS uncertain, there is 8% parallax range overlap, 565 AU weighted separation, and stellar mass of 2.75/1.52, so may be gravitational.

23h 00m 42.41s +31° 04' 58.7" P.A. 93.00 sep 3.2 mag 6.69,9.48 Sp B9pMn dist. 135.5 pc (442 l.y.)

BU 78 AB: 152; 175x: White A and fairly wide B which appears brightly but only with averted vision.  WDS calls it physical, and there is 47% parallax range overlap, 2,179 AU weighted separation, and stellar mass 1.89/0.82, so might be.  Burnham discovered in 1872 with his 6-inch at 10" separation, so it has changed considerably.

23h 07m 55.22s +31° 27' 31.7" P.A. 54.00 sep 18.4 mag 7.47,11.09 Sp A5V dist. 92.25 pc (300.92 l.y.)

HJ 5532 AB-C: 152; 175x: White A and very wide, 2 delta mag B.  I did not notice that A is BU 385, 0.7" 7.44/8.23.  WDS calls the HJ physical, however their parallax ranges do not overlap.

23h 10m 17.15s +32° 29' 13.4" P.A. 77.00 sep 57.9 mag 7.10,9.43 Sp B9V dist. 327.87 pc (1069.51 l.y.)

STF 2978 AB: 152; 175x: Ice blue A and ruddy, 2 delta mag, wide B.  WDS says physical, and there is 10% parallax overlap, 1,156 AU weighted separation, and stellar mass 2.63/1.85. 

23h 07m 27.73s +32° 49' 31.3" P.A. 145.00 sep 8.3 mag 6.35,7.46 Sp A3V dist. 163.4 pc (533.01 l.y.)

STF 2974 AB: 152; 175x: Lovely near equal blue-white stars, just split.  WDS says uncertain, but there is very strong 95% parallax range overlap, 673 AU weighted separation, and 2.39/2.21, so very likely gravitational.

23h 05m 01.12s +33° 23' 08.0" P.A. 168.00 sep 2.7 mag 8.07,8.46 Sp A0V+A3V dist. 244.5 pc (797.56 l.y.)

BU 720 AB: 152; 175x: Light orange, probably elongated, but seeing is too poor to resolve.  Physical with a 492 year period.  Spectral class K4IIIb (yellow-orange)

23h 33m 57.19s +31° 19' 31.0" P.A. 107.70 sep 0.6 mag 5.67,6.11 Sp K4IIIb dist. 168.35 pc (549.16 l.y.)

STF 3018 AB-C: 152; 175x: Light orange stars, 1 delta mag, wide.  Spectral class F7V (yellow-white).  AB is BU 1266, 0.2" 8.35/8.14.  WDS says proper motion indicates physical, and unfortunately there is no parallax data for the primary.

23h 30m 26.29s +30° 49' 54.6" P.A. 202.00 sep 18.8 mag 7.43,9.75 Sp F7V dist. 68.07 pc (222.04 l.y.)

BU 858 AB: 152; 175x: White star, not round.  Physical with a 779-year period, but no data for the secondary.  Burnham discovered at 1.1" with the 18.5-inch Dearborn refractor and said: "A more difficult pair than the distance and magnitude would indicate."  

23h 41m 17.56s +32° 33' 39.9" P.A. 219.50 sep 0.8 mag 7.81,8.78 Sp A1V dist. 208.33 pc (679.57 l.y.)

STF 3058 AB: 152; 175x: Wide 1 delta mag.  WDS says physical, however the data says otherwise.  4% parallax range overlap, 1,899 AU weighted separation, 2.01/1.39 stellar mass, but its radial velocity delta exceeds the escape velocity, so it won't be gravitationally bound.

00h 05m 09.24s +30° 19' 44.5" P.A. 51.00 sep 12.6 mag 7.81,9.21 Sp F3V+F6V dist. 253.16 pc (825.81 l.y.)

STF 24 AB: 152; 175x: Clean split, near equal, yellow-white stars.  WDS says physical, however their parallax ranges do not overlap -22%.

00h 18m 30.59s +26° 08' 25.1" P.A. 247.00 sep 5.0 mag 7.79,8.44 Sp A2 dist. 154.8 pc (504.96 l.y.)

STF 28 AB: 152; 175x: Wide, slight mag difference.  WDS says physical, but their parallax ranges do not overlap (-68%).

00h 23m 53.23s +29° 30' 09.1" P.A. 224.00 sep 33.0 mag 8.32,8.55 Sp F7V+F8V dist. 84.6 pc (275.97 l.y.)

AC 1 AB: 152; 175x: Around half a delta mag, nice and close split.  Physical with a 525-year period.  At apastron.

00h 20m 54.10s +32° 58' 40.9" P.A. 288.90 sep 1.9 mag 7.27,8.26 Sp F5V dist. 67.93 pc (221.59 l.y.)

STT 11 AB: 152; 175x: Wide, near equal finder split.  WDS says physical, but they are not: the parallax ranges do not overlap -15%, 29,447 AU weighted separation, 2.14/2.08 stellar mass.

00h 30m 39.88s +32° 08' 11.4" P.A. 317.00 sep 197.6 mag 7.57,7.70 Sp F2 dist. 159.49 pc (520.26 l.y.)

HJ 5451 AB: 152; 175x: Orange star, wide 1 delta mag B.  Spectral class K1III (yellow-orange).  WDS says physical, however their parallax ranges do not overlap, -13%.

00h 31m 25.64s +33° 34' 53.9" P.A. 86.00 sep 55.3 mag 6.01,9.34 Sp K1III dist. 116.14 pc (378.85 l.y.)

STF 19 AB: 152; 175x: Exceptional!  White A, B is very faint and only 1" separated, seen direct vision but just barely.  WDS uncertain, but there is 44% parallax overlap, only 312 AU weighted separation, and 2.15/1.29 stellar mass.

00h 16m 43.02s +36° 37' 47.4" P.A. 141.00 sep 2.4 mag 7.12,9.48 Sp A2V dist. 126.42 pc (412.38 l.y.)