Monday, July 1, 2019

a few doubles in Virgo

Was out the night of 6/30 with the 20", but seeing was not good so I masked down to 8" which showed really excellent airy disks.  It was a short night, ending at 11pm, as I needed to rest for a busy day today.  It was an interesting session with a number of close pairs.

STF1757;AB;;203;205x: Close, ~2", a dull orange, ~1.5 delta mag.  It was a brighter orange in the 20" but as soon as I saw the seeing I masked down.
13h 34m 16.38s -00° 18' 49.8" P.A. 143 sep 1.68 mag 7.82,8.75 Sp K4III dist. 26.56 pc (86.64 l.y.)

STF1740;AB;;203;333x: hair split equal white pair. Suspected elongation at 205x but needed 333x to split. 667x too much power given the conditions.
13h 23m 39.16s +02° 43' 24.0" P.A. 75 sep 26.1 mag 7.13,7.39 Sp G5V+G5V dist. 15.45 pc (50.4 l.y.)
STF1734;AB;;203;333x: Blue-white A, light orange B, half delta mag, close ~1.5". Nice!
13h 20m 41.57s +02° 56' 31.9" P.A. 173 sep 1.1 mag 6.77,7.29 Sp A3V dist. 135.5 pc (442 l.y.)

STF1740;AB;;203;333x: Easy wide white A and hint or orange B.
13h 23m 39.16s +02° 43' 24.0" P.A. 75 sep 26.1 mag 7.13,7.39 Sp G5V+G5V dist. 15.45 pc (50.4 l.y.)

STF1764;AB;;203;333x: Orange and 2x fainter blue, wide. Another equal wide pair to the south.
13h 37m 44.01s +02° 22' 56.5" P.A. 32 sep 15.9 mag 6.79,8.56 Sp K2III dist. 625 pc (2038.75 l.y.)

STF1777;AB;;203;333x: Light orange and blue-green B, large magnitude difference, ~3". Pretty.
13h 43m 03.71s +03° 32' 16.4" P.A. 228 sep 2.6 mag 5.55,8.31 Sp K1III dist. 73.1 pc (238.45 l.y.)

STF1781;AB;;203;333x: White A and slightly yellow B, ~2", half delta mag
13h 46m 06.75s +05° 06' 56.1" P.A. 197.8 sep 1.02 mag 7.89,8.10 Sp F8V+F0 dist. 46.38 pc (151.29 l.y.)
LDS3101;AB;;203;333x: Light yellow A and very much fainter B, 4-5 delta mag., B is just detectable at this aperture Well separated.
13h 46m 57.12s +06° 21' 01.4" P.A. 105 sep 488.5 mag 6.40,10.18 Sp G0-1IV-V dist. 31.67 pc (103.31 l.y.)
BU115;AC;;203;333x: Slightly orange and very wide separated, much fainter bluish star just visible. Did not notice AB 1.6" 10.4 mag.
13h 45m 20.87s +09° 03' 28.6" P.A. 169 sep 107.3 mag 7.53,13.18 Sp G5 dist. 54.67 pc (178.33 l.y.)

Kui66;AB;;203;333x: Light orange and two possible pairs, both very faint on the edge of detection. One closer but still visible, very wide. The other one third more wide [Not seen -- this is 0.8" and 3 delta mag.]
14h 14m 50.85s +10° 06' 02.2" P.A. 111 sep 0.8 mag 5.44,8.43 Sp K1III dist. 81.23 pc (264.97 l.y.)

STT281;AB;;203;333x: Very fine, but well split, huge delta mag, surprise!
14h 20m 20.85s +08° 34' 56.3" P.A. 166 sep 1.5 mag 7.71,9.69 Sp G5

STF1835;A-BC;;203;333x: Yellow A and slightly yellow B, wide. Did not notice BU1111BC, 0.3" 7.4/7.7
14h 23m 22.74s +08° 26' 47.9" P.A. 195 sep 6.1 mag 5.03,6.78 Sp A0V+F2V dist. 65.92 pc (215.03 l.y.)

STF1870;AB;;203;333x: Yellow A and very much fainter B, wide ~5"? 4 delta mag. B flashes to view with seeing
14h 42m 55.10s +08° 04' 34.3" P.A. 229 sep 4.8 mag 7.46,9.98 Sp F2 dist. 198.02 pc (645.94 l.y.)

STF1873;AB;;203;333x: Light orange and light blue, wide.
14h 44m 48.13s +07° 42' 04.0" P.A. 94 sep 6.9 mag 7.96,8.35 Sp G5III dist. 232.56 pc (758.61 l.y.)

A1109;AB;*;203;333x: Both stars light yellow, big magnitude difference, ~3-4 delta mag, about 2". Not difficult
14h 42m 47.60s +06° 35' 26.4" P.A. 89.4 sep 1.75 mag 7.44,9.44 Sp F8V

BU1443;AB;;203;333x: Light yellow-orange A and much fainter blue B, wide separation.
14h 30m 45.39s +04° 46' 20.2" P.A. 195 sep 55.7 mag 6.17,10.62 Sp gK4 dist. 212.77 pc (694.06 l.y.)

I had a look at Jupiter but it is too low to be of any satisfaction, sadly.

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