Friday, September 9, 2016

more close doubles in aquila

I tried again last night for more close doubles in Aquila in the 12.5-inch.  These were not plotted in CDSA, being either too close or having too wide a magnitude difference between the pairs.  Seeing was perhaps Pickering 6-7, not really good.  I found some and missed some:

BU 265: Yes!  After quite a while of staring and focussing.  Very faint but resolved B at outer diffraction ring when seeing stills.  Yellow A, bluish B.  [7.37, 9.24; 1.4"; 1698 ly].

STF 2408:  A star resolves but is hazy.  There is an airy disk flashing out in the middle of the haze where B is.  [8.47, 9.38; 2.3"].  I wonder if the haze is due to its faintness, poor seeing, or if there is nebulosity in the area?

D 20: Didn't see AB pair (which is 9.58 1.3") despite the tight airy disk of A; but I do see faint star much further out which should be the C pair [AC 7.22, 10.51; 24.6"].  Very near to a pretty orange carbon star.

I tried another few (KUI 91, HU 72, BU 976) but could not make any of the pairs.  There was a thin fog blowing in from the ocean which interfered with seeing fainter stars.  The moon was getting too low to observe well so I packed it in early at 10:15pm




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