Gamma Leonis (Algieba / Struve 1424)

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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.

SubjectGamma Leonis (Algieba / STF 1424)
ClassificationDouble 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/TimeOCT 22, 2006 - 04:20 AM MST (OCT 22, 2006 - 11:20 UT)
Observing Loc.Cinder Hills Overlook, Sunset Crater National Monument, AZ
InstrumentOrion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag.10 mm + 2X Barlow (240X)
ConditionsClear, calm
Seeing5/10
TransparencyNELM Mag 6.8+
ReferencesThe Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996), Visual Double Stars in Hipparcos (Dommanget+, 2000) via VizieR

*Based on published data.

1 Comment

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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This page contains a single entry by Jeremy Perez published on December 2, 2006 10:09 PM.

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