Friday, March 1, 2024

8 february 2024 Monoceros Struves

Clear day and night, but with merely average transparency and slightly better seeing -- which seemed like a gift after so poor a season.  I observed the sun during the day, with the amazingly complex sunspot near the center of the disc (3576), very elongated and with an incredibly long and thin light bridge stretching along nearly the entire length.  Quite the sight.  Some nice prominences too.  I decided to start observing earlier in the evening, so I had about an hour before going into the house to wish the kids goodnight and take a short break.  Speaking of shorts, I seem to have one on my dew controller, as I burned through three fuses.  Fortunately, there wasn't much dew until the very end of the night, near 11pm, when a high thin haze started to spread across the sky.

STF 703 AB: 152; 125x: Extremely faint B seen averted vision only, wide.  -96% PRO, it is not binary.
06h 13m 08.25s +85° 36' 31.2" P.A. 57.00 sep 51.1 mag 9.19,11.85 Sp K5

STF 832 AB: 152; 125x: Faint B 1 Dm, averted vision only, wide.  Parallax data missing for the primary.
06h 01m 04.98s -14° 31' 22.1" P.A. 88.00 sep 24.7 mag 9.12,10.55 Sp F0V+A2Va

STF 841 AB: 152; 125x: B is very faint, averted vision only, well split.  -95% PRO, it is not binary.
06h 06m 10.75s +06° 28' 32.0" P.A. 15.00 sep 18.0 mag 9.44,12.24 Sp F8

STF 843 AB: 152; 125x: B is wide, very faint, averted vision needed to brighten, 2 Dm.  -92%PRO, it is not binary.
06h 05m 09.68s -14° 18' 34.0" P.A. 13.00 sep 24.0 mag 8.50,11.20 Sp K0III

STF 864 AC 152; 125x: Faint well split B, averted vision needed.  AB is J 1922, slightly unequal around 6" separation.  Lacks parallax data for the primary.
06h 10m 52.84s +20° 36' 33.7" P.A. 58.00 sep 22.1 mag 10.51,11.10 Sp B5+B

STF 869 AB: 152; 125x: Slightly unequal wide pair.  0% PRO, it is not likely binary.
06h 10m 44.34s -09° 51' 08.3" P.A. 280.00 sep 24.5 mag 8.18,9.09 Sp A8V+F8V

STF 870 AB: 152; 125x: Faint, slightly unequal white stars.  -95% PRO, it is not binary.
06h 13m 23.44s +14° 06' 27.1" P.A. 172.00 sep 11.0 mag 9.60,10.60 Sp G5IV

STF 875 AB: 152; 125x: Faint, well split B, just barely visible with direct vision.  -95% PRO, it is not binary.
06h 12m 08.71s -13° 08' 53.3" P.A. 323.00 sep 4.6 mag 9.19,10.38 Sp K0

STF 910 AB: 152; 125x: Super wide, 3 Dm. BC not seen, 0.5" and narrowed since discovery, it might be binary.  Parallax missing for the B companion.  
06h 26m 43.39s +00° 27' 15.2" P.A. 152.00 sep 66.0 mag 6.99,8.11 Sp G5 dist. 207.47 pc (676.77 l.y.)

STF 911 AB: 152; 125x: Near equal, wide.  -93% PRO, it is not binary.
06h 26m 52.75s +04° 04' 10.8" P.A. 155.00 sep 11.7 mag 8.65,9.04 Sp K0

STF 914 AB: 152; 125x: Wide, 2 Dm.  35% PRO, 2,436 AU WS, 2.4+1.3 Msol, but the RVD 2.2 > EV 1.6, it is not binary.
06h 26m 44.85s -07° 30' 43.0" P.A. 299.00 sep 21.1 mag 6.32,9.25 Sp A0Vn dist. 75.41 pc (245.99 l.y.)

STF 915 AB: 152; 125x: Well split, nearly 1 Dm.  A is V648 Mon.  -27% PRO, it is not binary.
06h 28m 13.96s +05° 16' 20.1" P.A. 43.00 sep 5.9 mag 7.60,8.52 Sp A1p dist. 269.54 pc (879.24 l.y.)

STF 919 AB: 60; 90x: Beta Mon. Crooked finger asterism three of near equal stars.  AB is closely but cleanly split.  Parallax data missing for B, but A and C have 77% PRO, 2,092 AU WS, 4.9+4.1 Msol, so if B is of overlapping parallax this would be a complex triple.  Would be good to have an orbit made.
06h 28m 49.07s -07° 01' 59.0" P.A. 133.00 sep 7.2 mag 4.62,5.00 Sp B4V+B2V dist. 207.47 pc (676.77 l.y.)

STF 920 AB: 152; 125x: Bright white A, wide B appears with averted vision, and I can hold it direct with foveal coaxing. 20% PRO, 6,342 AU WS, 4.6+2.3 Msol, it is possibly binary and an orbit should be tried.
06h 30m 29.22s +04° 19' 56.8" P.A. 210.00 sep 9.5 mag 7.35,10.24 Sp B2IV-V dist. 14285.71 pc (46599.99 l.y.)

STF 921 AB: 152; 125x: Wide, 3 Dm, white.  -41% PRO, it is not binary.
06h 31m 09.56s +11° 15' 05.0" P.A. 3.00 sep 16.2 mag 6.12,9.09 Sp B2V:nne dist. 303.03 pc (988.48 l.y.)

STF 926 AB: 152; 125x: Wide, unequal, white.  74% PRO, 2,444 AU WS, 2.7+1.8 Msol, it is possibly binary and an orbit should be tried.
06h 31m 40.54s +05° 46' 08.8" P.A. 287.00 sep 10.8 mag 7.23,8.62 Sp A1p dist. 71.38 pc (232.84 l.y.)

STF 927 AB: 152; 125x: Fairly close, B is faint, need averted vision to notice it.  -14% PRO, it is not likely binary.
06h 32m 07.33s +04° 58' 16.1" P.A. 85.00 sep 5.1 mag 9.16,10.30 Sp A3V

STF 930 AB: 152; 125x: Rich star field, many of which were pointlessly measured, since the parallax don't overlap.  AB is near equal, wide, -27% PRO and not binary.
06h 34m 09.26s +07° 59' 27.3" P.A. 277.00 sep 26.2 mag 8.38,9.87 Sp F8II dist. 223.71 pc (729.74 l.y.)

STF 931 AB: 152; 125x: In same field with STF930, wide 1 Dm.  -80% PRO, it is not binary.
06h 34m 20.10s +07° 59' 06.4" P.A. 23.00 sep 23.8 mag 9.64,10.51 Sp A2

STF 938 AB: 152; 125x: In same field with STF930.  Wide, 3 Dm, B seen with averted vision.  -41% PRO, it is not binary.
06h 34m 46.33s +07° 34' 21.0" P.A. 211.00 sep 11.0 mag 6.45,10.60 Sp A0Vs dist. 115.47 pc (376.66 l.y.)

STF 939 AB: 152; 125x: Very pretty asterism, forms one of an equal triangle of near equal stars.  AB -67% PRO, BC 26% PRO but the WS is 27,981 AU, far too apart to be binary.
06h 35m 55.14s +05° 18' 35.2" P.A. 107.00 sep 30.3 mag 8.39,9.20 Sp B1III dist. 621.12 pc (2026.09 l.y.)

STF 950 AB: 152; 125x: Nice cluster of a dozen near equal stars in a rough triangle asterism.  A bright star in the middle of the asterism has a close 2 Dm companion.  -15% PRO, it is not binary.
06h 40m 58.66s +09° 53' 44.7" P.A. 214.00 sep 3.0 mag 4.66,7.79 Sp O7Ve+B2: dist. 281.69 pc (918.87 l.y.)

STF 951 AB: 152; 125x: In the same field with STF950, wide 2 Dm.  No parallax or proper motion for the secondary. 
06h 40m 38.37s +09° 47' 16.0" P.A. 310.00 sep 21.3 mag 8.49,10.91 Sp B3Vnn

STF 952 MN: 152; 125x: Near equal, wide.  86% PRO, but a very wide 10,414 AU WS, 2.7+2.6 Msol might be enough to bind them, so it should be checked with an orbit.
06h 41m 10.38s +09° 53' 01.7" P.A. 116.00 sep 14.1 mag 9.75,10.05 Sp B9

STF 955 AB: 152; 125x: Near equal, wide.  3% PRO with 3% error, 967 AU WS, 3.5+3.0 Msol, it should be checked with an orbit.
06h 41m 10.25s -07° 59' 26.1" P.A. 268.00 sep 1.2 mag 8.97,9.59 Sp B9

STF 956 AB: 125x: Excellent pair, the delicate close companion seen with low power, and actually disappeared at 150x, very fine and small.  -89% PRO, it is not binary.
06h 42m 40.55s +01° 42' 58.2" P.A. 194.00 sep 6.9 mag 7.96,10.69 Sp O8.5V dist. 1030.93 pc (3362.89 l.y.)

STF 965 AB: 152; 125x: Very lovely close pair, faint B is 1 Dm. There is a wide plus one star (AD), nearly same magnitude as B.  -21% PRO, it is not binary.
06h 47m 16.12s +10° 54' 59.0" P.A. 346.00 sep 6.0 mag 8.92,10.50 Sp G0

STF 967 AB: 152; 125x: B seen averted vision only, wide. -85% PRO, it is not binary.
06h 46m 46.53s -06° 08' 41.2" P.A. 190.00 sep 13.0 mag 8.35,11.24 Sp A0 dist. 269.54 pc (879.24 l.y.)

STF 969 AB: 152; 125x: 1 Dm, well split.  -25% PRO, it is not binary.
06h 47m 57.37s -11° 06' 30.4" P.A. 317.00 sep 7.4 mag 7.80,9.83 Sp B9 dist. 483.09 pc (1575.84 l.y.)

STF 985 AB: 152; 125x: Slightly unequal, wide.
06h 53m 56.06s -04° 23' 32.8" P.A. 323.00 sep 32.6 mag 7.78,8.39 Sp K5 dist. 540.54 pc (1763.24 l.y.)

STF 986 AB: 152; 125x: Lovely unequal pair, well split, part of a long arc asterism of six stars.  84% PRO, 881 AU WS, 1.9+1.5 Msol, it is possibly binary and needs an orbit.
06h 54m 54.08s +09° 29' 56.5" P.A. 163.00 sep 5.5 mag 8.26,9.02 Sp A2

STF 987 AB: 152; 125x: Nice close split, seen with 125x but better at 200x, white, near equal.  47% PRO, only 265 AU WS, 2.5+2.7 Msol, it is likely binary and needs an orbit.
06h 54m 08.59s -05° 51' 08.6" P.A. 177.00 sep 1.4 mag 7.07,7.20 Sp A6Vn dist. 163.67 pc (533.89 l.y.)

STF 988 AB: 152; 125x: Wide, near equal.  41% PRO, 18,886 AU WS, 2.5+2.5 Msol, it is very far away to be binary, but an orbit should be tried.
06h 53m 59.18s -10° 02' 12.8" P.A. 265.00 sep 33.2 mag 9.43,9.69 Sp A2

STF 989 AB: 152; 125x: Near equal, well split.  -81% PRO, it is not binary.
06h 54m 47.88s +03° 33' 31.7" P.A. 215.00 sep 8.6 mag 9.74,10.60 Sp K0

STF 992 AB: 152; 125x: Slightly unequal, wide.  40% PRO, 1,317 AU WS, 1.3+1.0 Msol, it is possibly binary and an orbit should be tried.
06h 55m 37.68s -09° 29' 23.0" P.A. 300.00 sep 13.9 mag 8.70,9.91 Sp G0 dist. 91.24 pc (297.62 l.y.)

STF 995 AB: 152; 125x: Superwide, equal.  -79% PRO, it is not binary.
06h 57m 12.90s +11° 00' 36.7" P.A. 293.00 sep 21.8 mag 9.68,10.44

STF 998 AB: 152; 125x: Very nice close white pair.  27% PRO, 876 AU WS, 2.2+2.1 Msol, it is possibly binary and an orbit should be tried.
06h 56m 52.88s -05° 28' 44.6" P.A. 211.00 sep 3.2 mag 8.71,8.92 Sp A5 dist. 1162.79 pc (3793.02 l.y.)

STF 999 AB: 152; 125x: Listed in WDS as XMI 31.  1 Dm, wide.  -82% PRO, it is not binary.
06h 56m 44.52s -09° 00' 55.6" P.A. 309.00 sep 22.2 mag 9.00,11.40 Sp B7V

STF1003 AB: 152; 125x: Very delicate faint equal pair, close split at 125x.  6% PRO, 1,284 AU WS, 2.0+1.8 Msol, there is some possibility it's binary, an orbit should be tried.
06h 58m 34.62s -09° 10' 02.3" P.A. 321.00 sep 3.9 mag 9.57,9.92 Sp F2

STF1010 AC: 152; 125x: Equal, wide.  -78% PRO, it is not binary.
07h 01m 27.05s -03° 07' 03.3" P.A. 7.00 sep 22.3 mag 7.68,8.77 Sp O8.5IV dist. 49.68 pc (162.06 l.y.)

STF1015 AB: 152; 125x: Faint equal pair, well separated. -33% PRO, it is not binary.
07h 04m 55.36s -05° 46' 28.4" P.A. 199.00 sep 4.9 mag 9.41,9.40 Sp A0

D 12 AB: 152; 125x: Fairly bright A, 2 Dm B, rather wide.  90% PRO, 7,201 AU WS, 7.2+2.9 Msol, it is likely binary and needs an orbit.
07h 05m 49.64s -10° 39' 36.3" P.A. 282.00 sep 6.4 mag 6.51,10.08 Sp B0.5V dist. 14285.71 pc (46599.99 l.y.)

STF1019 AC: 152; 125x: Fairly bright A, 2 Dm B, very wide.  13% PRO, 40,336 AU WS, 7.2+3.3 Msol, is is not likely binary due to the wide weighted separation, but an orbit should be tried all the same.
07h 05m 49.64s -10° 39' 36.3" P.A. 292.00 sep 38.2 mag 6.51,9.55 Sp B0.5V dist. 14285.71 pc (46599.99 l.y.)

STF1028 AB: 152; 125x: Wide, equal.  32% PRO, 11,464 AU WS, 4.8+2.6 Msol, but the RVD 3.5 > EV 1.1, it is not binary.
07h 08m 16.08s -10° 37' 25.8" P.A. 303.00 sep 11.0 mag 8.59,11.10 Sp G5

STF1029 AB: 152; 125x: Near equal, hairline split with 125x, better seen 150x, light yellow-orange stars. 79% PRO, 337 AU WS, 2.5+2.2 Msol, it is likely binary and needs an orbit.
07h 07m 56.87s -04° 40' 39.8" P.A. 26.00 sep 1.6 mag 7.47,7.95 Sp A9V dist. 225.23 pc (734.7 l.y.)

STF1030 AB: 152; 125x: Wide equal stars.  -92% PRO, it is not binary.
07h 08m 48.92s -08° 40' 36.6" P.A. 45.00 sep 15.8 mag 8.52,9.87 Sp K2III dist. 699.3 pc (2281.12 l.y.)

STF1034 AB: 152; 200x: Very fine, split 125x but better seen 200x, equal white stars, part of a rectangle asterism with of three other stars of similar magnitude, slightly fainter than STF1034A.  7% PRO, 281 AU WS, 1.3+1.1 Msol, there is a slim chance it is binary, an orbit should be tried.
07h 09m 21.70s -08° 18' 58.4" P.A. 9.00 sep 2.4 mag 9.43,9.89

STF1036 AB: 152; 125x: Slightly unequal, wide, white.  -96% PRO, it is not binary.
07h 10m 12.63s -06° 16' 42.9" P.A. 102.00 sep 17.4 mag 9.22,9.92 Sp F5

STF1043 AB: 152; 150x: Exquisite close split of equal white stars.  Forms the tip of a wide triangle asterism of similar magnitude stars.  Nice rich field.  84% PRO, 977 AU WS, 2.3+2.3 Msol, it is likely binary and needs an orbit.
07h 12m 36.98s -00° 40' 46.4" P.A. 68.00 sep 2.4 mag 9.37,9.42 Sp A0

STF1045 AB: 152; 125x: Well split, 1 Dm.  -96% PRO, it is not binary.
07h 12m 42.24s -03° 10' 41.0" P.A. 236.00 sep 5.6 mag 8.01,9.08 Sp F5 dist. 73.48 pc (239.69 l.y.)

STF1049 AB: 152; 150x: Gorgeous faint unequal pair, close split at 125x, better seen 150x.  -51% PRO, it is not binary.
07h 13m 42.33s -08° 55' 31.0" P.A. 41.00 sep 3.6 mag 8.36,9.47 Sp B9.5V dist. 338.98 pc (1105.75 l.y.)

STF1052 AB: 152; 125x: Near equal wide pair, in a rich field. 40% PRO, 22,346 AU WS, 4.3+3.8 Msol, there is a chance it's binary and an orbit should be tried.
07h 14m 33.44s -10° 17' 33.5" P.A. 22.00 sep 19.9 mag 8.76,9.19 Sp B5III

STF1056 AB: 152; 125x: Pretty pair, unequal light-orange stars, 1 Dm. 79% PRO, 1,095 AU WS, 2.8+2.0 Msol, it might be binary and an orbit should be tried.
07h 15m 34.34s -01° 51' 36.8" P.A. 298.00 sep 3.9 mag 8.04,8.88 Sp G0 dist. 246.91 pc (805.42 l.y.)

STF1060 AB: 152; 125x: 1 Dm, well split.  -20% PRO, it is not binary.
07h 16m 06.71s -09° 16' 10.9" P.A. 24.00 sep 6.9 mag 8.60,9.59 Sp B7V dist. 284.9 pc (929.34 l.y.)

STF1072 AB: 152; 125x: Very wide, slightly unequal.  -83% PRO, it is not binary.
07h 19m 36.68s -04° 26' 46.7" P.A. 110.00 sep 21.8 mag 9.37,10.81 Sp A2

STF1077 AB: 152; 125x: Faint, slightly unequal white stars.  -10% PRO, it is not binary.
07h 20m 59.96s -00° 40' 13.1" P.A. 319.00 sep 5.5 mag 9.89,9.78 Sp A3

STF1084 AB: 152; 125x: Wide, >1 Dm.  -93% PRO, it is not binary.
07h 24m 01.28s -03° 58' 44.0" P.A. 284.00 sep 14.8 mag 7.20,10.00 Sp K0 dist. 3225.81 pc (10522.59 l.y.)

STF1109 AB: 152; 150x: Closely separated faint pair, equal white stars. 38% PRO, 3,023 AU WS, 3.6+3.6 Msol, it is probably binary and needs an orbit.
07h 31m 54.40s -00° 31' 30.9" P.A. 17.00 sep 3.1 mag 9.26,9.26 Sp A0

STF1111 AB: 152; 125x: Faint, wide.  -1% PRO, and with 10,571 AU WS and RVD 1.1 > EV 1.0, this is not likely binary.
07h 31m 57.66s -08° 41' 14.2" P.A. 221.00 sep 19.9 mag 8.87,9.19 Sp K0II-III

STF1112 AB: 152; 125x: Very wide, 1 Dm.  87% PRO, 682 AU WS, 1.4+0.5 Msol, but the RVD 3.6 > EV 2.2, it is not binary.
07h 32m 05.82s -08° 52' 51.3" P.A. 113.00 sep 23.9 mag 6.03,8.73 Sp F5V dist. 27.92 pc (91.08 l.y.)

STF1128 AB: 152; 125x: 1 Dm, wide.  70% PRO, 1,399 AU WS, 1.5+0.9 Msol, but RVD 2.0 > EV 1.8, it is probably not binary but an orbit should be tried, marginally possible.
07h 39m 48.82s -06° 14' 39.4" P.A. 168.00 sep 15.7 mag 7.89,10.01 Sp G4V dist. 101.21 pc (330.15 l.y.)

STF1132 AB: 152; 125x: Slightly unequal, wide, light orange stars.  -30% PRO, it is not binary.
07h 42m 12.50s -03° 31' 10.4" P.A. 234.00 sep 20.1 mag 8.13,8.49 Sp K5 dist. 288.18 pc (940.04 l.y.)

STF1133 AB: 152; 150x: Quite faint pair, closely separated, 1 Dm.  68% PRO, 958 AU WS, 1.9+1.5 Msol, and the RVD 0.8 < EV 2.5, it is very likely binary and needs an orbit tried.
07h 42m 34.02s -04° 01' 35.4" P.A. 107.00 sep 4.3 mag 8.88,9.96 Sp A5 dist. 152.21 pc (496.51 l.y.)

STF1152 AB: 152; 125x: B is quite fainter, 2 Dm, well split.  5% PRO, 1,693 AU WS, 2.5+1.6 Msol, but RVD 2.4 < EV 2.1, it is not binary.
07h 50m 59.24s -03° 07' 15.6" P.A. 313.00 sep 6.0 mag 8.41,10.29 Sp G5 dist. 316.46 pc (1032.29 l.y.)

STF1154 AB: 152; 150x: 1 Dm, close split. -16% PRO, it is not binary.
07h 52m 08.46s -03° 03' 14.9" P.A. 353.00 sep 2.8 mag 7.13,9.26 Sp A5 dist. 111.98 pc (365.28 l.y.)

STF1353 AB: 152; 150x: Faint near equal white stars, close split.  86% PRO, 339 AU WS, 1.1+1.1 Msol, it is likely binary and needs a binary.
09h 27m 39.28s +15° 44' 32.0" P.A. 125.00 sep 3.3 mag 9.91,9.98 Sp G5 dist. 96.06 pc (313.35 l.y.)

J388 AB: 152; 125x: = STF1354.  Very faint B seen with foveal coaxing, around 10" separation.  33% PRO, 2,321 AU WS, 3.2+1.6 Msol, but RVD 3.3 > EV 1.9, it is not binary.
09h 27m 32.84s +10° 53' 53.9" P.A. 351.00 sep 4.9 mag 8.62,11.80 Sp K0

STF1356 AB: 152; 200x: Hairline split in moments of good seeing, 1 Dm light orange stars.  No Gaia data for the companion.  SOC grade 2 orbit, 117.9-year period, it is near apistron now and will remain well split through 2060.
09h 28m 27.41s +09° 03' 24.4" P.A. 116.00 sep 0.9 mag 5.69,7.28 Sp F9IV dist. 33.17 pc (108.2 l.y.)

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