(IAAC) Obj: Struve 589 and other multiple stars - Inst: 17" f/15 classical Cassegrain equatorial mount


Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 1999 Jan 19 02:22 UT
Location of site: ASH Naylor Observatory, Lewisberry, PA, USA (Lat 40.15 d N, 76.9 d W, Elev 390 m)
Site classification: Exurban
Sky darkness: ~5.0 <Limiting magnitude>
Seeing: 6 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 17" f/15 classical Cassegrain equatorial mount
Magnification: 118, 202, 249, 381x
Filter(s): none
Object(s): Struve 589 and other multiple stars 
Category: Multiple star.
Constellation: Orion
Data: mag 8.0  size 
Position: RA 04h:45min  DEC +05d:17'

After observing Struve 817 at ~5h55m, +7d00' (see previous post) I moved on to 
the 33 Doubles in Orion list.  Struve 589 (page 179, U2000.0), a fairly close 
pair of 8th magnitude G5 stars that is located about 2 minutes east of a wider 
binary on the Taurus side of the Orion-Taurus border, was my next target.  I 
used 118 and 202x on both Struve 589 and the double in Taurus.  I continued to 
observe binaries until the clouds completed obscured the sky.  The other 
multiple stars that I viewed were Sh 49, Tau Orionis, Lambda Orionis, Otto 
Struve 111, Rho Orionis, Struve 609, Theta 1 Orionis (the Trapezium), Theta 2 
Orionis, Beta Orionis (Rigel), Eta Orionis, and Psi Orionis.  Some of the 
doubles (Struve 609, Eta Orionis, and Psi Orionis) were fairly difficult and 
required 249 (26mm Tele Vue Ploessl) or even 381x (17mm Pro-Optic Ploessl) for 
a clean split.  I also looked at M42 (six of the Trapezium's stars were seen at 118x) 
and M41 briefly.

Optional related URLs: http://www.msd.org/obs.htm
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