Monday, November 26, 2018

a few burnhams

The rain last week pushed the bad air from the Bay Area.  With more on the way this week, there was a gap last night of relatively clear skies.  Transparency was poor (in fact the whole northeast was covered in low clouds), and dew was pretty heavy, but seeing was a decent 7/10.  Viewed what close doubles I could with Big Blue, 553x:

BU 1095: Very bright yellow- white A.  B is a very faint but consistent point resolved just beyond the first diffraction ring when seeing stills.  Nice to start off the night with this! [AB seen; AC and AD very wide and faint.]
00H 30M 07.34S +29° 45' 06.1" P.A. 16 SEP 2 MAG 5.22,13.10 SP A7III DIST. 62.77 PC (204.76 L.Y.)

STF 47: Easy; likely a triple.  Orange A star with 1.5 delta mag. B, 10".  Third star another 1 delta mag, further out in a similar PA.  [Correct about the triple; BU 1348 is the third star out, which is paired with both A and B -- pretty weird orbit, trying to picture it...]
00H 40M 19.78S +24° 03' 14.0" P.A. 205 SEP 16.6 MAG 7.25,8.82 SP A4III DIST. 131.58 PC (429.21 L.Y.)

BU 1310: Pretty orange stars but pairs are too faint; try with the 20-inch.  The equatorial platform is knocking (problem with the motor?) which interferes with the view; every couple of seconds a shudder through the scope.
00H 32M 39.47S +23° 11' 36.1" P.A. 213 SEP 3.8 MAG 6.86,11.80 SP G5IV DIST. 137.74 PC (449.31 L.Y.)

Ho 204: Nope.  Too faint.  Near zenith so tough to center.  Try in the 20.
23H 52M 14.16S +28° 34' 35.8" P.A. 357 SEP 5.7 MAG 8.52,10.70 SP K2

Ho 215 = 45 And: Disk seems not round but far for me to claim it.  try in the 20.
01H 11M 10.29S +37° 43' 26.9" P.A. 225 SEP 0.1 MAG 6.60,6.60 SP B7III-IV DIST. 242.13 PC (789.83 L.Y.)

BU 1147 = 2 And: Shard of light in the first diffraction ring.  But that's too far out (~1") to be it?  Try the 20.
3H 02M 36.34S +42° 45' 28.1" P.A. 137.7 SEP 0.05 MAG 5.19,7.70 SP A3VN DIST. 129.2 PC (421.45 L.Y.)

STF 2973: Yellow-white and surprisingly faint B -- appears as a haze and then a point appears with seeing; almost need averted vision.
23H 02M 45.15S +44° 03' 31.5" P.A. 39 SEP 7.5 MAG 6.41,10.14 SP B2V

Bvd 142: Orange stars, 1 delta mag, well separated (finder split).  B looks suspiciously like a pair -- but the transparency may be causing it to smear.  [!! This is quite an amazing catch considering the conditions!  AB is as described 7.80/10.28 79.6".  B is indeed a pair: TDT 3916 = BaBb, 10.69/11.41 0.6".  Discovered in 1991 and only one observation!  Holy cow!  Definitely try the 20!]
23H 10M 29.28S +41° 19' 18.7" P.A. 165 SEP 79.6 MAG 7.80,10.28 SP F5V+K0V

STF 2992: Well separated 2 delta mag. [AB seen; AC too faint]
23H 13M 06.32S +40° 00' 10.1" P.A. 285 SEP 14.3 MAG 7.66,9.59 SP A7III

NGC 7662: Blue Snowball, planetary nebula.  Even with poor transparency, near full moon, and red zone light pollution, this high surface brightness object shows.  Round shell, cut off slightly on one side; soft edges.  Two arcs of brighter filaments within the shell and hints of more detail.  No color; OIII no help (dims the object, actually)


STT 500: Disk seems not round, but unsure.  Try the 20.
23H 37M 32.03S +44° 25' 44.5" P.A. 20.3 SEP 0.4 MAG 6.08,7.38 SP B8V DIST. 247.52 PC (807.41 L.Y.)

BU 995: ! Very fine 4 delta mag, <0.8"
23H 47M 33.04S +46° 49' 57.2" P.A. 250 SEP 0.8 MAG 6.11,8.73 SP B3IV

BU 9001: Faint companion, wide separation. [AC seen.  AB, weirdly, is ES 9001, B star is fainter at 13.70 than C star.  AC Burnham was first in 1893, Espin AB second in 1914?  Why the reversed letter designation?]
00H 05M 09.75S +45° 13' 44.5" P.A. 235 SEP 21 MAG 6.69,10.58 SP A1VN DIST. 138.5 PC (451.79 L.Y.)

BU 997: Orange and blue, pretty, well separated.
00H 04M 57.53S +45° 40' 25.6" P.A. 337 SEP 3.8 MAG 7.64,9.39 SP F8IV-V DIST. 71.12 PC (231.99 L.Y.)

No comments:

Post a Comment