Sigma Coronae Borealis (Struve 2032)


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Observation Notes:

Sigma Coronae Borealis was a beautiful multiple star. The primary was a rich yellow with a reddish purple secondary right next to it. A third component (the D star) lingered to the east. The two closest stars, A and B, were separated by the radius of 6 diffraction rings. This works out to 7.4 arcseconds. The 2007.3 value from Brian Workman’s double star calculator yields a separation of 7.15 arcseconds. I did not spot the C component, a 13th magnitude star 21 arcseconds to the west.

Subject Sigma Coronae Borealis (STF 2032)
Classification Multiple Star
Position (J2000) Corona Borealis [RA: 16:14:40.6 / Dec: +33:51:30]*
Position Angle* AB: 237.1° (2007.3) / AC: 234° (1851) / AD: 89° (1836)
Separation* AB: 7.15″ (2007.3) / AC: 21.2″ (1851) / AD: 43.8″ (1836)
Magnitudes* A: 5.8 / B: 6.7 / C: 13.3 / D: 10.8
Spectral Types*
Date/Time APR 29, 2007 – 01:50 AM MST (APR 29, 2007 – 08:50 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 Mostly clear, slightly breezy, nearly full moon
Seeing 5-6/10 Pickering
Transparency NELM Mag ~5.0
References The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); Brian Workman’s Double Star Calculator

*Based on published data.

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