Theta 1 Orionis (Struve 748) – The Trapezium


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:

Even in poor seeing, the trapezium is spectacular. The A-D stars were simple to spot, with the C star being the brightest. I stared long enough that occasional moments of better seeing gave me a peek at the E star; but the F star wasn’t there at all.

Subject Double/Multiple Star: Theta 1 Orion / 41-Ori [ALDS23]
Classification Multiple Star
Position Orion [RA: 05:35.3 / Dec: -05:23]*
Separation* 8.8″,13″,21.5″
Magnitudes* 6.7, 7.9, 5.1, 6.7
Position Angle* 31�, 132�, 96�
Date/Time 01/17/05 – 10:25 PM
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 Clear, cool (39�F), 1st quarter Moon

Seeing 3/10
Transparency Mag 5.2

*Based on published data.

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