A bit of a frustrating night. Seeing was predicted to be good, so I opened up the 20-inch shed's door to let it cool. I also uncovered the Dalton, expecting to use it and keep star testing it. I still get flaring with moderately bright stars, such as Izar, which I could not resolve. The star test outside of focus looks to have pinched corners and a bright doughnut in the middle part of the rings. Inside focus barely resolves any rings. It's an indication of overcorrection. I received my Ronchi eyepiece and pointed at Vega, the only conveniently placed bright star. At 10 bands across the field, the bars are nice and sharp indicating it's smooth, but inside and outside focus show bars bending in and out, confirming the overcorrection. I forgot to test with a green filter, so maybe the results would be different, and I need to force myself to give it more time. I realize a larger aperture will be worse on bright stars, but I wasn't expecting these issues.
When I put the Ronchi on my 20-inch (Zambuto mirror), the lines are perfectly straight. And I could well resolve Izar with the 8-inch mask with only moderate bloating of A. This was a couple hours after using the Dalton, so seeing might be better, but it still tells me something is wrong. I'll give it more time and try my best to test it and give it a fair shot. But I'm already thinking to contact someone who I think knows what they're doing around refractors and might be able to assess it (he lives in another state so it would mean shipping the objective).
After not getting good results from the Dalton, I switched over to the 20-inch. I attempted some movement pairs at first but seeing really could not support it -- it had grown colder, and I think the air was eddying at my low elevation. I switched to a 7-inch mask and had a good enough time chasing some more close Struves -- this is what I'm supposed to do with the Dalton but no dice!
STF1728 AB: 508; 1270x: Diadem, Alpha Com. Slight NE-SW elongation all powers. Currently 0.19", it needs 4-5 more years to move across the primary and become more resolvable. SOC grade 1 orbit, 25.85-year period.
13h 09m 59.28s +17° 31' 46.0" P.A. 195.00 sep 0.189" mag 4.85,5.53 Sp F5V+F6V dist. 17.83 pc (58.16 l.y.)
RST4529 AB: 508; 1010x: Snowman with a NW PA, light orange. SOC grade 2 orbit, 22.89-year period, it will reach apastron to the south in 2030.
14h 31m 00.74s -05° 48' 08.3" P.A. 262.00 sep 0.2 mag 8.81,8.39 Sp G3.5V+G9V dist. 41.14 pc (134.2 l.y.)
STF1833 AB: 178; 140x. Equal, white, wide. -9% PRO, with 245 AU WS, 1.1+1.1 Msol, and RVD 0.0 < EV 4.0, it might've been binary except for the parallax, it is likely they are comoving only.
14h 22m 38.65s -07° 46' 04.3" P.A. 175.00 sep 6.0 mag 7.51,7.52 Sp G0V+G0V dist. 39.42 pc (128.59 l.y.)
STF1838 AB: 178; 140x: Equal white wide. 21% PRO, 354 AU WS, 1.1+1.0 Msol, RVD 0.2 < EV 3.3, it is likely binary and needs an orbit.
14h 24m 05.76s +11° 14' 49.1" P.A. 335.00 sep 9.4 mag 7.47,7.73 Sp F8V+G1V dist. 37.08 pc (120.95 l.y.)
STF1819 AB: 178; 280x: Beautiful hairline split, white stars, slightly unequal. No parallax data for the primary.
14h 15m 19.38s +03° 07' 52.6" P.A. 155.00 sep 0.9 mag 7.73,7.92 Sp F8V dist. 40.57 pc (132.34 l.y.)
STF1825 AB: 178; 140x: White A and yellow B, slight delta magnitude, well separated. 31% PRO, 147 AU WS, 1.3+0.8 Msol, it might be binary and needs an orbit.
14h 16m 32.84s +20° 07' 18.7" P.A. 154.00 sep 4.2 mag 6.47,8.42 Sp F6V dist. 32.63 pc (106.44 l.y.)
14h 44m 48.13s +07° 42' 04.0" P.A. 94.00 sep 6.9 mag 7.96,8.35 Sp G5III dist. 232.56 pc (758.61 l.y.)
STF1813 AB: 178; 140x: Near equal white stars, wide. -3% PRO, 863 AU WS, 1.9+1.8 Msol, RVD 0.1 < EV 2.8, it is possible to be binary and needs an orbit tried.
14h 13m 24.23s +05° 24' 03.2" P.A. 193.00 sep 4.6 mag 8.45,8.63 Sp A7IV dist. 230.41 pc (751.6 l.y.)
STF1866 AB: 178; 510x: Hairline split with seeing, near equal light orange stars. 78% PRO, 271 AU WS, 2.7+2.7 Msol, it is very likely binary and needs an orbit.
14h 41m 44.64s +09° 31' 39.4" P.A. 207.00 sep 0.8 mag 8.48,8.65 Sp G5 dist. 456.62 pc (1489.49 l.y.)
STF1807 AB: 178; 140x: Slightly unequal, very wide. 26% PRO, 402 AU WS, 1.1+1.0 Msol, it is possibly binary and needs an orbit tried.
14h 11m 20.52s -03° 20' 18.7" P.A. 29.00 sep 6.5 mag 8.41,8.73 Sp F8 dist. 75.13 pc (245.07 l.y.)
BU 113 AB: 508; 280x: Close split, 2 Dm, delicate, light yellow A and light orange B. -84% PRO, it is not binary, contrary to the SOC grade 5 orbit.
13h 29m 06.11s +11° 28' 10.1" P.A. 271.00 sep 1.7 mag 8.73,10.66 Sp K0 dist. 58 pc (189.2 l.y.)
STF1865 AB: 508; 850x: White A is too bright to resolve further, I detect it to be very weakly out of round but tough to tell PA, possibly NW. SOC grade 2 orbit, it is coming off periastron and should be resolvable by 2030.
14h 41m 08.92s +13° 43' 42.0" P.A. 265.00 sep 0.1 mag 4.46,4.55 Sp A0V+A0V dist. 53.88 pc (175.76 l.y.)
STF1837 AB: 178; 280x: Lovely close split, nearly 2 Dm, light yellow-white stars. No Gaia parallax data. SOC grade 4 orbit, 1566-year period, it is rapidly closing to periastron and will need more aperture to resolve over the next few decades.
14h 24m 40.84s -11° 40' 10.9" P.A. 270.00 sep 1.3 mag 6.87,7.94 Sp F5III dist. 90.5 pc (295.21 l.y.)
STF1835 A-BC: 178; 200x: Very pretty cream white A and light yellow-orange B, nearly 2 Dm. No parallax data for the secondary.
14h 23m 22.74s +08° 26' 47.9" P.A. 197.00 sep 6.4 mag 5.03,6.78 Sp A0V+F2V dist. 65.92 pc (215.03 l.y.)
STF1910 AB: 178; 140x: Near equal close white stars. 31% PRO, 134 AU WS, 1.1+1.0 Msol, RVD 0.2 < EV 5.2, it is probably binary and needs an orbit.
15h 07m 32.95s +09° 13' 33.8" P.A. 211.00 sep 3.9 mag 7.35,7.54 Sp G2V+G3V dist. 31.56 pc (102.95 l.y.)
STF1879 AB: 178; 140x: Very delicate white stars, close pair, 1 Dm. -31% PRO, it is not likely binary, despite the SOC grade 3 orbit.
14h 46m 15.58s +09° 38' 48.2" P.A. 82.00 sep 1.7 mag 7.79,8.45 Sp G2V dist. 43.22 pc (140.98 l.y.)
STF1904 AB: 178; 140x: Equal white stars, wide. 93% PRO, 843 AU WS, 1.7+1.6 Msol, RVD 0.2 < EV 2.7, it is probably binary and needs an orbit.
15h 04m 06.44s +05° 29' 34.2" P.A. 348.00 sep 10.1 mag 7.19,7.37 Sp F2IV+F0V dist. 75.76 pc (247.13 l.y.)
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