September 25, 2007
Alpha Piscium (Struve 202)
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Observation Notes:
The first diffraction ring on the primary of this close double appeared to fall just short of bisecting the center of its companion. I estimated a separation of 1.4 arc seconds; however, Brian Workman's Double Star Calculator gives 1.78 arc seconds. My PA measurement worked out to 268 degrees, which compares well with the calculated PA of 266 degrees. Color was pretty difficult to pick up, but appeared to be pale yellow and pale blue.
| Subject | Alpha Piscium (STF 202) |
| Classification | Double Star |
| Position (J2000) | Pisces [RA: 02:02:02.8 / Dec: +02:45:49]* |
| Position Angle* | 268° [my measurement] 266° [2007.7 Brian Workman's DS Calculator] |
| Separation* | 1.4" [my measurement] 1.78" [2007.7 Brian Workman's DS Calculator] |
| Magnitudes* | 4.3 / 5.2 |
| Spectral Types* | A0p / A3m |
| Date/Time | SEP 20, 2007 - 11:15 PM MST (SEP 21, 2007 - 06:15 UT) |
| Observing Loc. | Flagstaff, AZ - Home |
| Instrument | Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L) |
| Eyepieces/Mag. | 10 mm Sirius Plössl + 2X Barlow (240X) 12 mm Meade Astrometric EP + 2X Barlow (200X) |
| Conditions | Breezy, 1st quarter moon, patchy cirrus |
| Seeing | 5/10 Pickering |
| Transparency | NELM Mag ~5.0 |
| *References | The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996); Starry Night Pro Plus 5.8 |
Posted by Jeremy at September 25, 2007 11:32 PM .
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