Sketch of 83 Leonis / Struve 1540
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Observation Notes:
This yellow and red-orange pair consists of a G7V primary and K4V secondary. Sissy Haas sees them as yellow-white and gray. They make a striking, low-power, double-double with nearby Tau Leonis.
| Subject | 83 Leonis (Struve 1540 / STF 1540 / ADS 8162) |
| Classification | Double Star |
| Position (J2000)* | Leo [RA: 11 26 45.3 / Dec: +03 00 47.2] |
| Position Angle | AB: 150° [My Measurement 2009.9] AB: 150° [WDS 2008]* |
| Separation | AB: 29″ [My Measurement 2009.9] AB: 28.2″ [WDS 2008]* |
| Magnitudes* | A: 6.6; B: 7.5 |
| Spectral Types* | A: G7V; B: K4V |
| Date/Time | NOV 27, 2009 – 5:05 AM MST (NOV 27, 2009 – 12:05 UT) |
| Observing Loc. | Flagstaff, AZ – Home |
| Instrument | Orion SkyQuest XT8 Dobsonian (203 mm dia./1200 mm F/L) |
| Eyepieces/Mag. | Pentax XW10 + 2X Barlow (240X) Meade Astrometric EP + 2X Barlow (200X) |
| Conditions | Clear, cold, hazy |
| Seeing | 3-4/10 Pickering |
| Transparency | Mag 5.5 NELM |
| *References | The Washington Visual Double Star Catalog (Mason+ 2001-2009); Catalogue of Stellar Spectral Classifications (Skiff, 2009); SIMBAD; Double Stars for Small Telescopes – Sissy Haas |