5 may 2025

A nice night out with the 6-inch, in spite of thin wispy clouds and average seeing.  I had a limited number of doubles to observe on the CDSA list, so I switched to my "Green Star" list and to a list of red stars -- many of which might have spectra on the red-end, but which appeared mostly off-white, with a couple of exceptions.  Now that we're moving toward summer, there should be many more nights of fine viewing ahead.

IQ UMa = 83 UMa: 152; 125x: Light orange, bright.  Wikipedia: "The visible component is an evolved red giant with a stellar classification of M2 III. It is a marginal barium star, showing an enhanced abundance of s-process elements in its outer atmosphere. This material may have been acquired during a previous mass transfer from a now white dwarf companion, or self-enriched by a dredge-up during the asymptotic giant branch process."

BGH  50 AB: 152; 125x: Superwide, 2 Dm.  2% PRO, 4,276 AU WS, 1.3+0.9 Msol, but RVD 1.6 > EV 1.0, it is not binary. 

14h 04m 45.95s +25° 49' 03.9" P.A. 32.00 sep 97.0 mag 7.00,8.90 Sp F5+K0 dist. 44.01 pc (143.56 l.y.)

BU  115 AB: 152; 180x: Very closely split, very much fainter B.  -55% PRO, it is not binary (in spite of SOC grade 5 orbit)>

13h 45m 20.87s +09° 03' 28.6" P.A. 259.00 sep 1.6 mag 7.53,10.40 Sp G5 dist. 54.67 pc (178.33 l.y.)

BU  341 AB: 152; 380x: Notched elongation with one weak end, unequal.  No Gaia parallax data.  SOC grade 3 orbit, 59-year period, it is at apastron now, and should close rapidly in the next few years.

13h 03m 46.09s -20° 35' 00.3" P.A. 130.00 sep 0.2 mag 6.25,6.51 Sp F8V dist. 28.21 pc (92.02 l.y.)

BU  413 = W Hya AB: 152; 125x: Noticeably red, also seen with 60mm finder.  M8e (red).  No Gaia data, but a previously recorded linear solution.

13h 49m 02.00s -28° 22' 03.5" P.A. 106.00 sep 66.8 mag 7.79,9.59 Sp M8e dist. 104.28 pc (340.16 l.y.)

This with the 20-inch 5/8:

BU  802 AB: 508; 200x: White A and much fainter B, well separated but looks like an artist's depiction of a planet.  15% PRO, 383 AU WS, 1.7+0.8 Msol, and RVD 2.9 < EV 3.4, it is possibly binary an needs an orbit.

13h 48m 36.15s +48° 21' 23.6" P.A. 227.00 sep 3.2 mag 7.56,11.78 Sp A8IV dist. 117.23 pc (382.4 l.y.)

BU  921 A-BC: 152; 125x: Nothing remarkable, white A and wide faint B.  BC is 11th mag 0.2 and likely why it was pulled up as binary.  No gaia data for B. 

12h 17m 55.52s -24° 00' 48.2" P.A. 221.00 sep 3.4 mag 7.01,10.67 Sp A0V dist. 141.04 pc (460.07 l.y.)

BU  935 AB: 152; 250x:  Component of STF 1780.  AB is a difficult 3 Dm 1" separated pair, no Gaia data.

13h 45m 56.33s -12° 25' 35.6" P.A. 304.00 sep 1.0 mag 5.66,8.47 Sp G8III dist. 124.69 pc (406.74 l.y.)

CY CVn: 152; 125x: Subtle orange tinge, not strong. Spectral M8 D ~.

ER Vir: 152; 125x: Very subtle off-white to pink tinge. Spectral M4III C

EV Vir: 152; 125x: Very light yellow. M4-M4.5II-III B

HD 119173: 152; 125x: Faint, very subtle red.  G0V C

HD 120248: 152; 125x: White. G3V C

HD 124292: 152; 125x: Off-white G8/K0V D

HD 126328: 152; 125x: Off-white K2 E

HR 5334: 152; 125x: Very light yellow M2III D

HU  740 AB: 152; 125x: Wide B very faint, seen with foveal coaxing only.  25% PRO, 754 AU WS, 2.5+1.0 Msol, it is possibly binary and needs an orbit.

13h 19m 44.11s -11° 40' 22.7" P.A. 273.00 sep 4.1 mag 7.31,11.35 Sp A2 dist. 245.1 pc (799.52 l.y.)

STF1724 AB: 152; 125x: Bright white yellow A, much fainter well split B.  MCA Aa-Ab is the prize, 0.4", need to reobserve.  AB -50% PRO, it is not binary.

13h 09m 57.01s -05° 32' 20.1" P.A. 342.00 sep 7.0 mag 4.40,9.39 Sp A0IV dist. 96.81 pc (315.79 l.y.)

STF1752 AB: 152; 250x: B with seeing, very much fainter on inside edge of white A's diffraction ring.  No gaia data for A

13h 28m 49.82s +59° 55' 41.7" P.A. 107.00 sep 1.0 mag 8.19,9.90 Sp F8 dist. 73.42 pc (239.5 l.y.)

STF1788 AB: 152; 125x: Well separated, unequal.  63% PRO, 126 AU WS, 1.1+1.3 Msol, RVD 0.6 < EV 5.7, it is likely binary and needs an orbit.

13h 54m 58.20s -08° 03' 31.9" P.A. 100.00 sep 3.7 mag 6.68,7.26 Sp F8V+G0 dist. 33.08 pc (107.91 l.y.)

STF1802 AB: 152; 200x: 1 Dm, well split. -93% PRO, it is not binary.

14h 08m 04.10s -12° 55' 42.1" P.A. 276.00 sep 6.0 mag 8.05,9.02 Sp G8/K0V: dist. 62.89 pc (205.15 l.y.)

STF1821 AB: 152; 125x: Bright A has a very light green tinge, wide 2 Dm B.  No parallax data for B.  SOC grade 5 orbit, >10,000-year period

14h 13m 29.00s +51° 47' 23.8" P.A. 236.00 sep 13.8 mag 4.53,6.62 Sp A7V+F1V dist. 50.1 pc (163.43 l.y.)

STF1846 AB: 152; 180x: Very bright orange A with much fainter, fairly close split B. -42% PRO, it is not binary.

14h 28m 12.22s -02° 13' 40.6" P.A. 111.00 sep 5.2 mag 4.92,10.02 Sp G2III dist. 36.26 pc (118.28 l.y.)

STF1965 AB: 152; 125x: A is pale white with a very subtle green tinge, wide 1 Dm B.  81% PRO, 987 AU WS, 3.8+3.0, it is possibly binary and needs an orbit.

15h 39m 22.68s +36° 38' 09.0" P.A. 306.00 sep 6.4 mag 4.96,5.91 Sp B7V+B9V dist. 145.14 pc (473.45 l.y.)

STT 279 AB: 152; 250x: Split with low power but better seen higher powers, very light orange stars, 4 Dm, close split.  -58% PRO, it is not binary.

14h 13m 49.46s +11° 59' 51.9" P.A. 257.00 sep 2.2 mag 6.84,9.13 Sp K2III dist. 170.94 pc (557.61 l.y.)

STT 299 AB: 152; 250x: Don't see green color, 1 Dm faint pair, fairly closely split.  23% PRO, 547 AU WS, 2.3+1.3 Msol, it might be binary and needs an orbit.

15h 33m 51.06s +63° 54' 25.7" P.A. 24.00 sep 3.3 mag 7.50,9.89 Sp A6V+KIII dist. 138.7 pc (452.44 l.y.)

13 april 2025

Used the 20-inch, just to exercise it since it's been a while since I observed with it. The seeing was average to poor, so I masked to 7-inches throughout.  A short session, just a couple of hours before needing to turn in.

H 4  47 AB: 178; 140x: Light yellow stars, very wide faint B. 100% PRO (1.7% error), 3,532 AU WS, 3.3+0.9 Msol, but RVD 5.7 > EV 1.4, it is not binary.

09h 28m 29.19s +08° 11' 18.1" P.A. 80.00 sep 25.2 mag 5.76,11.12 Sp G9III dist. 124.22 pc (405.21 l.y.)

H 5  58 AB: 178; 140x: Bright A and wide 3 Dm B. -73% PRO, it is not binary.

09h 35m 52.88s +14° 22' 46.5" P.A. 90.00 sep 41.0 mag 6.31,9.39 Sp A1V dist. 209.64 pc (683.85 l.y.)

HO  346 AB: 178; 280x: 4 Dm wide B seen with averted vision.  -17% PRO, it is not binary.

07h 25m 54.13s +18° 08' 51.0" P.A. 59.00 sep 13.2 mag 7.04,11.70 Sp G5 dist. 324.68 pc (1059.11 l.y.)

SHJ 107 AB: 178; 140x: Light orange A, very wide 3 Dm B.  -65% PRO, it is not binary.

09h 31m 57.58s +09° 42' 56.8" P.A. 77.00 sep 37.1 mag 5.22,9.30 Sp K3III dist. 153.14 pc (499.54 l.y.)

SMA  75 AB: 178; 140x: Very wide 2 Dm.  -23% PRO, it is not binary.

10h 43m 32.89s +46° 12' 13.9" P.A. 88.00 sep 288.0 mag 5.21,7.35 Sp F5III dist. 37.09 pc (120.99 l.y.)

STF1172 AB: 178; 200x: Closely split with seeing, 2 Dm. -43% PRO, it is not binary.

08h 04m 36.98s +54° 44' 46.0" P.A. 244.00 sep 1.7 mag 7.90,9.55 Sp A0IV dist. 386.1 pc (1259.46 l.y.)

STF1217 AB: 178; 140x: Wide 1 Dm. 61% PRO, 1,076 AU WS, 1.0+0.7 Msol, and RVD 1.2 < EV 1.7, it is possibly binary and needs an orbit.

08h 24m 15.65s +44° 56' 59.0" P.A. 242.00 sep 29.1 mag 7.79,9.39 Sp G2V+K2V dist. 37.75 pc (123.14 l.y.)

STF1258 AB: 178; 140x: Wide, white, near equal stars. -16% PRO, it is not binary.

08h 43m 25.41s +48° 51' 41.9" P.A. 331.00 sep 10.1 mag 7.72,7.87 Sp F0 dist. 143.47 pc (468 l.y.)

STF1274 AB: 178; 140x: Well split, 1 Dm.  90% PRO, 2,014 AU WS, 2.6+1.7 Msol, it is possibly binary and needs an orbit.

08h 49m 00.34s +38° 20' 42.9" P.A. 41.00 sep 9.1 mag 7.42,9.34 Sp A2 dist. 241.55 pc (787.94 l.y.)

STF1282 AB: 178; 140x: Near equal white stars, close split with low power. 29% PRO, 195 AU WS, 1.3+1.3 Msol, and RVD 0.1 < EV 4.8, with a positive PMV, it is likely binary.  SOC grade 4 orbit, 804-year period.

08h 50m 44.28s +35° 04' 15.4" P.A. 279.00 sep 3.5 mag 7.59,7.76 Sp F8 dist. 51.6 pc (168.32 l.y.)

STF1289 AB: 178; 140x: 1 Dm wide.  -4% PRO, it is not likely binary.

08h 54m 44.33s +43° 35' 04.7" P.A. 6.00 sep 3.6 mag 8.21,8.91 Sp G2V dist. 58.07 pc (189.42 l.y.)

STF1333 AB: 178; 140x: White, near equal stars, closely split. -19% PRO, it is not binary.

09h 18m 25.97s +35° 21' 51.3" P.A. 50.00 sep 1.8 mag 6.63,6.69 Sp A8V dist. 86.96 pc (283.66 l.y.)

STF1334 AB: 178; 200x: White A and yellowish green B, closely but nicely split.  23% PRO, 109 AU WS, 2.5+1.5 Msol, it is probably binary.  SOC grade 4 orbit, 2782-year period. 

09h 18m 50.64s +36° 48' 09.3" P.A. 224.00 sep 2.6 mag 3.92,6.09 Sp A1V dist. 38.27 pc (124.84 l.y.)

STF1338 AB: 178; 280x: Close split, unequal, white.  -48% PRO would indicate it is not binary, however there is a SOC grade 3 orbit, 303-year period.

09h 20m 59.40s +38° 11' 17.9" P.A. 318.00 sep 1.2 mag 6.72,7.08 Sp F2V+F4V dist. 42.66 pc (139.16 l.y.)

STF1369 AB: 178; 140x: White stars, 1 Dm, wide. -40% PRO, it is not binary.

09h 35m 22.50s +39° 57' 47.7" P.A. 150.00 sep 25.1 mag 6.98,7.98 Sp F2V dist. 85.18 pc (277.86 l.y.)

STF1377 AB: 178; 180x: Fairly closely split at low powers, 3 Dm.  21% PRO, 447 AU WS, 1.8+1.0 Msol, it is possibly binary and needs an orbit.

09h 43m 27.26s +02° 37' 39.1" P.A. 138.00 sep 4.3 mag 7.52,10.52 Sp F7V dist. 153.61 pc (501.08 l.y.)

STF1401 AB: 178; 140x: Very wide faint B.  96% PRO, 1,488 AU WS, 1.3+0.7 Msol, but RVD 2.3 > EV 1.6, it is not binary.

10h 00m 13.23s +06° 15' 02.0" P.A. 21.00 sep 23.8 mag 7.69,10.53 Sp F5 dist. 60.02 pc (195.79 l.y.)

STF1448 AC: 178; 140x: 2 Dm wide.  1% PRO, 3,001 AU WS, 3.1+1.7 Msol, but RVD 3.0 > EV 1.7, it is not binary.

10h 34m 23.24s +21° 35' 36.4" P.A. 260.00 sep 11.0 mag 7.54,9.55 Sp K0 dist. 201.21 pc (656.35 l.y.)

STT 171 AB: 178; 280x: Difficult, with seeing, very fine split, 2 Dm.  No Gaia data for the secondary.

07h 26m 39.61s +31° 37' 11.9" P.A. 138.00 sep 1.0 mag 7.39,9.19 Sp G5 dist. 159.49 pc (520.26 l.y.)

STT 174 AB: 178; 280x: 2 Dm, fairly close split.  -19% PRO, it is not binary.

07h 35m 56.00s +43° 01' 51.4" P.A. 92.00 sep 1.9 mag 6.62,8.26 Sp F0 dist. 140.65 pc (458.8 l.y.)

STT 189 AB: 178; 180x: Well spit, very faint B.  97% PRO, 767 AU WS, 2.6+1.1 Msol, and RVD 2.9 = EV 2.9.  An orbit can be tried.

08h 14m 49.01s +43° 02' 05.9" P.A. 298.00 sep 4.7 mag 6.87,10.73 Sp A2IV dist. 199.6 pc (651.1 l.y.)

STT 193 AB: 178; 140x: Wide B seen with averted vision.  -6% PRO, and RVD 4.3 > EV 1.7, it is not binary.

08h 28m 08.54s +33° 31' 44.1" P.A. 298.00 sep 13.7 mag 7.67,11.70 Sp K0

STT 200 AB: 178; 280x: 2 Dm very closely split, with seeing.  -46% PRO, it is not binary.

09h 24m 55.67s +51° 34' 26.1" P.A. 336.00 sep 1.2 mag 6.53,8.57 Sp G0IV dist. 129.2 pc (421.45 l.y.)

STTA 92 AB: 178; 140x: Very wide 2 Dm.  41% PRO, 4,153 AU WS, 1.5+1.0 Msol, but RVD 1.6 > EV 1.0, it is not binary.

08h 23m 48.93s +57° 25' 01.9" P.A. 181.00 sep 57.8 mag 7.61,9.34 Sp F2 dist. 70.22 pc (229.06 l.y.)