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Deep Sky Object Table Column Headings

Const Standard 3-letter abbreviation of constellation name
Messier no Messier catalogue number
NGC no New General Catalogue number
IC no Index Catalogue number
UGC no Uppsala General Catalogue number
Type Type attribute list (+ delimited). Not all of these are used, but possible types are: GAL=galaxy, IGAL=interacting galaxy, GLOB=globular cluster, OPEN=open cluster, PNEB=planetary nebula, DNEB=diffuse nebula, ENEB=emission nebula, RNEB=reflection nebula, NEB=nebula, AST=aterism, MSTAR=multiple star, TRPL=triple star, DBL=double star, SNGL=single star, (no)=object called nonexistent in RNGC (1973), PDEF=photographic plate defect, UNSO=unverified southern object, LMC=object in Large Magellanic Cloud, SMC=object in Small Magellanic Cloud, and of special note GLOB+GAL=globula cluster in external galaxy, OPEN+GAL=open cluster in external galaxy, DNEB+GAL=diffuse nebula in external galaxy.
RA hr Right ascension hours
RA min Right ascension minutes
RA sec Right ascension seconds
DEC +- Declination sign
DEC deg Declination degrees
DEC min Declination minutes
DEC sec Declination seconds
Size Major axis size / Minor axis size (arc seconds)
Mag Integrated magnitude
Posn angle Position angle of major axis (0 to 180 conventional North through East etc.)
Incl 1=f, 5=e Inclination (1=face on through 5=edge on)
Rating Meade object rating (SU=superb, EX=excellent, VG=very good, GD=good, FR=fair, PR=poor, VP=very poor)
Pos err Position error (arc minutes - see note below)
Name Common name(s) (/ delimited). If the last word is GALAXY, NEBULA or CLUSTER it applies to all names separated by a / in the list.

All co-ordinate values are epoch J2000. These values have either been taken directly from ADC sources or have been calculated from earlier epoch values.

A position error value represents the difference between the co-ordinates known to the LX200 and the current values due to the precession of the Earth's axis of rotation. Most values are small enough to be of little concern.

Please note that the NGC catalogue (from which some of the deep sky object information contained on this web site was derived) was obtained from the Astronomical Data Center, and was supplied to them courtesy of Sky Publishing Corporation.