83 Leonis (Struve 1540)

Sketch of 83 Leonis (Struve 1540 / STF 1540)

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

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