(IAAC) Obj: NGC 40 - Inst: 20" f/10 classical Cassegrain equatorial mount


Observer: Dave Mitsky
Your skills: Intermediate (some years)
Date/time of observation: 1999/10/13 01:10 UT
Location of site: Colebrook, PA, USA (Lat , Elev )
Site classification: Rural
Sky darkness: 5.5 <Limiting magnitude>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: Minor - crescent or far from object
Instrument: 20" f/10 classical Cassegrain equatorial mount
Magnification: 159 and 203x
Filter(s): None
Object(s): NGC 40 
Category: Planetary nebula.
Constellation: Cepheus
Data: mag 10.2  size 0.6'
Position: RA 00h:13.0m  DEC +72d:32'

On this occasion some friends and I used a Rainbow Optics Star Spectroscope 
diffraction grating and a 28mm ortho (159x) to view the spectrum of the 11.6 
magnitude Wolf-Rayet central star of the Herschel 400 planetary nebula NGC 40.  
Ionized carbon produced a bright emission line in the star's spectrum.  NGC 40
has diameter of about 1 light year and is some 3500 light years distant.  A bit
later we looked at the many dark absorption lines in the spectrum of the
variable star Mira.  Mira, a type M supergiant, was dimly visible to the 
unaided eye. 
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