Monday, September 12, 2016

imaged HR 8025 (Halifax)

The BGO robot imaged HR 8025 for me. A double star in Cygnus.

double star HR 8025 luminance

Luminance only, 5 seconds subexposures, 10 stacked shots. FITS Liberator, Paint.NET. North is up; left is east.

I wanted to revisit this target as I had not been able to split out the B star.

is the B star just barely visible to the north-north-west?

Do you see it?! There's a faint little blip at the 1 o'clock position? Just to the right of the diffraction spike? Nutty!

I had to really dial back the brightness in FITS Liberator to coax it out...

According to SkyTools, A is 5.83 and B is 13.5. They are 7.3" apart. And the PA is 348° (as of 1934!). Very nutty.

The Washington Double Star database has some more recent data, from 2000. The first measure, from 1888, shows the separation (rho) was 6.9 with a position angle (theta) of 344. In 2000, the sep. was 7.1 and PA was 350. Interesting... The magnitudes are in agreement.

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