I covered the 6-inch and set up my 80mm f/15, and while all the features were on a smaller scale, and there was not quite as much detail, it did not give up very much to the 6-inch. At least I have a back-up!
At night the seeing was not very good, though it did improve somewhat later in the night and when viewing at higher elevations. I masked to 7-inch and observed Struves for a couple hours. Most were easy, but a few pretty tough challenges.
STF 688 AB: 178; 150x: Easy, wide, near equal, A is light orange, spectral class K3V+F1 (yellow-orange/yellow-white). WDS says proper motion indicates physical, and I find 69% parallax range overlap, 2,066 AU weighted separation, and 2.5+2.4 Msol, so likely they are binary.
05h 19m 20.88s -10° 44' 49.9" P.A. 95.00 sep 10.5 mag 7.52,7.55 Sp K3V+F1
STF 693 AB: 178; 150x: Fairly faint, well split, near equal. WDS says physical, and there is 2% parallax overlap, 856 AU weighted separation, 1.9+1.7 Msol, so probably binary
05h 21m 39.91s -02° 03' 04.6" P.A. 11.00 sep 3.5 mag 9.09,9.52 Sp A7V dist. 201.61 pc (657.65 l.y.)
STF 709 AB: 178; 150x: Fairly faint, wide, 1 Dm. WDS says not physical, and there is no parallax range overlap, -49%, so they are not.
05h 24m 44.91s -07° 42' 08.9" P.A. 320.00 sep 11.9 mag 9.88,10.26 Sp G5
STF 713 AB: 178; 150x: White A and significantly fainter B, well separated. WDS uncertain, however there is 94% parallax range overlap, only 354 AU weighted separation, and 1.2+0.9 Msol, so they are likely binary.
05h 27m 13.10s +06° 57' 58.7" P.A. 30.00 sep 3.2 mag 9.36,10.30 Sp G0
STF 744 AB: 178; 150x: Significantly fainter B is widly separated, can see it direct but it brightens with averted vision. WDS says physical, but there is no overlap to the parallax ranges -21%, so they are not binary.
05h 35m 30.65s +07° 16' 21.2" P.A. 268.00 sep 13.2 mag 9.25,11.48 Sp F8 dist. 185.87 pc (606.31 l.y.)
STF 748 AB: 178; 150x: One of the trapezium pairs, 1 Dm, wide around 9". WDS says uncertain, however there is 84% parallax range overlap, 3,340 AU weighted separation, and 4.1+3.1 Msol
05h 35m 15.82s -05° 23' 14.3" P.A. 32.00 sep 8.9 mag 6.55,7.49 Sp B0.5V+B1V dist. 18.93 pc (61.75 l.y.)
STF 693 AB: 178; 150x: Fairly faint, well split, near equal. WDS says physical, and there is 2% parallax overlap, 856 AU weighted separation, 1.9+1.7 Msol, so probably binary
05h 21m 39.91s -02° 03' 04.6" P.A. 11.00 sep 3.5 mag 9.09,9.52 Sp A7V dist. 201.61 pc (657.65 l.y.)
STF 709 AB: 178; 150x: Fairly faint, wide, 1 Dm. WDS says not physical, and there is no parallax range overlap, -49%, so they are not.
05h 24m 44.91s -07° 42' 08.9" P.A. 320.00 sep 11.9 mag 9.88,10.26 Sp G5
STF 713 AB: 178; 150x: White A and significantly fainter B, well separated. WDS uncertain, however there is 94% parallax range overlap, only 354 AU weighted separation, and 1.2+0.9 Msol, so they are likely binary.
05h 27m 13.10s +06° 57' 58.7" P.A. 30.00 sep 3.2 mag 9.36,10.30 Sp G0
STF 744 AB: 178; 150x: Significantly fainter B is widly separated, can see it direct but it brightens with averted vision. WDS says physical, but there is no overlap to the parallax ranges -21%, so they are not binary.
05h 35m 30.65s +07° 16' 21.2" P.A. 268.00 sep 13.2 mag 9.25,11.48 Sp F8 dist. 185.87 pc (606.31 l.y.)
STF 748 AB: 178; 150x: One of the trapezium pairs, 1 Dm, wide around 9". WDS says uncertain, however there is 84% parallax range overlap, 3,340 AU weighted separation, and 4.1+3.1 Msol
05h 35m 15.82s -05° 23' 14.3" P.A. 32.00 sep 8.9 mag 6.55,7.49 Sp B0.5V+B1V dist. 18.93 pc (61.75 l.y.)
STF 750 AB: 178; 150x: White A and 2 Dm, well separated B, near an arc of stars. WDS uncertain, however there is 29% parallax range overlap, 1,632 AU weighted separation, and substaintial 4.3+2.7 Msol.
05h 35m 31.07s -04° 21' 50.6" P.A. 61.00 sep 4.2 mag 6.43,8.39 Sp B2.5IV dist. 361.01 pc (1177.61 l.y.)
STF 763 AB: 178; 150x: Fairly faint pair, well separated, significant delta magnitude. WDS says Proper motion indicates physical. There is 3% parallax range overlap, 374 AU weighted separation, and 1.0+0.9 Msol, so it is possible they are binary.
05h 39m 17.19s +10° 15' 35.5" P.A. 319.00 sep 6.3 mag 8.89,9.48 Sp F8 dist. 61.8 pc (201.59 l.y.)
STF 766 AB: 178; 150x: Easy pair, white A and wide 1 Dm B. WDS says physical, but there is no parallax data for the primary.
05h 40m 18.85s +15° 21' 00.2" P.A. 275.00 sep 10.1 mag 7.00,8.36 Sp F0 dist. 257.07 pc (838.56 l.y.)
STF 788 AB: 178; 150x: Easy white A and 3 Dm B, fairly close. AC is a similar magnitude star around 60 degrees in PA compared to the AB pair, but much farther out. WDS is uncertain, but there is 12% parallax range overlap, 1,967 AU weighted separation, and 2.7+1.6 Msol, so they are possibly binary.
05h 44m 43.46s +03° 49' 53.1" P.A. 91.00 sep 7.5 mag 7.61,10.05 Sp B9 dist. 295.86 pc (965.1 l.y.)
STF 790 AB: 178; 150x: Bright light yellow A (spectral class G8III: yellow) and well separated, 3 Dm B. WDS says physical, however there is no parallax range overlap, -21%, so these are not binary.
05h 46m 02.87s -04° 16' 06.5" P.A. 88.00 sep 7.0 mag 6.43,8.98 Sp G8III: dist. 111.48 pc (363.65 l.y.)
STF 804 AB: 178; 150x: Wide separation, near equal. WDS say parallax indicates physical, and there is 48% overlap of their parallax ranges, but the weighted separation is a very far 14,217 AU, and the Msol is a little low at 2.5+2.0 -- so these probably are not binary.
05h 48m 54.61s -09° 42' 53.7" P.A. 98.00 sep 26.4 mag 9.65,10.58 Sp A2
STF 815 AB: 178; 150x: White A and 2 Dm wide B. WDS says physical, and there is 12% paralax range overlap, 4,227 AU weighted separation, and 2.7+1.6 Msol. However the radial velocity delta (5.91) exceeds the escape velocity (1.35), so these are or will not remain binary.
05h 54m 35.83s +05° 21' 13.4" P.A. 137.00 sep 13.1 mag 8.35,9.82 Sp G5 dist. 138.12 pc (450.55 l.y.)
STF 790 AB: 178; 150x: Bright light yellow A (spectral class G8III: yellow) and well separated, 3 Dm B. WDS says physical, however there is no parallax range overlap, -21%, so these are not binary.
05h 46m 02.87s -04° 16' 06.5" P.A. 88.00 sep 7.0 mag 6.43,8.98 Sp G8III: dist. 111.48 pc (363.65 l.y.)
STF 804 AB: 178; 150x: Wide separation, near equal. WDS say parallax indicates physical, and there is 48% overlap of their parallax ranges, but the weighted separation is a very far 14,217 AU, and the Msol is a little low at 2.5+2.0 -- so these probably are not binary.
05h 48m 54.61s -09° 42' 53.7" P.A. 98.00 sep 26.4 mag 9.65,10.58 Sp A2
STF 815 AB: 178; 150x: White A and 2 Dm wide B. WDS says physical, and there is 12% paralax range overlap, 4,227 AU weighted separation, and 2.7+1.6 Msol. However the radial velocity delta (5.91) exceeds the escape velocity (1.35), so these are or will not remain binary.
05h 54m 35.83s +05° 21' 13.4" P.A. 137.00 sep 13.1 mag 8.35,9.82 Sp G5 dist. 138.12 pc (450.55 l.y.)
STF 816 AB: 178; 150x: White A and very light orange B, very pretty, 2 Dm, wide around 5". WDS uncertain, but there is no overlap in parallax ranges (-82%), so they are not binary.
05h 54m 55.46s +05° 51' 38.8" P.A. 287.00 sep 4.0 mag 6.90,9.27 Sp B9 dist. 239.23 pc (780.37 l.y.)
STF 826 AB: 178; 205x: A challenge, very close split, >1 Dm, around 2", need best seeing. WDS is uncertain, but there is no overlap in parallax ranges (-44%), so they are not binary.
05h 58m 54.46s -01° 19' 31.0" P.A. 132.00 sep 2.0 mag 8.84,9.68 Sp B9
STF 835 AB: 178; 150x: Tough pair, need averted vision for B to appear, a good split around 2". WDS uncertain, and unfortnately the secondary seems missing from the Gaia data.
06h 04m 59.00s +18° 18' 39.8" P.A. 150.00 sep 2.4 mag 9.10,10.10 Sp A3 dist. 203.67 pc (664.37 l.y.)
STF 839 AB: 178; 150x: Near equal white stars, easily split around 5". WDS says proper motion indicates physical, however there is no overlap in their parallax ranges -22%, so they are 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 836 AB: 178; 205x: Quite fine, 1 Dm, white. WDS says Parallax indicates physical, however there is no overlap in the parallax ranges (-21%), so these are not binary.
06h 02m 30.98s -02° 21' 39.8" P.A. 24.00 sep 2.0 mag 8.57,10.08 Sp A0
STF 846 AB: 178; 150x: White A and faint b, well split. WDS uncertain, but there is no parallax range overlap -12%, so they are not 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 850 AB: 178; 150x: Close split, around 2", 1 Dm. WDS says Proper motion indicates physical, however there is no overlap in their parallax ranges, -57%, so these are 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 852 AB: 178; 150x: White A and very wide, very faint B, need averted vision.
06h 08m 36.21s +07° 17' 50.0" P.A. 320.00 sep 9.3 mag 9.92,10.90 Sp F5
STF 856 AB: 178; 150x: Whtie and more >2 Dm B, failry wide. In front of a cloud of faint stars, rich field. WDS uncertain, but there is 80% parallax range overlap, but a pretty far 5,079 AU weighted separation, 3.0+1.7 Msol, so might be binary.
06h 09m 07.83s +07° 03' 19.5" P.A. 50.00 sep 10.3 mag 8.50,10.99 Sp A0 dist. 373.13 pc (1217.15 l.y.)
STF 859 AB: 178; 150x: Gold A and blue B, near equal, superwide. WDS says not physical, and there is no Gaia data for the secondary.
06h 09m 35.88s +05° 40' 07.6" P.A. 242.00 sep 45.2 mag 8.49,8.97 Sp G0 dist. 28.79 pc (93.91 l.y.)
STF 871 AB: 178; 150x: White stars, near equal, well split. WDS uncertain, but there is 48% parallax range overlap, 3,812 AU weighted separation, and 2.9+2.6 Msol, so they may be binary.
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; 150x: Faint near equal pair, easy, well spit. WDS says not physical, and there is no overlap in their parallax ranges, -93%
06h 12m 37.71s -01° 18' 07.6" P.A. 294.00 sep 8.6 mag 9.87,10.42 Sp G
STF 867 AB: 178; 150x: Very pretty blue-white A (spectral class B9.5III blue-white) and light orange B, nearly 2 Dm, closely split around 2".
06h 11m 39.01s +17° 22' 39.3" P.A. 159.00 sep 2.3 mag 7.53,8.88 Sp B9.5III
STF 885 AB: 178; 150x: Pretty pair, light orange A and wide 2 Dm B. Near rough circlet of similar magnitude stars. WDS says not physical, but there is 76% overlap of the parallax ranges, a wide 8,715 AU weighted separation, 3.6+2.4 Msol, so might be binary.
06h 16m 51.65s +05° 59' 45.6" P.A. 297.00 sep 10.1 mag 8.99,10.52 Sp A0
STF1207 AB: 178; 150x: Whtie A and 2 Dm B, very wide. WDS says not physical, and there is -73% overlap of the parallax ranges
08h 15m 15.82s +05° 33' 28.9" P.A. 191.00 sep 13.9 mag 8.77,11.31 Sp A0 dist. 319.49 pc (1042.18 l.y.)
STF1213 AB: 178; 205x: Pretty faint, >1 Dm, well split but needed more magnification to see it well. WDS says not physical, and there is no overlap, -55%, in their parallax ranges.
08h 17m 56.56s +06° 28' 07.7" P.A. 304.00 sep 6.0 mag 9.80,11.50 Sp F0
STF1216 AB: 178; 333x: White stars, very slight snowman, significant delta mag, can tell PA to the NW. Physical with a 402-year period, there is no Gaia data for the primary.
08h 21m 20.28s -01° 36' 07.3" P.A. 313.20 sep 0.5 mag 6.85,7.88 Sp A2Vpn: dist. 156.49 pc (510.47 l.y.)
08h 26m 11.23s +04° 30' 10.0" P.A. 144.00 sep 2.5 mag 8.46,10.52 Sp A2
STF1267 AB: 178; 150x: Light orange A (spectral class M, red), and very faint B, nice separation, very good pair. WDS uncertain, but there is no overlap, -91%, of the parallax ranges, so not binary.
08h 46m 30.72s +04° 19' 01.4" P.A. 61.00 sep 10.9 mag 8.23,11.50 Sp M
STF1264 AB: 178; 150x: Near equal white stars, well separated. WDS says Proper motion indicates physical, but there is no overlap at all, -86%, of the parallax ranges, so they are not binary.
08h 42m 15.56s -08° 23' 58.4" P.A. 269.00 sep 6.4 mag 9.42,9.49 Sp F5
STF1260 AB: 178; 150x: Slightly unqeual white stars, wide. WDS says physical, and indeed there is 80% parallax range overlap, 729 AU weighted average separation, and 1.9+1.7 Msol, so they are likely binary.
08h 40m 41.40s -12° 10' 08.6" P.A. 301.00 sep 5.3 mag 7.86,8.07 Sp A2 dist. 139.28 pc (454.33 l.y.)
STF1295 AB: 178; 150x: This was behind the meridian tree when I slewed to it. So I let it track for a bit and distracted myself with binoculars. A few minutes later I went back to the scope and theree it was, this pair, a slighly unequal well separated around 4" pair. WDS is uncertain, but there is 8% parallax range overlap, 372 AU weighted separation, and 2.0+1.9 Msol, so there is a possibility these are binary.
08h 55m 29.60s -07° 58' 15.9" P.A. 3.00 sep 4.0 mag 6.73,6.93 Sp A2m+A7m dist. 88.5 pc (288.69 l.y.)
STF 886 AB: 178; 150x: Faint but fine pair, well separated, >1 Dm. WDS uncertain, but there is no overlap, -94%, of the parallax ranges, so they are not binary.
06h 18m 57.74s +23° 16' 30.6" P.A. 194.00 sep 4.8 mag 10.20,12.20
STF 942 AB: 175: 150x: Fine, faint, near equal pair. WDS says physical, but there is 7% overlap in the parallax ranges, 982 AU weighted separation, and 1.6+1.6 Msol, so they might be binary.
06h 37m 40.87s +23° 38' 54.2" P.A. 246.00 sep 3.5 mag 10.07,10.10 Sp F0
STF 959 AB: 178; 150x: Very faint B, need averted vision to show it, wide separation. At the edge of an open cluster. WDS says physical, and there is 52% parallax range overlap, 2,612 AU weighted separation, 1.5+1.4 Msol, so they might be binary.
06h 44m 57.18s +13° 45' 38.0" P.A. 175.00 sep 11.8 mag 9.86,10.13 Sp G5
STF 997 AB: 178; 150x: White and 2 Dm B, well separated, in a rich area. WDS uncertain, but there is 77% overlap of parallax ranges, 832 AU weighted separation, and 3.0+5.7 Msol, so they may be binary.
06h 56m 06.59s -14° 02' 33.6" P.A. 343.00 sep 2.9 mag 5.27,7.14 Sp G5III+A2 dist. 381.68 pc (1245.04 l.y.)
STF3116 AB: 178; 205x: Fairly bright A, FR CMa, B appears with averted vision only, very closely separated around 4". WDS uncertain, but there is 27% overlap of parallax ranges, 2,106 AU weighted separation, 6.3+2.6 Msol, so they might be binary.
06h 21m 24.71s -11° 46' 23.6" P.A. 23.00 sep 3.9 mag 5.55,9.70 Sp B1Vpe+B9V dist. 337.84 pc (1102.03 l.y.)
STF 990 AB: 178; 205x: Very tough, needed averted vision to reveal the very close, very finat B. WDS says not physical, but there is 10% parallax range overlap, 2,510 AU weighted separation, 3.0+2.7 Msol, though nearly diverging proper motion -- so might be binary.
06h 54m 20.27s -14° 14' 34.2" P.A. 275.00 sep 3.2 mag 9.55,10.23 Sp B8/9Ib dist. 215.98 pc (704.53 l.y.)
STF 972 A-BC: 178; 150x: 1 Dm, pretty wide, faint. WDS says not physical, but no parallax data for the secondary.
06h 48m 22.15s -15° 19' 47.3" P.A. 154.00 sep 12.5 mag 8.28,9.27 Sp B8 dist. 86.58 pc (282.42 l.y.)
STF 971 AB: 178; 300x: Very difficult, need best seeing, hairline split, significant delta magnitude. WDS uncertain, and there is no overlap, -1%, of parallax range overlap, so not binary.
06h 48m 21.40s -13° 26' 27.0" P.A. 323.00 sep 1.2 mag 8.58,8.85 Sp F5/6V
No comments:
Post a Comment