11 July 2023

Clear nights this week since the summer weather pattern is here, keeping the marine layer at bay.  I opened up the 20-inch but seeing was never good enough to support very close separations.  So I continued on with the Struve list, covering a few gaps in the spring list.

The night of the 10th I also used the 20-inch, but with the night vision device.  I ran through several globular clusters, hitting all of them.  Using NV in the back yard is like using the 20-inch in a dark sky -- I could do an observing program for globular clusters, easily.  Image scale remains a problem, as I'm at something like 55x.  But I could use the Challenger, say, to go after the very small and dim ones.

Solor observing almost daily, of course, with lots to see on the more active sun.

STF1768 AB: 203; 200x: Light orange A, split, >1 Dm.  SOC grade 3 orbit, 245 years, but there's -23% PRO, 102 AU WS, 2.3+1.5 Msol.  Borderline if binary.  

13h 37m 27.70s +36° 17' 41.4" P.A. 94.00 sep 1.7 mag 4.98,6.95 Sp A7III+A8V dist. 60.9 pc (198.66 l.y.)

STF1758 AB: 203; 140x: Light orange stars, slightly unequal, easy split.  -95% PRO, it is not binary.

13h 32m 51.51s +49° 08' 24.3" P.A. 290.00 sep 3.4 mag 8.70,8.95 Sp G0 dist. 77.04 pc (251.3 l.y.)

STF1607 AB: 203; 140x: Wide, 1 Dm.  -97% PRO, it is not binary.

12h 11m 33.63s +36° 05' 21.7" P.A. 29.00 sep 27.0 mag 8.89,9.83 Sp A3 dist. 188.68 pc (615.47 l.y.)

STF1609 AB: 203; 140x: Light orange B, seen with averted vision, wide.  No parallax data for the secondary.

12h 11m 41.76s +50° 50' 15.8" P.A. 205.00 sep 11.1 mag 7.98,9.55 Sp F2 dist. 184.84 pc (602.95 l.y.)

STF1610 AB: 203; 140x: Faint, wide, 2 Dm.  95% PRO, 3,543 AU WS, 1.5+0.9 Msol, but the RVD 2.1 > EV 1.1, it is not binary.

12h 11m 53.03s +38° 46' 03.8" P.A. 331.00 sep 29.5 mag 8.56,10.62 Sp G4V dist. 139.28 pc (454.33 l.y.)

STF1613 AB: 203; 200x: Faint, near equal, good close split.  10% PRO, 252 AU WS, 1.7+1.7 Msol, it is likely binary and needs an orbit.

12h 12m 34.01s +35° 45' 45.6" P.A. 7.00 sep 1.2 mag 9.29,9.36 Sp F5 dist. 200 pc (652.4 l.y.)

STF1622 AB: 203; 140x: Light orange stars, wide, 3 Dm.  -3% PRO, and the RVD 4.5 > EV 2.1, it is not binary.

12h 16m 07.55s +40° 39' 36.6" P.A. 260.00 sep 11.6 mag 5.86,8.71 Sp M1III+F7V dist. 236.41 pc (771.17 l.y.)

STF1815 AB: 203; 140x: Wide, 1 Dm white stars.  -89% PRO, it is not binary.

14h 12m 36.22s +45° 11' 52.5" P.A. 151.00 sep 9.0 mag 9.58,10.92 Sp K0 dist. 170.07 pc (554.77 l.y.)

STF1895 AB: 203; 140x: Unequal, wide, in a group of stars to form a triangle.  -15% PRO, 3,667 AU WS, 2.5+2.1 Msol, and the RVD 0.8 < EV 1.5.  There is some chance it is binary but not likely, can try an orbit.

14h 57m 27.87s +40° 09' 42.2" P.A. 42.00 sep 12.7 mag 8.27,8.88 Sp A9IV dist. 125.63 pc (409.81 l.y.)

STF1896 AB: 203; 140: Very nice pair, slightly unequal white stars, close separation with low power, and a plus 1 star (AC) very wide with a PA perpendicular to AB.  -32% PRO, it is not binary.

14h 58m 21.57s +44° 02' 35.9" P.A. 276.00 sep 4.1 mag 8.97,9.47 Sp F8 dist. 96.06 pc (313.35 l.y.)

STF1932 AB: 203; 200x: Excellent pair, slightly unequal white stars, with 140x better seen 200x.  90% PRO, only 60 AU WS, 1.1+1.1 Msol, it is certainly binary.  SOC grade 2 orbit, 196-year period, it will move W to NW and slightly tighten in the next could of decades.

15h 18m 20.19s +26° 50' 24.7" P.A. 267.70 sep 1.6 mag 7.32,7.41 Sp F6V+F6V dist. 35.98 pc (117.37 l.y.)

STF1936 AB: 203l 140x: Slightly unequal stars, very wide. -95% PRO, it is not binary.

15h 21m 07.63s +27° 02' 23.4" P.A. 231.00 sep 19.8 mag 9.92,10.09 Sp F2+K0

STF1941 AB: 203; 200x: Faint stars, suspected as double low power, very close split 200x, slightly unequal.  16% PRO, 222 AU WS, 1.4+1.3 Msol, it is possible to be binary, an orbit should be tried.

15h 25m 42.81s +26° 37' 40.5" P.A. 212.00 sep 1.4 mag 9.65,9.77 Sp F5 dist. 168.63 pc (550.07 l.y.)

STF1955 AB: 203; 140x: Faint, slightly unequal stars, well split.  61% PRO, 2,060 AU WS, 1.7+1.5 Msol, and the RVD 0.7 < EV 1.7, it is probably binary and needs an orbit.

15h 33m 51.28s +26° 42' 30.4" P.A. 237.00 sep 7.8 mag 9.84,10.32 Sp F8

STF1951 AB: 203; 140x: Bright white A, B flashes with averted vision and then can hold direct, wide.  -88% PRO, it is not binary.

15h 30m 20.35s +27° 39' 29.8" P.A. 294.00 sep 17.3 mag 7.89,11.88 Sp A0 dist. 531.91 pc (1735.09 l.y.)

STF1963 AB: 203; 140x: Near equal white stars, easy split.  -7% PRO, 435 AU WS, 1.3+1.2 Msol, and the RVD 0.3 < EV 3.2, it is not likely binary.

15h 37m 53.73s +30° 06' 10.4" P.A. 298.00 sep 5.2 mag 8.54,8.85 Sp F8 dist. 75.87 pc (247.49 l.y.)

STF1935 AB: 203; 140x: Near equal stars, well split.  30% PRO, 1,619 AU WS, 1.4+1.3 Msol, and the RVD 0.3 < EV 1.7, it is likely binary any needs an orbit.

15h 20m 13.27s +30° 41' 44.2" P.A. 289.00 sep 8.6 mag 9.91,10.19 Sp G5 dist. 86.66 pc (282.68 l.y.)

STF1988 AB: 203; 140: Near equal white stars, well split.  14% PRO, 159 AU WS, 1.6+1.5 Msol, it is possibly binary and needs an orbit.

15h 56m 45.53s +12° 28' 40.6" P.A. 249.00 sep 1.7 mag 7.59,7.84 Sp F1V dist. 96.25 pc (313.97 l.y.)

STF1919 AB: 203; 140x: Near equal white stars, very wide.  68% PRO, 760 AU WS, 1.2+1.0 Msol, and the RVD 0.8 < EV 2.3, it is certainly binary and needs an orbit.

15h 12m 43.48s +19° 17' 09.8" P.A. 11.00 sep 23.2 mag 6.71,7.38 Sp G1V+G5V dist. 27.24 pc (88.86 l.y.)

STF1917 AB: 203; 140x: Very close split, unequal stars.  -33% PRO, it is not binary.

15h 12m 33.29s +15° 22' 33.6" P.A. 232.00 sep 2.5 mag 9.84,9.91 Sp F8 dist. 107.76 pc (351.51 l.y.)

STF1923 AB: 203; 140x: 1 Dm, well split.  22% PRO, 645 AU WS, 1.5+1.1 Msol, it is possibly binary and needs an orbit.

15h 13m 47.15s +14° 26' 54.3" P.A. 12.00 sep 4.8 mag 9.07,10.14 Sp G0V dist. 150.6 pc (491.26 l.y.)

STF1924 AB: 203; 140x: Faint, 1 Dm, very wide.  -62% PRO, it is not binary.

15h 14m 06.54s +25° 45' 26.1" P.A. 306.00 sep 15.2 mag 9.71,10.88 Sp A7

STF1931 AB: 203; 140x: Bright light yellow stars, wide, half delta magnitude.  -32% PRO, it is not binary.

15h 18m 41.98s +10° 25' 39.7" P.A. 166.00 sep 13.4 mag 7.20,8.07 Sp F7V+G3V dist. 49.98 pc (163.03 l.y.)

STF1930 AB: 203; 140x: Wide, faint B, 4 Dm.  74% PRO, 289 AU WS, 1.6+0.5 Msol, but the RVD 3.9 > EV 3.6, it might not be binary, but an orbit should be tried.

15h 19m 18.79s +01° 45' 55.5" P.A. 36.00 sep 11.1 mag 5.06,10.11 Sp F8V dist. 25.38 pc (82.79 l.y.)

STF1943 AB: 203; 140x: Slightly unequal, well separated.  92% PRO, 450 AU WS, 1.1+1.0 Msol, it is likely binary and needs an orbit.

15h 27m 37.68s +05° 22' 06.2" P.A. 148.00 sep 5.1 mag 9.29,9.58 Sp G5

STF1945 BC: 203; 140x: BC are faint, equal, well separated, with a wide only slightly brighter A star in the same PA.  60% PRO, 901 AU WS, 0.9+0.9 Msol, and the RVD 0.0 < EV 1.9, it is most likely binary and needs an orbit.

15h 27m 59.19s +14° 42' 22.6" P.A. 281.00 sep 9.2 mag 10.62,10.62

STF1949 AB: 203; 140x: Equal, wide.  95% PRO, 3,369 AU WS, 1.4+1.3 Msol, and the RVD 0.2 < EV 1.2, it is likely binary and needs an orbit.

15h 30m 38.37s +13° 03' 23.1" P.A. 213.00 sep 16.5 mag 10.16,10.25 Sp G0+G0

STF1954 AB: 203; 140x: Lovely 1 Dm yellow-white stars, close but easily split with low power.  -75% PRO, it is not binary, though there is a SOC grade 4 orbit, it is likely in error.

15h 34m 48.14s +10° 32' 20.0" P.A. 171.50 sep 4.0 mag 4.17,5.16 Sp F0IV dist. 69.93 pc (228.11 l.y.)

STF1953 AB: 203; 140x: Unequal, wide.  14% PRO, 2,044 AU WS, 1.9+1.5 Msol, and the RVD 0.9 < EV 1.7, it is likely binary and needs an orbit.

15h 32m 57.15s +05° 30' 32.3" P.A. 253.00 sep 6.7 mag 9.65,10.58 Sp F5 dist. 641.03 pc (2091.04 l.y.)

STF1960 AB: 203l 140x: Unequal, wide.  68% PRO, 2,121 AU WS, 1.4+1.2 Msol, and the RVD 0.9 < EV 1.5, it is likely binary and needs an orbit.

15h 36m 35.97s +09° 14' 45.4" P.A. 320.00 sep 12.1 mag 9.96,10.52 Sp G5

STF1968 AB: 203; 140x: Slightly unequal, wide.  28% PRO, 1,314 AU WS, 1.1+0.9 Msol, and the RVD 0.7 < EV 1.6, it is likely binary and needs an orbit.

15h 45m 23.29s -01° 23' 29.3" P.A. 93.00 sep 14.4 mag 9.49,10.49 Sp G5V+K0

STF1974 AB: 203; 200x: Near equal, close split, best seen higher power.  24% PRO, 343 AU WS, 1.5+1.4 Msol, it is likely binary and needs an orbit.

15h 49m 11.99s -03° 14' 01.1" P.A. 159.00 sep 2.5 mag 8.95,9.12 Sp A0

STF1985 AB: 203; 140x: Light orange stars, 1 Dm, wide.  27% PRO, 231 AU WS, 1.2+0.9 Msol, it is probably binary, and there is a grade 5 SOC orbit, 2307-year period.

15h 55m 54.63s -02° 09' 51.3" P.A. 355.00 sep 6.0 mag 7.03,8.65 Sp F8V dist. 36.9 pc (120.37 l.y.)

STF1987 AB: 203; 140x: Unequal, wide.  -18% PRO, it is not likely binary.

15h 57m 14.92s +03° 24' 19.2" P.A. 320.00 sep 10.4 mag 7.31,8.71 Sp A0V+B6V dist. 179.21 pc (584.58 l.y.)

STF1993 AB: 203; 140x: 2 Dm, very wide.  -97% PRO, it is not binary.  =STF1994

15h 59m 46.92s +17° 22' 34.7" P.A. 43.00 sep 20.1 mag 8.59,8.88 Sp A0

STF1990 BC: 203; 140x: Wide near equal AB, and B has a near equal pair close companion.  All easy splits with low power.  -14% PRO, it is not binary.

15h 58m 56.87s +21° 47' 54.8" P.A. 26.00 sep 4.0 mag 9.25,9.29 Sp A2 dist. 162.34 pc (529.55 l.y.)

STF1986 AB: 203; 140x: Unequal very wide.  -19% PRO, it is not binary.

15h 55m 29.92s +10° 06' 17.4" P.A. 93.00 sep 14.7 mag 8.86,9.85 Sp F0 dist. 645.16 pc (2104.51 l.y.)

STF1978 AB: 203; 140x: Near equal, wide.  75% PRO, 2,217 AU WS, 1.4+1.2 Msol, it is likely binary and needs an orbit.

15h 50m 55.23s +14° 40' 42.9" P.A. 233.00 sep 14.8 mag 9.19,10.13 Sp G0 dist. 3333.33 pc (10873.32 l.y.)

STF1970 AB: 203; 140x: Very bright A and faint wide B.  15% PRO, 1,424 AU WS, 2.8+0.7 Msol, it is possibly binary and needs an orbit. 

15h 46m 11.21s +15° 25' 18.9" P.A. 263.00 sep 29.9 mag 3.66,9.96 Sp A2IV dist. 47.55 pc (155.11 l.y.)

STF1942 AB: 203; 140x: Near equal wide.  81% PRO, 2,177 AU WS, 1.7+1.2 Msol, and the RVD 1.1 < EV 1.6, it is likely binary and needs an orbit.

15h 26m 03.11s +21° 27' 35.7" P.A. 91.00 sep 9.7 mag 9.49,10.68 Sp G5 dist. 584.8 pc (1907.62 l.y.)

STF1979 AB: 203; 140x: Equal, wide.  26% PRO, 2,677 AU WS, 1.9+1.6 Msol, and the RVD 0.7 < EV 1.5, it is likely binary and needs an orbit.

15h 50m 39.10s +22° 28' 35.2" P.A. 246.00 sep 9.3 mag 9.58,10.14 Sp F5 dist. 135.32 pc (441.41 l.y.)

STF1977 AB: 203; 140x: Faint, equal, wide.  2% PRO, 1,672 AU WS, 1.5+1.0 Msol, but the RVD 1.9 > EV 1.6, it likely is not binary.

15h 49m 32.92s +25° 27' 36.7" P.A. 356.00 sep 13.9 mag 8.76,10.95 Sp G0IV dist. 200.4 pc (653.7 l.y.)

STF1981 AB: 203; 140x: Faint, wide, unequal.  20% PRO, 2,296 AU WS, 1.6+1.1 Msol, but the RVD 1.6 is slightly higher than the EV 1.4, it is possibly binary and needs an orbit.

15h 51m 16.00s +25° 08' 39.2" P.A. 4.00 sep 12.1 mag 9.37,10.86 Sp G0

STF1950 AB: 203; 200x: Unequal, close, needed higher power to resolve.  71% PRO, 1,758 AU WS, 4.1+2.9 Msol, RVD 1.7 < EV 2.7, it is likely binary and needs an orbit.

15h 29m 58.46s +25° 30' 31.1" P.A. 91.00 sep 3.3 mag 8.07,9.23 Sp K4III dist. 485.44 pc (1583.51 l.y.)

14 july 2023, obscure stuff

I went out to an observing site along the central coast on Friday.  It was the one day this new moon when I could get out and which had good sky conditions forecasted, if hot.  I left at 2:00pm thinking to avoid most of the traffic, but various accidents and the sheer volume of cars slowed things down.  I didn't mind quite so much, since at least I could remain in air conditioning on the way down.  It was 100-degrees F at the site when I arrived.

I sat in the shade of Mark W.'s car and we chatted as I ate my dinner.  Once the sun set I started to set-up: 4-inch refractor paired with a C8 on an alt/az mount.  It was the first time using the C8 and I spent around 15 minutes getting the collimation done, and felt it was pretty good but probably not perfect.  I also brought my mirror mount.  Transparency was hurt by some wildfire smoke which came over just at dusk.  SQML read 21.4 at midnight.  I observed until 3am before packing in and getting a couple hours sleep until morning.  

With Scorpio high in the sky, I spent the about half an hour observing Sivan 8, a large circular structure at the western curve of the bottom of Scorpio's tail.  It contains RCW 113 (=Gum 55), which GalaxyMap describes as "a huge region of diffuse nebulosity surrounding the Sco OB1 association and its core ionising cluster, NGC 6231".  RCW are Alex Rodgers, Colin Campbell, and John Whiteoak, who, working at Australia's Mount Stromlo observatory under the direction of Dutch-American astronomer Bart Bok, published a catalog of 182 nebula in the southern skies in 1960.  They used a Meinel-Pearson 8-inch f/1 flat-field Schmidt with various filters, including Ha.  RCW 113 is described in the catalog as a "Large loop of ionization in region of fainter emission."  Gum says it is "A large roughly semicircular loop, whose ragged appearance is due in part to overlying obscuration. At its centre is the galactic cluster NGC 6231, which is the nucleus of an O-Association".  I used the Sivan and RCW boundary descriptions to indicate the extent of the nebula delineated by their designations.

I have been engrossed with this area since observing the Sivan nebula this last fall and spring.  Astrophotos show the giant circular structure but also a couple dark, Elephant Trunk-like cometary nebula, particularly one cataloged as SFO 82 (nicknamed "The Dark Tower of Scorpius"), along with several Horsehead-like dark nebula intrusions into the brighter wispy nebula.  Using my 4-inch with PVS-14 and 3nm Ha, SFO 82 was seen faintly as a cone-shaped dark nebula with bright nebular sides; the 3nm Ha filter cut the brightness of the star at its tip quite a lot.  The elephant trunk extends approximately 30' to the WNW into the surrounding nebula.  The paper I referenced above indicates SFO 82 is part of Sco OB1 and that the trunk is likely being shaped by radiation and gas pressure interactions with NGC 6231.  When observing this area with Mark W., I pointed out the two wedge-shaped dark nebula along the southern rim, in line with the star chain formed from IC 4628 through NGC 6231.  The 4-inch gives a 5° TFOV, so some panning of the scope is needed to take in all of Sivan 8, which is 7°x7°.  

Image from the SuperCMOS explorer via GalaxyMap, with my annotations of the designation diameters according to the dimensions given in the respective discovery papers.

Panning the telescope 9° to the southwest we arrive at the center of RCW 114, a very large, wispy nebulous area.  GalaxyMap says "This huge but very faint nebula is probably a ring nebula surrounding the Wolf-Rayet star WR 90, expanding into a pre-existing cavity created by the supernova remnant SNR 343.0-06.0."  Distance estimated at 1500pc, so it might not be related to Sivan 8 / RCW 113, which has distance estimates between 1640-2000pc, even though the wisps between the two regions appear to connect them.  Called the "Dragon's Heart" nebula by astrophotographers, it appeared as a giant "C" filling a 5°x5° area, with the brightest thin wisps to the east and south, and much fainter nebula filling in the open part of the "C."  Here it is in relation to Sivan 8:

I panned around the sky a bit aimlessly after that.  I tried viewing with the PVS attached to a 3x lens using the mirror mount, but the filters placed in between the PVS and the lens are very vignetted, with the outer ~20% dark.  The view is too distracting and I think I prefer the 60mm f/6 refractor's view better, even if it is a smaller FOV.

I then tried out the C8.  Fortunately, it came to focus even with the filter wheel, so I could, with some awkwardness, move the NV stack to this scope, but would need to rebalance the whole.  And to my surprise, the view was not grainy as I feared, given the long focal length.  I proceeded to observe a series of globular clusters in the central Milky Way, and also dark nebula, all of which reminded me of what I could see with my 20-inch in a dark sky.  The FOV is a little more than 1°, which is big enough the object doesn't move too fast out of the FOV (though a tracking mount would be better).  I can see the 4-inch refractor and the C8 as a "lightweight" portable set-up, for times when I need something smaller, rather than the Ayers scope which is heavy and awkward.  I think the Ayers scope is more versatile (no swapping of stacks), but I have yet to test how it looks barlowed.  In any case, it was pleasantly surprised with the C8.

I decided to see what the C8 could do with some smaller, fainter nebula, so I pulled out Vogel's "Large Planetary Nebula" Observing guide.  These are "large" in the context of viewing with his 22-inch telescope, with a similar 1° FOV.  I had some very good results with my smaller scope:

Yerkes McDonald 16: =PN G038.7+01.9, 18 54 57.30 +06 02 31.1.  At 30x with the C8 with a dual band Ha+OIII filter, I saw a very faint, weak, small oval sky brightness change off the base of a distinctive "L" shaped asterism, somewhat brighter on the eastern side, but no defined edge and no detail within the oval.  The nebula is roughly 5'x3' with PA NE-SW.  Vogel was unsuccessful visually with 22-inch scope, 7mm exit pupil, and H-beta filter.  Kent Wallace was also unsuccessful visually with 20-inch, but he notes Jack Marling had the first known visual observation sometime in 1990 (with an 18-inch?).  DSS Image:

Capellaro-Turatto-Salvadori-Sabbadin (CTSS) 3: =Sh2-78.  19h 03 08 +14 06 57. 11'x9' PA NE-SW.  Extremely vague oval nebulosity in between two near equal magnitude stars, with dual band filter only.  Vogel reports "extremely faint" with 22-inch.  

IPHASX J205013.7+465518: 20 50 05 +46 52 48. 6' diameter.  Brighter knot in and irregular, curved glow orientated N-S, with mottling in the glow and a brighter southeastern rim.  Seen only careful matching of the star field with the finder chart.  Vogel successful with 22-inch 100x and OIII.  INT/WFC Photometric H-alpha Survey extended sources.  

Abell 74: PK 72-17.1 2 21:16.9 +24 09 15.8 871, 791': Extremely weak, subtly mottled round glow, soft edges.  C8 & dual band.  Wallace unsuccessful with 20-inch, Vogel successful with 7mm exit pupil and UHC, "large and extremely faint glow. Some parts of the edge were well defined."  

Motch-Werner-Pakull (MWP) 1: 21h 17 07 +34 12 40, 13'x9': Very small, very faint, curved glow, lying at the center of a trapezium asterism which guided me to the correct location in the field.  Vogel successful with 22-inch, " 200x with OIII, an extremely faint, very diffuse and oval patch could be observed at the location that appears brightest on the blue POSS. Other OIII emission regions in the E and W lobes are somewhat fainter."

Transparency on the below average side and turning worse through the night, with haze slowly thickening.  Seeing only average.  But still a good night with the six-inch going after Struves in Hercules, and there are many.  Observed from 10pm-11:30pm.

STF2084 AB: 152; 250x: Zeta Her.  Very pretty pair, large delta magnitude, B visible on A's diffraction ring.  SOC grade 1 orbit 34.46-years, it is due east now and will slowly tighten to the north by 2035.

16h 41m 17.16s +31° 36' 09.8" P.A. 100.00 sep 1.5 mag 2.95,5.40 Sp G1IV dist. 10.72 pc (34.97 l.y.)

STF2001 AB: 152; 125x: Faint 1 Dm pair, well separated.  90% PRO, 2,325 AU WS, and the RVD 1.0 < EV 1.4, so it is likely binary and needs an orbit.  

16h 01m 13.23s +41° 50' 01.7" P.A. 168.00 sep 11.6 mag 10.01,10.98 Sp G

STF2010 AB: 152; 125x: Marfik.  Light orange stars, wide, >1 Dm.  Also nicely seen with 60mm at 40x.  -40% PRO, it is not binary.

16h 08m 04.55s +17° 02' 49.2" P.A. 14.00 sep 26.8 mag 5.10,6.21 Sp G7III+K0I dist. 112.74 pc (367.76 l.y.)

STF2025 AB: 152; 200x: Wonderfully fine pair, nearly 2 Dm, very closely separated.  0% PRO, but only 386 AU WS, 1.9+1.1 Msol, and the RVD 2.3 < EV 3.7, so it might be binary and needs an orbit.

16h 11m 11.71s +47° 33' 36.1" P.A. 164.00 sep 2.6 mag 8.03,9.75 Sp F0 dist. 141.64 pc (462.03 l.y.)

STF2024 AB: 152; 125x: Light orange A, wide 3 Dm B.  25% PRO, 5,377 AU WS, 4.3+1.2 Msol, but RVD 5.9 > EV 1.4, it is not binary.

16h 11m 47.60s +42° 22' 28.2" P.A. 44.00 sep 23.6 mag 5.86,10.73 Sp K4III dist. 193.8 pc (632.18 l.y.)

STF2030 AB: 152; 125x: Faint B just seen directly, well separated.  27% PRO, 1,088 AU WS, 2.2+1.2 Msol, so it might be binary and needs an orbit.

16h 12m 43.21s +40° 46' 54.1" P.A. 239.00 sep 5.7 mag 7.91,10.16 Sp A0 dist. 139.47 pc (454.95 l.y.)

STF2021 AB: 152; 125x: Equal close stars nicely split with low power.  Also seen hairline split in the 60mm at 40x.  22% PRO, 101 AU WS, 0.9+0.9 Msol, and the RVD 0.1 < EV 5.6, it is likely binary.  SOC grade 4 orbit 949-year period.  

16h 13m 18.45s +13° 31' 37.2" P.A. 358.40 sep 4.0 mag 7.43,7.48 Sp G9V dist. 23.58 pc (76.92 l.y.)

STF2023 AB: 152; 200x: Nice close split, 1 Dm.  18% PRO, 216 AU WS, 1.4+1.2 Msol, and the RVD 0.7 < EV 4.7, so it is likely binary and needs an orbit. 

16h 14m 30.89s +05° 31' 21.0" P.A. 222.00 sep 1.8 mag 8.70,9.38 Sp F5

STF2027 AB: 152; 125x: Fine split, near equal.  22% PRO, 373 AU WS, 1.8+1.8 Msol, but the RVD 8.2 > EV 4.1, it is not binary.

16h 15m 16.64s +04° 15' 46.6" P.A. 81.00 sep 1.9 mag 8.77,8.86 Sp F0 dist. 271 pc (884 l.y.)

STF2026 AB: 152; 125x: Nice near equal pair, split with 125x, better seen 200x.  34% PRO, only 89 AU WS, 0.6+0.6 Msol, it is likely binary.  An interesting low mass pair, 3x the AU from us to Neptune, SOC grade 3 orbit, 433-year period.

16h 15m 57.07s +07° 21' 24.8" P.A. 15.90 sep 3.6 mag 9.48,9.86 Sp K5 dist. 26.04 pc (84.94 l.y.)

STF2035 AB: 152; 200x: Needed higher power and averted vision to see faint & close B.  19% PRO, 711 AU WS, 1.8+1.4 Msol, and the RVD 1.1 < EV 2.8, it is likely binary and needs an orbit.

16h 18m 09.39s +25° 51' 41.2" P.A. 36.00 sep 2.7 mag 9.71,10.90 Sp F5

STF2037 AB: 152; 250x: Split with high power and with seeing only.  Surprisingly, -62% PRO, it is not binary.

16h 18m 49.03s +17° 23' 58.3" P.A. 256.00 sep 1.1 mag 9.82,9.86 Sp G5 dist. 167.5 pc (546.38 l.y.)

STF2039 AB, 152; 125x: B suspected with averted vision only, wide.  -92% PRO, it is not binary.

16h 22m 17.14s +24° 44' 31.6" P.A. 344.00 sep 11.6 mag 8.80,12.23 Sp F8V dist. 129.53 pc (422.53 l.y.)

STF2040 AB: 152; 125x: B is fairly close separation, seen with averted vision only.  62% PRO, 1,201 AU WS, 2.0+1.2 Msol, and the RVD 2.0 < EV 2.2, so there is a possibility it is binary and needs an orbit.

16h 23m 05.73s +13° 50' 23.3" P.A. 313.00 sep 7.0 mag 8.11,10.14 Sp F2 dist. 195.69 pc (638.34 l.y.)

STF2047 AB: 152; 125x: Lovely near equal white pair, closely separated.  10% PRO, 250 AU WS, 1.6+1.6 Msol, it is likely binary and needs an orbit tried.

16h 23m 08.85s +47° 37' 48.4" P.A. 325.00 sep 1.8 mag 8.54,8.65 Sp F8 dist. 185.53 pc (605.2 l.y.)

STF2043 AB: 152; 125x: Wide faint B seen with averted vision only.  -16% PRO, it is not binary.

16h 25m 26.90s +17° 18' 10.6" P.A. 85.00 sep 10.0 mag 8.03,11.44 Sp G0 dist. 107.07 pc (349.26 l.y.)

STF2042 AB: 152; 125x: B needs averted vision to see, wide separation.  -94% PRO, it is not binary.

16h 25m 50.78s +05° 42' 07.1" P.A. 134.00 sep 9.7 mag 8.59,11.40 Sp F0 dist. 180.83 pc (589.87 l.y.)

STF2049 AB: 152; 250x: Very fine close split pair, around 2 Dm.  -33% PRO, it is not binary.

16h 27m 54.63s +25° 59' 03.4" P.A. 195.00 sep 1.1 mag 7.33,8.10 Sp A2.5V dist. 132.8 pc (433.19 l.y.)

STF2053 AB: 152; 125x: Faint pair, slightly unequal, wide.  No Gaia parallax data for the secondary.

16h 28m 21.06s +31° 08' 08.9" P.A. 351.00 sep 21.6 mag 9.95,10.84 Sp G0

STF2157 AB-C: 152; 125x: Close pair, >1 Dm.   -10% PRO, it is not binary.

17h 22m 52.73s +16° 27' 40.9" P.A. 208.00 sep 3.4 mag 8.92,10.17 Sp G5 dist. 118.62 pc (386.94 l.y.)

STF2163 AB: 152; 250x: With seeing and high power, close faint pair, B barely resolved, very difficult with this aperture in not good conditions.  90% PRO, 223 AU WS, 1.1+1.2 Msol, it is likely binary and needs an orbit.

17h 23m 21.04s +42° 09' 03.2" P.A. 76.00 sep 1.4 mag 10.25,10.49 Sp F8

STF2161 AB: 152; 125x: Rho Her. Excellent close bright pair, well split with 125x.  Also hairline split in the 60mm at 40x.  -41% PRO, it is not binary.

17h 23m 40.97s +37° 08' 45.3" P.A. 321.00 sep 4.1 mag 4.50,5.40 Sp B9.5III dist. 120.63 pc (393.5 l.y.)

STF2164 AB: 152; 125x: 1 Dm, well split.  22% PRO, 775 AU WS, 1.4+1.0 Msol, and the RVD 1.4 < EV 2.3, it is likely binary and needs an orbit.

17h 23m 44.61s +47° 16' 14.3" P.A. 13.00 sep 9.3 mag 8.16,9.81 Sp F8 dist. 84.82 pc (276.68 l.y.)

STF2162 AB: 152; 250x: Hairline split, slightly unequal.  -16% PRO, it is not likely binary.

17h 23m 54.55s +36° 27' 28.0" P.A. 285.00 sep 1.3 mag 9.39,9.57 Sp A2 dist. 369 pc (1203.68 l.y.)

STF2167 AB: 152; 125x: 2 Dm, wide.  -89% PRO, it is not binary.

17h 24m 23.98s +49° 31' 28.3" P.A. 207.00 sep 21.0 mag 8.12,10.67 Sp F5 dist. 1190.48 pc (3883.35 l.y.)

STF2160 AB: 152; 250x: 2 Dm, nice split, best seen with higher powers.  59% PRO, 653 AU WS, 2.9+1.4 Msol, it is likely binary and needs an orbit.

17h 24m 33.80s +15° 36' 21.7" P.A. 66.00 sep 3.9 mag 6.40,9.28 Sp B9V dist. 153.37 pc (500.29 l.y.)

STF2165 AB: 152; 125x: Wide, 1 Dm, white A and blue B.  -91% PRO, it is not binary.

17h 26m 13.76s +29° 27' 20.4" P.A. 62.00 sep 10.4 mag 7.74,9.55 Sp Am dist. 231.48 pc (755.09 l.y.)

STF2168 AB: 152; 125x: Fine 1 Dm.  59% PRO, 764 AU WS, 2.2+2.5 Msol, it is likely binary and needs an orbit.

17h 26m 40.46s +35° 45' 55.3" P.A. 203.00 sep 2.3 mag 8.80,9.08 Sp F5 dist. 675.68 pc (2204.07 l.y.)

STF2177 AB: 152; 175x: Fine faint, very close pair, nearly 1 Dm. 80% PRO, 879 AU WS, 1.8+1.3 Msol, RVD 1.2 < EV 2.5, so it is likely binary and needs an orbit.

17h 27m 48.32s +46° 25' 16.4" P.A. 133.00 sep 3.6 mag 9.20,10.70 Sp F0

STF2174 AB: 152; 125x: Well split, nearly 1 Dm, faint, B needs averted vision.  -22% PRO, it is not binary.

17h 29m 25.08s +32° 45' 51.8" P.A. 331.00 sep 5.4 mag 11.13,12.40

STF2175 AB: 152; 125x: In same field with STF2174, a brighter pair, wider, nearly 2 Dm.  100% PRO, 3,460 AU WS, 2.1+1.4 Msol, the RVD 1.7 > EV 1.3, it is not likely to be binary.

17h 29m 26.85s +32° 42' 33.8" P.A. 9.00 sep 13.3 mag 8.79,10.64 Sp F3+F7 dist. 131.58 pc (429.21 l.y.)

STF2178 AB: 152; 175x: Light orange stars, nearly 2 Dm, closely split.  Also seen with 60mm at 40x, B barely seen with direct vision.  64% PRO, 1,421 AU WS, 2.3+1.2 Msol, but the RVD 2.6 > EV 2.1, it is not likely binary.

17h 29m 28.15s +34° 56' 19.0" P.A. 129.00 sep 10.6 mag 7.29,9.05 Sp K0 dist. 128.53 pc (419.26 l.y.)

STF2181 AB: 152; 125x: Both B and C are very faint and flash into view with averted vision at the same time at the opposite sides of brighter white A.  Very interesting effect!  B can then be held with direct vision, but C remains averted vision only.  There is no overlap of the parallax ranges, none of them are binary.

17h 31m 42.54s +30° 19' 05.3" P.A. 328.00 sep 33.0 mag 7.04,10.54 Sp K0 dist. 86.81 pc (283.17 l.y.)

STF2182 AB: 152; 125x: Nearly 1 Dm, well split.  8% PRO, 1,021 AU WS, 1.7+1.4 Msol, it is likely binary and needs an orbit.

17h 32m 27.74s +23° 52' 04.3" P.A. 1.00 sep 5.3 mag 9.06,9.96 Sp G0

STF2189 AB: 152; 125x: B appears with averted vision only, wide.  -25% PRO, it is not binary.

17h 32m 49.72s +47° 53' 19.2" P.A. 99.00 sep 21.2 mag 7.83,11.24 Sp A2V dist. 213.22 pc (695.52 l.y.)

STF2190 AB: 152; 125x: 2 Dm, wide.  -59% PRO, it is not binary.

17h 35m 59.56s +20° 59' 46.6" P.A. 22.00 sep 10.4 mag 6.13,9.48 Sp A7IV dist. 112.87 pc (368.18 l.y.)

STF2192 AB: 152; 125x: Wide, white, 1 Dm. -91% PRO, it is not binary.

17h 40m 03.84s +29° 14' 12.7" P.A. 32.00 sep 15.9 mag 7.82,10.49 Sp K0III dist. 142.65 pc (465.32 l.y.)

STF2194 AB: 152; 125x: Wide, 2 Dm, light yellow stars.  45% PRO, 3,044 AU WS, 3.3+1.5 Msol, it might be binary and needs an orbit.

17h 41m 05.50s +24° 30' 47.2" P.A. 8.00 sep 16.5 mag 6.51,9.28 Sp K1III+F0V dist. 161.81 pc (527.82 l.y.)

STF2195 AB: 152; 125x: Faint B seen with averted vision only, wide.  -97% PRO, it is not binary.

17h 41m 27.04s +21° 10' 27.0" P.A. 286.00 sep 21.6 mag 11.68,11.75

STF2197 AB: 152; 125x: Faint pair, both stars brighten with averted vision, separated.  -18% PRO, it is not binary.

17h 41m 49.76s +21° 25' 54.7" P.A. 357.00 sep 7.9 mag 10.64,10.99 Sp K0

STF2210 AB: 152; 175x: Faint, 2 Dm very close B seen best with higher power.  75% PRO, 1,206 AU WS, 2.6+1.7 Msol, so it might be binary and needs an orbit.

17h 42m 11.03s +49° 00' 09.3" P.A. 122.00 sep 3.3 mag 8.93,10.63 Sp K0 dist. 337.84 pc (1102.03 l.y.)

STF2198 AB: 152; 125x: Closely separated B seen with averted vision only.  18% PRO, 1,815 AU WS, 2.8+1.1 Msol, but the RVD 4.1 > EV 2.0, it is not binary.

17h 42m 38.37s +26° 33' 06.1" P.A. 25.00 sep 7.7 mag 7.63,11.22 Sp K0III dist. 176.68 pc (576.33 l.y.)

STF2209 AB: 152; 125x: Wide, 1 Dm.  57% PRO, 4,125 AU WS, 1.7+0.9 Msol, but the RVD 2.2 > EV 1.1, it is not binary.

17h 42m 48.66s +43° 10' 08.4" P.A. 127.00 sep 29.8 mag 8.35,10.52 Sp F0 dist. 150.15 pc (489.79 l.y.)

STF2214 AB: 152; 125x: Wide near equal stars.  -43% PRO, it is not binary.

17h 43m 20.82s +43° 44' 52.6" P.A. 212.00 sep 19.7 mag 9.61,10.15 Sp G0