8 february 2023

Seeing was predicted to be good so I opened up the 20-inch.  I tried for JOY 1 again after dinner, very shortly after dark.  I had the distinct sense of a white appendage to orange Mira, but it was not separated as I would expect and it was to the north, not the expected east PA.  So that likely was atmospheric dispersion.  It will be good seeing tonight again so I will give it another try.  It might be the last chance this season (or ever?) as the weather will be unsettled starting this weekend.  I suspect the accretion disk which is the B star is too faint at this time, at least for my scope.

Seeing got worse and transparency was poor -- very long contrails stretched across the sky and were illuminated by the rising waning moon.  So I masked down to 7-inches and continued through the Struve list, in Orion.  Struve had a lot of near equal ninth magnitude, well separated pairs -- I think mainly because of the richness of the winter Milky Way there are many such possible combinations, and probably most of them will not be binary.

I should mention seeing has been good during the day so solar viewing has been good.  I viewed with the 6-inch in white light, with many small pores and speckling seen.  In Ha the prominences looked nice, including one large triangle nearly disconnected from the limb with sprouted a tendril as I watched which arced back to the limb.  I could see it moving as it got closer to the limb.

STF 738 AB; 178; 150x: Bright white A and light yellow, 2 Dm B, nice close separation.  WDS says not physical, but there is 72% parallax range overlap, 1,715 AU weighted separation, 8.4+5.5 Msol, so there is a strong case for it to be binary, and an orbital solution should be made.
05h 35m 08.28s +09° 56' 03.0" P.A. 44.00 sep 4.3 mag 3.51,5.45 Sp O8III+B0V dist. 336.7 pc (1098.32 l.y.)

STF 728 AB: 178; 300x: Excellent pair, slight delta magnitude, B is grey compared to bright A, suspected at lower powers, needed higher power to split.  WDS grade 4 orbit, however there is no parallax data in Gaia for the secondary.  613.69-year period, it is nearing apastron of its proposed orbit but will take another 100 years to do so, with less than a 0.2" change in separation, so it's not possible to observe the change.
05h 30m 47.06s +05° 56' 53.3" P.A. 43.80 sep 1.4 mag 4.44,5.75 Sp B5V dist. 92.85 pc (302.88 l.y.)

STF 795 AB: 178; 300x: Very nice equal pair, light yellow stars, needed high power just split.  WDS grade 4 orbital solution, 1260-year period.  No Gaia parallax data for the secondary.  The proposed orbit has it whipping fast and close to the primary over the next 100 years.  
05h 48m 00.21s +06° 27' 14.5" P.A. 220.50 sep 1.0 mag 5.99,6.03 Sp A5V dist. 165.02 pc (538.3 l.y.)

STF 652 AB: 178; 300x: Excellent yellow A and light blue B, >1 Dm, split with lower powers best 300x.  WDS uncertain, and there is -9% parallax range overlap, so in spite of the mere 407 AU weighted separation, 3.8+2.7 Msol, it may not be binary.
05h 11m 45.35s +01° 02' 12.5" P.A. 180.00 sep 1.7 mag 6.26,7.44 Sp A+G2:III dist. 195.31 pc (637.1 l.y.)

STF 750 AB: 178; 125x: Lovey 2 Dm, well split, light-yellow A and dull white B.  WDS uncertain, there is 29% parallax range overlap but with 4% error, 1,632 AU weighted separation, 4.3+2.7 Msol, so there is some chance it is binary.

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 697 AB: 178; 125x: Slight delta mag, white stars, wide.  WDS says proper motion indicates physical, and there is 5% overlap of the parallax ranges, 8,622 AU weighted separation, 3.3+2.6 Msol, there is a very small chance it is binary.
05h 23m 31.74s +16° 02' 25.8" P.A. 287.00 sep 25.4 mag 7.27,8.10 Sp B7V dist. 268.1 pc (874.54 l.y.)

STF 813 AB: 178; 150x: Slight delta mag, rather closely split, white.  WDS uncertain, but there is 44% overlap of the parallax ranges, only 836 AU weighted separation, 2.2+2.1 Msol, so it has a good chance of being binary and an orbital solution is needed.
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.)

STF 766 AB: 178; 125x: White stars, nearly 1 Dm, wide.  WDS says it's physical, though there is no Gaia 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 724 AB: 178; 125x: Nearly 1 Dm, fairly wide white stars.  WDS says they're not physical, and there is no overlap of their parallax ranges, -68%, they are not binary.
05h 30m 17.57s +11° 01' 17.1" P.A. 253.00 sep 6.8 mag 9.30,10.60 Sp A2

STF 763 AB: 178; 125x: Near equal white stars, well separated.  WDS says proper motion indicates physical, and there is a mere 3% overlap of the parallax ranges, only 374 AU weighted separation, 1.0+0.9 Msol, and the radial velocity delta 0.5 is less than the escape velocity 3.0, so it is possible this is binary and an orbital solution should be tried.
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 726 AB: 178; 300x: Very fine, more than a slight delta mag, nice clean split, seen as double lower power best seen with higher powers. WDS uncertain, but there is -13% parallax range overlap, it is not likely binary.
05h 30m 51.75s +10° 15' 15.7" P.A. 264.00 sep 1.2 mag 7.90,8.59 Sp B9 dist. 4545.45 pc (14827.26 l.y.)

STF 820 AB: 178; 125x: Nearly 1 Dm, fairly wide separation, white stars.  WDS says parallax indicates physical, and there is 56% overlap of the parallax ranges, 2,232 AU weighted separation, 2.8+2.2 Msol, and the radial velocity delta 1.5 is less than the escape velocity 2.0, so it is likely binary and an orbital solution should be tried.
05h 55m 42.95s +08° 58' 57.9" P.A. 110.00 sep 5.1 mag 9.10,9.79 Sp G0

STF 664 AB: 178; 125x: White stars, noticeable delta mag, fairly wide.  WDS uncertain, but there is no overlap of the parallax ranges, -89%, it is not binary.

05h 15m 10.54s +08° 25' 56.8" P.A. 177.00 sep 4.8 mag 7.77,8.42 Sp A9IV dist. 120.19 pc (392.06 l.y.)

STF 678 AB: 178; 125x: 1 Dm, pretty close but still easy at low power.  WDS uncertain, but there is 63% overlap of the parallax ranges, only 696 AU weighted separation, 1.7+1.6 Msol, and the radial velocity delta 0.3 is less than the escape velocity 2.9, so this is likely binary and an orbital solution is needed.
05h 17m 39.01s +04° 41' 01.8" P.A. 104.00 sep 3.6 mag 9.11,9.44 Sp F0 dist. 173.01 pc (564.36 l.y.)

STF 682 AB 178; 125x: B is faint but still seen directly, >1 Dm, wide.  WSS says proper motion indicates not physical, but there is no overlap -56% of the parallax ranges, it is not binary.
05h 18m 41.36s +03° 58' 54.0" P.A. 118.00 sep 16.1 mag 9.30,10.52 Sp F8 dist. 53.62 pc (174.91 l.y.)

STF 627 AB: 178; 125x: Equal white stars, pretty wide.  WDS uncertain, but there is no overlap of the parallax ranges, -8%, it is not binary.

05h 00m 33.93s +03° 36' 56.8" P.A. 260.00 sep 21.2 mag 6.59,6.95 Sp B9Vn+B9Vn dist. 34.15 pc (111.4 l.y.)

STF 628 AB: 178; 125x: >1 Dm, B is faint but seen directly, wide.  WDS uncertain, but there is no overlap of the parallax ranges, -12%, they are not binary.
05h 00m 39.79s +03° 15' 55.2" P.A. 48.00 sep 22.8 mag 8.13,9.85 Sp B9 dist. 221.73 pc (723.28 l.y.)

STF 654 AB: 178; 125x: Very pretty bright yellow A and dull white B, well separated.  WDS uncertain, and sadly there is no overlap of the parallax ranges, -76%, it is not binary.
05h 13m 17.48s +02° 51' 40.5" P.A. 65.00 sep 6.4 mag 4.62,8.50 Sp K2II dist. 107.3 pc (350.01 l.y.)

STF 630 A-BC: 178; 125x: Slight delta, wide, white stars.  WDS uncertain, but there is no overlap of the parallax ranges, -90%, it is not binary.
05h 02m 00.03s +01° 36' 31.9" P.A. 49.00 sep 14.4 mag 6.50,7.71 Sp B8V dist. 187.27 pc (610.87 l.y.)

STF 614 AB-C: 178; 125x: Faint near equal white stars, fairly close, nice.  WDS says not physical, and there is no Gaia parallax data for the secondary.
04h 55m 03.88s -00° 32' 42.0" P.A. 70.00 sep 4.4 mag 9.07,9.50 Sp A5

STF 639 AB: 178; 125x: Slight delta mag, white wide stars.  WDS says it's physical, but there's no overlap of the parallax ranges, -77%, it is not binary.
05h 04m 01.26s -02° 51' 28.0" P.A. 81.00 sep 5.5 mag 8.67,9.48 Sp F0 dist. 139.86 pc (456.22 l.y.)

STF 762 AB-C: 178; 200x: Sigma Orionis, a 16-fold system.  This the bright main star and one of the fainter outliers.  The five main stars seen.  
05h 38m 44.77s -02° 36' 00.2" P.A. 239.00 sep 11.4 mag 3.76,8.79 Sp +A2V dist. 328.95 pc (1073.03 l.y.)

STF 744 AB: 178; 125x: 2 Dm B just barely seen directly, fairly wide.  WDS says this is physical, but there is no overlap of the parallax ranges, -21%, it is 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 817 AB: 178; 125x: Fairly wide near equal white stars.  WDS says proper motion indicates physical, but there is no overlap of the parallax ranges, -32%, it is not binary.
05h 54m 51.96s +07° 01' 53.8" P.A. 73.00 sep 18.6 mag 8.68,8.93 Sp A5+K

STF 816 AB: 178; 125x: Attractive white A and dull white, 3 Dm B, well split.  WDS uncertain, but there is no overlap of their parallax ranges, -82%, 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 815 AB; 178; 125x: 1 Dm wide pair, unremarkable.  WDS says it's physical, and there is 12% overlap of the parallax ranges, 4,227 AU weighted separation, 2.7+1.6 Msol, but the radial velocity delta 2.7 exceeds the escape velocity 1.3, they are not 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 818 AB: 178; 125x: Equal, well separated.  WDS says this is physical but that's wrong (again!).  They don't share their parallax ranges, -82%, they are not binary.
05h 55m 19.45s +04° 42' 49.8" P.A. 278.00 sep 5.9 mag 9.84,10.06 Sp K0

STF 797 AB: 178; 125x: 1 Dm, pretty wide.  WDS uncertain, but they share 62% overlap of their parallax ranges, 1,380 AU weighted separation, 2.4+1.4 Msol, and the radial velocity delta 1.9 is less than the escape velocity 2.2, so they are likely binary, and an orbital solution should be tried.
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.)

STF 789 AB: 178; 125x: 2 Dm, pretty wide.  WDS says it is not physical, and there is no parallax range overlap, -83%, they are not binary.
05h 45m 01.80s +04° 00' 29.3" P.A. 150.00 sep 14.0 mag 6.13,10.17 Sp gF0n dist. 58.86 pc (192 l.y.)

STF 788 AB: 178;125x.  Triple.  Bright 7th magnitude A with 10th magnitude B well separated, and fainter wider C. WDS uncertain, there is 12% overlap of the parallax ranges, 1,967 AU weighted separation, 2.7+1.6 Msol, and the radial velocity delta 1.7 is less than the escape velocity 2.0, so there is some chance they are 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 729 AB; 178; 250x: Very fine split, 1 Dm.  WDS uncertain, but there is 47% overlap of the parallax ranges with 3% error, only 624 AU weighted separation, 4.6+3.7 Msol, so there's a good chance it's binary and needs an orbital solution.
05h 31m 14.53s +03° 17' 31.7" P.A. 26.00 sep 1.8 mag 5.71,6.74 Sp B1.5V dist. 348.43 pc (1136.58 l.y.)

STF 696 AB: 178; 125x: Slight delta mag, wide, white A and blue B.  WDS says parallax indicates physical, but there is no overlap of the parallax ranges (!) -27%, it is not binary.
05h 22m 50.00s +03° 32' 40.0" P.A. 29.00 sep 32.0 mag 4.95,6.76 Sp B1V dist. 476.19 pc (1553.33 l.y.)

STF 721 A-BC: 178; 125x: White A, 2 Dm wide B.  WDS says it's not physical, and there is no Gaia parallax for the secondary.
05h 29m 33.52s +03° 08' 52.5" P.A. 149.00 sep 25.3 mag 7.09,9.14 Sp B5V

STF 712 AB: 178; 125x: White stars, >1 Dm, nice close split.  WDS uncertain, there is 7% overlap of the parallax ranges, only 508 AU weighted separation, 2.6+1.7 Msol, so it might be binary and needs an orbital solution.
05h 26m 31.22s +02° 56' 09.3" P.A. 66.00 sep 3.2 mag 6.70,8.59 Sp B9.5V dist. 145.77 pc (475.5 l.y.)

STF 702 AB: 178; 125x: Faint near equal.  WDS says proper motion indicates physical.  There is 5% overlap of the parallax ranges, 2,885 AU weighted separation, 2.0+1.7 Msol, and the radial velocity delta 0.5 is less than the escape velocity 1.5, so it is possible to be binary and needs an orbital solution.
05h 24m 17.61s +02° 22' 04.6" P.A. 80.00 sep 8.3 mag 9.60,10.10 Sp A0

STF 756 AB: 178; 125x: 1 Dm, fairly wide.  WDS says it's physical, and there is 98% overlap of the parallax ranges, 6,991 AU weighted separation, 2.3+1.6 Msol, so it is likely binary and needs an orbital solution tried.
05h 37m 38.44s +02° 19' 17.5" P.A. 237.00 sep 23.8 mag 8.68,9.98 Sp A0 dist. 452.49 pc (1476.02 l.y.)

STF 708 AB: 178; 200x: Fine pair, nearly 1 Dm, close split.  WDS uncertain, but there is 34% overlap of the parallax ranges, 1,288 AU weighted separation, 2.7+3.5 Msol, so there is a chance it is binary and an orbital solution should be tried.

05h 25m 11.28s +01° 55' 26.1" P.A. 321.00 sep 2.8 mag 7.74,8.90 Sp B8V dist. 543.48 pc (1772.83 l.y.)

STF 700 AB: 178; 200x: Near equal white stars, nice close separation.  WDS uncertain, but there is no overlap -50% of the parallax ranges, they are not binary.
05h 23m 05.54s +01° 03' 24.7" P.A. 4.00 sep 4.8 mag 7.69,7.89 Sp B9V+B9.5V dist. 232.02 pc (756.85 l.y.)

STF 782 AB; 178; 125x: Near equal very wide.  WDS says it's not physical, and there is no overlap -91% of the parallax ranges, they are not binary.
05h 42m 55.94s +00° 01' 28.7" P.A. 305.00 sep 47.4 mag 8.60,8.83 Sp K0

STF 741 AB: 178; 125x: 1 Dm wide, unremarkable.  WDS uncertain, but there is no overlap of the parallax ranges, -23%, they are not binary.
05h 34m 56.49s -00° 07' 22.3" P.A. 286.00 sep 10.0 mag 7.14,10.03 Sp B5

STF 758 AB: 178; 300x: Very excellent close pair, split with lower magnifications but best with high power, with other similar magnitude pairings in an arc.  Sits above Orion's belt.  WDS uncertain, and surprisingly they do not share parallax ranges, -35% overlap, they are not binary.
05h 38m 06.52s -00° 11' 03.5" P.A. 242.00 sep 1.5 mag 7.96,8.33 Sp B6V

STF765 = STF757 7.9/8.3 1.5" 

STF 757 AB: = STF 758 AB