Eta Persei (Struve 307)

October 18, 2006: To help provide a consistent style for my double star sketches, the above sketch is a digital update to the original sketch.

Observation Notes:

The primary star was a brilliant orange, with a blue-white secondary that picked up a hint of violet from the contrast. The diffraction spikes of the primary ran right over the secondary. I estimated PA at 295° and separation at 45″. Listed values from the AL double star list are 300° and 28.3″.

Subject Double/Multiple Star: Eta Persei (STF 307)
Classification Multiple Star
Position Perseus [RA: 02:50:42 / Dec: +55:54]*
Separation* 28.3″
Magnitudes* 3.8, 8.5
Position Angle* 300°
Date/Time 08/14/05 – 12:15 AM
Observing Loc. Flagstaff, AZ – Home
Instrument Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag. 10 mm + 2X Barlow (240X)
Conditions Partly cloudy, calm, 55°F
Seeing 5/10
Transparency NELM Mag 5.8

*Based on published data.