16 december 2022, binaries

Observed with the 20-inch in fairly good seeing. I logged around 17- objects, all from the known-binary list, but the laptop I use and which has the logs died, so I don't have many to report except for the short periods where I wrote the observations down in my notebook. The rest will have to wait for a new laptop to arrive and the software recovery.

HU 304 AB: 508; 850x: Suspected not single at lower powers, the equal white stars was a clean split at 850x on up through 1270x, with apodizing mask. I could not tell which star was brighter, but the position angle was following a NE-SW line. It gave me less trouble than I expexted since brighter pairs throw off a lot of diffraction. Pretty cool that this pair, discovered in 1901 at 0.3" and with a 54.7-year period, has made a little more than two complete revolutions to be resolved visually again.  WDS grade 2 orbit, no reason to doubt it, and anyway there's no Gaia parallax data available.
04h 23m 51.84s +09° 27' 39.5" P.A. 38.30 sep 0.31" mag 5.80,5.90 Sp A0V+A1V dist. 121.36 pc (395.88 l.y.)

BU1007 AB: 508; 1270x: Snowman, 1 Dm, very tough, broken up with diffraction, PA to the south.  Actual PA more WSW, and a WDS grade 2 orbit 111.02-year period.  No Gaia data for the secondary.  This will become undetectible until the late 2050s.  Burnham writes: "Discovered with the 12-inch on Mt. Hamilton in 1881.  It was single or too close for the 36-inch 1890-92.  The measures since then show but little change in the angle, but a while revolution may be covered by the observations.  The components are nearly equal, and therefore some of the measures may require a correction 180 degrees.  In my measure with the 40-inch in 1897 it was noted: 'The distance is less than 0.3"; the smaller star is p.'  In the first set of measures in 1881 with the 12-inch it was stated: 'The measured distances are decidely too large.'  The distance is probably always less than 0.25".  There is little double of its being a binary of short period."  

05h 41m 17.72s +16° 32' 03.1" P.A. 255.90 sep 0.124" mag 5.04,6.56 Sp B8V+B7V dist. 194.93 pc (635.86 l.y.)

STT 79 AB: 508; 570x: Very pretty light orange primary, grey-blue B, 1 Dm, nice close split, PA to north.  WDS grade 2 orbit, 89.7-year period, no Gaia data for the secondary.  This will widen slightly and be more firmly to the northeast by 2040.

04h 19m 54.78s +16° 31' 21.6" P.A. 15.80 sep 0.679" mag 7.26,8.62 Sp F9V dist. 46.53 pc (151.78 l.y.)

I made an attempt at A3010, and thought I had an elongation with north-south PA, but it is really to the east and I obviously did not have it. Discovered in 1901 at 0.1", it has an extrodinary fast 1.19-year period with a grade 3 orbit. The nice thing is this will be at apistron just next year, so I can certainly give it another go.

23 november 2022 struves

Set up with the 20-inch but the seeing did not live up to expectations, likely because of all the ground cooling after a relatively warm day.  Masked down to 7-inches and covered some ground in and around Pisces.  Observed from 8-11pm, so a lot covered.

STF 24 AB: 178; 140x: White stars, well separated, 1 Dm.  WDS claims it is physical, and while there is only 752 AU weighted separation, 2.0+1.7 Msol, and the radial velocity delta 0.5 is less than the escape velocity 2.9, it may not be binary as the parallax ranges do not overlap, -22%.
00h 18m 30.59s +26° 08' 25.1" P.A. 247.00 sep 5.0 mag 7.79,8.44 Sp A2 dist. 154.8 pc (504.96 l.y.)

STF 17 AB: 178; 140x: Near equal wide pair.  WDS says it's physical, and while there is 18% parallax range overlap, it has a very wide 9,119 AU weighted separation, 2.8+1.8 Msol, and the radial velocity delta 2.6 is much more than the escape velocity 0.9, so it is not binary.
00h 16m 32.03s +29° 17' 36.6" P.A. 29.00 sep 26.7 mag 8.39,9.83 Sp K0

STF 73 AB: 178; 285x: Near equal, yellow-white A and blue-white B, well separated.  WDS grade 2 orbit, 167.5-year period, it is NNW now, and will reach due N by 2045.  No Gaia parallax data.  
00h 54m 58.02s +23° 37' 42.4" P.A. 335.60 sep 1.2 mag 6.12,6.54 Sp K1IV dist. 37.98 pc (123.89 l.y.)

STF 49 AB: 178; 145x: White A and 3 Dm yellow B, well separated.  WDS uncertain, but there is 62% overlap of the parallax ranges, only 228 AU weighted separation, 1.0+0.6 Msol, and the radial velocity delta 2.0 is less than the escape velocity 3.5, so it is very likely binary and needs an orbit.
00h 40m 47.49s -07° 13' 57.5" P.A. 320.00 sep 8.6 mag 7.12,9.98 Sp G1V dist. 26.5 pc (86.44 l.y.)

STF 35 AB: 178; 145x: Faint pair, nearly 1 Dm, fairly well separated.  WDS says not physical, but there is 9% parallax range overlap, only 862 AU weighted separation, 0.9+0.8 Msol, and the radial veloctiy delta 0.3 is less than the escape velocity 1.9, so it might be binary and needs another orbit try.
00h 31m 36.57s -02° 02' 21.2" P.A. 267.00 sep 8.8 mag 10.50,10.87 Sp K0

STF 14 AB: 178; 145x: Wide 2 Dm.  WDS says parallax indicates non-physical, but in fact there is 32% overlap of the parallax ranges, a pretty wide 4,138 AU weighted separation, 2.1+1.4 Msol, and the radial velocity delta 1.4 is a bit more than the escape velocity 1.2.  There is some possibility it is binary and needs to be checked.
00h 15m 48.93s -11° 59' 24.7" P.A. 237.00 sep 14.5 mag 8.90,10.85 Sp A0V dist. 1724.14 pc (5624.14 l.y.)

STF3065 AB: 178; 145x: Wide, 1 Dm, faint pair.  WDS says proper motion indicates physical, but there is no overlap of the parallax ranges, -35%, it is not binary.

00h 07m 59.24s -14° 13' 37.0" P.A. 290.00 sep 9.7 mag 9.58,9.64 Sp G0 dist. 108.7 pc (354.58 l.y.)

STF 5 AB: 178; 145x: Very pretty white A and well separated 3 Dm B.  WDS uncertain, but there is -18% overlap of the parallax ranges, is it not binary.
00h 10m 02.18s +11° 08' 44.9" P.A. 159.00 sep 7.6 mag 5.54,9.44 Sp B9Vn dist. 93.63 pc (305.42 l.y.)

STF 4 AB: 178; 145x: Near equal white stars, well separated.  WDS says proper motion indicates physical, and there is 70% parallax range overlap, 369 AU weighted separation, 1.0+1.0 Msol, and the radial velocity delta is 0, escape velocity 3.0, so it certainly is binary and needs an orbit.
00h 09m 51.65s +08° 27' 11.4" P.A. 276.00 sep 5.2 mag 9.51,9.60 Sp G6V+G7V dist. 76.28 pc (248.83 l.y.)

STF 8 AB: 178;145x: White A and 2 Dm B, well separated.  WDS uncertain, but there is -78% parallax range overlap, it is not binary.
00h 11m 35.21s -03° 04' 40.9" P.A. 291.00 sep 7.8 mag 7.84,9.26 Sp F8 dist. 129.2 pc (421.45 l.y.)

STF 15 AB: 178; 145x: White A and 3 Dm B, well split.  WDS uncertain, but there is 58% overlap of the parallax ranges, only 938 AU weighted separation, 2.5+1.4 Msol, and the radial velocity is equal to the escape velocity 2.7 -- it might be binary and needs an orbit.
00h 15m 51.62s -05° 36' 04.2" P.A. 199.00 sep 4.7 mag 7.71,9.83 Sp G5 dist. 213.68 pc (697.02 l.y.)

STF 23 AB: 178; 145x: White A and 2 Dm wide B.  WDS says not physical, and there is -97% overlap of the parallax ranges, it is not binary.
00h 17m 28.76s +00° 19' 15.5" P.A. 216.00 sep 10.5 mag 7.88,10.28 Sp F8 dist. 125.16 pc (408.27 l.y.)

STF 21 AB: 178; 145x: Faint pair, significant delta, easily separated.  Lies in an attractive triangle of brighter whte stars.  WDS says proper motion indicates physical, and there is 30% parallax range overlap, 1,344 AU weighted separation, 1.2+1.1 Msol, and the radial velocity delta 0.5 is less than the escape velocity 1.8, so it is likely binary and needs an orbit.
00h 17m 21.25s +02° 20' 50.6" P.A. 52.00 sep 7.7 mag 10.31,10.60 Sp G0

STF 25 AB: 178; 285x: Faint near equal stars, closely split.  Nice!  WDS uncertain, but there is -49% overlap of the parallax ranges, it is not binary.
00h 18m 42.80s +15° 59' 26.5" P.A. 196.00 sep 1.0 mag 9.31,9.55 Sp F5 dist. 167.5 pc (546.38 l.y.)

STF 46 AB: 178; 145x: Fine pair, light orange A and blue B, wide, 2 Dm.  WDS says physical, and there is 23% overlap of the parallax ranges, only 877 AU weighted separation, 3.4+1.5 Msol, so it is likely binary and needs an orbit.
00h 39m 55.57s +21° 26' 18.6" P.A. 195.00 sep 6.6 mag 5.56,8.49 Sp K0III+F3V dist. 127.06 pc (414.47 l.y.)

STF 37 AB: 178; 145x: Faint white stars, near equal, well split.  WDS says they're physical, but there is no overlap of the parallax ranges, -88%, they are not binary.
00h 32m 21.84s +15° 39' 17.3" P.A. 247.00 sep 6.9 mag 10.55,10.74 Sp K0

STF 51 AB: 178; 145x: Nice pair, light yellow A and light blue B, closely separated.  WDS uncertain, but there is 47% overlap of the parallax ranges, only 258 AU weighted separation, 1.2+0.9 Msol, and the radial velocity delta 1.3 is less than the escape velocity 3.8, it is very likely binary and needs an orbit.
00h 43m 33.15s +17° 21' 21.1" P.A. 125.00 sep 3.6 mag 8.33,10.40 Sp F8

STF 61 AB: 178; 145x: Brilliant white stars, near equal, easy separation.  WDS says it's physical, and there is 5% parallax range overlap, only 382 AU weighted separation, 2.2+2.2 Msol, but the radial velocity delta 5.7 exceeds the escape velocity 4.5, it is not binary.
00h 49m 52.88s +27° 42' 38.9" P.A. 115.00 sep 4.4 mag 6.33,6.34 Sp F5III dist. 88.57 pc (288.92 l.y.)

STF 77 AB: 178; 145x: Dual 10th magnitude stars, around 10" separation.  WDS says it's physical, and there is 5% parallax range overlap, 3077 AU weighted separation, 1.6+1.6 Msol, and the radial velocity delta 0.2 is less than the escape velocity 1.4, so it is likely binary and needs an orbit.
00h 58m 06.76s +26° 55' 22.2" P.A. 119.00 sep 10.4 mag 10.35,10.45 Sp G

STF 67 AB: 178; 200x: 1 Dm, very closely split.  WDS grade 4 orbital solution, 4100-year period.  In spite of the mere 232 AU weighted separation and 1.3+1.2 Msol, there is no overlap of the parallax ranges, -25%, it is not binary.
00h 52m 07.59s +10° 36' 03.7" P.A. 350.00 sep 2.3 mag 8.98,9.56 Sp F8 dist. 98.62 pc (321.7 l.y.)

STF 71 AB: 178; 145x: >1 Dm, very well split.  WDS says it's physical, but there's no overlap of the parallax ranges, -68%, it is not binary.
00h 53m 19.07s +05° 00' 18.4" P.A. 339.00 sep 8.9 mag 9.30,10.56 Sp F2 dist. 653.59 pc (2132.01 l.y.)

STF 74 AB: 178: 250x: Very close split, 1 Dm, with seeing.  WDS uncertain, but there is -93% parallax range overlap, it is not binary.
00h 54m 45.19s +09° 25' 43.6" P.A. 298.00 sep 3.1 mag 8.57,9.60 Sp F0 dist. 189.39 pc (617.79 l.y.)

STF 76 AB: 178; 200x: Difficult, very closely split B, 2 Dm, with averted vision only.  WDS uncertain, but there is -84% overlap of the parallax ranges, it is not binary.
00h 56m 35.89s +10° 40' 24.8" P.A. 199.00 sep 3.0 mag 9.10,11.80 Sp A2

STF 75 AB: 178; 145x: Faint pair, B seen with averted vision at first then direct, closely separated.  WDS says it is physical, and there is 8% overlap of the parallax ranges, 661 AU weighted separation, 1.2+0.9 Msol, and the radial velocity delta 1.3 is less than the escape velocity 2.4, so it is likely binary and needs an orbit.
00h 55m 07.79s +13° 32' 58.5" P.A. 273.00 sep 5.2 mag 9.60,11.27 Sp G5 dist. 101.73 pc (331.84 l.y.)

STF3063 AB: 178; 200x: Very faint pair, difficult, significant delta magnitude, with seeing only.  WDS grade 5 orbit 688-year period.  But, there is no overlap of the parallax ranges, -65%, it is not binary, in spite of the mere 71 AU weighted separation!
00h 07m 35.68s -04° 32' 51.1" P.A. 192.00 sep 1.0 mag 9.30,10.29 Sp G0

STF 202 AB: 178; 145x: = Alrisha.  Remarkable pair, white, huge delta magnitude, fairly easy, only 150 light years distant.  WDS grade 4 orbital solution, 1946-year period.  Unfortunately there is no Gaia parallax data. 

02h 02m 02.80s +02° 45' 49.4" P.A. 260.50 sep 1.9 mag 4.10,5.17 Sp A0p+A3m dist. 46.17 pc (150.61 l.y.)

STF 99 AB: 178; 145x: Bright yellow A, B is faint and fairly wide.  WDS uncertain, but there is 45% overlap of the parallax ranges, only 922 AU weighted separation, 3.9+1.1, so it is likely binary and needs an orbit.
01h 13m 44.94s +24° 35' 01.6" P.A. 227.00 sep 7.5 mag 4.65,9.11 Sp G8III dist. 136.8 pc (446.24 l.y.)

STF 87 AB: 178; 145x: White, 1 DM, wide.  WDS says proper motion indicates physical, but there is no overlap of the parallax ranges, -63%, they are not binary.
01h 05m 29.91s +15° 23' 24.2" P.A. 204.00 sep 6.0 mag 9.24,9.93 Sp K3.5V+K8V dist. 26.43 pc (86.21 l.y.)

STF 82 AB: 178; 200x: Fairly faint pair, 1 Dm, closely split.  WDS uncertain, but there is 5% overlap of the parallax ranges, 675 AU weighted separation, 2.5+2.0 Msol, so there is some possibility it is binary and needs an orbit.
01h 00m 41.73s +09° 29' 12.8" P.A. 304.00 sep 1.9 mag 8.78,9.71 Sp F0 dist. 202.84 pc (661.66 l.y.)

STF 78 AB: 178; 145x: Faint pair, near equal, white, well separated.  WDS says it's physical, and there's 15% overlap of the parallax ranges, 1,373 AU weighted separation, 1.6+1.5 Msol, and the radial velocity delta 0.3 is less than the escape velocity 2.0, so it is probably binary and needs an orbit.
00h 59m 05.48s +05° 22' 55.0" P.A. 245.00 sep 5.0 mag 10.25,10.47 Sp F8

STF 100 AB: 178; 145x: Bright pair, wide, A is light yellow, 1 Dm.  WDS says proper motion indicates physical, but there is just 1% overlap of the parallax ranges, 930 AU weighted separation, 1.9+1.5 Msol, so there is a small chance it is binary and needs a try at the orbit.
01h 13m 43.80s +07° 34' 31.8" P.A. 64.00 sep 23.1 mag 5.22,6.26 Sp A7IV+F7V dist. 53.3 pc (173.86 l.y.)

STF 119 AB: 178; 145x: Faint pair, wide, 1 Dm.  WDS says it's physical, and there is 37% overlap of the parallax ranges, 1,826 AU weighted separation, 1.1+0.8 Msol, and the radial veloctiy delta 1.0 is less than the escape velocity 1.4, so it is very likely binary and needs an orbit.
01h 24m 29.77s +05° 11' 39.7" P.A. 149.00 sep 13.7 mag 10.12,12.30 Sp G0

STF 122 AB: 178; 145x: Blue A and wide 3 Dm B.  WDS uncertain, but there is no overlap of the parallax ranges -24%, it is not binary. 
01h 26m 53.55s +03° 32' 08.3" P.A. 329.00 sep 5.7 mag 6.65,9.51 Sp B9V+A8V dist. 166.11 pc (541.85 l.y.)

STF 138 AB: 178; 145x: Very pretty light yellow stars, near equal, closely split.  WDS uncertain, but there is no overlap of the parallax ranges, -25%, it is not binary.
01h 36m 02.86s +07° 38' 42.9" P.A. 60.00 sep 1.7 mag 7.50,7.63 Sp F6V dist. 76.05 pc (248.08 l.y.)

STF 129 AB: 178; 145x: Faint 1 Dm, wide.  WDS says it's physical, and there is 29% overlap of the parallax ranges, 3,124 AU weighted separation, 2.0+1.8 Msol, and the radial velocity delta 0.5 is less than the escape velocity 1.5, so it is likely binary and needs an orbit.
01h 30m 16.52s +12° 38' 57.7" P.A. 282.00 sep 8.9 mag 9.71,10.25 Sp F0 dist. 1538.46 pc (5018.46 l.y.)

STF 132 AB: 178; 145x: Bright white star in the center of a pretty chevron asterism of faint near equal stars.  WDS says proper motion indicates not physical, and there is no overlap of the parallax ranges, -90%, it is not binary.
01h 32m 03.12s +16° 56' 50.0" P.A. 342.00 sep 63.8 mag 6.88,10.61 Sp K0III dist. 57.74 pc (188.35 l.y.)

STF 145 AB: 178; 145x: Bright white A and very faint, well separated B.  WDS uncertain, and there is no overlap of the parallax ranges, -43%, it is not binary.
01h 41m 18.30s +25° 44' 44.9" P.A. 31.00 sep 10.3 mag 6.25,10.90 Sp F6V dist. 54.95 pc (179.25 l.y.)

STF 155 AB: 178; 145: White, near equal, well split, at the tip of a backwqrds "C" asterism.  WDS says it's physical, and there is 81% overlap of the parallax ranges, only 353 AU weighted separation, 1.4+1.3 Msol, so it is likely binary and needs an orbit.

01h 44m 15.19s +09° 29' 02.7" P.A. 325.00 sep 4.9 mag 7.87,8.01 Sp F2 dist. 93.72 pc (305.71 l.y.)