Struve 1669

Observation Notes:

About a degree and a half south of the Sombrero Galaxy, M104, you’ll find the multiple star, Struve 1669. The main attraction here is a pair of 6th magnitude F class stars. When observing them, don’t forget to take in a third, tenth-magnitude star 1 arc minute to the southwest. The two brighter stars appeared to be separated by about 4 arc seconds, and resting at a PA of 315 degrees. Values in the Washington Double Star Catalog list 5.4″ from 1828 and 312 degrees from 1991. Color was tough to nail down, and I eventually settled for pale yellow for the northwest star and white for the southeast companion. Give it a look the next time you’re dancing around that nearby galactic hat and see what colors you perceive.

Subject Struve 1669
Classification Multiple Star
Position (J2000) Corvus [RA: 12:41:15.8 / Dec: -13:00:49]*
Position Angle* AB: 312° (1991); AC: 235° (1900)
Separation* AB: 5.4″ (1828); AC: 59″ (1900)
Magnitudes* A: 6.0; B: 6.1; C: 10.5
Spectral Types* F5V; F5V; –
Date/Time JAN 18, 2007 – 06:40 AM MST (JAN 18, 2007 – 13:40 UT)
Observing Loc. Flagstaff, AZ – Home
Instrument Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag. 10 mm + 2X Barlow (240X)
Conditions Clear, calm, 11° F
Seeing 4/10 Pickering
Transparency NELM Mag ~5.0
References The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

*Based on published data.