Saturday, May 21, 2022

20 may 2022 bootes struves

A clear night with hazy transparancy and average seeing, 6/10, but good enough for the 6-inch.  I got the Nexus DSC dialed in and it was quite accurate, everything landing in the field, especially as I continued sychronizing the objects.  The Nexus conviently has many pre-loaded catalogs, including the Struves, so I simply went Struving in Bootes, which was well placed.  Most were typical Struves, though many were faint pairs, and a couple were too closely separated for the 6-inch.  Observed from 9:30 (late darkeness now) to a little past 11pm.

STF 1772 AB: 152; 150x: Whitely and lovely 3 Dm B which appears as a fine point closely separated.  WDS asserts it's physical, but there is no parallax range overlap, -13%, so it is not binary.
13h 40m 40.50s +19° 57' 20.4" P.A. 133.00 sep 4.4 mag 5.76,9.60 Sp A1V dist. 100.6 pc (328.16 l.y.)

STF 1773 AB: 152; 150x: Faint B, super wide, 1 Dm.  WDS says proper motion indicates not physical.  There is no overlap of the parallax ranges, -98%, definitely not binary.
13h 41m 38.19s +07° 36' 21.3" P.A. 209.00 sep 30.6 mag 9.95,10.00 Sp F7V

STF 1779 AB: 152; 200x: Difficult faint pair (in poor transparency), just split with seeing when the hazy stars resolve to harder points, around 4" and 1 Dm.  WDS uncertain.  I find there is 88% parallax range overlap, 1,135 AU weighted separation, 2.0+1.5 Msol, so it is probable this is binary. 
13h 44m 33.98s +23° 40' 06.0" P.A. 145.00 sep 3.8 mag 9.26,10.37 Sp A5 dist. 775.19 pc (2528.67 l.y.)

STF 1782 AB: 152; 150x:  1 Dm, wide.  WDS asserts it's physical.  I find no parallax range overlap, -32%, so it is not binary.
13h 45m 06.87s +18° 22' 04.3" P.A. 185.00 sep 30.4 mag 7.98,9.81 Sp F5

STF 1785 AB: 152; 150x:  Very pretty light orange stars, 1 Dm.  WDS says physical with a 156-year period.  I find 47% parallax range overlap, only 48 AU weighted separation, 0.7+0.6 Msol, so it certainly is binary.  It will close another 1.5" in the next 20 years but remain resolvable in the 6-inch.  
13h 49m 04.00s +26° 58' 47.7" P.A. 191.40 sep 2.7 mag 7.36,8.15 Sp K4V+K6V dist. 13.41 pc (43.74 l.y.)
STF 1791 AB: 152; 150x: Faint near equal pair, around 4" separation.  WDS notes parallax indicates components are non-physical.  Unfortunately Gaia lacks parallax data.
13h 56m 49.22s +14° 25' 58.6" P.A. 159.00 sep 21.0 mag 9.39,10.73 Sp F7V+G1IV

STF 1792 AB: 152; 150x: Very difficult, with seeing, faint stars nearly 1 Dm, just seaprated.  WDS uncertain.  There is no parallax range overlap, -50%, so it is not binary.
13h 57m 03.72s +12° 27' 03.5" P.A. 291.00 sep 2.3 mag 9.98,10.89 Sp F8 dist. 1470.59 pc (4797.06 l.y.)

STF 1793 AB: 152; 150x: Pretty blue-yellow A, 1 Dm yellow B, wide.  WDS uncertain.  There is 1% parallax range overlap, 859 AU weighted separation, 2.3+1.8, so it might be binary.
13h 59m 05.25s +25° 48' 57.6" P.A. 243.00 sep 4.8 mag 7.46,8.39 Sp A5V dist. 153.61 pc (501.08 l.y.)

STF 1794 AB: 152; 150x: Very nice, closely split near equal white stars.  WDS uncertain, but I find 73% parallax range overlap, only 252 AU weighted separation, 1.3+1.2 Msol, and the radial velocity delta 2.1 is less than the escape velocity 4.2, so this is binary.
13h 59m 48.26s +19° 52' 57.8" P.A. 125.00 sep 1.8 mag 9.48,9.65 Sp F8 dist. 151.29 pc (493.51 l.y.)

STF 1779 AB: 152; 150x: Well separated 1 Dm light orange stars.  WDS uncertain, but I find 88% parallax range overlap, 1,135 AU weighted separation, 2.0+1.5 Msol, so it is likely binary.
13h 44m 33.98s +23° 40' 06.0" P.A. 145.00 sep 3.8 mag 9.26,10.37 Sp A5 dist. 775.19 pc (2528.67 l.y.)

STF 1804 AB: 152; 150x: Very pretty light blue A and light orange B, 2 Dm, fairly close split.  WDS asserts phycial, but there is no overlap of the parallax ranges -92%, so it is not binary.
14h 08m 15.53s +21° 11' 34.9" P.A. 13.00 sep 4.7 mag 8.17,9.28 Sp F8 dist. 72.46 pc (236.36 l.y.)

STF 1806 AB: 152; 150x: Faint stars, 1 Dm, fairly wide, white.  WDS says parallax indicates physical, but there is no overlap of the parallax ranges, -10%, and the radial velocity delta exceeds the escape velocity.  It is not binary.
14h 08m 44.98s +48° 30' 24.5" P.A. 173.00 sep 13.1 mag 10.08,11.03 Sp F8

STF 1808 AB: 152; 150x: Very pretty close pair, 2 Dm.  WDS asserts it is physical, but there is no overlap of their parallax ranges, -5%, it is not binary.
14h 10m 07.76s +26° 35' 58.1" P.A. 83.00 sep 2.7 mag 8.83,9.63 Sp G5 dist. 70.87 pc (231.18 l.y.)

STF 1809 AB: 152; 150x: The B star is very faint, seen with averted vision only, very close to A.  WDS is uncertain, but there is 58% overlap of the parallax ranges, 1,199 AU weighted separation, 1.9+1.1 Msol, and the radial velocity delta 0.0 is less than the escape velocity 2.1, so it is very likely binary.
14h 08m 54.59s +46° 08' 03.4" P.A. 196.00 sep 4.3 mag 9.42,11.98 Sp G0 dist. 353.36 pc (1152.66 l.y.)

STF 1810 AB: 152; 150x: Fine white stars, close around 3".  WDS asserts physical, but there is no overlap of the parallax ranges, -15%, it is not binary.
14h 11m 33.66s +28° 02' 12.2" P.A. 183.00 sep 2.4 mag 8.98,9.60 Sp G0 dist. 116.28 pc (379.31 l.y.)

STF 1812 AB-C: 152; 150x: White stars, 2 Dm, fairly wide.  WDS says proper motion indicates physical, and there is 48% overlap of parallax ranges, 2.1+1.4 Msol, so it is likely binary.  AB is STT 277, 0.2" 8.73/8.61, not seen.
14h 12m 26.68s +28° 43' 02.3" P.A. 108.00 sep 14.1 mag 7.88,9.45 Sp F2V dist. 1000 pc (3262 l.y.)

STF 1814 AB: 152; 150x: Pretty, near equal, wide.  WDS says parallax indicates physical, and there is 83% parallax range overlap, 1,304 AU weighted separation, 1.3+1.1 Msol, and the radial velocity delta 0.3 is less than the escape velocity 1.8, so it is very likely binary.
14h 11m 00.99s +50° 15' 08.3" P.A. 256.00 sep 11.2 mag 9.25,9.83 Sp G5+G5

STF 1815 AB: 152; 150x: DQ Boo.  9th and 10th magnitude stars, well separated, in a rich field.  WDS asserts it is physical, but there is no -89% parallax range overlap, it is not binary.
14h 12m 36.22s +45° 11' 52.5" P.A. 151.00 sep 9.0 mag 9.58,10.92 Sp K0 dist. 170.07 pc (554.77 l.y.)

STF 1816 AB: 152; 400x: Notched elongation in a ENE-WSW direction, near equal.  WDS orbit with 1340-year period, and unfortunately there is no parallax data for the secondary.
14h 13m 54.63s +29° 06' 19.5" P.A. 101.80 sep 0.3 mag 7.43,7.75 Sp F0+A2 dist. 113.38 pc (369.85 l.y.)
STF 1818 AB: 152; 150x: Faint stars, 2 Dm, well separated.  WDS says proper motion indicates physical, and there is 56% overlap of the parallax ranges, 457 AU weighted separation, 1.1+0.8 Msol, and the radial velocity delta 0.6 is less than the escape velocity 2.8, so it is very likely binary.
14h 14m 16.33s +33° 55' 41.8" P.A. 330.00 sep 5.4 mag 9.01,10.24 Sp G2III dist. 72.78 pc (237.41 l.y.)

STF 1821 AB: 152; 150x: Blazing bright yellow A and 2 Dm yellow B, well separated.  WDS orbit with a 20-year period -- must be incorrect as they are showing 0.04" separation for the orbit.  There is no parallax data for the secondary.
14h 13m 29.00s +51° 47' 23.8" P.A. 235.00 sep 13.8 mag 4.53,6.62 Sp A7V+F1V dist. 50.1 pc (163.43 l.y.)

STF 1823 AB-C: 152; 150x: Faint light orange stars, 1 Dm, closely separated.  AB is A 1101, 9.69/10.32 0.3".  WDS says proper motion indicates physical.  No Gaia parallax data for the primary.
14h 15m 50.57s +10° 17' 59.3" P.A. 148.00 sep 3.9 mag 9.19,9.77 Sp K0 dist. 59.88 pc (195.33 l.y.)

STF 1825 AB: 152; 150x: Bright A, 2 Dm B is well separated.  WDS orbital solution 1085-year period, proper motion indicates physical.  There is 31% parallax range overlap, 147 AU weighted separation, 1.3+0.8 Msol, so it likely is binary.
14h 16m 32.84s +20° 07' 18.7" P.A. 152.80 sep 4.4 mag 6.47,8.42 Sp F6V dist. 32.63 pc (106.44 l.y.)

STF 1826 AB: 152; 150x: White stars, nearly 2 Dm, well separated.  WDS says not physical.  But I find 62% overlap of the parallax ranges, only 802 AU weighted separation, 1.7+1.4 Msol, so it is likely binary.
14h 15m 12.13s +46° 58' 26.6" P.A. 310.00 sep 4.5 mag 8.94,9.69 Sp F8 dist. 176.99 pc (577.34 l.y.)

STF 1828 AB: 152; 200x: Difficult, equal faint stars, with seeing when the faint haze sharpens to points.  WDS uncertain, and I find no -4% overlap of the parallax ranges, so they very likely are not binary.
14h 16m 58.35s +24° 11' 33.4" P.A. 159.00 sep 2.1 mag 10.40,10.75 Sp F2

STF 1829 AB: 152; 150x: Pretty, sharp white equal stars, closely separated.  WDS asserts physical, and there is 27% parallax range overlap, 825 AU weighted separation, 1.9+1.6 Msol, and the radial velocity delta 2.1 is less than the escape velocity 2.7, so it is very likely binary.
14h 15m 27.95s +50° 26' 24.6" P.A. 151.00 sep 5.6 mag 8.10,8.63 Sp F5 dist. 160.51 pc (523.58 l.y.)

STF 1834 AB: 152; 200x: Excellent equal white stars, nice and sharp.  Split with 150x but best view at 200x.  WDS orbit 413-year period.  But there is no parallax range overlap, -12%, so this likely is not binary.
14h 20m 17.60s +48° 30' 25.1" P.A. 103.50 sep 1.6 mag 8.09,8.29 Sp F9V dist. 75.36 pc (245.82 l.y.)

STF 1835 A-BC: 152; 150x: Very pretty light yellow stars, bright A and 2 Dm deeper yellow B, well separated.  BC is BU 1111, 7.4/7.7 0.3" not seen.  WDS says proper motion indicates physical, unfortunately Gaia has no data for the secondary.
14h 23m 22.74s +08° 26' 47.9" P.A. 197.00 sep 6.4 mag 5.03,6.78 Sp A0V+F2V dist. 65.92 pc (215.03 l.y.)

STF 1838 AB: 152; 150x: Equal white stars, well split.  WDS says proper motion indicates physical.  There is 21% overlap of the parallax ranges, 354 AU weighted separation, 1.1+1.0 Msol, so it is likely binary.
14h 24m 05.76s +11° 14' 49.1" P.A. 335.00 sep 9.4 mag 7.47,7.73 Sp F8V+G1V dist. 37.08 pc (120.95 l.y.)

STF 1839 AB: 152; 150x: Equal magnitude white stars, wide separation.  WDS says parallax indicates physical, and there is 42% parallax range overlap, 1,989 AU weighted separation, 1.5+1.5 Msol, and the radial velocity delta 0.5 is less than the escape velocity 1.7, so it likely is binary.
14h 21m 27.38s +53° 53' 50.9" P.A. 83.00 sep 14.5 mag 8.84,8.92 Sp G0 dist. 178.89 pc (583.54 l.y.)

STF 1843 AB: 152; 150x: White stars, wide, 1 Dm.  WDS says proper motion indicates physical, and there is 52% parallax range overlap, 1,909 AU weighted separation, 1.7+1.1 Msol, however the radial velocity delta 2.0 exceeds the escape velocity 1.6, so it might not be binary.
14h 24m 38.91s +47° 49' 50.0" P.A. 186.00 sep 19.8 mag 7.68,9.23 Sp F4V dist. 92.08 pc (300.36 l.y.)

STF 1848 AB: 152; 150x: B is very faint, seen with averted vision only, very closely separated.  WDS asserts it is physical, and there is 36% overlap in their parallax ranges, 684 AU weighted separation, 2.0+1.0 Msol, so it may be binary.
14h 27m 45.30s +32° 57' 02.9" P.A. 356.00 sep 3.1 mag 8.67,11.69 Sp A3 dist. 196.46 pc (640.85 l.y.)

STF 1850 AB: 152; 150x: Bright white stars, wide, 1 Dm.  WDS asserts it is physical, and there is 18% overlap of the parallax ranges, a pretty wide 6,819 AU weighted separation, 3.1+2.7 Msol, so it might be binary.
14h 28m 33.29s +28° 17' 25.9" P.A. 263.00 sep 25.2 mag 7.11,7.56 Sp A1V+A1V dist. 349.65 pc (1140.56 l.y.)

STF 1854 AB: 152; 150x: Bright yellow-white A, very faint B appears and can be held after foveal coaxing.  WDS asserts it is physical, but there is no -32% overlap of the parallax ranges, it is not binary.
14h 29m 49.66s +31° 47' 28.2" P.A. 256.00 sep 26.1 mag 6.05,10.62 Sp A0Vs dist. 110.13 pc (359.24 l.y.)

STF 1855 AB: 152; 150x: Wide light orange stars, slight Dm.  WDS says proper motion indicates physical, however there is no -37% parallax range overlap, so it is not binary.
14h 32m 22.73s +31° 38' 12.5" P.A. 247.00 sep 15.7 mag 9.24,9.94 Sp G0 dist. 112.87 pc (368.18 l.y.)

STF 1857 AB: 152; 150x: Very faint, B is on the edge of detectability and with averted vision only, wide separation.  WDS uncertain, but there is no overlap -91% of the parallax ranges, so it is not binary.
14h 34m 40.35s +10° 10' 17.6" P.A. 354.00 sep 16.8 mag 10.02,12.49 Sp K0

STF 1858 AB: 152; 200x: 2 Dm, fairly close split at 150x, better view at 200x.  WDS orbital solution 1329-year period.  But there is no overlap -27% of the parallax ranges, it is not binary.
14h 33m 36.45s +35° 35' 08.0" P.A. 37.60 sep 3.0 mag 8.13,8.98 Sp G5 dist. 36.79 pc (120.01 l.y.)

STF 1861 AB: 152; 150x: Easy, faint pair, wide, less than 1 Dm.  WDS says parallax indicates physical, and there is 14% overlap of the parallax ranges, 2,930 AU weighted separation, 1.6+1.4 Msol, however the radial velocity delta 46.4 far exceeds the escape velocity 1.3, these are not binary.
14h 36m 42.39s +12° 10' 10.5" P.A. 174.00 sep 13.9 mag 9.73,10.28 Sp G0 dist. 268.1 pc (874.54 l.y.)

STF 1862 AB: 152; 150x: Easy 1 Dm wide pair.  WDS says parallax indicates physical, and there is 8% parallax range overlap, 3,461 AU weighted separation, 1.8+1.3 Msol, however the radial velocity delta 1.4 exceeds the escape velocity 1.3, so this probably is not binary.
14h 37m 49.07s +14° 54' 09.6" P.A. 125.00 sep 14.9 mag 9.31,10.51 Sp F5IV dist. 558.66 pc (1822.35 l.y.)

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