(IAAC) Obj: Delta Orionis (Mintaka) - Inst: 7" Maksutov on altaz. field tripod


Observer: Paul Haworth
Your skills: Intermediate (some years)
Date/time of observation: 1999 January 28/29 19:30UT
Location of site: Univ. London Observatory, Mill Hill, London. (Lat , Elev )
Site classification: Urban
Sky darkness: 4.5 - 5.0 <Limiting magnitude>
Seeing: III <10-1 Seeing Scale (1 best)>
Moon presence: Major - gibbous or near object
Instrument: 7" Maksutov on altaz. field tripod
Magnification: *67
Object(s): Delta Orionis (Mintaka)
Category: Multiple star.
Constellation: Orion
Data: mag   size 
Position: RA 05:32  DEC -00:18
PA estimated at ~010deg, although SkyMap suggests an almost N-S
orientation.  This error is probably due to the relative difficulty of
field orientation in an altaz scope, especially given the awkwardness
of turning a Meade SCT drive off and on to determine the direction of
star drift.  Nevertheless, the comes (SAO132221) appeared distinctly
blue (again, this may be my dodgy perception) compared to the briliant
white Mintaka, although Mintaka has a slightly 'bluer' spectral type
(O9.5 compared to B2).
Optional related URLs: http://www.ulo.ucl.ac.uk
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