Alpha Leonis (Regulus / Struve 6)

Observation Notes:

Regulus makes for a wide double with a brilliant blue-white primary that gave a reddish purple appearance to its G-type secondary star. Separation appeared to be 1/3 of the field of view, or about 240 arc seconds. The actual value is 178 arc seconds (or about 1/4 of the field). So I managed to mess that estimate up a bit. My PA estimate of 315 degrees was in pretty good shape compared to the actual value of 307 degrees.

Subject Alpha Leonis (Regulus / STF 6)
Classification Double Star
Position (J2000) [RA: 10:08:22.1 / Dec: +11:58:01]*
Position Angle* 307° (1836)
Separation* 177.6″ (1960)
Magnitudes* A = 1.35; B = 8.12
Spectral Types* A = B7V; B = G
Date/Time OCT 22, 2006 – 04:10 AM MST (OCT 22, 2006 – 11:10 UT)
Observing Loc. Cinder Hills Overlook, Sunset Crater National Monument, AZ
Instrument Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag. 10 mm + 2X Barlow (240X)
Conditions Clear, calm

Seeing 5/10
Transparency NELM Mag 6.8+
References The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996), Visual Double Stars in Hipparcos (Dommanget+, 2000) via VizieR

*Based on published data.

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