Observed with the 6-inch last night. Seeing was good but there were thin high clouds -- or, I should say, typical Bay Area water vapor trapped overhead. Star images were great. I went after Struves mostly at zenith and toward Polaris, saving the more accessible pairs for later. I also observed the pairs using the Tasco 60/1000, using a very nice Nikon zoom I bought. It's converted from a spotting scope zoom and works very well, though it's a little heavy for the focuser, which was designed for 0.965" eyepieces. Great views nonetheless. After I was done with doubles after a couple hours of observing, I had a look at the half illuminated moon. Wow. I just love long focus refractors, the high contrast and sharpness is hard to beat. Even though I can see more detail with the 20-inch, aesthetically, the refractors are so much more pleasing.
STF1544 AB: 152; 125x: 1 Dm, well separated. There is -65% parallax range overlap, it is not binary.
11h 31m 18.57s +59° 42' 03.3" P.A. 91.00 sep 12.2 mag 7.33,8.02 Sp A3+Am dist. 588.24 pc (1918.84 l.y.)
STF1495 AB: 152; 125x: Light orange primary, >1 Dm, wide. -94% parallax range overlap, it is not binary.
10h 59m 49.47s +58° 54' 23.3" P.A. 36.00 sep 34.2 mag 7.25,8.84 Sp K2II-III dist. 226.76 pc (739.69 l.y.)
STF1553 AB: 152; 125x: Pretty pair, closely split, near equal. Was able to split it in the 60mm also. -95% parallax range overlap, it is not binary, in spite of the SOC grade 4 orbit.
11h 36m 35.69s +56° 08' 07.3" P.A. 165.70 sep 6.2 mag 7.73,8.17 Sp G5+K7V dist. 46.99 pc (153.28 l.y.)
STF1546 AB: 152; 125x: Faint B seen with averted vision, then can hold direct, well split. Only 1% parallax range overlap, 690 AU weighted separation, 1.4+0.7 Msol, the radial velocity delta 2.4 is just higher than the escape velocity 2.3, it is not likely binary.
11h 32m 20.34s +56° 05' 43.3" P.A. 349.00 sep 11.4 mag 7.54,10.30 Sp F8 dist. 56.69 pc (184.92 l.y.)
STF1572 AB: 152; 125x: Faint pair, well split. 47% parallax range overlap, 1,420 AU weighted separation, 1.3+1.0 Msol, and the radial velocity delta 1.1 is less than the escape velocity 1.7. It is likely binary and needs an orbit.
11h 47m 00.74s +53° 17' 06.9" P.A. 289.00 sep 10.3 mag 9.46,10.79 Sp G dist. 160.26 pc (522.77 l.y.)
STF1510 AB: 152; 125x: Fairly closely split, 1 Dm, white stars. 29% overlap of the parallax ranges, 309 AU weighted separation, 1.3+0.9 Msol, and the radial velocity delta 1.3 is less than the escape velocity 3.6. It is likely binary. SOC grade 5 orbit 3156-year period.
11h 08m 00.06s +52° 49' 17.9" P.A. 327.70 sep 5.6 mag 7.65,9.03 Sp F8V dist. 55.96 pc (182.54 l.y.)
STF1520 AB: 152; 125x: Well split, 1 Dm, white stars, seen in 60mm also. 79% overlap of the parallax ranges, 482 AU weighted separation, 1.4+1.0 Msol, it might be binary and needs an orbit.
11h 16m 04.03s +52° 46' 23.4" P.A. 344.00 sep 12.4 mag 6.54,7.81 Sp F6V+F9V dist. 34.12 pc (111.3 l.y.)
STF1563 AB: 152; 125x: Wide, almost 1 Dm. 52% parallax range overlap, 1,377 AU weighted separation, 1.4+0.9 Msol, and the radial velocty delta 1.8 is just higher than the escape velocity 1.8. It might be binary and needs an orbit.
11h 39m 23.55s +52° 11' 15.4" P.A. 157.00 sep 13.7 mag 8.58,10.64 Sp G0 dist. 83.47 pc (272.28 l.y.)
STF1587 AB: 152; 125x: B flashes with averted vision only, wide. -15% overlap of the parallax ranges, it is not binary.
11h 59m 50.75s +51° 36' 59.9" P.A. 288.00 sep 16.8 mag 9.26,11.05 Sp G0 dist. 328.95 pc (1073.03 l.y.)
STF1562 AB: 152; 125x: Very faint pair, wide, B seen with averted vision. -18% overlap of the parallax ranges, it is not binary.
11h 39m 13.51s +49° 09' 32.1" P.A. 270.00 sep 16.2 mag 9.76,11.60 Sp K0
STF1570 AB: 152; 125x: Well split near equal pair. -48% overlap of the parallax ranges, it is not binary.
11h 45m 32.15s +45° 36' 13.1" P.A. 49.00 sep 10.9 mag 8.86,9.60 Sp F0 dist. 110.74 pc (361.23 l.y.)
STF1581 AB: 152; 200x: Very fine split, 1 Dm, split with 125x but better with higher power, nice. -27% overlap of the parallax ranges, it is not binary.
11h 56m 06.32s +45° 32' 44.8" P.A. 171.00 sep 2.5 mag 9.80,10.44 Sp F8 dist. 381.68 pc (1245.04 l.y.)
STF1561 AB: 152; 125x: Light yellow, 1 Dm, well split, classic Struve. -65% overlap of the parallax ranges, it is not binary in spite of the SOC grade 5 orbit.
11h 38m 44.90s +45° 06' 30.3" P.A. 245.50 sep 8.9 mag 6.53,8.23 Sp G0V dist. 23.25 pc (75.84 l.y.)
STF1574 AB: 152; 125x: Wide faint pair. -18% overlap of the parallax ranges, it is not binary.
11h 51m 14.21s +44° 04' 49.7" P.A. 6.00 sep 9.4 mag 9.60,12.30 Sp G
STF1585 AB: 152; 125x: B seen with averted vision, well split. 86% overlap of the parallax ranges, 1,516 AU weighted separation, 2.3+1.4 Msol, but the radial velocity delta 2.4 is slightly more than the escape velocity 2.1, it may be physical but not remain binary, though an orbit should be tried.
11h 56m 40.53s +41° 01' 30.2" P.A. 106.00 sep 5.5 mag 8.79,11.08 Sp K0III dist. 386.1 pc (1259.46 l.y.)
STF1408 AB: 152; 125x: Fine pair, faint, <1 Dm, well split. 6% overlap of the parallax ranges, 481 AU weighted separation, 1.4+1.1 Msol, and the radial velocity detla 0.9 is less than the escape velocity 3.1. It might be binary and needs an orbit tried.
10h 11m 21.83s +73° 02' 12.4" P.A. 14.00 sep 3.7 mag 9.01,9.98 Sp F2 dist. 137.17 pc (447.45 l.y.)
STF1393 AB: 152; 125x: Faint near equal pair, well split. 99% overlap of the parallax ranges, 3,386 AU weighted separation, 1.7+1.5 Msol, and the radial velocity delta 0.6 is less than the escape velocity 1.3. It likely is binary and needs an orbit.
10h 01m 56.54s +73° 34' 07.1" P.A. 254.00 sep 9.7 mag 10.41,10.95 Sp F8 dist. 1492.54 pc (4868.67 l.y.)
STF1409 AB: 152; 125x: B seen with averted vision only, wide. -79% parallax range overlap, it is not binary.
10h 15m 57.60s +79° 28' 10.0" P.A. 193.00 sep 19.3 mag 9.65,11.23 Sp F0 dist. 282.49 pc (921.48 l.y.)
STF1437 AB: 152; 125x: Near equal, very wide. 6% parallax range overlap, 2.2+1.1 Msol. It might be binary and needs an orbit.
10h 34m 13.45s +73° 50' 04.1" P.A. 291.00 sep 23.4 mag 7.59,10.41 Sp A3 dist. 185.53 pc (605.2 l.y.)
STF1516 AC: 152; 125x: Closely split 2 Dm, B brightens with averted vision. 84% parallax overalap, only 95 AU weighted separation, 0.7+0.3 Msol, and the radial velocity delta 2.6 is less than the escape velocity 4.3, SOC grade 5 orbit 2774-year period. AB is not binary.
11h 15m 11.91s +73° 28' 30.7" P.A. 103.00 sep 67.6 mag 7.77,8.23 Sp K5 dist. 14.65 pc (47.79 l.y.)
STF1551 AB: 152; 125x: Very faint B seen directly and brightens with averted vision. 81% overlap of the parallax ranges, 1,471 AU weighed separation, 1.9+1.2 Msol, and the radial velocity delta is the same as the escape velocity 1.9. It may or may not remain binary, but an orbit should be tried.
11h 35m 18.37s +70° 48' 08.5" P.A. 111.00 sep 6.8 mag 9.02,10.80 Sp G5 dist. 258.4 pc (842.9 l.y.)
STF1573 AB: 152; 125x: Nice! significant delta magnitude, well split, seems to be in front of a faint cluster of stars, also seen with 60mm. -21% overlap of the parallax ranges, it is not binary.
11h 49m 10.50s +67° 19' 42.8" P.A. 180.00 sep 10.9 mag 7.50,8.30 Sp G8III dist. 326.8 pc (1066.02 l.y.)
STF1410 AB: 152; 125x: Faint, nearly 1 Dm, well split. 41% overlap of the parallax ranges, 2,813 AU weighted separation, 2.0+1.2 Msol, but the radial velocity delta 2.2 exceeds the escape velocity 1.4, so it likely is not binary, though an orbit should be tried.
10h 37m 11.15s +86° 03' 28.3" P.A. 344.00 sep 14.4 mag 8.32,10.48 Sp F2
STF1654 AB: 152; 125x: White, 1 Dm stars, closely split. Could split in 60mm with high power. -11% overlap of the parallax ranges, it is not binary.
12h 32m 02.94s +74° 48' 41.5" P.A. 23.00 sep 3.8 mag 7.74,9.43 Sp G9III dist. 233.1 pc (760.37 l.y.)
STF1588 AB: 152; 125x: Slight delta mag, wide. -97% parallax range overlap, it is not binary.
12h 02m 16.03s +72° 21' 43.1" P.A. 34.00 sep 11.7 mag 9.61,10.13 Sp K2 dist. 1369.86 pc (4468.48 l.y.)
STF1590 AB: 152; 125x: 2 Dm, closely split. 16% overlap of the parallax ranges, 979 AU weighted separation, 2.6+1.2 Msol, but the radial velocity delta 3.7 exceeds the escape velocity 2.6, it will not remain binary if it is so.
12h 01m 37.88s +70° 50' 59.6" P.A. 235.00 sep 5.4 mag 7.42,10.11 Sp K1III-IV dist. 157.23 pc (512.88 l.y.)
STF1626 AB: 152; 200x: Wonderful near equal white stars, split with 125x but better seen at 200x. 24% parallax range overlap, 354 AU weighted separation, 1.5+1.4 Msol, so it might be binary and needs an orbit.
12h 16m 47.11s +70° 08' 45.7" P.A. 2.00 sep 2.1 mag 9.37,9.55 Sp G0 dist. 157.98 pc (515.33 l.y.)
STF1602 AB: 152; 125x: Wide, 1 Dm, rather pretty. -92% parallax range overlap, it is not binary.
12h 07m 07.57s +69° 04' 34.5" P.A. 180.00 sep 21.0 mag 8.27,9.91 Sp G5 dist. 90.42 pc (294.95 l.y.)
STF1599 AB: 152; 125x: The whole group is a lovely asterism, likely measured just for the fun of it to see if any change over time. It's likely to be a co-moving group: AB has 52% overlap of the parallax ranges, 2,094 AU weighted separation, 2.7+1.1 Msol, but the radial velocity delta 4.8 far exceeds the escape veloctiy 1.8.
12h 05m 33.52s +68° 47' 39.7" P.A. 166.00 sep 10.1 mag 7.50,10.67 Sp K1III dist. 277.78 pc (906.12 l.y.)
STF1611 AB: 152; 125x: Very nice, very closely split with 200x, nearly 1 Dm. 41% parallax range overlap, 369 AU weighted separation, 1.7+1.2 Msol, so it might be binary and needs an orbit.
12h 11m 57.69s +68° 36' 10.5" P.A. 4.00 sep 1.9 mag 9.16,10.51 Sp F8
STF1614 AB: 152; 125x: Wide B is 2 Dm to the primary. -46% parallax range overlap, it is not binary.
12h 13m 07.94s +67° 04' 24.4" P.A. 191.00 sep 18.7 mag 8.65,11.29 Sp F8 dist. 106.38 pc (347.01 l.y.)
STF1640 AB: 152; 125x: Wide and faint B. -98% parallax range overlap, it is not binary.
12h 24m 20.14s +63° 47' 36.0" P.A. 244.00 sep 37.9 mag 8.57,10.70 Sp K0 dist. 1162.79 pc (3793.02 l.y.)
STF1671 AB: 152; 125x: Faint near equal wide pair. -32% parallax range overlap, it is not binary.
12h 41m 04.48s +68° 30' 57.9" P.A. 201.00 sep 29.0 mag 9.30,11.04 Sp F2V dist. 165.02 pc (538.3 l.y.)
STF1698 AB: 152; 125x: Near equal wide pair. 81% parallax range overlap, 1,519 AU weighted separation, 1.3+1.2 Msol, and the radial velocity delta 0.5 is less than the escape velocity 1.7. It is likely binary and needs an orbit.
12h 54m 47.82s +74° 39' 06.1" P.A. 109.00 sep 10.1 mag 9.64,10.24 Sp A2
STF1767 AB: 152; 125x: Near equal well split pair. 52% parallax range overlap, 318 AU weighted separation, 1.0+1.0 Msol, it is probably binary. SOC grade 5 orbit 3242-year period.
13h 34m 06.04s +67° 46' 07.9" P.A. 349.30 sep 4.5 mag 9.26,9.56 Sp G1V dist. 69.4 pc (226.38 l.y.)
STF1717 AB: 152; 125x: Very faint, very wide pair. -52% overlap of the parallax ranges, it is not binary.
12h 28m 28.09s +88° 40' 32.4" P.A. 323.00 sep 8.3 mag 9.42,10.81 Sp F
STF1761 AB: 152; 125x: Near equal, wide, light orange stars. No Gaia data on the primary.
13h 32m 01.67s +71° 43' 01.3" P.A. 71.00 sep 20.3 mag 9.30,10.10 Sp F8+F8 dist. 151.29 pc (493.51 l.y.)
STF1771 AB: 152; 200x: Narrowly split with 200x, 1 Dm, nice pair. 53% parallax range overlap, 194 AU weighted separation, 1.4+1.2 Msol. Likely binary and needs an orbit.
13h 36m 41.90s +69° 46' 36.2" P.A. 83.00 sep 1.8 mag 8.77,9.37 Sp F5 dist. 98.14 pc (320.13 l.y.)
STF1798 AB: 152; 125x: 2 Dm, fairly wide. 24% parallax range overlap, 967 AU weighted separation, 1.9+1.2 Msol, and the radial velocity delta 2.0 is less than the escape velocity 2.4, it is likely binary and needs an orbit.
13h 55m 02.30s +78° 23' 59.2" P.A. 11.00 sep 7.5 mag 7.67,9.65 Sp F2 dist. 124.53 pc (406.22 l.y.)
STF1887 AB: 152; 125x: 1 Dm, fairly closely split. -38% parallax range overlap, it is not binary.
13h 54m 57.46s +87° 23' 44.1" P.A. 227.00 sep 3.6 mag 9.18,11.20 Sp B9 dist. 176.99 pc (577.34 l.y.)
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