Wednesday, March 30, 2016

double wanderings

As neither seeing nor transparency was especially good last night, I used my double star atlas to look at some random doubles.  I pointed the 12.5-inch at Alnath (Beta Tauri, though it is shared with Auriga) and used the slow motion controls to go to any nearby star which had a line through it on the atlas -- the sign of a double.  Some had a designation but others did not -- a signal that the pairing would be very close or of widely varying magnitudes.  The ballast I constructed on the back of my dobsonian base seemed to help cancel some of the vibration issues I had, and removing the counterweights from the back of the telescope tube helped the altitude fine control move freely.  Progress.  I didn't try astrometry as the seeing was too unstable; all viewed at 277x

STF719: widely separated with an orange A and bluish B

STF753: I thought this was perhaps a 3x system [it's not].  Bright yellow A and a fainter yellow white B.

STF764: two bright whites widely separated

Anonymous half a degree to the NE: orange A, faint bluish B, pretty close

Anon. 10 mins. to east of that: really close, just split stars; equal brightness; both yellowish but the A star is more yellow and a little more bright

STT117.  !! Wow!  Carbon star to the west in FOV.  OS is a bright yellow A and a small faint B.  Lovely, colorful field.

STF796: Pretty yellow and faint blue

Had a look at M37, always a treat.  It was the first deep sky object I found by myself, just two years ago.

Mil2: First time I've seen this designation, J.A. Miller, an American astronomer in the late 19th century.  Name lives on.  It was an easy find and split.  A white A and slightly ruddy B.

Seeing was getting better at this point...

Bright anon about 20 min. to east of Mil2: Did not split at 277x so tried 554x, but no clear split.  I suspected an exceedingly faint star below it in FOV, widely separated, but not certain.

Bright anon half a degree to NW of 136 Tauri: average star, very faint B comes and goes with seeing.

132 Tauri: Orange, bright, very faint B widely separated

STT66: Wide separation orange stars of similar brightness

Anon 1 degree to N: Is it a 4x system?  or a double-double?  Two equal bright whites widely separated, and perpendicular to those another pair, much fainter, about the same separation

STF749: Hair-split, equal brightness white stars.  Nice.

STF716: Equal white widely separated.

H V 114: Fairly widely separated; faint star a 3rd? [no].

Had a look at open cluster NGC 1746: a nice wide spread with scattered grouping; much better under a darker sky.

I ended the evening looking at Jupiter.  The NEB & SEB were very turbulent, with large dark rust barges and great loops of purple festoons cresting up like waves, especially from the NEB into the equatorial region.  There was even a dark tan barge in the NTB.  The north polar region seemed lighter, and more banded, than the south which was darker and more solid in color.  No GRS or lunar transits.

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