Sketch of Tau and 83 Leonis / Struve-A 19 and Struve 1540
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Observation Notes:
This striking double double consists of widely spaced, colorful Tau Leonis (orange-yellow and blue) and 83 Leonis (yellow and red-orange).
| Subject |
Tau Leonis (84 LEO / Struve-A 19 / STFA 19) 83 Leonis (Struve 1540 / STF 1540 / ADS 8162) |
| Classification | Double Star |
| Position (J2000)* |
Leo: Tau LEO: [RA: 11 27 56.2 / Dec: +02 51 22.6] 83 LEO: [RA: 11 26 45.3 / Dec: +03 00 47.2] |
| Position Angle |
Tau LEO: AB: 185° [My Measurement 2009.9] AB: 181° [WDS 2004]* 83 LEO: AB: 150° [My Measurement 2009.9] AB: 150° [WDS 2008]* |
| Separation |
Tau LEO: AB: 90" [My Measurement 2009.9] AB: 88.9" [WDS 2004]* 83 LEO: AB: 29" [My Measurement 2009.9] AB: 28.2" [WDS 2008]* |
| Magnitudes* |
Tau LEO: A: 5.1; B: 7.1 83 LEO: A: 6.6; B: 7.5 |
| Spectral Types* |
Tau LEO: A: G8II-III; B: G5 83 LEO: A: G7V; B: K4V |
| Date/Time | NOV 27, 2009 - 5:05-5:15 AM MST (NOV 27, 2009 - 12:05-12:15 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 |
