36 Andromedae (Struve 73)

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Observation Notes:

This double emitted a warm yellow light and was closely spaced. Seeing was not great, so I had some trouble estimating the separation of the two stars. There was clearly a black gap between the two, and the best I could tell, the first diffraction ring seemed to bisect its companion's diffraction disc. That led me to estimate a separation of 1.2 arc seconds. PA measurements using my astrometric eyepiece on these close, jumpy doubles is pretty tough too. I came up with 315 degrees. Values noted in Brian Workman's Double Star Calculator for 2007.7 are 320.4 degrees and 1.03 arc seconds.

Subject36 Andromedae (STF 73)
ClassificationDouble Star
Position (J2000)Andromeda [RA: 00:54:58.1 / Dec: +23:37:41]*
Position Angle*315° [my measurement]
320.4° [2007.7 B. Workman DS Calculator]
Separation*1.2" [my measurement]
1.03" [2007.7 B. Workman DS Calculator]
Magnitudes*6.1 / 6.7
Spectral Types*K1IV
Date/TimeSEP 20, 2007 - 09:45 PM MST (SEP 21, 2007 - 04:45 UT)
Observing Loc.Flagstaff, AZ - Home
InstrumentOrion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag.10 mm Sirius Plössl + 2X Barlow (240X)
12 Meade Astrometric EP + 2X Barlow (200X)
ConditionsBreezy, 1st quarter moon, patchy cirrus
Seeing5/10 Pickering
TransparencyNELM Mag ~5.0
*ReferencesThe Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); Catalogue of Stellar Spectral Classifications (Skiff, 2005); Starry Night Pro Plus 5.8

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This page contains a single entry by Jeremy Perez published on September 24, 2007 3:13 AM.

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