24 Comae Berenices (Struve 1657)


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Observation Notes:

This widely spaced double in Coma Berenices is a real showpiece, particularly when seeing conditions are good. The primary is a deep yellow-orange in color with a rich blue secondary hovering to the west. The steadily shimmering diffraction rings made them look like colorful gemstones resting in their settings. I estimated a position angle of 280 degrees and a separation of 20 - 25 arc seconds. The values listed in the Washington Double Star Catalog from 1830 are 271 degrees and 20.3 arc seconds. I'm including a 'frozen' detail image in the sketch to convey what this effect looked like.

Subject24 Comae Berenices (STF 1657)
ClassificationDouble Star
Position (J2000)Coma Berenices [RA: 12:35:07.7 / Dec: +18:22:37]*
Position Angle*271° (1830)
Separation*20.3" (1830)
Magnitudes*5.2; 6.7
Spectral Types*K0; A3
Date/TimeJAN 26, 2007 - 06:20 AM MST (JAN 26, 2007 - 13:20 UT)
Observing Loc.Flagstaff, AZ - Home
InstrumentOrion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag.10 mm + 2X Barlow (240X)
ConditionsClear, calm, 18° F
Seeing6/10 Pickering
TransparencyNELM Mag ~5.8
ReferencesThe Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); Visual Double Stars in Hipparcos (Dommanget+, 2000)
*Based on published data.


Very nice sketch of a beautiful pair. A small mistake in the text: the separation is around 20 arcseconds, obviously not 20 arcminutes

Great catch! Thanks very much for the heads-up and giving me a chance to fix that.


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This page contains a single entry by Jeremy Perez published on February 28, 2007 10:43 PM.

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