Gamma Leonis (Algieba / Struve 1424)

Observation Notes:

This was a stunning, pair of close orange-yellow stars. Their color reminded me of our own sun’s hue during a clear, warm sunset. PA appeared to be about 130 degrees, which compares with the 1990 value of 123 degrees from the WDS Catalog. The stars were separated by about three first-diffraction-ring widths, center to center, which works out to around 3.7 arcseconds. The 1990 WDS value is 4.6 arcseconds.

Subject Gamma Leonis (Algieba / STF 1424)
Classification Double Star
Position (J2000) [RA: 10:19:58.5 / Dec: +19:59:28]*
Position Angle* 102° (1828)
123° (1990)
Separation* 2.5″ (1828)
4.6″ (1990)
Magnitudes* A = 2.6; B = 3.8
Spectral Types* A = K0; B = K0
Date/Time OCT 22, 2006 – 04:20 AM MST (OCT 22, 2006 – 11:20 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.

One Reply to “Gamma Leonis (Algieba / Struve 1424)”

  1. Great diagram and comments! I was just observing Algieba through my new William Optics 88mm refractor and wondered what the separation and PA were. Your drawing and notes were exactly what I was looking for. Really helpful!

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