| Steve Bodin | ||||
| Star: Burnham 987 A-D Date & Time: 24, 25 Sept 2004, 9 pm to 11 pm local Seeing: 5-6 <1-10 Seeing Scale (10 best)>. Transparency: poorLocation of site: Silverdale WA, USA 47N 123W Site classification: suburb-rural Conditions: temp 55F, damp. Bright moon Sky darkness: 4 <Limiting magnitude> Telescope: Celestron C8 Eyepieces: DX-8263SL color video camera at prime focus, 3x and 6x Magnification: app. 350x,1000x,2000x |
Well
here is a problem, not
only is the star difficult to see due to the magnitude difference, but
the WDS
also has some confusion as to the lettering of the components. Lets try
to make
some sense of it. Firstly, this is a wide binocular double S 752
of equal
magnitude stars separated by 100 seconds and labeled AC in the WDS, but
BU 987
is here the C component!! Then Burnham went and labeled the close
component as
AB, not AC as in our list, and not Cc or CD as it should have been
lettered. So
we have two stars labeled A in this system. Hope the picture that I'll
send to
Luis will help sort this out. Also 2 other faint components were later
labled
Aa and AD but they are not paired to the same star, one for each of the
two A
components!!, comfused yet?? well I am. Measurements, BU 987, the close
difficult one, 2.92 sec at 128.0 deg PA uncertainty of 0.2 sec at 6
degrees; S
752, the wide pair, 106.6 sec at 288.3 deg PA; Aa, Fox 254 paired to S
752 A
component 21.9 sec at 71.9 deg PA; AD, Fox 254 paired to BU 987,
58.1
sec at 295.7 deg PA. |
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