wrong position angle & dist for 61 Cygni binary

Bug #1299412 reported by Robert Toop on 2014-03-29
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

The position angle for 61 Cyg A to B appears to be 90 degrees; should be 152 degrees.
The separation appears to be 48 arcsec; should be 31.5 arcsec.
Good news is that cranking back the clock in Stellarium 0.12.4 shows proper motion that matches 1916 & 1948 photos in "Burnham's Celestial Handbook."

I love this program, but until now I assumed ALL star positions were based on Hipparchos satellite. Is there a problem with close doubles in general?

Alexander Wolf (alexwolf) wrote :

Stellarium doesn't model binary stars.

Bogdan Marinov (daggerstab) wrote :

I didn't know that, but it turns out that 61 Cygni is famous for its large proper motion - a few arc-seconds per year. The Hipparcos (no H, unlike the ancient astronomer) spacecraft operated until 1993. It's completely possible that Stellarium's dataset is out-of-date in some cases, such as this one.

Changed in stellarium:
status: New → Confirmed
tags: added: catalog
Changed in stellarium:
importance: Undecided → Low
tags: added: double-stars
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