Saturday, February 27, 2016

verified double near ACO 779

Sorted the possible double star near ACO 779. It exists.

Back in early April 2014, while hunting for a supernova in the galaxy cluster ACO 779, I had noted a double star to the south-east. But this double was not shown in the SkyTools 3 Pro software. It shows TYC 02496-1118 1 as a single orange star.

photograph from Aladin of stars near ACO 779

I checked the Aladin atlas. Closely matches my photo. The double, in this image, is below and slightly left.

I checked the WDS. I found something, an entry for the designated location:

09198+3344HJ 2493 1831 2014 6 170 162 6.0 10.3 11.16 11.7 +011-007 +016-007 091951.68+334238.2

Parsed the data.

full WDS identifier:    09198+3344HJ 2493
number of observations:    6
magnitudes:    11.16    11.7

observations:    first;    last
date:    1831    2014
theta (PA) °:    170    162
rho (sep.) ":    6    10.3
proper motion RA ":    11    16
proper motion Dec ":    -7    -7

precise coord. J2000:    091951.68+334238.2
precise decimals RA:    09h19m51.68s
precise decimals Dec:    33°42'38.2"

So, nothing surprising here (again). I had seen a known double, HJ 2493, discovered by John Herschel. The issue is that it is not in ST3P.

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