I switched over to the 20-inch and had a good night from 10:30pm to 12:30am. Seeing was variable, 6/10 mostly but there was a streak of ~7/10 and I went after close pairs. I stayed at 20-inch, with the apodising mask, throughout since I was a bit tired of the 8-inch mask.
The 20-inch still kills the 6-inch and is the better scope. But what the 6-inch is for -- solar, lunar, planetary -- it does very well.
STT 524 AB: 508; 533x: Suspected hairline with 333x, nice clean split at 533x, white stars, significant magnitude difference, ~0.5". 686 year period.
18H 07M 29.52S +19° 39' 59.1" P.A. 205.4 SEP 0.49 MAG 7.89,8.87 SP A3V DIST. 225.73 PC (736.33 L.Y.)
STF 2289 AB: 508; 333x: Nice pale yellow stars, ~1 delta mag, >1" separation. 3040 year period
18H 10M 08.69S +16° 28' 35.0" P.A. 215.3 SEP 1.24 MAG 6.65,7.21 SP A0V+G0III DIST. 263.85 PC (860.68 L.Y.)
GII 110 CD; 508; 533x: With seeing, very significant delta mag ~2 delta mag, white stars, very tight but split. Suspected @ 333x. [Discoverer is amateur Rene Gili, who observes with the large refractors at the Nice Observatory, this pair was discovered in 2016 via CCD-- the discovery measure is the only one in WDS so far]
18H 14M 37.03S +23° 35' 01.6" P.A. 301 SEP 0.9 MAG 9.40,11.90 SP A3
STT 346 AB: 508; 205x: Nice pale yellow-white stars, >1 delta mag, >4" separation
18H 15M 25.05S +19° 46' 13.4" P.A. 329 SEP 5.2 MAG 8.33,9.01 SP F2 DIST. 113.64 PC (370.69 L.Y.)
STF 2309 AB: 508; 205: Wide ~4", white stars, ~1 delta mag. Not physical
18H 20M 06.84S +25° 31' 53.0" P.A. 352 SEP 3.6 MAG 9.31,9.95 SP A0 DIST. 180.51 PC (588.82 L.Y.)
STF 2310 AB: 508; 205x: Bright white A and faint dull wide B, ~3 delta mag, wide ~6"
18H 20M 38.67S +22° 47' 50.7" P.A. 235 SEP 5.1 MAG 6.83,9.98 SP B8III DIST. 302.11 PC (985.48 L.Y.)
STF 2312 AB: 508; 205x: Very fine white stars, >1 delta mag, ~1.5"
18H 21M 09.08S +28° 20' 03.5" P.A. 341 SEP 1.7 MAG 9.28,9.91 SP A0 DIST. 404.86 PC (1320.65 L.Y.)
COU 505 AB: 508; 333x: Very faint pair, ~1 delta mag, split firmly with seeing, ~1" separation
18H 21M 16.17S +24° 09' 06.1" P.A. 318 SEP 1.1 MAG 11.02,11.29 SP F8
HO 430 AB: 508; 205x: Blue-white A and dull white B, ~2 delta, wide ~2". Nice looking pair [not physical]
18H 21M 37.31S +20° 30' 11.5" P.A. 194 SEP 2.5 MAG 9.62,10.73 SP A5
BU 641 AB: 508; 533x: V989 Her. Seen as a snowman dot to bright white A @ 333x, split with 533x, inside first diffraction ring. Need A's disk to be perfectly tight for B to resolve with seeing. Very nice. 1" at discovery 1878 with Dearborn 18.5-inch
18H 21M 48.44S +21° 30' 27.9" P.A. 341 SEP 0.8 MAG 7.03,8.66 SP B9.5II DIST. 264.55 PC (862.96 L.Y.)
STF 2314 AB: 508; 205x: Fine pair, wide ~2.5", ~1 delta mag
18H 23M 25.75S +23° 27' 19.1" P.A. 331 SEP 2.7 MAG 9.02,10.31 SP G5 DIST. 76.45 PC (249.38 L.Y.)
STF 2315 AB: 508; 533x: Barely split with seeing, resolves to two disks, more than hairline but almost 2 delta mag, very tough, need perfect seeing. 2094 year period
18H 24M 58.46S +27° 23' 41.3" P.A. 115.3 SEP 0.6 MAG 6.57,7.77 SP A0V+A4V DIST. 117.51 PC (383.32 L.Y.)
AG 361 AB: 508; 205x : Near equal white stars, wide ~4", in a busy field [not physical]
18H 25M 07.89S +26° 54' 09.6" P.A. 13 SEP 3.8 MAG 10.65,10.97 SP G5
STF 2317 BC: 508; 533x: Very challenging. AB is obvious, A a bright light orange, B is blue and faint -- with careful examination I do get a scintillating small balls separated ~1" and near equal -- averted vision brightens these to pinpoints but I can't hold that resolution direct. Stelle Doppie says first measure of this pair is in 1901, so it's not a Struve discovery, likely Aitken or Hussey with the Lick 36-inch.
18H 25M 19.45S +26° 04' 45.9" P.A. 315 SEP 1.4 MAG 12.50,12.70 DIST. 269.54 PC (879.24 L.Y.)
STF 2319 AB: 508; 205x: Yellow-white near equal wide stars, in a plus one which is ~1 delta fainter wide perpendicular PA (this is the AC pair)
STT 359 AB: 508; 333x: Light yellow near equal split, very close. 219 year period.
18H 35M 30.40S +23° 36' 19.9" P.A. 3.7 SEP 0.75 MAG 6.35,6.62 SP G9III-IV DIST. 144.3 PC (470.71 L.Y.)
STF 2345 AB: 508; 205: V998 Her. Wide one delta [The A star is variable is an eclipsing binary but the eclipsing component is apparently only detectable with speckle interferometry; the Struve pair is not physical]
18H 35M 31.17S +21° 04' 27.1" P.A. 226 SEP 12.3 MAG 9.08,10.48 SP G DIST. 121.36 PC (395.88 L.Y.)
STT 358 AB: 508; 205x: Yellow-white stars, half delta mag, well split. 380 year period
18H 35M 53.22S +16° 58' 32.5" P.A. 144.3 SEP 1.49 MAG 6.94,7.08 SP F8V DIST. 32.88 PC (107.25 L.Y.)
A 249 AB 508; 333x: Fine pair, equal white, nicely split ~1"
18H 36M 03.12S +24° 51' 49.3" P.A. 275 SEP 1.1 MAG 10.14,10.20 SP F5
STF 2360 AB: 508; 205x: White, ~2 delta mag, wide ~3"
18H 39M 19.16S +20° 55' 58.9" P.A. 358 SEP 2.4 MAG 7.97,9.16 SP B5IV DIST. 2500 PC (8155 L.Y.)
STF 2401 AB: 508; 205x: Attractive pale yellow and white stars, wide ~4", ~2 delta
18H 48M 57.83S +21° 10' 01.3" P.A. 38 SEP 4.1 MAG 7.27,9.27 SP B3V DIST. 2941.18 PC (9594.13 L.Y.)
STF 2415 AB: 508; 205x: ~2 delta, ~2", light yellow A
18H 54M 32.84S +20° 36' 55.1" P.A. 290 SEP 2 MAG 7.07,8.73 SP A0IV DIST. 194.93 PC (635.86 L.Y.)
COU 511 Aa-Ab: 508; 533x: ! Wow great pair. A star rather bright with B very close-in, ~1 delta mag, the tiniest pin prick <1" separated from A.
18H 55M 23.68S +23° 24' 00.1" P.A. 190 SEP 0.8 MAG 9.73,9.88 SP G0
HU 332 AB: 508; 533x: Beautiful close split, a little more than hairline, light orange stars near equal
18H 59M 03.72S +22° 30' 03.2" P.A. 259 SEP 0.4 MAG 9.72,9.61 SP G0
J 1280 AB: 508; 205x: Faint pair slight mag difference, wide ~3". Not physical
19H 01M 00.47S +22° 05' 34.5" P.A. 108 SEP 3.9 MAG 11.70,12.00
A 2991 AB: 508; 333x: Suspect elongation with 205x. B has a significant mag difference than A, maybe half delta, very closely separated <1"
19H 03M 23.53S +25° 11' 19.6" P.A. 82 SEP 0.7 MAG 10.44,10.82 SP F2
STF 2445 AB: 508; 205x: Lovely wide pair, ~2 delta mag, light yellow A and dull B
19H 04M 38.50S +23° 19' 45.5" P.A. 262 SEP 12.4 MAG 7.25,8.57 SP B2VE DIST. 476.19 PC (1553.33 L.Y.)
BU 359 AB: 508; 205x: In the same field as STF 2445, and is a smaller and flipped analog of it. It's the opposite PA dimmer but with similar mag difference, just smaller scale. Not physical.
19H 05M 09.69S +23° 25' 57.0" P.A. 82 SEP 4.7 MAG 8.81,9.79 SP F2
STF 2455 AB: 508; 205x: Wide ~2 delta mag, light yellow-white A and dull B. Not physical
19H 06M 53.00S +22° 10' 21.5" P.A. 28 SEP 9.6 MAG 7.42,9.44 SP F4IV DIST. 68.59 PC (223.74 L.Y.)
STF 2457 AB: 508; 205x: Wide two delta mag.
19H 07M 08.02S +22° 35' 03.7" P.A. 201 SEP 10.2 MAG 7.46,9.52 SP A7IV DIST. 95.15 PC (310.38 L.Y.)
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