lake sonoma 20 january 2025

A nice observing window opened up last Monday night.  Clear conditions with good seeing, low possibility of dew, and a 3rd quarter moon.  I drove up to Lake Sonoma where a sizable group, for a work night, gathered, including Bob, Dan, and Steve.  The transparency was not quite perfect, as we noticed a long and persistent contrail to the west during dusk.  But Steve recorded 21.3+ on his SQM, so it was pretty good.  The drive up was 2 hours non-stop, with the usual slowdowns on 880 -- I even used the express lane all the way up 880, and it was still slow.  So much for "holiday light."

Because I planned to drive home at midnight, I kept my set-up simple, with night vision on a NP101 and 60mm ED dual mounted on a Twighlight  II, with Nexus DSC.  I also brought my monopod for 1x and 3x viewing -- though I wish I brought my mirror mount, as my primary goal for the night was at zenith...  I revisited many observations I made previously.  

My main goal was a sweep of very faint nebulosity which comes off of the California nebula NGC 1499 to the south to Sivan 4, then tuns west past Barnard 3 and north in long filamentary streams.  The stringy nebula stream stretches a whopping 20 degrees.  I've wanted to observe this for the 2 years since I first noticed it on Aladin.   I found the existence of this nebula by bringing up the Finkbeiner Ha gas line on Aladin, then using the Pixel Mapping slider to the left, which greatly enhances the view of faint extended nebula.  

Near the center of the Aladin screen shot is a comparatively brighter "H" shape, centered at roughly 03:00h RA, +37:00 Dec.  Using my 60mm refractor which has 5x and a 9-degree field of view, I pushed my scope to the position.  Starting out with a 685 longpass filter, I saw a nice field of stars, and while looking through the eyepiece flipped to a 3nm Ha, and instantly saw a broad, subtly mottled very faint nebula, as thick as half the field but steaming through all of it, orientated N-S.  It was very faint, but not difficult, and looked like a broken up, lingering contrail.  The nebula also showed fairly well with a Ha+OIII dual band, but perhaps because I knew what to look for.  I did not clearly distinguish a "H" shape, but there were some subtly brighter sections in the stream.

I proceeded to pan the telescope to follow the stream, first south-eastward.  The nebula quickly faded and became very difficult to follow until I came to the region near Barnard 3 (aka the "Wreath Nebula"), a large, round dusty cloud about 1.5x2.0 degrees, very faint and turbulent, with a brighter irregular knot in the middle, and three turbulent clouds on the east, south, and southwest periphery of the nebulous circle.  Further northeast is Sivan 4, a broad featureless glow, then NGC 1499, which was very bright and layered with filamentary streaks, especially on its long flanks.  Since NGC 1499 "points" westward toward the "H" shaped nebula, I panned in that direction, losing sight of all nebulae briefly until the filamentary trunk reappeared.  I then panned northward, and the trunk very quickly dissipated.  The nebula became very broken up and intermingled with the sky background, and I lost the trail of it the further north I panned.

I plan to re-observe this steam the next chance I get, probably with my mirror mount at 3x, to make the viewing easier on my neck.

Another highlight was IRAS 22298+6505, which the WISE website describes as a "a hidden star-forming cloud complex of dust and gas located in the constellation of Cepheus."  Observed with the 4-inch with 3nm Ha, I saw a large arc of very faint nebula which took half the field.  The inside arc was deeply crenellated with dark lanes, leaving the clear impression of dust and gas being blown out by stellar winds.  The outside arc was a sheet of mottled nebula which dissipated slowly.  I also noticed a tight round knot of brighter nebula around a star, which can be seen on the WISE image below.  As their website explains, this is the "bright blue giant star, 26 Cephei...[it] is surrounded by a bubble of cool, red dust and dust-enshrouded younger stars that may owe their existence to their older sibling."  

NGC 7380, aka the "Wizard Nebula": With the 4-inch, it appeared as a very faint crinkly arc with the Tr-band, but was transformed when flipping to the 3nm Ha.  The inside arc became very bright and the dark nebula columns were prominent.  The back end of the arc cut-off rather quickly but irregularly.  I had the sense the whole area was a dark, turbulent cloud of smoke, with only a small part of it illuminated by a candle.

Sivan 3: My prior observations were slightly tentative, only picking out a very weak nebula.  This time, with the 60mm, I had a "no doubt about it" experience.  It was still very weak, but it was immediately detected when flipping from the Tri-band (in which I didn't see anything but stars) to the 3nm Ha: a very large, curved mottled cloud, with Alpha Camelopardalis lying inside the arc.  The nebula was 3-degrees in width, which took up half the field of view, and extended a little beyond the field on either side.  I believe I did see the bow shock feature, which is the arc of brighter nebulosity near Alpha (above it, in this image, with Sivan 3 in the background) -- but I really didn't make a careful enough sketch.  I must try better next time!

15 january 2025

Rather a Jeckel and Hyde night.  After evening chores, I went out to use the Zerochromat, which I had recollimated that afternoon.  I bought a new laser collimator with a narrow beam just for the purpose.  But the views in the evening were not good at all.  Still showing coma.  The star test showed the one section of concentric, even rings as one would hope, but only around one rim.  The rest of the star test image was smeared and blurred.  I tried collimating off the star test, but it only made things worse.  I gave up for the night.  I'm fairly close to giving up altogether.  I fear I need to make alignments inside the tube, which will be difficult and iterative, since there are no means to adjust the second mirror and objective from the outside.  

After 9pm I switched to my trusty 6-inch f/15 refractor, and it performed wonderfully.  I observed for two hours and made over forty observations.  Many challenging Burnhams, Struve the Youngers, and even one Aitken, which I am surprised to be able to get with just a 6-inch.  I wonder, do I already have the ideal set-up with the 6-inch and 20-inch, am I chasing phantoms?

A   509 AB: 152; 250x: Delicate split, very faint B settles with seeing and is just visible with direct vision.  No Gaia data for the secondary.  The pair is quite far away, it is less likely to be binary, though an orbit could be tried.  

06h 37m 51.23s -08° 46' 54.1" P.A. 137.00 sep 1.4 mag 7.67,9.66 Sp K0 dist. 337.84 pc (1102.03 l.y.)

AC    3 AB: 152; 250x: Very slightly notched elongation, needs more aperture to resolve.  No Gaia data for the secondary, an orbit could be tried.

06h 11m 43.72s -04° 39' 55.6" P.A. 201.00 sep 0.7 mag 6.34,8.15 Sp B9pHgMn dist. 176.06 pc (574.31 l.y.)

ARG  12 AB: 152; 125x: Unequal, well split.  15% PRO, 1,382 AU WS, 2.4+2.4 Msol, it is possibly binary and an orbit could be tried.

06h 05m 15.92s -25° 01' 36.1" P.A. 296.00 sep 4.6 mag 8.38,8.46 Sp A2IV/V dist. 274.73 pc (896.17 l.y.)

H 5 100 AB: 152; 125x: Superwide, 4 Dm.  -95% PRO, it is not binary.

ARN  37 AC: 152; 140x: Superwide, 1 Dm.  While they share a similar proper motion, they have 0% PRO, and the WS is 19,039 AU, far too apart to be binary.

05h 58m 24.44s +01° 50' 13.6" P.A. 206.00 sep 36.7 mag 5.91,10.44 Sp A5m dist. 111.73 pc (364.46 l.y.)

BU   16 AB: 152; 250x: Excellent close pair, 3 Dm.  15% PRO, 586 AU WS, 5.2+2.5 Msol, it is probably binary and an orbit should be tried.

06h 01m 50.42s -10° 35' 52.6" P.A. 354.00 sep 2.0 mag 4.99,7.96 Sp B5III dist. 240.38 pc (784.12 l.y.)

BU   17 AB: 152; 200x: Faint B, well separated.  -88% PRO, it is not binary.

06h 08m 25.39s -11° 08' 46.6" P.A. 192.00 sep 3.6 mag 6.92,9.34 Sp A5IV dist. 104.93 pc (342.28 l.y.)

BU   18 AB: 152; 250x: Nice close pair, 2 Dm, could resolve with 140x but best seen at 250x.  -31% PRO, it is not binary.

06h 16m 41.61s -12° 02' 50.1" P.A. 286.00 sep 1.9 mag 7.06,8.42 Sp F2V dist. 161.81 pc (527.82 l.y.)

BU   19 AB: 152; 125x: 2 Dm, well split.  93% PRO, 1,607 AU WS, 4.0+2.4 Msol, however it has poor proper motion fit.  An orbit can be tried all the same.

06h 41m 59.70s -16° 00' 25.8" P.A. 167.00 sep 3.8 mag 7.07,9.00 Sp B8/9III dist. 526.32 pc (1716.86 l.y.)

BU   20 AB: 152; 250x: Fairly close, good close split, at 200x and 250x.  -16% PRO, it is not likely binary.

06h 48m 48.78s -16° 12' 41.8" P.A. 27.00 sep 3.3 mag 7.82,9.90 Sp K1III dist. 242.13 pc (789.83 l.y.)

BU  195 AB: 152; 125x: Well split 3 Dm.  -2% PRO, with nearly as much error, it is not likely binary.

06h 42m 27.58s -23° 13' 57.4" P.A. 216.00 sep 5.8 mag 7.12,9.59 Sp B3V dist. 636.94 pc (2077.7 l.y.)

BU  324 AB: 152; 250x: Close split, 2 Dm.  -20% PRO, it is not binary.

06h 49m 44.00s -24° 04' 33.7" P.A. 210.00 sep 1.8 mag 6.56,7.93 Sp A0/1V dist. 245.7 pc (801.47 l.y.)

BU  325 AB: 152; 200x: Faint pair, close split.  50% PRO, 1,406 AU WS, 4.5+3.3 Msol, though it has a weak radial velocity fit.  It is possible to be binary, an orbit should be tried.

06h 51m 49.39s -26° 34' 54.2" P.A. 38.00 sep 1.7 mag 7.86,9.11 Sp B2V dist. 1063.83 pc (3470.21 l.y.)

BU  567 AB: 152; 200x: Very much fainter, well separated B, just barely seen with direct vision, 4 Dm.  29% PRO, 313 AU WS, 2.1+0.8 Msol, with only a 0.04 PM vector.  It might be binary, an orbit should be tried. 

06h 15m 29.66s -04° 54' 52.7" P.A. 239.00 sep 4.3 mag 6.01,10.00 Sp A5IVs dist. 65.06 pc (212.23 l.y.)

BU  568 AB: 152; 250x: Barest hairline split, nearly 2 Dm, with seeing and 250x only.  26% PRO, 273 AU WS, 3.6+2.7 Msol, only 0.09 PMV, it could be binary, and orbit should be tried.

06h 23m 47.66s -19° 47' 07.6" P.A. 155.00 sep 0.8 mag 6.85,8.18 Sp B8IIIHewk dist. 411.52 pc (1342.38 l.y.)

BU  569 AB: 152; 250x: Challenging, very close split and large delta, with seeing and 250x only. -1% PRO, it is not likely binary.

06h 25m 14.75s -10° 55' 55.0" P.A. 115.00 sep 1.7 mag 7.94,9.67 Sp K0 dist. 186.22 pc (607.45 l.y.)

BU 1008 AB: 152; 200x: Propus.  Gorgeous light orange A, much fainter close B on A's diffraction ring. No Gaia data for the companion.  SOC grade 5 orbit, 1031-year period.  If the orbit is correct, the pair will drastically and quickly tighten over the next 10-20 years.

06h 14m 52.69s +22° 30' 24.6" P.A. 258.00 sep 1.8 mag 3.52,6.15 Sp M2III dist. 117.92 pc (384.66 l.y.)

GAN   2 AB: 152; 250x: Faint, wide B needed averted vision to detect, 1 Dm.  62% PRO, 245 AU WS, 0.9+0.5 Msol, and RVD 2.2 < EV 3.1, but with a low 0.01 RVD.  It might be binary, an orbit should be tried.

05h 54m 30.15s -19° 42' 15.6" P.A. 20.00 sep 10.7 mag 7.60,10.57 Sp G6V dist. 23.57 pc (76.89 l.y.)

H 2  60 AB: 152; 125x: Wide, white stars, 1 Dm.  -4% PRO, 2,715 AU WS, 3.9+2.0 Msol, it is not likely binary.

06h 36m 41.07s -22° 36' 53.1" P.A. 336.00 sep 9.0 mag 6.39,9.31 Sp B5V dist. 322.58 pc (1052.26 l.y.)

HJ 3825 AB: 152; 125x: Faint B, 3 Dm, super wide.  60% PRO, 1,772 AU WS, 1.4+0.7 Msol, but the RVD 2.6 > EV 1.4, it is not binary.

06h 02m 06.48s -27° 25' 38.2" P.A. 338.00 sep 32.7 mag 7.22,10.46 Sp F5IV/V dist. 56.82 pc (185.35 l.y.)

HJ 3863 AB: 152; 250x: Unequal close split, with 250x.  48% PRO, 724 AU WS, 3.1+2.1 Msol, it is likely binary and needs an orbit.

06h 29m 25.56s -22° 35' 27.9" P.A. 120.00 sep 2.8 mag 7.03,8.69 Sp A1V dist. 185.19 pc (604.09 l.y.)

HJ 3871 AB: 152; 125x: Easy, well split, 1 Dm.  45% PRO, 974 AU WS, 2.1+1.6 Msol, and RVD 1.1 < EV 2.6, it is likely binary and needs an orbit.

06h 34m 08.11s -29° 37' 46.8" P.A. 354.00 sep 7.7 mag 7.13,8.21 Sp A1V dist. 133.33 pc (434.92 l.y.)

HJ 3891 AB: 152; 125x: 2 Dm, nice medium split.  84% PRO, 3,014 AU WS, 6.4+3.5 Msol, it is possibly binary and needs an orbit.

06h 45m 31.20s -30° 56' 56.3" P.A. 223.00 sep 5.0 mag 5.66,8.21 Sp B2III dist. 581.4 pc (1896.53 l.y.)

S   524 AB: 152; 125x: Unequal superwide.  68% PRO, 4,979 AU WS, 1.8+1.7 Msol, and RVD 0 < EV 1.1, it is likely binary and needs an orbit.

06h 34m 07.10s +22° 07' 27.2" P.A. 244.00 sep 53.0 mag 7.17,7.41 Sp A3 dist. 85.98 pc (280.47 l.y.)

S   534 AB: 152; 125x: 3 Dm, supwewide.  65% PRO, 884 AU WS, 1.6+1.0 Msol, and RVD 1.8 < EV 2.3, it is possibly binary and needs an orbit tried.

06h 42m 46.04s -22° 26' 54.9" P.A. 145.00 sep 18.1 mag 6.27,8.30 Sp F2V dist. 54.32 pc (177.19 l.y.)

S   538 AB: 152; 125x: Superwide.  33% PRO, 5,671 AU WS, 2.7+2.1 Msol, and RVD 1.1 < EV 1.2, it is possibly binary and an orbit should be tried.

06h 49m 38.05s -24° 08' 36.5" P.A. 4.00 sep 26.9 mag 7.16,8.18 Sp A2 dist. 247.52 pc (807.41 l.y.)

SHJ  73 AB: 152; 125x: Superwide.  -59% PRO, it is not binary.

06h 36m 22.85s -18° 39' 35.6" P.A. 264.00 sep 17.4 mag 5.79,7.38 Sp G5III dist. 60.86 pc (198.53 l.y.)

STF 922 AB: 152; 200x: Well-split 3 Dm B seen with averted vision only.  -42% PRO, it is not binary.

06h 38m 18.76s +64° 44' 06.0" P.A. 138.00 sep 9.5 mag 7.66,10.82 Sp F4V dist. 78.06 pc (254.63 l.y.)

STF 929 AB: 152; 125x: Unequal, well-split, seems to float in front of the rich field.  -69% PRO, it is not binary.

06h 35m 22.03s +37° 42' 55.1" P.A. 24.00 sep 6.5 mag 7.35,8.44 Sp G5 dist. 184.16 pc (600.73 l.y.)

STF 941 AB: 152; 250x: Unequal white stars, closely split, best with high power.  -11% PRO, it is not binary.

06h 38m 40.76s +41° 34' 53.4" P.A. 83.00 sep 2.0 mag 7.25,8.17 Sp B9 dist. 344.83 pc (1124.84 l.y.)

STF3116 AB: 152; 200x: Relatively bright white A and much fainter, well separated B.  27% PRO, 2,106 AU WS, 6.3+2.6 Msol, it is possibly binary and needs an orbit.

06h 21m 24.71s -11° 46' 23.6" P.A. 23.00 sep 3.9 mag 5.55,9.70 Sp B1Vpe+B9V dist. 337.84 pc (1102.03 l.y.)

STT 123 AB: 152; 250x: Easy close split, 2 Dm.  -2% PRO, it is not likely binary.

05h 54m 09.53s +10° 14' 39.4" P.A. 187.00 sep 2.1 mag 7.34,9.05 Sp G5 dist. 132.8 pc (433.19 l.y.)

STT 125 AB: 152; 250x: Suspected at low power, nice clean split at 250x, 1 Dm. -40% PRO, it is not binary.

05h 59m 42.46s +22° 28' 15.0" sep 1.4 mag 7.89,8.89 Sp A0

STT 131 AB: 152; 250x: Very delicate close split, 4 Dm B.  No Gaia data for B.

06h 07m 25.84s +36° 16' 28.7" P.A. 277.00 sep 1.5 mag 7.04,9.45 Sp B9II dist. 301.2 pc (982.51 l.y.)

STT 132 AB: 152; 250x: Very faint B, closely separated, 4 Dm.  -94% PRO, it is not binary.

06h 08m 11.68s +37° 58' 57.9" P.A. 332.00 sep 1.8 mag 7.16,9.63 Sp A2V dist. 184.5 pc (601.84 l.y.)

STT 133 AB: 152; 250x: Close split, able to see 4 Dm B with direct vision.  Excellent pair. -1% PRO, it is probably not binary. 

06h 08m 02.39s +21° 17' 43.5" P.A. 33.00 sep 3.3 mag 7.35,11.17 Sp F0 dist. 103.09 pc (336.28 l.y.)

STT 134 AB: 152; 125x: Superwide, 2 Dm.  49% PRO, 27,171 AU WS, 5.6+3.6 Msol, it is too far apart to be binary.

06h 09m 15.94s +24° 25' 40.3" P.A. 189.00 sep 31.2 mag 7.55,9.14 Sp G0

STT 140 AB: 152; 250x: Very delicate B, close separation, 4 Dm. 17% PRO, 1,365 AU WS, 4.2+2.1 Msol, it is possibly binary and needs an orbit.

06h 26m 37.73s +15° 31' 25.3" P.A. 119.00 sep 3.0 mag 6.92,10.08 Sp B9.5IV dist. 337.84 pc (1102.03 l.y.)

STT 142 AB: 152; 200x: B flashes with averted vision only.  -3% PRO, it is not likely binary.

06h 29m 55.96s +07° 06' 43.2" P.A. 353.00 sep 8.5 mag 7.12,10.57 Sp B2.5IV/V dist. 409.84 pc (1336.9 l.y.)

STT 145 AB: 152; 250x: Wow! Super-faint B, 2 Dm, a close clean split, held direct.  No Gaia data for B.  

06h 32m 20.69s +15° 42' 22.3" P.A. 336.00 sep 1.4 mag 7.30,9.93 Sp F5 dist. 198.02 pc (645.94 l.y.)

STT 152 AB: 152; 250x: Unequal, barest hairline split.  No Gaia data for B.  Given how close it is, it is possibly binary and an orbit should be tried.

06h 39m 33.12s +28° 15' 47.4" P.A. 34.00 sep 0.8 mag 6.21,7.85 Sp B7III dist. 258.4 pc (842.9 l.y.)

STT 160 AB: 152; 250x: Very close split, with seeing B settles to just within A's diffraction ring. No Gaia data for B.  Since it is relatively close to us, an orbit should be tried.

06h 54m 21.32s +21° 09' 40.8" P.A. 188.00 sep 1.3 mag 6.66,9.92 Sp K1III dist. 118.48 pc (386.48 l.y.)

STT 545 AB: 152; 250x: Seen with 125x but best seen 250x, bright light yellow A and fairly close, much fainter B.  The refractor's clean star images make it possible.  No Gaia data for B.  SOC grade 5 orbit, 471-year period.

05h 59m 43.24s +37° 12' 45.9" P.A. 304.00 sep 4.2 mag 2.60,7.20 Sp A0V dist. 50.76 pc (165.58 l.y.)

STTA 72 AB: 152; 125x: Superwide.  -95% PRO, it is not binary.

06h 24m 43.95s +59° 40' 10.4" P.A. 305.00 sep 46.1 mag 7.58,10.84 Sp K0

WEB   5 AB: 152; 125x: Superwide 2 Dm.  100% PRO (4% error), 9,323 AU WS, 2.8+1.7 Msol, but RVD 2.1 > EV 0.9, it is not binary. 

06h 09m 39.64s +43° 08' 26.7" P.A. 216.00 sep 43.8 mag 7.10,9.19 Sp A0 dist. 258.4 pc (842.9 l.y.)

8 & 9 january 2025

A couple of frustrating nights.  Transparency was forecasted to be better than it was -- though I should have expected the low-lying marine haze which typically develops at the bottom of the bowl formed by the Bay Area's surrounding hills.  And seeing was below average to poor, so I limited myself to the 7-inch mask on my 20-inch.

I set-up and tried collimating my new-to-me 8-inch Zerochromat, but I could not get it right.  Since I removed the back plate, I think I have not reinstalled it correctly, and the tube holding the corrector is probably out of line.  I will keep it set-up in the back since we should not have any rain in the next few days.

Both nights I tried to see my "discovery" of the close faint companion to STF 560.  I could not see it with the 20-inch visually, but I did see it using night vision.  The primary was bloated, and the faint but apparent companion was sitting on the edge of the disk.  My imaging run is scheduled for next week so hopefully it will turn up this time.  BU 1046 has similar stats (5.01/12.20 4.5") to my star, and Burnham needed the 36-inch Great Refractor to "detect" it (his word).

PMV = Proper Motion Vector, a check that the two stars are travelling through space (from our perspective) at similar rates and directions.  I'm adding this to my analysis as I had neglected it before (relying mainly on parallax overlap).

STF 633 AB: 178; 140x: White stars, wide faint B seen with averted vision at first but can then hold direct.  18% PRO, 920 AU WS, 1.8+0.7 Msol, but the RVD 3.3 > EV 2.2, it is not binary.

05h 10m 42.70s +63° 35' 50.0" P.A. 342.00 sep 11.8 mag 6.77,10.57 Sp F0 dist. 86.13 pc (280.96 l.y.)

STF 638 AB: 178; 140x: Well separated, nearly 1 Dm, light orange stars.  -68% PRO, it is not binary.

05h 14m 19.85s +69° 49' 25.3" P.A. 221.00 sep 5.3 mag 7.52,9.06 Sp K1IV dist. 102.99 pc (335.95 l.y.)

STF 661 AB: 178; 300x: Poor seeing, closely separated white stars, 4 Dm.  -82% PRO, it is not binary.

05h 13m 13.87s -12° 56' 26.4" P.A. 357.00 sep 2.2 mag 4.43,6.77 Sp B9V dist. 223.21 pc (728.11 l.y.)

STF 667 AB: 178; 140: Light orange A, well separated, 2 Dm.  -38% PRO, it is not binary.

05h 14m 41.31s -07° 04' 18.1" P.A. 315.00 sep 4.2 mag 7.15,8.78 Sp K2 dist. 297.62 pc (970.84 l.y.)

STF 670 AB: 178; 140x: Close split with low magnification, half Dm.  -65% PRO, it is not binary.

05h 16m 43.88s +18° 26' 22.4" P.A. 165.00 sep 2.6 mag 7.72,8.28 Sp B3V dist. 199.2 pc (649.79 l.y.)

STF 674 AB: 178; 140x: White stars, well separated, 3 Dm.  15% PRO, 730 AU WS, 1.8+0.9 Msol, it is possibly binary and needs an orbit.

05h 17m 31.15s +20° 07' 54.6" P.A. 149.00 sep 10.1 mag 6.82,9.68 Sp F7V+F5IV dist. 81.1 pc (264.55 l.y.)

STF 680 AB: 178: 140x: White stars, well separated, 4 Dm.  50% PRO, 997 AU WS, 2.6+1.0 Msol, but RVD 4.1 > EV 2.6, it is not binary.

05h 19m 14.69s +20° 08' 04.5" P.A. 203.00 sep 9.1 mag 6.22,9.66 Sp K0III dist. 120.34 pc (392.55 l.y.)

STF 688 AB: 178; 140x: Near equal, well separated.  69% PRO, 2,066 AU WS, 2.5+2.4 Msol, RVD 0.7 < EV 2.1, good PMV, it is likely binary and needs an orbit.

05h 19m 20.88s -10° 44' 49.9" P.A. 95.00 sep 10.5 mag 7.52,7.55 Sp K3V+F1

STF 701 AB: 178; 140x: White A, light yellow B, well separated, 3 Dm.  74% PRO, 865 AU WS, 2.8+1.8 Msol, weak PMV.  It is possibly binary and an orbit should be tried.

05h 23m 18.50s -08° 24' 55.9" P.A. 138.00 sep 6.2 mag 6.13,8.09 Sp B8III dist. 122.7 pc (400.25 l.y.)

STF 743 AB: 178; 300x: Close separation, white stars, 1 Dm.  -30% PRO, it is not binary.  

05h 34m 43.20s -04° 23' 31.5" P.A. 283.00 sep 1.8 mag 7.74,8.25 Sp B5V

STF 752 AB: 178; 140x: Bright A and faint wide B.  Too large of a parallax error to tell if binary.  It has negative PMV, and not likely to be binary.

05h 35m 25.98s -05° 54' 35.6" P.A. 141.00 sep 11.2 mag 2.77,7.73 Sp +B8III dist. 714.29 pc (2330.01 l.y.)

STF 774 AB: 178; 140x: Closely separated with 140x, but the bright primary's disk and diffraction are so expanded with the poor seeing, it nearly touches the companion.  Too bright for Gaia, no data.  There is a SOC grade 5 orbit, 1508-year period, so who knows?

05h 40m 45.52s -01° 56' 33.3" P.A. 166.00 sep 2.4 mag 1.88,3.70 Sp +B0III dist. 225.73 pc (736.33 l.y.)

STF 790 AB: 178; 140x: Light orange A and yellow wide B, 2 Dm.  -21% PRO, and RVD 3.3 > EV 3.0, it is not binary.

05h 46m 02.87s -04° 16' 06.5" P.A. 88.00 sep 7.0 mag 6.43,8.98 Sp G8III: dist. 111.48 pc (363.65 l.y.)