20 january 2022

Had a night out with the 20-inch but the seeing and transparency were not great, so spent the time masked down to 7-inches. I tried out the 18mm zoom eyepiece which generally works well but seems to have some scattered light and ghost images on bright stars. Will go back to my usual eyepiece set.

STF 752 AB: 178; 148x: Bright white A and faint wide B, with other wider stars nearby.
05h 35m 25.98s -05° 54' 35.6" P.A. 146.00 sep 12.5 mag 2.77,7.73 Sp O9III dist. 714.29 pc (2330.01 l.y.)

STFA14 AC: 178; 148: Bright white A and very wide, mag 6 B. Did not try for AB, HEI 42, 0.3" 2.41/3.76
05h 32m 00.40s -00° 17' 56.7" P.A. 4.00 sep 56.2 mag 2.41,6.83 Sp O9.5II+

STF 701 AB: 178; 148: White A and pale orange B, wide, 2 delta mag.
05h 23m 18.50s -08° 24' 55.9" P.A. 139.00 sep 6.2 mag 6.13,8.09 Sp B8III dist. 122.7 pc (400.25 l.y.)

STF 721 AB: 178; 148: Easy wide pair, 2 delta mag, white A and light blue B
05h 29m 33.52s +03° 08' 52.5" P.A. 149.00 sep 25.3 mag 7.09,9.14 Sp B5V

STF 724 AB: 178; 148: Easy wide pair, 1 delta mag
05h 30m 17.57s +11° 01' 17.1" P.A. 253.00 sep 6.8 mag 9.30,10.60 Sp A2

A 2705 AB: 178; 296x: Faint B about 1 delta mag, very close split
05h 30m 43.48s +11° 53' 45.4" P.A. 251.00 sep 1.0 mag 9.24,9.95 Sp K0

STF 729 AB: 178; 148x: Very nice tight split, 1 delta mag, fairly bright yellow-white A and light blue B.
05h 31m 14.53s +03° 17' 31.7" P.A. 26.00 sep 1.8 mag 5.71,6.74 Sp B1.5V dist. 348.43 pc (1136.58 l.y.)

STF 731 AB: 178; 148x: White stars, slight magnitude difference, well separated
05h 31m 21.21s -02° 05' 57.1" P.A. 328.00 sep 4.8 mag 8.61,9.16 Sp A0 dist. 401.61 pc (1310.05 l.y.)

STF 734 AB: 178; 222x: White A and 2 delta mag small B, nicely split
05h 33m 07.35s -01° 43' 02.5" P.A. 355.00 sep 1.6 mag 6.67,8.22 Sp B4Vn dist. 315.46 pc (1029.03 l.y.)

BU 13 AB: 178; 222x: Nice 1 delta pair, just split. Burnham notes "In a low-power field with STF 743"
05h 34m 32.43s -04° 29' 14.8" P.A. 144.00 sep 0.8 mag 7.57,9.22 Sp B8V

STF 743 AB: 178; 148x: Obvious but close split, less than 1 delta mag
05h 34m 43.20s -04° 23' 31.5" P.A. 284.00 sep 1.8 mag 7.74,8.25 Sp B5V

STF 747 AB: 178; 148x: Very wide near equal pair
05h 35m 02.68s -06° 00' 07.2" P.A. 224.00 sep 36.3 mag 4.70,5.51 Sp B0.5V+B1V dist. 495.05 pc (1614.85 l.y.)

STF 741 AB: 178; 148x: easy white and wide three delta
05h 34m 56.49s -00° 07' 22.3" P.A. 286.00 sep 10.0 mag 7.14,10.03 Sp B5

STF 746 AB: 178; 148x: Faint, near equal, wide
05h 35m 18.44s -04° 40' 55.9" P.A. 219.00 sep 13.9 mag 10.40,10.70 Sp A0

STT 111 AB: 178; 148x: White and fairly faint B, about 2 delta, light blue B, nicely split.
05h 35m 13.24s +10° 14' 24.2" P.A. 351.00 sep 2.8 mag 5.65,9.68 Sp B9IIIp dist. 343.64 pc (1120.95 l.y.)

STF 754 AB: 178; 148x: Bright yellow-white A and 3 delta mag B, fairly close
05h 36m 35.69s -06° 03' 53.1" P.A. 288.00 sep 5.3 mag 5.71,9.24 Sp B1V dist. 471.7 pc (1538.69 l.y.)

PRT 1 AB: 178; 148x: Unremarkable white stars, very wide 1 delta B
05h 36m 59.80s +00° 06' 00.2" P.A. 136.00 sep 28.9 mag 9.45,10.99 Sp B9

STF 757 AB: 178; 222x: Nice near equal white stars, close split, several other stars appear to be in a group
05h 38m 06.52s -00° 11' 03.5" P.A. 242.00 sep 1.5 mag 7.96,8.33 Sp B6V