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NGC_guide.txt
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NGC_guide.txt
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- Name: Object name composed by catalog + number
NGC: New General Catalogue
IC: Index Catalogue
- Type: Object type
*: Star
**: Double star
*Ass: Association of stars
OCl: Open Cluster
GCl: Globular Cluster
Cl+N: Star cluster + Nebula
G: Galaxy
GPair: Galaxy Pair
GTrpl: Galaxy Triplet
GGroup: Group of galaxies
PN: Planetary Nebula
HII: HII Ionized region
DrkN: Dark Nebula
EmN: Emission Nebula
Neb: Nebula
RfN: Reflection Nebula
SNR: Supernova remnant
Nova: Nova star
NonEx: Nonexistent object
Dup: Duplicated object (see NGC or IC columns to find the master object)
Other: Other classification (see object notes)
- RA: Right Ascension in J2000 Epoch (HH:MM:SS.SS)
- Dec: Declination in J2000 Epoch (+/-DD:MM:SS.SS)
- Const: Constellation where the object is located
Serpens is expressed as 'Se1' for Serpens Caput and 'Se2' for Serpens Caudi
- MajAx: Major axis, expressed in arcmin
- MinAx: Minor axis, expressed in arcmin
- PosAng: Major axis position angle (North Eastwards)
- B-Mag: Apparent total magnitude in B filter
- V-Mag: Apparent total magnitude in V filter
- J-Mag: Apparent total magnitude in J filter
- H-Mag: Apparent total magnitude in H filter
- K-Mag: Apparent total magnitude in K filter
- SurfBr (only Galaxies): Mean surface brigthness within 25 mag isophot (B-band), expressed in mag/arcsec2
- Hubble (only Galaxies): Morphological type (for galaxies)
- Pax: Parallax, expressed in milliarcseconds
- Pm-RA: Proper motion in RA, expressed in milliarcseconds/year
- Pm-Dec: Proper motion in Dec, expressed in milliarcseconds/year
- RadVel: Radial velocity (heliocentric), expressed in km/s
- Redshift: Redshift (heliocentric)
- Cstar U-Mag (only Planetary Nebulae): Apparent magnitude of central star in U filter
- Cstar B-Mag (only Planetary Nebulae): Apparent magnitude of central star in B filter
- Cstar V-Mag (only Planetary Nebulae): Apparent magnitude of central star in V filter
- M: cross reference Messier number
- NGC: other NGC identification, if the object is listed twice in the catalog
- IC: cross reference IC number, if the object is also listed with that identification
- Cstar Names (only Planetary Nebulae): central star identifications
- Identifiers: cross reference with other catalogs
- Common names: Common names of the object if any
- NED Notes: notes about object exported from NED
- OpenNGC Notes: notes about the object data from OpenNGC catalog
- Sources: sources of data
1: NASA Extragalactic Database
2: SIMBAD Astronomical Database
3: HyperLeda
4: Harold Corwin's NGC/IC Positions and Notes
5: HEASARC mwsc table
6: HEASARC smcclustrs table
7: HEASARC lmcextobj table
8: HEASARC plnebulae table
9: HEASARC lbn table
10: HEASARC messier table
11: HEASARC lyngaclust table
99: OpenNGC revised data