25 august 2021

Had a really nice night out with the 6-inch. Seeing was good, and transparency was a little hurt by wildfire smoke and later the marine layer. But really lovely images from the scope and very satisfying.

STF 2758 AB: 152; 175x: 61 Cyg. Stunning pair, yellow A and orange B, half delta mag, wide. Spectral class K5V+K7V (yellow-orange/yellow-orange). Only 11.38 light years away! Physical with a 618.6911-year period, it is now at apastron.  There are 18 stars in the system but none of the visible ones are, and those only detected in K-band are uncertain.
21h 06m 53.95s +38° 44' 57.9" P.A. 153.50 sep 31.9 mag 5.20,6.05 Sp K5V+K7V dist. 3.49 pc (11.38 l.y.)

Sei 1445 AB: 152; 175x: White A, wide faint B is visible with averted vision only.  WDS says physical, and there is 90% parallax range overlap.  Weighted distance is a bit far, at 15,647 AU, however the primary star is 4.24 solar mass and the companion 1.46, so it likely is.
21h 12m 29.51s +38° 33' 59.4" P.A. 23.00 sep 27.9 mag 7.32,11.90 Sp B9 dist. 2325.58 pc (7586.04 l.y.)

STT 434 AB: 152; 175x: Yellow-white and almost red color faint & wide B.  WDS says physical but there's no parallax data, so that's based on proper motions only.
21h 19m 00.03s +39° 44' 57.6" P.A. 122.00 sep 24.4 mag 6.67,9.93 Sp B9V dist. 143.88 pc (469.34 l.y.)

STT 432 AB: 152; 175x: Very fine split, 1 delta mag, blue-white A.  WDS uncertain, but there is no parallax overlap (-71%), so not gravitationally bound -- just a very close line of sight split.

21h 14m 18.94s +41° 08' 48.0" P.A. 116.00 sep 1.3 mag 7.78,8.05 Sp F8V dist. 244.5 pc (797.56 l.y.)

STTA 214 AB: 152; 175x: Wide, 2 delta mag, yellow-white.  WDS physical on proper motion, don't find the B star's data

21h 03m 52.13s +41° 37' 41.4" P.A. 185.00 sep 57.4 mag 6.37,8.64 Sp F3IV dist. 96.34 pc (314.26 l.y.)

STT 423 AB: 152; 175x: Excellent, 2 delta mag close pair, white, nice split.  WDS uncertain, but it is almost certain to be gravitationally bound: 46% parallax range overlap, 1,239 AU weighted separation, 3.96 & 2.25 solar mass.

20h 55m 17.96s +42° 30' 48.6" P.A. 76.00 sep 2.7 mag 7.12,9.64 Sp B9 dist. 418.41 pc (1364.85 l.y.)

STT 414 AB: 152; 175x: Wide 1 delta yellow-white pair.  WDS uncertain but likely physical: 27% parallax range overlap, 4,686 AU weighted separation, 3.78/2.65 solar mass.
20h 47m 09.92s +42° 24' 35.4" P.A. 95.00 sep 9.9 mag 7.43,8.93 Sp B7V dist. 353.36 pc (1152.66 l.y.)

Stu 13 AB: 152; 175x: 2 delta mag, wide, white.  WDS says physical based on proper motion, but there is no parallax range overlap, so it is not.

20h 34m 56.52s +41° 43' 04.1" P.A. 196.00 sep 27.2 mag 7.57,10.13 Sp B9

STT 410 AB: 152; 245x: Near equal, hairline split at best moments at 175x, good split at 245x.  Blue-white stars with perfect airy disks!  Physical with 1152-year period, is is nearing periastron and will make a relatively quick turn around the primary in the coming decades.

20h 39m 33.31s +40° 34' 46.8" P.A. 3.20 sep 0.9 mag 6.73,6.83 Sp B8IIIpMn dist. 283.29 pc (924.09 l.y.)

STF 2731 AB: 152; 175x: Faint and fairly wide B, 2 delta mag.  WDS uncertain, and there is no overlap in their parallax ranges, so not physical.

20h 49m 00.64s +39° 47' 29.9" P.A. 86.00 sep 4.1 mag 7.65,9.59 Sp B9IV dist. 497.51 pc (1622.88 l.y.)

STF 2762 AB: 152; 175x: Light yellow and 2 delta mag deeper yellow-orange B, in the middle a Sagitta-like asterism.  V389 Cyg.  WDS physical based on proper motions; however there is no overlap in their parallax ranges, so they are not.

21h 08m 38.87s +30° 12' 20.5" P.A. 303.00 sep 3.4 mag 5.70,8.10 Sp B9V dist. 115.74 pc (377.54 l.y.)

BU 445 AB: 152; 175x: Easy, wide faint B.  WDS physical based on proper motions.  There's only 2% parallax range overlap, however it's only 911 AU separated with 2.91 and 1.02 solar masses, so very likely gravitationally bound.  Discovered with the 18.5-inch Dearborn at 4.6"

21h 03m 29.53s +29° 05' 33.0" P.A. 109.00 sep 4.7 mag 7.00,11.14 Sp G8III dist. 197.24 pc (643.4 l.y.)

BU 167 AB: 152; 175x: B seen with averted vision only, well separated.  WDS says physical but surprisingly there is no parallax range overlap, not.  Discovered with 6-inch at 1.5"

21h 36m 13.98s +30° 03' 19.5" P.A. 89.00 sep 1.7 mag 6.37,9.95 Sp G8III dist. 110.86 pc (361.63 l.y.)

STF 2822 AB: 152; 175x: Very pretty color contrast, yellow and orange, 2 delta mag.  Physical with a 692.0588-year period, it is coming off periastron and will slowly widen.

21h 44m 08.57s +28° 44' 33.4" P.A. 323.40 sep 1.5 mag 4.75,6.18 Sp F6V+G2V dist. 22.24 pc (72.55 l.y.)

 

BU 692 AB: 152; 175x: Extremely faint ghost of a point, very close about 2" separated.  WDS uncertain, and there is no overlap in their parallax range.  Discovered with 18.5-inch at 2.5"

21h 50m 05.37s +31° 50' 52.4" P.A. 10.00 sep 2.9 mag 7.47,11.03 Sp K0 dist. 181.16 pc (590.94 l.y.)

HO 178 AB: 152; 175x: Extremely faint B seen averted vision only, close but fairly well split.  WDS physical based on proper motions, but there is no overlap in the parallax range, so not.

22h 11m 28.36s +32° 05' 09.9" P.A. 221.00 sep 3.4 mag 7.40,11.16 Sp F0 dist. 121.8 pc (397.31 l.y.)

STF 2881 AB: 152; 175x: Nice!  Hairline at best moments, unequal <1 delta mag.  Physical with a 1345-year period, it will very slowly widen. 

22h 14m 34.67s +29° 34' 20.6" P.A. 70.50 sep 1.2 mag 7.65,8.24 Sp F6III dist. 171.53 pc (559.53 l.y.)

I spent some time looking at Jupiter, which was really good and detailed, and watched Io very slowly disappear behind Jupiter's limb.  Ganymede was near to Io and it was very easy to tell a size difference between the two, Io about half the size.  I switched over to the moon which had just cleared a neighbors roof, and it looked foreign in this post-full stage.  Europa was to do a shadow transit later but the marine layer moved in to close the show.