13 april 2020

Last night was clear, but a little dewy and transparency was poor -- planes on approach to Oakland cast their beams through the haze. Seeing was poor, 5/10, so I kept the magnification relatively low at 333x, except for a couple of observations, and used my apodizing mask throughout. I did have some moments of very good seeing, which made me hopeful. But by 11:15 it had grown noticeably colder and the seeing went to pot. I presume an inversion had created a turbulent warm/cold air layer above me. So I packed it in. Hopes for some clear skies tonight.

STF 1413 AB: 508; 333x: Very pretty equal pair, white, close ~1.5"
10h 12m 18.72s +16° 20' 54.3" P.A. 270 sep 1.8 mag 9.76,9.77 Sp G0

STF 1417 AB: 508; 333x: Equal yellow-white pair, ~2"
10h 15m 08.60s +19° 07' 27.3" P.A. 78 sep 2.4 mag 9.24,9.31 Sp F2 dist. 235.29 pc (767.52 l.y.)

HU 1254 AB: 508; 333x: Elongated to hairline split. Noticeable magnitude difference.
10h 15m 10.48s +11° 52' 43.5" P.A. 20 sep 0.6 mag 10.05,10.43 Sp G0 dist. 67.93 pc (221.59 l.y.)

STT 215 AB: 508; 333x: Near equal light yellow stars, ~1.5"
10h 16m 16.05s +17° 44' 24.6" P.A. 176.1 sep 1.5 mag 7.25,7.46 Sp A9IV dist. 114.55 pc (373.66 l.y.)

STF 1419 AB: 508; 333x: Light yellow-white A and slightly blue B, wide ~4", ~1 delta mag.
10h 17m 02.94s +10° 06' 51.7" P.A. 225 sep 4.5 mag 8.87,9.86 Sp A0 dist. 431.03 pc (1406.02 l.y.)

STT 523 AB: 508; 333x: 39 Leo. ! Nice bright light yellow-orange A star. B is very small, very faint, ~8" separation, a single little point, barely has its own light.
10h 17m 14.53s +23° 06' 22.3" P.A. 300 sep 7.9 mag 5.80,11.30 Sp F6V+M1.5 dist. 22.81 pc (74.41 l.y.)

A 2369 AB: 508; 533x: ! Needed higher magnification to get it. Orange star with a faint but nice star in first diffraction ring, much fainter, ~1". Nice

10h 17m 59.92s +17° 11' 11.9" P.A. 296 sep 1 mag 8.53,9.66 Sp K2 dist. 4000 pc (13048 l.y.)

COU 170 AB: 508; 333x: Can't see the pair but there seems to be two galaxies in the field. [NGC 3189 & 3187]
10h 18m 41.27s +21° 55' 22.8" P.A. 122 sep 0.7 mag 11.10,11.80

STF 1424 AB: 508; 333x: Algieba. Very bright, A is yellow-orange and B is a blazing white orange, like a fire.
10h 19m 58.35s +19° 50' 29.4" P.A. 126.5 sep 4.73 mag 2.37,3.64 Sp K0III dist. 39.89 pc (130.12 l.y.)

STT 216 AB: 508; 333x: Yellow and very much fainter orange B, ! delta mag, ~4" separated.
10h 22m 43.81s +15° 20' 39.7" P.A. 229.2 sep 2.29 mag 7.38,10.28 Sp G5 dist. 28.77 pc (93.85 l.y.)

A 1990 AB: 508; 333x: Near equal, elongated in a haze but does resolve to two stars with seeing, a bit more than 1" separation
10h 23m 25.93s +26° 29' 38.7" P.A. 290 sep 1.5 mag 9.48,9.60 Sp F8

A 1991 AB: 508; 333x: Near equal, split with seeing, ~1" separation
10h 23m 34.87s +26° 17' 26.1" P.A. 191 sep 1.5 mag 10.13,10.38 Sp G5V

STF 1429 AB: 508; 533x; Elongated to hairline at 333x, split at 533x. Light orange stars, near equal
10h 25m 01.79s +24° 36' 44.1" P.A. 154.4 sep 0.78 mag 9.05,9.34 Sp G0V dist. 67.48 pc (220.12 l.y.)

POU3080 AB; 508; 333x: Light orange-yellow A and ~1.5 delta mag B, white, well separated.
10h 25m 29.14s +23° 21' 38.6" P.A. 102 sep 5.6 mag 9.74,10.90

STT 217 AB: 508; 333x: ! Just split cleanly, ~1 delta mag, yellow-tinged white stars. Nice close pair.
10h 26m 53.01s +17° 13' 09.9" P.A. 148.9 sep 0.8 mag 7.85,8.58 Sp F6V dist. 84.75 pc (276.45 l.y.)

STF 1434 AB: 508; 333x: Near equal white, wide
10h 27m 08.41s +18° 03' 44.6" P.A. 281 sep 6.5 mag 9.49,9.68 Sp G5 dist. 60.83 pc (198.43 l.y.)

STF 1439 AB: 508; 333x: ! Very clean images, light yellow-orange stars, ~1 delta mag, well split, very pretty
10h 30m 06.42s +20° 48' 04.3" P.A. 73 sep 1.4 mag 8.32,8.87 Sp G0V dist. 76.63 pc (249.97 l.y.)

STF 1442 AB: 508; 333x: Near equal white with a hint of yellow, wide. [not physical]
10h 31m 58.95s +22° 02' 22.0" P.A. 157 sep 13.3 mag 8.18,8.54 Sp F0 dist. 137.93 pc (449.93 l.y.)

STF 1447 AB: 508; 333x: Nice pair of yellow stars, ~1.5 delta mag, wide
10h 33m 47.28s +23° 21' 02.4" P.A. 124 sep 4.6 mag 7.52,8.88 Sp A2 dist. 153.61 pc (501.08 l.y.)

STF 1450 AB; 508; 333x: 49 Leo. ! Striking pair, light yellow A and a richer orange-yellow B, ~2.5 delta mag, well split
10h 35m 02.16s +08° 39' 01.6" P.A. 156 sep 2.2 mag 5.80,7.90 Sp A2V dist. 131.41 pc (428.66 l.y.)

J 79 AB: 508; 333x: ! Very nice, ~2 delta mag, close ~2" separation, blue-white stars.
10h 38m 54.93s +07° 21' 26.0" P.A. 132 sep 1.5 mag 9.02,10.12 Sp F8 dist. 176.06 pc (574.31 l.y.)

STT 227 AB: 508; 333x: ! Pure white stars, ~1" separation, ~2 delta mag, very fine and striking
10h 41m 41.58s +10° 44' 22.3" P.A. 2 sep 0.9 mag 8.27,8.77 Sp A2

A 2483 AB: 508; 333x: ! Wow, very fine ~2 delta mag, ~2" separation. Very much fainter B about as faint as can be before needing averted vision.
10h 42m 08.09s +16° 17' 03.6" P.A. 227 sep 2.2 mag 9.36,11.38 Sp G5 dist. 168.92 pc (551.02 l.y.)

STF 1468 AB: 508; 333x: Near equal white stars, wide
10h 44m 39.96s +20° 42' 18.5" P.A. 334 sep 4.4 mag 9.68,9.65 Sp G0 dist. 104.49 pc (340.85 l.y.)

STT 228 AB: 508; 533x: With fine focus, split with seeing, ~1 delta mag, ~1" separation. Pretty tough needed 533x to split, elongated at 333x.
10h 47m 16.93s +22° 34' 32.0" P.A. 170 sep 1.7 mag 8.17,8.93 Sp F0 dist. 158.23 pc (516.15 l.y.)

A 2370 AB: 508; 333x: (Red giant branch star) Very nice, white A and B blue for faintness, very clear, widely split, ~ 2 delta mag.

10h 49m 34.11s +16° 30' 24.9" P.A. 335 sep 2.7 mag 9.95,10.87 Sp G5 dist. 471.7 pc (1538.69 l.y.)

A 2371 AB: 508; 333x: Nice ~2 delta mag pair, ~2.5" separation. [not physical]
10h 49m 45.93s +18° 05' 09.6" P.A. 320 sep 2.7 mag 9.85,10.96 Sp F8

HO 376 AB: 508; 333x: White A, B just seen direct, wide ~4", decent pair
10h 52m 40.84s +23° 12' 03.6" P.A. 218 sep 3 mag 9.90,11.10 Sp F8

STF 1487 AB: 508; 333x: 54 Leo. Brilliant pair, light white-yellow stars, ~2 delta mag, wide
10h 55m 36.80s +24° 44' 59.0" P.A. 112 sep 6.8 mag 4.48,6.30 Sp A1V+A2Vn dist. 87.95 pc (286.89 l.y.)

STF 1517 AB: 508; 533x: ~ Touching disks with 333x, clean slit with 533x, ~0.5" separation, Yellow-orange stars, near equal
11h 13m 40.99s +20° 07' 43.3" P.A. 315.3 sep 0.73 mag 7.54,8.02 Sp G5V dist. 54.5 pc (177.78 l.y.)

BU 1283 AB: 508; 533x: Elongated at 533x, but the sky is too hazy, and this pair is a bright star's glare. BU 1283 looks like a piece of debris from an exploding bright star. [Theta Leo, 3.33v, to the SW]
11h 14m 24.68s +15° 30' 51.8" P.A. 174 sep 0.3 mag 9.80,10.40 Sp F0