3 Centauri

Observation Notes:

This bluish pair gave the appearance of sky blue for the primary and blue-gray for the secondary. My estimate for PA was 115°. Seeing was very poor in the area, and made the diffraction rings impossible to see clearly. My best guess was 5-10 arc seconds. Actual values are 106° and 7.9 arc seconds from a 1986 WDS measurement.

Subject 3 Centauri (H 101)
Classification Double Star
Position (J2000) [RA: 13:51:49.5 / Dec: -32:59:38]*
Position Angle* 106° (1986)
Separation* 7.9″ (1986)
Magnitudes* 4.56; 6.06
Spectral Types* B5III; B8V
Date/Time JAN 18, 2007 – 06:05 AM MST (JAN 18, 2007 – 13:05 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 Clear, calm, 7° F
Seeing 3/10
Transparency NELM Mag ~5.8
References The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

*Based on published data.

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