12 april 2020

I noticed a two hour window in the forecast for last night where it would clear and seeing would be half decent.  So I opened up the shed in the late afternoon, coming back out after 9pm to find it was good enough to roll back the shed.  Seeing wasn't great so I masked to 7-inches, and observed some nice stars in Ursa Major.  Unfortunately that meant the scope was pointed in the landing path of jets on the way to Oakland airport, so seeing was disturbed for minutes at a time from their exhaust.  Almost exactly after 2 hours the window closed, seeing went to pot and haze started to build, so I closed up.  Still, it's always worth it to go out.

STF1491 AB: 178; 205x: A is a light yellow, B not seen with direct at first, but it flashes brightly with averted vision, and I then can hold it direct.  Very well split, three delta.  Physical.
10h 58m 50.42s +61° 42' 56.4" P.A. 33.00 sep 14.1 mag 8.39,11.33 Sp K0 dist. 1052.63 pc (3433.68 l.y.)

A 1590 AB: 178; 205x: Light orange A and blue-green B, >1" separation, half delta mag.  Physical with 163-year period, it's not at apastron and won't make significant change for several decades.
11h 03m 27.91s +54° 31' 33.0" P.A. 327.30 sep 1.5 mag 8.95,9.64 Sp K2V dist. 43.37 pc (141.47 l.y.)

HO 49 AB: 178; 205x: White A and faint B which appears consistently with averted vision, but I can't hold it direct even with foveal coaxing.  Well separated, 2 delta mag.  Physical.
11h 04m 46.60s +56° 59' 31.8" P.A. 356.00 sep 7.5 mag 8.38,11.56 Sp F8 dist. 104.28 pc (340.16 l.y.)

STF1505 AB: 178; 205x: Very light orange A, and faint B can just hold direct vision, brightens with averted vision, well split, 2 delta mag.  Physical.
11h 05m 41.23s +62° 37' 01.5" P.A. 312.00 sep 8.2 mag 8.95,10.55 Sp G5 dist. 185.53 pc (605.2 l.y.)

STF1512 AB: 178; 205x: Dual white stars, near equal, wide

11h 09m 13.09s +62° 29' 51.0" P.A. 51.00 sep 9.9 mag 9.29,9.52 Sp A2 dist. 448.43 pc (1462.78 l.y.)

MLB 408 AB: 178; 205x: Faint B seen with averted vision only, wide, 1 delta mag.
11h 10m 45.23s +64° 42' 44.5" P.A. 348.00 sep 8.0 mag 9.19,10.90 Sp F5

A 1355 AB: 178; 205x: White A, B is a haze which appears with averted vision on one side of A, a mass that appears rather than a point.  On the edge of detectability because of the poor transparency this night.

11h 28m 11.48s +55° 40' 05.4" P.A. 359.00 sep 1.3 mag 7.72,11.54 Sp A0 dist. 112.11 pc (365.7 l.y.)

STF1544 AB: 178; 205x: Bright and easy wide pair, 1 delta mag, A is light yellow and B slightly blue-white.  Physical.
11h 31m 18.57s +59° 42' 03.3" P.A. 91.00 sep 12.2 mag 7.33,8.02 Sp A3+Am dist. 588.24 pc (1918.84 l.y.)

PTT 22 AB: 178; 205x: Faint pair, brightens and sharpens with averted vision, near equal, wide.  E. Pettit.  Physical.
11h 31m 56.64s +62° 36' 41.9" P.A. 174.00 sep 5.1 mag 11.40,11.65 Sp F9+G0

STF1546 AB: 178; 205x: Light yellow A and wide 3 delta magnitude B.  Physical.
11h 32m 20.34s +56° 05' 43.3" P.A. 349.00 sep 11.4 mag 7.54,10.30 Sp F8 dist. 56.69 pc (184.92 l.y.)

KR 38 AB: 178; 205x: Very fine, near equal light orange pair, well split.  Not physical.
11h 32m 51.38s +60° 04' 01.8" P.A. 53.00 sep 2.8 mag 9.93,10.22

KR 39 AB: 178; 205x: 1 delta mag and wide, slightly blue pair.  Physical.
11h 33m 18.81s +57° 48' 21.6" P.A. 152.00 sep 10.4 mag 9.80,10.85 Sp G2V

STF1553 AB: 178; 205x: White, pretty wide, 1 delta mag, typical Struve.  Physical with a 1996-year period, slowly approaching apastron.
11h 36m 35.69s +56° 08' 07.3" P.A. 165.70 sep 6.2 mag 7.73,8.17 Sp G5+K7V dist. 46.99 pc (153.28 l.y.)

STF1559 AB: 178; 205x: Very striking colors, A is a strong blue-white, and 2 delta mag B is a reddish orange color, about 3" separation, a very great pair!
11h 38m 49.11s +64° 20' 49.4" P.A. 326.00 sep 2.0 mag 6.81,8.01 Sp A5IV dist. 210.97 pc (688.18 l.y.)

STF1563 AB: 178; 205x: Dull yellow A and blue B, very wide, 2 delta mag.  Physical.
11h 39m 23.55s +52° 11' 15.4" P.A. 157.00 sep 13.7 mag 8.58,10.64 Sp G0 dist. 83.47 pc (272.28 l.y.)

STF1567 AB: 178; 205x: Very fine faint pair, about 4" separation and 2 delta mag.  Not physical.
11h 42m 58.94s +64° 21' 19.4" P.A. 84.00 sep 3.6 mag 9.35,10.50 Sp F5

STT 243 AB: 178; 205x: Wow very good, excellent with seeing, 1 delta mag and 1" separation, more than hairline split
11h 59m 48.70s +53° 23' 52.1" P.A. 8.00 sep 1.2 mag 9.08,9.67 Sp F8 dist. 342.47 pc (1117.14 l.y.)

STF1600 AB: 178; 205x: Easy white-yellow Struve, half delta mag, wide.
12h 05m 34.42s +51° 55' 52.2" P.A. 92.00 sep 7.8 mag 7.63,8.28 Sp G8III dist. 369 pc (1203.68 l.y.)

STT 244 AB: 178; 205x: White A and 3 delta mag B, well split.  Physical.
12h 05m 35.22s +52° 52' 31.7" P.A. 324.00 sep 3.1 mag 8.07,10.56 Sp F5 dist. 122.25 pc (398.78 l.y.)

HU 1136 AB: 178; 205x: With seeing, when light yellow A settles to disk, a very faint small haze develops on the edge of A's diffraction, and with best seeing resolves to a very faint small blue round glow, 1" separation.  Physical.
12h 05m 39.70s +62° 55' 59.3" P.A. 212.00 sep 2.1 mag 6.27,10.24 Sp K1III-IV dist. 117.92 pc (384.66 l.y.)

STF1608 AB: 178; 205x: Yellow-white stars, near equal, wide.  Physical with a 2236-year period, it is nearing apastron now.  It's also variable star MZ UMa, which as best as I can find has a 0.02 magnitude change over a 7.96 day period. 
12h 11m 27.76s +53° 25' 17.5" P.A. 220.50 sep 13.6 mag 8.11,8.27 Sp K0 dist. 30.15 pc (98.35 l.y.)

STF1630 AB: 178; 205x: Faint pair, 1 delta, well split about 2" 
12h 18m 53.81s +56° 22' 06.0" P.A. 171.00 sep 2.5 mag 9.50,10.26 Sp G0 dist. 105.71 pc (344.83 l.y.)

STF1695 AB: 178; 205x: Light yellow-white A, and a deeper yellow B, 2 delta mag, well split, attractive pair.  Physical.
12h 56m 17.64s +54° 05' 58.1" P.A. 281.00 sep 3.8 mag 6.04,7.75 Sp A5m dist. 86.66 pc (282.68 l.y.)

STF1403 AB: 178; 205x: White stars, with seeing in poor conditions, well split, 2 delta mag
10h 02m 51.33s +07° 42' 20.2" P.A. 334.00 sep 3.1 mag 9.55,9.94 Sp F8

STF1438 AB: 178; 205x: Faint pair, B is wide and seen with averted vision only.  Not physical.
10h 29m 13.82s +13° 08' 59.5" P.A. 276.00 sep 2.5 mag 9.58,11.11 Sp F8