Struve 1521

Sketch of Struve 1521 (STF 1521)

Sketch of Struve 1521

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Observation Notes:

The diffraction patterns were subtle, and color elusive. The primary appeared palest blue, and I couldn’t shake the impression of a dull orange secondary.

Subject Struve 1521 (STF 1521 / ADS 8105)
Classification Double Star
Position (J2000)* Leo [RA: 11 15 21 / Dec: +27 34 15.6]
Position Angle AB: 97° [My Measurement 2009.9]
AB: 97° [WDS 2007]*
Separation AB: 5″ [My Measurement 2009.9]
AB: 3.7″ [WDS 2007]*
Magnitudes* A: 7.7; B: 8.1
Spectral Types* A: A7III; B: A8IV
Date/Time NOV 26, 2009 – 5:20 AM (NOV 26, 2009 – 12:20 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
Seeing 3/10 Pickering
Transparency Mag 6.0 NELM
*References The Washington Visual Double Star Catalog (Mason+ 2001-2009); Catalogue of Stellar Spectral Classifications (Skiff, 2009); SIMBAD

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