Sketch of Iota Leonis (Struve 1536)
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Observation Notes:
Iota Leonis was ridiculously difficult in poor seeing–only resolving for moments as a dim fuzzball that was fainter than the primary’s flickering diffraction pattern. They both appeared colorless. Smyth saw pale yellow and light blue while Hartung saw deep yellow and whitish.
| Subject | Iota Leonis (STF 1536; 78 Leonis; ADS 8148) |
| Classification | Double Star |
| Position (J2000)* | Leo [RA: 11 23 55.5 / Dec: +10 31 46.2] |
| Position Angle | AB: 97° [My Measurement 2009.9] AB: 105° [WDS 2007]* |
| Separation | AB: 3″ [My Measurement 2009.9] AB: 1.9″ [WDS 2007]* |
| Magnitudes* | A: 4.1; B: 6.7 |
| Spectral Types* | A: F4IV; B: F5V |
| Date/Time | NOV 27, 2009 – 5:30 AM MST (NOV 27, 2009 – 12:30 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 |