February 2007 Archives

24 Comae Berenices (Struve 1657)

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Click above image for larger version 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...

Struve 1669

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Observation Notes: About a degree and a half south of the Sombrero Galaxy, M104, you'll find the multiple star, Struve 1669. The main attraction here is a pair of 6th magnitude F class stars. When observing them, don't forget to take in a third, tenth-magnitude star 1 arc minute...

Delta Corvi

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Observation Notes: Have you ever seen a brownish-gray star? Probably not if it wasn't plunked down right next to a bright, colorful companion. This pair featured a pale sky blue primary with a secondary that appeared brownish-gray by comparison. According to the Catalog of Stellar Spectral Classifications (Skiff, 2005),...

3 Centauri

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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...

N Hydrae

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Observation Notes: I was unable to tell which star was the primary, so the PA appeared to be either 203° or 157°. Separation seemed to be about 10 arc seconds. WDS values from 1783 are 210° and 9.3 arc seconds. That's a pretty old measurement, and I'm not sure...

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