Struve 2259

Sketch of Struve 2259/STF 2259

Sketch of Struve 2259

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Observation Notes:

Struve 2259 hit the top of my double star favorites the moment it came into view. It is a beautiful gold/blue pair at the heart of a starry bow-tie dominated by the brilliant white Nu Herculis. It looked best at 120X in a 35 arc minute wide field. I used this observation to demonstrate white ink/pastel-on-black sketching techniques in the June 2009 Drawn to the Universe column. The illustration above is generated using my usual digital double star technique. If you’re touring Hercules, take a moment to breeze over to Nu Herculis, drop southeast about 12 arc minutes and take in this magnificent sight.

Subject STF 2259 (ADS 10955)
Classification Double Star
Position (J2000)* Hercules [RA: 17 59 03.6 / Dec: +30 02 56.1]
Position Angle 278° [My Measurement 2009.3]
277° [WDS 2008]*
Separation 22″ [My Measurement 2009.3]
19.6″ [WDS 2008]*
Magnitudes* A: 7.2; B: 8.4
Spectral Types* A: G8II-III; B: A1V
Date/Time APR 5, 2009 – 1:30 AM (APR 5, 2008 – 08:30 UT)
Observing Loc. Flagstaff, AZ – Home
Instrument Orion SkyQuest XT8 Dobsonian (203 mm dia./1200 mm F/L)
Eyepieces/Mag. Pentax XW10 (120X)
Meade Astrometric EP + 2X Barlow (200X)
Conditions Clear, light breeze
Seeing 5/10 Pickering
Transparency Mag 5.0 NELM
*References The Washington Visual Double Star Catalog (Mason+ 2001-2009); Catalogue of Stellar Spectral Classifications (Skiff, 2009); SIMBAD