Seeing was predicted to be good after 10pm with good transparency throughout, so I opened up the 20-inch. I adjusted the clock setting on the Argo and was able to make a wider spread of alignment stars, and this seemed to help pointing accuracy for the night. It was cold, into the upper 30s, but I was dressed for it. No significant dew but the sky transparency was hurt by the haze which builds up in the Bay during such conditions. I masked down to 7-inches to start and knocked off more from the Struve list. After 10:20pm I thought seeing might be slightly improved, so I tried some stars off the 6th Orbital Catalog list, with a couple short periods observed. A good night with a lot of observations.
STF 749 AB: 178; 250x: Very nice near equal pair, elongated at lower powers nicely split with 250x. Amazingly there is no parallax range overlap, -19%, so in spite of the mere 212 AU weighted separation, 2.9+2.9 Msol, it might not be binary. SD gives a grade 4 orbit with a 773-year period.
05h 37m 08.84s +26° 55' 28.3" P.A. 317.50 sep 1.1 mag 6.54,6.55 Sp B9IV-V dist. 154.8 pc (504.96 l.y.)
STF 779 AB: 178; 140x: 1 Dm, fairly wide white stars. No parallax overlap, -39%, they are not binary.
05h 44m 21.16s +27° 43' 53.3" P.A. 254.00 sep 8.6 mag 7.50,9.78 Sp A0 dist. 271.74 pc (886.42 l.y.)
STF 805 AB: 178; 140x: Very slight delta mag, wide, the secondary star is light orange. There is 59% parallax range overlap, 6,971 AU weighted separation, 3.4+2.9 Msol, so there is some possibility these are binary. SD says proper motion indicates not physical, but this could be just the direction of the orbit.
05h 51m 48.20s +28° 26' 59.6" P.A. 50.00 sep 12.1 mag 8.41,8.87 Sp A2
STF 785 AB: 178; 140x: Slight delta, wide. There is no parallax range overlap, -69%, it is not binary.
05h 45m 55.39s +25° 54' 49.3" P.A. 347.00 sep 14.7 mag 7.27,8.32 Sp B9
STF 776 AB: 178; 140x: Fine split, 1 Dm. There is 42% overlap of the parallax ranges, only 425 AU weighted separation, 1.7+1.4 Msol, so there is a chance this is binary and an orbit should be tried.
05h 43m 03.19s +25° 21' 47.8" P.A. 97.00 sep 2.7 mag 8.51,9.78 Sp A0 dist. 122.25 pc (398.78 l.y.)
STF 716 AB: 178; 140x: Bright stars, more than half delta magnitude, closely split. There is no overlap of the parallax ranges, -48%, these are not binary.
05h 29m 16.49s +25° 09' 01.1" P.A. 209.00 sep 4.6 mag 5.83,6.68 Sp B8.5V+A0V dist. 130.38 pc (425.3 l.y.)
STF 694 AB: 178; 250x: Very finely split with low powers, best seein with 250x, about 1 Dm. No other stars in the field! No parallax range overlap, -17%, sadly these are not likely to be binary.
05h 24m 01.17s +24° 57' 37.8" P.A. 13.00 sep 1.3 mag 8.65,8.54 Sp A2 dist. 114.16 pc (372.39 l.y.)
STF 686 AB: 178; 250x: Near equal, wide. There is 74% overlap of the parallax ranges, 1,070 AU weighted separation, 1.3+1.2 Msol, and the radial velocity delta 0.2 is less than the escape velocity 2.0, so these are likely binary and an orbit should be tried.
05h 20m 56.18s +24° 02' 13.7" P.A. 226.00 sep 9.3 mag 9.21,9.40 Sp F2
STF 755 AB: 178; 250x: Slight delta, well split, pretty orange star in view to the northeast. There is no overlap of the parallax ranges, -44%, so these are not likely binary.
05h 39m 09.17s +23° 17' 17.7" P.A. 318.00 sep 6.2 mag 8.88,9.50 Sp F8
STF 777 AB: 178; 140x: Faint pair, near equal, wide. An unremarkable pair, but it turns out there is 62% overlap of the parallax ranges, 1,862 AU weighted separation, 2.3+2.1 Msol, and the radial velocity delta 0.3 is less than the escape velocity 2.0, so it is likely binary and an orbit should be tried.
05h 43m 20.78s +22° 12' 45.7" P.A. 84.00 sep 4.7 mag 9.35,9.75 Sp A0
STF 742 AB: 178; 140x: 1 Dm, well split, light orange stars. There is no overlap of the parallax ranges, -17%, so in spite of the other data being good, 310 AU weighted separation, 1.6+1.4 Msol, 0.5 radial velocity delta vs. 4.1 escape velocity, this may not be binary. SD is giving a grade 5 orbit of 2959-years.
05h 36m 26.38s +21° 59' 35.1" P.A. 276.20 sep 4.2 mag 7.09,7.47 Sp F8 dist. 67.43 pc (219.96 l.y.)
STF 772 AB-C: 178; 140x: Wide, near equal stars. There is no Gaia parallax data for the primary star. AB is A 2110, 0.5" 9.6/9.7, which I did not try for because of the mediocre seeing.
05h 42m 05.81s +21° 34' 49.0" P.A. 243.00 sep 30.6 mag 8.88,9.65 Sp A0
STF 787 AB: 178; 550x: Hairline split only with high power and 7-inches. The split was easy using 20-inch. Gaia data shows there is no overlap of the parallax ranges, -47%, in spite of the mere 96 AU weighted separation, 1.5+1.6 Msol, these might not be binary. SD is giving a grade 5 orbit of 920-years.
05h 46m 00.80s +21° 19' 04.5" P.A. 53.10 sep 0.7 mag 8.27,8.81 Sp F2 dist. 157.73 pc (514.52 l.y.)
STF 740 AB: 178; 140x: Unequal pair, wide separation. There is no overlap of the parallax ranges, -89%, it is not binary.
05h 36m 23.02s +21° 11' 11.4" P.A. 122.00 sep 21.7 mag 9.01,9.93 Sp B2:III:pe
STF 786 AB: 178; 140x: Fairly faint pair, 1 Dm, well separated. There is 5% parallax range overlap, 1,925 AU weighted separation, 2.8+1.5 Msol, but the radial velocity delta 2.8 exceeds the escape velocity 2.0, this is not likely to be binary.
05h 45m 59.50s +20° 14' 59.6" P.A. 336.00 sep 6.5 mag 8.24,11.30 Sp K0
STF 771 AB: 178; 140x: Near equal, wide, faint stars. There is no overlap of the parallax ranges, it is not binary.
05h 41m 44.85s +19° 32' 32.2" P.A. 55.00 sep 21.7 mag 10.27,10.17
STF 770 AB: 178; 250x: Difficut pair, faint B appears with seeing only, 1" separation, 1 Dm. There is 51% overlap of the parallax ranges, only 566 AU weighted separation, 3.0+2.3 Msol, so this is likely binary and needs an orbit.
05h 41m 34.67s +19° 13' 13.7" P.A. 330.00 sep 1.1 mag 8.76,9.77 Sp A0
STF 806 AC: 178; 140x: Very slightly unequal wide, white, stars, seems to be in front of a very faint open cluster. There is 15% parallax range overlap, 9,929 AU weighted separation, 3.1+3.1 Msol. While there is some chance these are binary it's more likely they're not. Did not notice J677 AB, 10.0/10.8 1.9", but I should have. But this also is not binary, -23% overlap of the parallax ranges.
05h 51m 06.47s +17° 53' 31.8" P.A. 201.00 sep 11.1 mag 10.09,10.05
STF 759 AB: 178; 140x: 1 Dm, wide. There is -93% overlap of the parallax ranges, it is not binary.
05h 38m 47.57s +17° 45' 01.9" P.A. 326.00 sep 29.3 mag 9.09,9.94 Sp A0
STF767 AB = BU1401 AB: 178; 140x: 1 Dm, wide. No overlap of the parallax ranges, -86%, it is not binary.
05h 47m 31.96s +17° 37' 09.5" P.A. 170.00 sep 15.2 mag 9.85,11.14 Sp A0
STF 730 AB: 178; 140x: Near equal bright white stars, wide. There is no overlap of the parallax ranges, -23%, it is not binary.
05h 32m 14.14s +17° 03' 29.3" P.A. 142.00 sep 9.7 mag 6.06,6.44 Sp B7IIIe dist. 917.43 pc (2992.66 l.y.)
STF 733 AB: 178; 140x: Slightly unequal white pair, wide. There is 53% parallax range overlap, 4,198 AU weighted separation, 1.8+1.7 Msol, and the radial velocity delta 0.3 is less than the escape velocity 1.2, so surprisingly this is probably binary and needs an orbit.
05h 33m 28.27s +16° 00' 52.9" P.A. 41.00 sep 12.4 mag 9.84,10.39 Sp A0
STF858 = STF 855 5.7/6.7 29"
STF 855 AB: 178; 140x: Wide one delta bright stars. There is 61% parallax range overlap, 5,194 AU weighted separation, 3.5+2.6 Msol, and the radial velocity delta 1.3 is just below the escape velocity 1.4, so it is possibly binary and needs an orbit.
06h 08m 57.90s +02° 29' 58.9" P.A. 115.00 sep 29.1 mag 5.68,6.68 Sp A3Vn+A0V dist. 200.8 pc (655.01 l.y.)
STF 846 AB: 178; 140x: Faint stars, 2 Dm, wide. There is no overlap of the parallax ranges, -12%, and the radial velocity 1.7 exceeds the escape velocity 1.4, so this is not likely binary.
06h 07m 24.76s +02° 08' 31.6" P.A. 138.00 sep 12.9 mag 8.60,10.81 Sp A5 dist. 289.02 pc (942.78 l.y.)
STF 838 AB: 178; 140x: Very wide, 1 Dm pair. There is no overlap of the parallax ranges, -93%, it is not binary.
06h 05m 08.57s +00° 51' 59.4" P.A. 329.00 sep 40.5 mag 7.13,10.38 Sp G3II dist. 387.6 pc (1264.35 l.y.)
STF 847 AB: 178; 140x: Wide near equal pair. There is no parallax range overlap, -38%, it is not binary.
06h 07m 09.93s +00° 19' 40.0" P.A. 262.00 sep 24.3 mag 9.23,9.89 Sp K0
STF 827 AB: 178; 140x: Very wide, 1 Dm, B is faint and just direct vision. There is no overlap of the parallax ranges, -61%, it is not binary.
06h 00m 07.83s -00° 30' 06.4" P.A. 218.00 sep 26.7 mag 7.87,11.35 Sp B9V
STF 871 AB: 178' 140x: Equal magnitude, well separated, white. There is 48% overlap of the parallax ranges, 3,812 AU weighted separation, 2.9+2.6 Msol, so this might be binary and an orbit should be tried.
06h 11m 33.86s -00° 46' 01.6" P.A. 307.00 sep 7.3 mag 8.84,9.38 Sp A0
STF 873 AB: 178; 140x: Faint, slightly unequal, well separated. There is no overlap of the parallax ranges, -93%, it is not binary.
06h 12m 37.71s -01° 18' 07.6" P.A. 294.00 sep 8.6 mag 9.87,10.42 Sp G
STF 836 AB: 178; 250x: Very difficult, very faint B appears with seeing within A's diffraction 2 Dm. Surprisingly there is no parallax range overlap, -21%, it is not likely binary.
06h 02m 30.98s -02° 21' 39.8" P.A. 24.00 sep 2.0 mag 8.57,10.08 Sp A0
STF 839 AB: 178; 140x: Faint near equal pair, well separated. There is no overlap of the parallax ranges, -22%, it is not binary.
06h 04m 52.99s -02° 43' 02.0" P.A. 289.00 sep 5.1 mag 9.72,10.07 Sp A0
STF 874 AB: 178; 140x: 1 Dm, wide. There is no overlap of the parallax ranges, -98%, it is not binary.
06h 12m 35.15s -03° 42' 47.8" P.A. 339.00 sep 15.6 mag 8.48,11.00 Sp G
STF 850 AB: 178; 250x: Nice close pair, 2" separated, seen well with high power, 1 Dm. There is no overlap of the parallax ranges, however, -57%, it is not binary.
06h 07m 22.05s -03° 59' 38.6" P.A. 15.00 sep 2.2 mag 9.05,9.96 Sp F2
STF 851 AB: 178; 140x: Pretty pair, near equal white stars closely separated. There is 62% parallax range overlap, only 770 AU weighted separation, 2.1+1.8 Msol, so these are possibly binary and an orbit should be tried.
06h 08m 04.43s +03° 17' 23.7" P.A. 34.00 sep 2.9 mag 8.88,9.47 Sp A0
STF 837 AB: 178; 140x: Wide, 1 Dm. There is no overlap of the parallax ranges, -68%, it is not binary.
06h 03m 38.86s +04° 18' 50.3" P.A. 226.00 sep 19.6 mag 8.05,10.60 Sp A0
STT 182 AB: 508; 285x: White stars, near equal, nice close split. There is -6% parallax range overlap, not a good sign, only 156 AU weighted separation, 2.0+2.0 Msol, so there seems not much chance this is binary. SD is giving a grade 4 orbit 1661-year period.
07h 52m 42.12s +03° 23' 02.2" P.A. 7.90 sep 0.9 mag 7.82,7.93 Sp A2 dist. 210.08 pc (685.28 l.y.)
STF1175 AB: 508; 140x: Easy split, 2 Dm. There is 99% overlap of the parallax ranges with 0% error, quite a remarkable result. 58 AU weighted separation, 0.8+1.1 Msol, it is probably binary. SD showing a grade 4 orbit, 2929-year period which won't make any change these coming decades.
08h 02m 26.06s +04° 09' 07.5" P.A. 288.70 sep 1.4 mag 7.89,9.13 Sp G5 dist. 40.55 pc (132.27 l.y.)
BU 581 AB: 508; 571x: In choppy seeing, a clean split when it stills, PA southwest, faint C a little wider in a similar PA. There is no parallax data for the primary. SD gives a grade 2 orbit 44.69-year period, which will make a nearly complete quarter turn by the 2040s. One to keep an eye on. Burnham discovered it at 0.4" with the 18.5-inch Dearborn refractor and called it "a most interesting triple."
08h 04m 23.10s +12° 17' 23.8" P.A. 239.80 sep 0.5 mag 8.46,8.83 Sp K0V dist. 33.2 pc (108.3 l.y.)
J 420 AB: 508; 285x: Nice near equal pair, good close separation, forms a triagle with two other stars. I find no overlap of the parallax ranges, -95%, very doubtful this is binary. SD is giving a grade 5 orbit of 168.45-years, which seems entirely incorrect.
08h 06m 15.16s +02° 00' 47.3" P.A. 192.70 sep 2.2 mag 11.06,11.46 dist. 114.03 pc (371.97 l.y.)
STF1196 AB: 178; 285x: Zeta-2 Cnc. Gorgeous triple. AB is the tight pair, a nice close split, slight delta. The C is an equal mag star well split at a near right angle PA. There's no Gaia parallax data for the primary, but this star is well studied, and SD gives a grade 1 orbit 59.42-year period, near due north now, will be near due west by 2040.
08h 12m 12.79s +17° 38' 51.2" P.A. 0.90 sep 1.1 mag 5.30,6.25 Sp F8V dist. 25.08 pc (81.81 l.y.)
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