Observation Notes:
This double was fairly wide–about 60 arc seconds by my estimate. The WDS value from 1835 is 43.7 arc seconds. PA appeared to be about 155° which compares to 150° from the WDS. Color was a bit elusive, but if anything, the primary appeared light yellow with a light blue secondary. According to CSSC/Skiff, the primary is A3 and the secondary is F0V. So the combo is actually light blue and white.
| Subject | Zeta Lyrae (STF 38) |
| Classification | Double Star |
| Position (J2000) | [RA: 18:44:46.3 / Dec: +37:36:18]* |
| Position Angle* | 150° (1835) |
| Separation* | 43.7″ (1835) |
| Magnitudes* | 4.36/5.73 |
| Spectral Types* | A3/F0V |
| Date/Time | SEP 04, 2006 – 1:10 AM MST (SEP 04, 2006 – 08:10 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 |
| Seeing | 5/10 |
| Transparency | NELM Mag ~4.0 |
| References | The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996) and Catalogue of Stellar Spectral Classifications (Skiff, 2005) via VizieR |
*Based on published data.