Otto Struve 525


October 17, 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:

This pair exhibited beautiful color at low power. The brighter southern star was yellow-orange, while the norther was blue. It was a nice contrast. I guessed a separation of 75″–it’s actually 45″. Man I need to work on that. The position angle in the sketch of approximately 350° matches the AL list measurement on the dot. The faintest star I plotted in the sketch was mag 12.7 GSC 0264701827.

Subject Double/Multiple Star: Otto Struve 525
Classification Multiple Star
Position Lyra [RA: 18:54:54 / Dec: +33:58]*
Separation* 45″
Magnitudes* 6.0, 7.7
Position Angle* 350°
Date/Time 07/30/05 – 12:50 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, breezy
Seeing 2-3/10
Transparency NELM Mag 5.2

*Based on published data.

2 Replies to “Otto Struve 525”

  1. I just found your entry after viewing this beautiful binary last night with my Meade 8″ LX200. I’m checking off the Astroleague Double Star Observing Club 100, having observed 40 so far.
    Thanks for this post, as it confirms the observation I made myself.

  2. Hi Steve, I’m glad the observation was helpful. It’s one of my earlier observations and I wasn’t as detailed with my PA and Separation estimates, so it’s good to know that it compared well with what you saw. I hope you enjoy the rest of the AL Double Star list.

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