27 february 2022

A very productive night flying through Struves in Auriga, which has taken me several days to put togehter in a post as there were so many observations.  Seeing was good enough for 7-inches but did not hold up well with 20-inches, so it was a fine night for these pairs.  Many similar wide and moderate delta magnitude pairs, plus a few pleasant surprises along the way.  Observed from around 8:30-10:30pm

STF 603 AB: 178; 150x: Near equal white stars, widely separated.  WDS says proper motion indicates physical, and there is 52% parallax range overlap, 1,422 AU weighted separation, 1.7+1.7 Msol, so they may well be binary.
04h 54m 13.68s +49° 34' 52.3" P.A. 242.00 sep 8.6 mag 8.72,8.88 Sp G0

STF 613 AB: 178; 150x: Very light yellow stars, well separated, 1 Dm.  Not physical per WDS, and indeed there is no parallax range overlap, -95%.
04h 58m 50.74s +44° 08' 21.8" P.A. 99.00 sep 11.6 mag 8.59,9.58 Sp F2III

STF 619 AB: 178; 150x: Near equal white stars, well separated around 4".  WDS says physical with a 49,000 year period, which is simply peposterous.  There is no parallax range overlap, -83%, so these are not binary.
05h 01m 19.93s +50° 15' 25.3" P.A. 161.00 sep 4.2 mag 9.51,9.88 Sp F4V

STF 621 AB: 178; 150x: Faint pair, 1 Dm, pretty wide around 10".  Proper motion indicates physical per WDS, and there is 30% parallax range overlap, 2,383 AU weighted separation, and only 1.6+1.4 Msol.  The radial velocity delta (4.7) exceeds the escape velocity (1.5), so it is very likley not to be binary.
05h 00m 47.31s +39° 12' 32.7" P.A. 133.00 sep 10.0 mag 9.83,10.30 Sp F0

STF 640 AB: 178; 150x: White star, >1 Dm, wide around 10".  There is 10% parallax range overlap, 1,532 AU weighted separation, and 1.7+1.3 Msol, so there is some chance it is binary.
05h 07m 02.02s +33° 24' 48.1" P.A. 100.00 sep 9.2 mag 8.67,10.00 Sp A7V

STF 644 AB: 178; 150x: Lovely close yellow-white stars, just separated by one diffraction ring, not quite 1 Dm.  WDS uncertain, and there is 13% parallax range overlap, 1,476 AU weighted separation, substantial 6.3+7.3 Msol, so it might be binary. 
05h 10m 18.81s +37° 18' 06.7" P.A. 221.00 sep 1.6 mag 6.96,6.78 Sp B2II+K3 dist. 485.44 pc (1583.51 l.y.)

STF 648 AB: 178; 150x: Nice, nearly 2 Dm, fairly wide around 5", light yellow stars.  WDS has an orbital solution, and there is 14% parallax range overlap, 211 AU weighted separation, 1.1+0.9 Msol, and the radial velocity delta (1.3) is less than the escape velocity (4.0), so they are binary.  1658-year period
05h 10m 59.19s +32° 02' 19.5" P.A. 60.90 sep 4.6 mag 8.14,8.93 Sp G5 dist. 42.44 pc (138.44 l.y.)

STF 653 AB: 178; 150x: At first I did not see faint B, but it eventually appeared with averted vision.  C is a brighter but wider star than B, and together they form a bent arc.  C has a near same magnitude pair but I could not see it in the 7-inch or 20-inch.  WDS says AB is not physical, and indeed there is -91% parallax range overalp.  AC not physical either.  Ca-Cb, BAS5, is listed as physical but is really not visible.  It's one of the stars in M.A. Barstow et al's 2001 paper "Resolving Sirius-like Binaries with the Hubble Space Telescope" using the ultraviolet imaging array. 

05h 15m 24.39s +32° 41' 15.3" P.A. 11.00 sep 9.8 mag 5.03,10.90 Sp A9IV dist. 87.57 pc (285.65 l.y.)

STF 657 AB: 178; 205x: Light yellow-orange stars, 1 Dm, not quite split with 150x, nicely split at 205x.  WDS uncertain, but there is no parallax range overlap (-4%), so not likley to be binary.

05h 18m 47.19s +52° 49' 51.8" P.A. 316.00 sep 0.9 mag 8.30,8.81 Sp F5 dist. 115.47 pc (376.66 l.y.)

STF 673 AB: 178; 200x: Very fine, >1 Dm, very close split around 1.5", bluish color.  WDS uncertain, there is no parallax range overlap, -22%, so not likely to be binary.  
05h 20m 50.46s +50° 36' 56.9" P.A. 271.00 sep 1.4 mag 9.24,10.42 Sp A0 dist. 220.75 pc (720.09 l.y.)

STF 685 AB: 178; 150x: Very fine pair, >1 Dm, about 2" split, realy nice.  WDS uncertain, but there is no parallax range overlap (-78%), so not binary.
05h 23m 53.44s +50° 28' 09.3" P.A. 316.00 sep 2.1 mag 9.13,10.46 Sp K5

STF 711 AB: 178; 150x: White A and reddish B, wide, 2 Dm.  WDS says physical with an orbital solution, but there is no overalp in parallax range (-44%), and in spite of the 313 AU weighted separation, 1.1+0.7 AU weighted separation, and the radial velocity delta (0.6) not exceeding the escape velocity (3.2), it's not likely to be a binary. 

05h 31m 28.89s +54° 39' 15.8" P.A. 223.20 sep 7.5 mag 7.78,9.67 Sp G1+K2 dist. 39.31 pc (128.23 l.y.)

STF 717 AB: 178; 150x: White, wide, faint B need averted vision.  WDS says physical, but there is no parallax range overlap (-55%), so they are not.
05h 32m 54.87s +52° 07' 41.2" P.A. 291.00 sep 17.3 mag 8.68,11.67 Sp K0 dist. 1612.9 pc (5261.28 l.y.)

STF 718 AB: 178; 150x: White stars, near equal, wide.  WDS says physical, and there is 17% of parallax range overlap, 847 AU weighted separation, 1.8+1.8 Msol, and the radial velocity delta (2.7) is just below the escape velocity (2.8), so these may well be binary.  
05h 32m 20.59s +49° 23' 36.5" P.A. 74.00 sep 7.7 mag 7.47,7.54 Sp F5 dist. 82.58 pc (269.38 l.y.)

STF 723 AB 178; 150x: Faint B is just visible with direct vision, closely separated, about 5", 2 Dm.  WDS says physical, but there is no parallax range overlap, -13%, so not binary.
05h 34m 34.26s +51° 55' 13.6" P.A. 107.00 sep 4.8 mag 8.92,10.67 Sp A0 dist. 235.29 pc (767.52 l.y.)

STF 769 AB: 178; 150x: White A and fairly faint B, well separated around 4", 2 Dm.  WDS uncertain, but there is 17% parallax range overlap, 860 AU weighted separation, 2.2+1.4 Msol, so likely to be binary.
05h 45m 28.69s +53° 19' 37.9" P.A. 180.00 sep 3.6 mag 8.19,10.00 Sp A2 dist. 249.38 pc (813.48 l.y.)

STF 810 AB: 178; 150x: Equal 10th magnitude stars, close split around 2", nicely resolved.  WDS says not physical, and there is -2% parallax range overlap, 732 AU weighted separation, 1.6+1.5 Msol, but the radial velocity delta (18.4) far exceeds the escape velocity (2.8), so they are not binary.
05h 56m 32.07s +52° 56' 24.1" P.A. 245.00 sep 2.2 mag 10.01,10.40 Sp A3

STF 794 AB: 178; 150x: White A and light orange B, 1 Dm, wide
05h 51m 50.96s +48° 44' 25.9" P.A. 315.00 sep 9.7 mag 9.28,11.34 Sp A

STF 803 AB: 178; 150x: Nice. This pair lies in the center of a kite asterism, with four other stars similar magnitude forming the kit, and even a train of faint stars for a tail.  B appears with averted vision and is barely held direct, wide.  WDS is uncertain, but this is not binary as there is no overlap in parallax ranges, -92%.  STF 802 is the western star in the kite asterism and is in the same field.  
05h 52m 38.19s +40° 08' 19.8" P.A. 37.00 sep 11.1 mag 9.93,12.40

STF 802 AB: 178; 150x: Nice pair, 1 Dm, close around 2".  WDS says physical, and there is 79% parallax range overlap, 199 AU weighted separation, 1.2+1.0 Msol, and the radial velocity delta (0.8) is less than the escape velocity (4.4), so it is binary.  In the same field with STF 803.

05h 52m 30.85s +40° 08' 53.9" P.A. 106.00 sep 2.4 mag 8.92,9.57 Sp G0 dist. 96.43 pc (314.55 l.y.)

STF 799 AB: 178; 300x: Hairline split, 1 Dm, bluish color stars, a real challenge object for the aperture.  WDS uncertain, and unfortunately there is no Gaia data for the secondary.
05h 52m 13.88s +38° 33' 36.4" P.A. 158.00 sep 0.8 mag 7.30,8.26 Sp B8 dist. 211.86 pc (691.09 l.y.)

STF 791 AB: 178; 150x: Wide 1Dm, easy pair.  WDS says not physical, but in fact there is 83% parallax range overlap, a not impossibly large 3,933 AU weighted separation, 3.4+2.8 Msol, which means it is likely to be binary.
05h 50m 03.41s +39° 34' 34.7" P.A. 91.00 sep 5.0 mag 9.07,9.98 Sp A0 dist. 3448.28 pc (11248.29 l.y.)

STF 807 AB: 178; 150x:  Fine pair, white A and orange B, 2 Dm.  WDS uncertain, there is 2% parallax range overlap, only 217 AU weighted separation, 1.5+1.0 Msol, so there is some chance it is binary.
05h 52m 52.73s +34° 26' 42.5" P.A. 153.00 sep 2.4 mag 8.01,9.72 Sp F8 dist. 95.88 pc (312.76 l.y.)

STF 811 AB: 178; 150x: Nice looking pair, 2 Dm, well split, white A and orange B.  WDS uncertain, but there is no parallax range overlap (-27%), so they are not binary.
05h 54m 15.97s +30° 29' 37.7" P.A. 234.00 sep 5.2 mag 7.97,9.30 Sp B5

STF 796 AB: 178; 150x: Beautiful yellow-white A, 2 Dm B star well split around 4".  WDS uncertain, but there is no parallax range overlap, -43%, so they are not binary.

05h 49m 55.53s +31° 47' 08.7" P.A. 62.00 sep 3.7 mag 7.24,8.23 Sp A3 dist. 168.35 pc (549.16 l.y.)

STF 783 AB; 178; 150x: White A and 2 Dm wide B
05h 44m 37.74s +29° 00' 59.7" sep 8.3 mag 8.05,9.70 Sp B5 dist. 793.65 pc (2588.89 l.y.)

STF 781 AB: 178' 150x: B is wide, appears with averted vision at first and then can hold direct.  Many other faint stars in the view, any one of which could count as a pairing.  WDS uncertain, and there is -80% parallax range overlap, so they are not binary.

05h 45m 15.54s +32° 23' 40.0" P.A. 120.00 sep 15.4 mag 9.23,10.40 Sp B5V

STF 778 AB: 178; 150x: White A and >1 Dm B, well separated around 3".  WDS says not physical, but there is 21% parallax range overlap, 5,119 AU weighted separation, and 5.6+4.2 Msol, so there is a good chance they are binary.
05h 44m 05.16s +30° 56' 01.8" P.A. 186.00 sep 3.5 mag 8.44,10.11 Sp B3II dist. 1818.18 pc (5930.9 l.y.)

STF 737 AB; 178; 150x: Near equal white stars in the middle of a large open clsuter NGC 1960, really pretty.  WDS says not physical, but there is 65% parallax range overlap, a very wide 12,940 AU weighted separation, 4.1+3.9 Msol.  They might be binary, but maybe the open cluster will rip them apart.
05h 36m 22.66s +34° 08' 01.8" P.A. 305.00 sep 11.0 mag 9.13,9.38 Sp B2

STF 736 AB: 178; 150x: Nice 2 Dm white stars, close about 3". WDS says physical, and there is 47% parallax range overlap, only 112 AU weighted separation, 1.2+0.9 Msol, so very likely to be binary.
05h 37m 07.20s +41° 49' 41.7" sep 2.7 mag 7.45,8.57 Sp F8 dist. 44.19 pc (144.15 l.y.)

STF 727 AB: 178; 150x: Closely separated, >1 Dm.  WDS uncertain, and there is no parallax range overlap, -48%, so not binary.
05h 33m 51.00s +44° 47' 08.8" P.A. 60.00 sep 2.3 mag 8.13,9.16 Sp F5 dist. 543.48 pc (1772.83 l.y.)

STF 715 AB: 178; 300x: Strongly notched elongation, significant delta magnitude, white stars.  WDS uncertain, but there is no parallax range overlap -10%, so not likely binary.
05h 30m 13.12s +41° 16' 57.1" P.A. 203.00 sep 0.9 mag 8.50,9.24 Sp A0 dist. 757.58 pc (2471.23 l.y.)

STF 699 AB: 178; 150x: White stars, half delta magnitude, wide.  WDS says physical, but there is no overlap in the parallax ranges, -4%, so they are not binary.
05h 25m 38.50s +38° 02' 41.1" P.A. 346.00 sep 8.9 mag 7.90,8.61 Sp A1V dist. 308.64 pc (1006.78 l.y.)

STF 684 AB: 178; 205x: Resolved with seeing, nearly 2 Dm, white A and blue B, very closely split around 2".  WDS uncertain, but there is no overlap of the parallax ranges, -11%, so they are not binary, which is too bad because this is a pretty pairing.

05h 22m 11.04s +45° 04' 53.9" P.A. 141.00 sep 1.5 mag 7.72,9.34 Sp B8III dist. 5882.35 pc (19188.23 l.y.)

STF 669 AB: 178; 150x: Yellow-white, near equal, wide.  WDS uncertain, and there is 52% overlap of the parallax ranges, 1,687 AU weighted separation, and a significant 1.9+1.6 Msol.  However the radial velocity delta 2.1 slightly exceeds the escape velocity 1.9, so it might not be binary.
05h 18m 56.78s +45° 14' 51.4" P.A. 278.00 sep 9.8 mag 8.44,8.97 Sp F0

STF 658 AB: 178; 150x: 2 Dm, wide, white, easy pair.  WDS says physical, and there is 54% overlap of the parallax ranges, 1,612 AU weighted separation, and 2.0+1.5 Msol, so it may well be binary.
05h 16m 40.03s +39° 02' 44.9" P.A. 190.00 sep 5.8 mag 9.02,10.25 Sp A2 dist. 377.36 pc (1230.95 l.y.)

STF 599 AB: 178; 150x: White stars, 2 Dm, wide.  WDS uncertain, but there is 27% overlap of the parallax ranges, 5,484 AU weighted separation, and 3.1+2.2 Msol, so they may be binary.
04h 51m 04.84s +44° 58' 07.8" P.A. 336.00 sep 10.5 mag 8.68,10.14 Sp B9V dist. 148.15 pc (483.27 l.y.)

STF 666 AB: 178; 150x: Near equal white pair, fairly closely split.  WDS says parallax indicates physical, and there is 36% overlap in the parallax ranges, 573 AU weighted separation, and 2.2+2.2 Mso, so they may well be binary.
05h 17m 05.80s +33° 19' 47.2" P.A. 75.00 sep 3.2 mag 7.85,7.89 Sp A3V

STF 687 AB: 178; 150x: Easy, very wide, 2 Dm.  WDS says proper motion indicates it is not physical.  However, there is 59% overlap in the parallax ranges, a pretty wide 19,000 AU weighted separation balanced by weighty 4.4+3.5 Msol, so these may turn out to be binary.
05h 22m 18.09s +33° 47' 54.3" P.A. 70.00 sep 17.3 mag 8.69,9.77 Sp B2V dist. 75.53 pc (246.38 l.y.)

STF 706 AB: 178; 150x: Fairly close around 3", >1 Dm, white, in a rich field.  WDS says not physical, and there is -6% overlap of the parallax ranges, so likely not binary.
05h 26m 18.56s +30° 20' 08.5" P.A. 44.00 sep 3.6 mag 9.00,9.87 Sp F5

STF 719 AB: 178; 205x: Exellent yellow stars, very closely split, 2 Dm.  Very wide, slightly fainter C in a similar PA.  WDS says physical, but there is -29% overlap of the parallax ranges, so they are not binary.
05h 30m 06.14s +29° 32' 55.3" P.A. 336.00 sep 1.4 mag 7.50,8.76 Sp G5 dist. 169.78 pc (553.82 l.y.)

STF 821 AB: 178; 150x: Lovely, nearly 2 Dm, very closely split about 2", a string of three stars along the edge of the field of view.  WDS uncertain, but there is 66% overlap of the parallax ranges, 463 AU weighted separation, 2.1+1.6 Msol, so they are very likely binary.
05h 58m 24.04s +29° 37' 37.5" P.A. 4.00 sep 2.2 mag 8.33,9.44 Sp B9 dist. 242.72 pc (791.75 l.y.)

STF 861 BC: 178; 150x: This is the archetypical 2+1 pair.  A is a bright star with a widely split BC, which is a delicate equal pair about 2" separated, and both 1 Dm from the A.  WDS uncertain about BC, but dissapointinly there is -52% overlap in the parallax range, so they are not binary.

06h 11m 21.12s +30° 41' 23.2" P.A. 315.00 sep 1.7 mag 9.06,9.25 Sp F8

 

STF 862 AB: 178; 150x: Light yellow-white A and nearly 3 Dm wide B.  WDS uncertain, but there is -45% overlap in the parallax ranges, which settles it, they are not binary.

06h 12m 05.49s +29° 29' 31.7" P.A. 338.00 sep 6.9 mag 7.55,10.84 Sp G2Ib dist. 564.97 pc (1842.93 l.y.)

STF 879 AB: 178; 150x: Faint pair, 1 Dm, wide.  WDS says physical, and there is 33% parallax range overlap, 1,819 AU weighted separation, 1.5+1.1 Msol, so they are probably binary.
06h 16m 18.79s +30° 04' 34.2" P.A. 70.00 sep 7.7 mag 10.10,11.40

STF 902 AB: 178; 150x: 1 Dm, wide.  WDS says not physical, and there is -92% overlap in parallax ranges, so that's correct.

06h 27m 30.57s +34° 57' 19.4" P.A. 152.00 sep 11.2 mag 9.65,10.48 Sp F8

STF 906 AB: 178; 150x: Not quite 1 Dm, wide.  WDS uncertain, but there is 82% overlap in the parallax ranges, 805 AU weighted separation, 1.3+1.1 Msol, so they are likely binary.
06h 28m 44.86s +37° 22' 50.6" P.A. 337.00 sep 6.5 mag 9.14,10.13 Sp F5

STF 907 AB: 178; 150x: 1 Dm, wide.  WDS says not physical, but there is 27% parallax range overlap, 7,628 AU weighted separation, 2.9+2.1 Msol, so it is possible they could be binary.
06h 28m 09.96s +30° 25' 12.2" P.A. 302.00 sep 11.9 mag 9.40,10.38 Sp A0V

STF 929 AB: 178; 150x: 1 Dm, wide.  WDS uncertain, but there is -69% overlap in the parallax ranges, so they are not binary.
06h 35m 22.03s +37° 42' 55.1" P.A. 24.00 sep 6.5 mag 7.35,8.44 Sp G5 dist. 184.16 pc (600.73 l.y.)

STF 940 AB: 178; 150x: >1 Dm, wide.  WDS says physical, and there is 41% parallax range overlap, 2,585 AU weihted separation, and 2.1+1.4 Msol, so they might be binary.
06h 37m 16.56s +38° 25' 43.6" P.A. 295.00 sep 10.3 mag 8.76,10.29 Sp A5

STF 945 AB: 178; 300x: Subtle notched elongation.  WDS says physical with 2679.33-year period, but there is no parallax data in Gaia.
06h 40m 21.28s +40° 58' 10.9" P.A. 341.20 sep 0.5 mag 7.21,8.33 Sp F2 dist. 110.99 pc (362.05 l.y.)

STF 966 AB: 178; 150x: White and very faint B, 3 Dm, wide.  WDS uncertain, but there is -17% parallax range overlap, so they likely are not binary.

06h 50m 11.85s +39° 57' 11.2" P.A. 112.00 sep 5.2 mag 8.21,10.96 Sp G0 dist. 265.25 pc (865.25 l.y.)

STF 977 AB: 178; 150x: Very nice, faint pair, 2 Dm, closely split, 2".  WDS uncertain, but there is -49% parallax range overlap, so they are not binary.
06h 55m 25.23s +48° 33' 52.1" P.A. 129.00 sep 2.0 mag 8.76,9.88 Sp F2 dist. 176.99 pc (577.34 l.y.)

STF1042 AB: 178; 150x: 2 Dm, wide.  WDs says physical, and there is 19% parallax range overlap, 3,944 AU weighted separation, and 2.0+1.3 Msol.  The radial velocity delta 1.3, is just above the escape velocity, 1.2 -- so this may or may not turn out to be binary.
07h 15m 53.23s +42° 08' 54.8" P.A. 43.00 sep 11.9 mag 9.86,11.05 Sp K0

STF1079 AB: 178; 150x: 1 Dm, well separated. WDS says not physical, but there is 65% parallax range overlap, 1,434 AU weighted separation, and 1.7+1.3 Msol, so it very well may be binary
07h 24m 35.82s +37° 48' 41.0" P.A. 333.00 sep 5.6 mag 9.45,10.40 Sp A5

STF1018 AB: 178; 150x: Wide, 1 Dm.  WDS uncertain, but there is 20% parallax range overlap, 8,223 AU weighted separation, 3.3+2.5 Msol, so it may be binary.
07h 08m 49.93s +35° 53' 55.7" P.A. 18.00 sep 9.6 mag 9.30,10.66 Sp A0

STF 888 AB-C: 178; 150x: 2 Dm, well separated about 3".  Did not see BU 895 AB 0.1".  WDS says physical, but there is no parallax data for A.
06h 19m 58.96s +28° 25' 36.6" P.A. 265.00 sep 2.9 mag 7.46,9.63 Sp A6V dist. 132.98 pc (433.78 l.y.)

BU 1020 AB: 178; 150x: Very finat B is nearly lost in A's diffraction but resolves with seeing.  WDS uncertain, but there is 57% overlap in parallax ranges, 930 AU weighted separation, 3.8+2.1 Msol, so it is likely binary.

06h 23m 23.01s +28° 45' 21.0" P.A. 157.00 sep 1.3 mag 8.43,11.09 Sp B8 dist. 9090.91 pc (29654.55 l.y.)