22 september 2021

This was a night with seeing forecasted as being merely average, so I observed with the 6-inch.  I spent a while on the double-double in Lyra, admiring the perfect star images and single diffraction rings.  I observed many more throughout Lyra which I knew I had observed before, so I didn't take notes.  I started taking notes when I cam across a striking pair in southern Lyra:

BU 1326 AB: 152; 175x: Very extremely fine B is split with seeing and with averted vision only, blue to A's white.  Very, very fine.  WDS is uncertain, and I can't find data on the primary in Gaia.

18h 26m 40.93s +26° 26' 57.2" P.A. 107.00 sep 5.5 mag 6.48,12.10 Sp B3V dist. 321.54 pc (1048.86 l.y.)

STT 359 AB: 152; 175x: Light orange near equal stars, notched elongation, overlapping disks.  Physical with a 219-year period, at apastron now.  Again no Gaia data.

18h 35m 30.40s +23° 36' 19.9" P.A. 3.50 sep 0.8 mag 6.35,6.62 Sp G9III-IV dist. 144.3 pc (470.71 l.y.)

STF 2401 AB: 152; 175x: White, 2 delta mag, well separated.  
18h 48m 57.83s +21° 10' 01.3" P.A. 38.00 sep 4.1 mag 7.27,9.27 Sp B3V dist. 2941.18 pc (9594.13 l.y.)

STF 2360 AB: 152; 175x: ! very fine, faint 1 delta mag light yellow-orange, close split.

18h 39m 19.16s +20° 55' 58.9" P.A. 358.00 sep 2.4 mag 7.97,9.16 Sp B5IV dist. 2500 pc (8155 l.y.)

STF 2415 AB: 152; 175x: ! Light yellow-white A and blue B closely split, just a little more than 1 delta mag, very fine.

18h 54m 32.84s +20° 36' 55.1" P.A. 290.00 sep 2.0 mag 7.07,8.73 Sp A0IV dist. 194.93 pc (635.86 l.y.)

STF 2445 AB: 152; 175x: Clean white A and slightly red B, 1 delta mag, wide.  A slightly fainter red star is at the edge of the field.  

19h 04m 38.50s +23° 19' 45.5" P.A. 262.00 sep 12.4 mag 7.25,8.57 Sp B2Ve dist. 476.19 pc (1553.33 l.y.)

STF 2457 AB: 152; 175x: Very faint B seen with averted vision only, around 2" separation.

19h 07m 08.02s +22° 35' 03.7" P.A. 201.00 sep 10.2 mag 7.46,9.52 Sp A7IV dist. 95.15 pc (310.38 l.y.)

BU 248 AB: 152; 175x: Bright yellow-white A and very faint B, just seen with direct vision, closely split.  

19h 17m 43.64s +23° 01' 32.0" P.A. 128.00 sep 1.8 mag 5.43,8.75 Sp B0.5IV dist. 373.13 pc (1217.15 l.y.)