BU 1105 AB: 508; 667x: I see the slightest bump on side of A, very much fainter. I disabled tracking to record my impression of the position angle, which I had to the ESE, and find this is correct. With seeing, and using the apodising mask and seeing. WDS is uncertain whether it is binary, but there are only 6 observations. In the Pleiades, Burnham discovered with the 36-inch at 0.3" and described it as a "difficult pair."
03h 48m 34.80s +24° 10' 52.2" P.A. 114.00 sep 0.2 mag 9.30,10.40 Sp F4V
BU 1179 AB: 508; 333x: 34 Per. B is the faintest, smallest dot separated from bright white A, extremely fine. Burnham discovered with the 36-inch at 0.7" and described it as a "difficult pair."
03h 29m 22.05s +49° 30' 32.2" P.A. 141.00 sep 0.6 mag 4.72,7.34 Sp B3V dist. 165.29 pc (539.18 l.y.)
BU 1294 AB: 508; 205x: A is red-orange, B widely separated & light blue color, ~1 delta mag, 9th and 10th magnitudes. Not physical. Burnham discovered with the 40-inch, and said "The components are red and green."
03h 20m 40.58s +46° 40' 47.5" P.A. 240.00 sep 8.7 mag 9.66,10.28 Sp A2
BU 87 AB: 203; 205x: Very fine bright light orange A star and a much fainter B star just separated. Best seen with the 8-inch mask which shows nice Airy disks, orange A and light blue B. Binarity uncertain with 38 measures. Burnham discovered with 6-inch and noted: "A fine colored pair, golden:blue"
04h 22m 22.74s +20° 49' 16.4" P.A. 167.00 sep 1.9 mag 6.21,8.60 Sp B3V+K3II dist. 714.29 pc (2330.01 l.y.)
HU 1080 AB: 508; 533x: Used 533x & 667x. I could detect elongation at 533x, and significant notching with 667x, enough to tell which was A & B and the position angle, which I put at nearly E-W (B is tightly WSW currently). Physical with a 40.752-year period, it is widening and reaches apastron in 2029, so maybe I'll get a clean split and a more accurate PA estimate at that time.
BU 1294 AB: 508; 205x: A is red-orange, B widely separated & light blue color, ~1 delta mag, 9th and 10th magnitudes. Not physical. Burnham discovered with the 40-inch, and said "The components are red and green."
03h 20m 40.58s +46° 40' 47.5" P.A. 240.00 sep 8.7 mag 9.66,10.28 Sp A2
BU 87 AB: 203; 205x: Very fine bright light orange A star and a much fainter B star just separated. Best seen with the 8-inch mask which shows nice Airy disks, orange A and light blue B. Binarity uncertain with 38 measures. Burnham discovered with 6-inch and noted: "A fine colored pair, golden:blue"
04h 22m 22.74s +20° 49' 16.4" P.A. 167.00 sep 1.9 mag 6.21,8.60 Sp B3V+K3II dist. 714.29 pc (2330.01 l.y.)
HU 1080 AB: 508; 533x: Used 533x & 667x. I could detect elongation at 533x, and significant notching with 667x, enough to tell which was A & B and the position angle, which I put at nearly E-W (B is tightly WSW currently). Physical with a 40.752-year period, it is widening and reaches apastron in 2029, so maybe I'll get a clean split and a more accurate PA estimate at that time.
04h 28m 59.78s +16° 09' 32.7" P.A. 262.30 sep 0.3 mag 6.85,8.38 Sp F7V dist. 48.43 pc (157.98 l.y.)
STF 383 AB: 203; 205x: Wide, >1 delta mag, light orange A and almost blue B
03h 24m 14.32s +17° 32' 58.5" P.A. 121.00 sep 5.5 mag 8.48,9.12 Sp G5 dist. 105.37 pc (343.72 l.y.)
STF 403 AB: 203; 205x: Only a slight but noticeable magnitude difference, fairly tight separation ~3", white stars.
03h 31m 13.43s +19° 47' 00.3" P.A. 173.00 sep 2.3 mag 8.71,8.92 Sp F8 dist. 107.53 pc (350.76 l.y.)
STF 401 AB: 203; 205x: Slight magnitude difference, brilliant white stars, with another slightly fainter and much wider pair in the field (this is SHY 445 BC). Physical.
03h 31m 20.76s +27° 34' 18.5" P.A. 270.00 sep 11.5 mag 6.58,6.93 Sp A2V dist. 97.47 pc (317.95 l.y.)
HO 14 AB: 203; 205x: Very fine pair, half delta mag, ~2", faint but still direct vision
03h 33m 14.30s +28° 16' 30.9" P.A. 26.00 sep 2.2 mag 9.70,10.04 Sp A
STF 383 AB: 203; 205x: Wide, >1 delta mag, light orange A and almost blue B
03h 24m 14.32s +17° 32' 58.5" P.A. 121.00 sep 5.5 mag 8.48,9.12 Sp G5 dist. 105.37 pc (343.72 l.y.)
STF 403 AB: 203; 205x: Only a slight but noticeable magnitude difference, fairly tight separation ~3", white stars.
03h 31m 13.43s +19° 47' 00.3" P.A. 173.00 sep 2.3 mag 8.71,8.92 Sp F8 dist. 107.53 pc (350.76 l.y.)
STF 401 AB: 203; 205x: Slight magnitude difference, brilliant white stars, with another slightly fainter and much wider pair in the field (this is SHY 445 BC). Physical.
03h 31m 20.76s +27° 34' 18.5" P.A. 270.00 sep 11.5 mag 6.58,6.93 Sp A2V dist. 97.47 pc (317.95 l.y.)
HO 14 AB: 203; 205x: Very fine pair, half delta mag, ~2", faint but still direct vision
03h 33m 14.30s +28° 16' 30.9" P.A. 26.00 sep 2.2 mag 9.70,10.04 Sp A
STF 412 AB: 508; 333x: Exciting 2+1 set. AB is brilliant near equal white, nice close split <1". C is a much fainter wider star. I also cleanly split AB with the 8-inch mask, but the dark gap was narrower. Physical with a 522.16-year period.
03h 34m 26.62s +24° 27' 52.1" P.A. 350.10 sep 0.8 mag 6.60,6.86 Sp A3V+A3V dist. 131.58 pc (429.21 l.y.)
STF 415 AB: 203; 333x: Very wide B, faint pair, almost 2 delta mag.
03h 35m 20.40s +26° 51' 00.7" P.A. 53.00 sep 15.1 mag 8.75,10.88 Sp F5 dist. 171.23 pc (558.55 l.y.)
A 2420 AB: 203; 333x: Very fine because of its faintness. ~1 delta mag, ~2". I'm surprised I could get it, the clean disks and contrast of the mask helps.
03h 38m 25.78s +17° 35' 57.2" P.A. 268.00 sep 2.0 mag 9.32,10.19 Sp A5 dist. 51.36 pc (167.54 l.y.)
STF 424 AB: 203; 333x: Transparency hurting the view, but I can still see the faint pair, wide, ~1 delta mag. Physical.
03h 39m 10.83s +27° 57' 23.3" P.A. 313.00 sep 10.1 mag 8.87,11.46 Sp A0 dist. 212.77 pc (694.06 l.y.)
STF 427 AB: 203; 333x: Nice airy disks, slightly blue-white, wide, ~1 delta mag. Physical.
03h 40m 38.77s +28° 46' 24.0" P.A. 207.00 sep 7.0 mag 7.41,7.84 Sp A1V+A2V dist. 113.12 pc (369 l.y.)
A 987 AB: 203; 333x: Exceptionally fine pair, faint, significant delta mag, ~1"
03h 42m 27.88s +29° 45' 50.4" P.A. 190.00 sep 1.1 mag 10.21,10.39 Sp F8
STF 435 AB: 203; 333x: Very wide, >1 delta mag. Physical
03h 43m 06.52s +25° 40' 52.9" P.A. 3.00 sep 13.2 mag 7.20,8.87 Sp F3V
A 989 AB: 203; 333x: Faint but easy pair, near equal, ~3"
03h 43m 27.49s +29° 35' 35.4" P.A. 357.00 sep 3.2 mag 9.85,10.39
STF 444 AB: 203; 333x: Very pretty unequal pair, A is blue-white and B a little red, wide. Physical
03h 45m 48.82s +23° 08' 49.7" P.A. 338.00 sep 3.4 mag 6.91,10.09 Sp A0V dist. 121.36 pc (395.88 l.y.)
BU 536 AB: 203; 333x: Wow what a great pair. B is a clean split ~1" right next to A, ~1 delta. More amazing to see than I can describe. Aitken had a measure of 0.15" in 1899.70. Burnham discovered with the 18.5-inch at 0.4" and notes "It is important that the close pair should be watched and measured in the near future." Physical, 885.64 year period, now widening.
STF 424 AB: 203; 333x: Transparency hurting the view, but I can still see the faint pair, wide, ~1 delta mag. Physical.
03h 39m 10.83s +27° 57' 23.3" P.A. 313.00 sep 10.1 mag 8.87,11.46 Sp A0 dist. 212.77 pc (694.06 l.y.)
STF 427 AB: 203; 333x: Nice airy disks, slightly blue-white, wide, ~1 delta mag. Physical.
03h 40m 38.77s +28° 46' 24.0" P.A. 207.00 sep 7.0 mag 7.41,7.84 Sp A1V+A2V dist. 113.12 pc (369 l.y.)
A 987 AB: 203; 333x: Exceptionally fine pair, faint, significant delta mag, ~1"
03h 42m 27.88s +29° 45' 50.4" P.A. 190.00 sep 1.1 mag 10.21,10.39 Sp F8
STF 435 AB: 203; 333x: Very wide, >1 delta mag. Physical
03h 43m 06.52s +25° 40' 52.9" P.A. 3.00 sep 13.2 mag 7.20,8.87 Sp F3V
A 989 AB: 203; 333x: Faint but easy pair, near equal, ~3"
03h 43m 27.49s +29° 35' 35.4" P.A. 357.00 sep 3.2 mag 9.85,10.39
STF 444 AB: 203; 333x: Very pretty unequal pair, A is blue-white and B a little red, wide. Physical
03h 45m 48.82s +23° 08' 49.7" P.A. 338.00 sep 3.4 mag 6.91,10.09 Sp A0V dist. 121.36 pc (395.88 l.y.)
BU 536 AB: 203; 333x: Wow what a great pair. B is a clean split ~1" right next to A, ~1 delta. More amazing to see than I can describe. Aitken had a measure of 0.15" in 1899.70. Burnham discovered with the 18.5-inch at 0.4" and notes "It is important that the close pair should be watched and measured in the near future." Physical, 885.64 year period, now widening.
03h 46m 16.00s +24° 11' 23.5" P.A. 178.80 sep 1.0 mag 8.13,9.39 Sp A7V
05h 41m 40.34s -02° 53' 47.3" P.A. 183.10 sep 0.7 mag 6.68,8.22 Sp A9IV-V dist. 80.71 pc (263.28 l.y.)
FOX 142 AB: 508; 205x: Attractive white star and ~3 delta mag light red B, ~6".
05h 42m 10.57s +13° 35' 30.7" P.A. 100.00 sep 5.9 mag 8.81,11.53 Sp A0 dist. 427.35 pc (1394.02 l.y.)
BU 1402 AB: 508; 205x: B just appears direct vision & brightens with averted, white A, nice small pair. Not physical. Discovered with the 40-inch at 9.5".
05h 47m 58.29s +12° 03' 55.9" P.A. 341.00 sep 10.8 mag 8.40,12.40 Sp F0
STF 797 AB: 508; 205x: Typical Struve, wide, two delta... nice pair
05h 48m 28.21s +04° 42' 14.0" P.A. 17.00 sep 7.3 mag 7.37,9.76 Sp A0 dist. 321.54 pc (1048.86 l.y.)
HU 40 AB: 508; 333x: Light orange A and two delta B, ~4" separation.
05h 51m 08.25s +20° 08' 21.5" P.A. 18.00 sep 3.8 mag 9.10,10.10 Sp K0
HU 448 AB: 508; 333x: Blue-white, nearly 1 delta, pretty well split
05h 51m 53.76s +20° 37' 07.7" P.A. 238.00 sep 2.5 mag 9.25,11.13
STF 813 AB: 508; 333x: Blue-white pair, near equal, ~4"
05h 54m 22.37s +18° 54' 01.6" P.A. 150.00 sep 3.1 mag 8.82,8.97 Sp A0 dist. 149.25 pc (486.85 l.y.)
BU 563 AB; 508; 333x: B is wide ~7", just visible with direct vision, brightens with averted.
05h 54m 37.44s +15° 30' 27.8" P.A. 186.00 sep 6.7 mag 8.01,11.10 Sp B9 dist. 281.69 pc (918.87 l.y.)
HO 20 AB: 508; 333x: B seen with direct vision, very faint, very large delta mag, both yellowish stars
05h 54m 55.20s +14° 13' 11.6" P.A. 279.00 sep 8.1 mag 6.75,11.80 Sp K0 dist. 218.82 pc (713.79 l.y.)
TDS3427 AB: 508; 333x: Wow! very fine, near equal faint pair, nicely split. I'm really surprised it wasn't discovered before since any one of the greats could have seen it -- I wonder if it is a physical binary and was at periastron 75-150 years ago, and only now coming to view? Three observations so far...
05h 55m 34.58s +18° 44' 56.8" P.A. 43.00 sep 1.3 mag 10.96,11.31
A 2439 AB: 508; 333x: ~1 delta mag, ~3", not difficult
05h 56m 49.63s +18° 22' 12.2" P.A. 146.00 sep 2.3 mag 9.28,10.60 Sp A0
HU 449 AB: 508; 333x: B revealed with averted vision, and I can hold it direct with foveal coaxing.
05h 56m 53.56s +21° 20' 35.1" P.A. 342.00 sep 3.1 mag 9.50,12.70 Sp F5
COU 376 AB: 508; 333x: Very faint, slightly unequal, most of the time an elongated smudge but resolve with seeing.
05h 58m 12.15s +20° 55' 22.3" P.A. 297.00 sep 0.8 mag 10.62,10.96 Sp A0
BU 894 AB: 508; 333x: Bright white A, B just appears with direct vision, brightens with averted, wide. Discovered with the 18.5-inch at 5.1", no change.
06h 16m 31.78s +19° 00' 47.5" P.A. 134.00 sep 5.1 mag 7.29,11.60 Sp F6V
HO 23 BC: 508; 333x: Excellent! BC is very delicate, very close to bright C, very faint and just appears with direct vision. Part of the widely separated S 509 AB.
06h 14m 14.70s +14° 26' 55.0" P.A. 245.00 sep 3.1 mag 8.04,11.52 Sp A5V dist. 152.67 pc (498.01 l.y.)
KUI 24 AB: 508; 667x: Bright white, olive shape is the best I can see. Physical with 260-year period, it will tighten to invisibility the next 15 years.
06h 14m 28.59s +17° 54' 22.8" P.A. 145.00 sep 0.2 mag 6.29,7.16 Sp A6m dist. 162.07 pc (528.67 l.y.)
KUI 24 AB: 508; 667x: Bright white, olive shape is the best I can see. Physical with 260-year period, it will tighten to invisibility the next 15 years.
06h 14m 28.59s +17° 54' 22.8" P.A. 145.00 sep 0.2 mag 6.29,7.16 Sp A6m dist. 162.07 pc (528.67 l.y.)
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