Object Classes
1000 - X-ray binary
1100 - HMXRB 10 - X-ray pulsar 1 - flares
1200 - HMXRB supergiant 20 - burster 2 - jets
1300 - HMXRB Be star 30 - black hole 3 - eclipsing
1400 - LMXRB 40 - QPO 4 - ultra-soft transient
1500 - LMXRB Globular cluster 50 - QPO & black hole 5 - soft transient
60 - QPO & pulsar 6 - hard transient
70 - QPO & bursts 7 - eclipsing dipper
80 - QPO,pulsar,bursts 8 - eclipsing ADC
90 - pulsar & bursts 9 - dipper
1600 - CV 10 - Classical Nova 1 - oscillations
20 - Recurrent Nova 2 - coherent osc.
30 - AM Her (polar) 3 - fast
40 - Intermediate polar 4 - slow
50 - Dwarf nova 5 - eclipsing
60 - Dwarf nova U Gem type 6 -
70 - Dwarf Nova Z Cam type 7 -
80 - Dwarf Nova SU Uma type 8 -
90 - Nova like 9 -
1700 - Gamma ray 00 - source 1 - pulsar
10 - burst
20 - burst, soft repeater
1800 - Radio Pulsar
1810 - X-ray pulsator
1820 - Supersoft source
1830 - Isolated neutron star
1840 - Anomalous X-ray pulsar (AXP)
1850 - Extrasolar planet
1860 - Brown dwarf
1870 - Protostar of Type 0
1880 - Protostar of Type I
1890 - Luminous Blue Variable (LBV)
1900 - RS CVn star
1910 - Algol star
1920 - Beta Lyr star
1930 - W UMa star
1940 - Symbiotic star
1950 - Zeta Aurigae star
1960 - FK Comae star
1970 - UV Ceti type
1980 - T Tauri star 1 - (naked)
2 - (post)
1990 - Herbig Ae/Be star
1991 - Be star
2000 - Wolf Rayet 00 - unknown type 0 - spectral type unknown
10 - WN 1 ............... 1
20 - WC 2 ............... 2
30 - WO 3 ............... 3
4 ............... 4
5 ............... 5
6 ............... 6
7 ............... 7
8 ............... 8
9 ............... 9-11
00 - spectral type 0 0 .... luminosity class unknown
2100 - O 10................ 1 1 ..................... I or 0
2200 - B 20................ 2 2 ..................... II
2300 - A 30................ 3 3 ..................... III
2400 - F 40................ 4 4 ..................... IV
2500 - G 50................ 5 5 ..................... V
2600 - K 60................ 6 6 ..................... VI
2700 - M 70................ 7
2800 - Me 80................ 8
90................ 9
2900 - Star
10 - Luyten color class a
20 - Luyten color class a-f
30 - Luyten color class f
40 - Luyten color class f-g
50 - Luyten color class g
60 - Luyten color class g-k
70 - Luyten color class k
80 - Luyten color class k-m
90 - Luyten color class m
3000 - Extended galactic or extragalactic
3100 - SNR Crab-like 10 - Shell 1 - Radio Pulsar
3200 - SNR 20 - Filled-center 2 - Type I
3300 - Star forming region 30 - Composite 3 - Type II
3400 - Cloud 40 - Dark
3500 - Nebula 50 - Molecular
3600 - Open star cluster 60 - Planetary
3700 - OB association/HII region 70 - Reflection
3800 - Herbig-Haro object 80 - Globular Cluster
3900 - Diffuse X-ray emission
4000 - White dwarf 00 - 0 -
4100 - White dwarf DA 10 - A 1 - PNN
4200 - White dwarf DB 20 - B 2 - PNN detached binary
4300 - White dwarf DC 30 - C 3 - detached binary
4400 - White dwarf DO 40 - O 4 - O
4500 - White dwarf DZ 50 - Z 5 - Z
4600 - White dwarf DQ 60 - Q 6 - Q
4700 - White dwarf DX 70 - X 7 - X
4800 - White dwarf sD 80 - V 8 - P
4900 - White dwarf PG1159-type 90 - P 9 - H
5000 - Cluster of galaxies 10 - Abell class <0 1 - Cooling Flow
20 - Abell class 0
30 - Abell class 1
40 - Abell class 2
50 - Abell class >2
60 - non-Abell
5100 - Compact group of galaxies
5200 - Group of galaxies
5500 - X-ray background
6000 - Non-active galaxy
6100 - Dwarf Galaxy 10 - radio loud 1 - flat radio spectrum
6200 - Spiral galaxy 20 - HII region 2 - steep radio spectrum
6300 - Elliptical galaxy 30 - Multiple nuclei 3 - inverted radio spectrum
6400 - Starburst galaxy 40 - Barred
6500 - Interacting galaxy 50 - Unbarred
6600 - Irregular galaxy 60 - Mixed
6700 - Galaxy 70 - Nebulous region
6800 - Lenticular galaxy
6900 - Normal galaxy
7000 - AGN Unclassified
7100 - Seyfert 10 - radio loud 1 - flat radio spectrum
7200 - QSO 20 - radio loud/polarized 2 - steep radio spectrum
7300 - BL Lac 30 - radio quiet 3 - inverted radio spect
7400 - Liner 40 - radio loud/invert sp 4 - type 1
7500 - Radio Galaxy 50 - radio loud/flat sp 5 - type 1.5
7600 - IR Galaxy 60 - radio loud/steep sp 6 - type 2
7700 - OVV 70 - radio pol/invert sp
80 - radio pol/flat sp
90 - radio pol/steep sp
7800 - NEL (Narrow Emission-Line) galaxy
7900 - NLS1 (Narrow-Line Seyfert 1) galaxy
8000 - Solar system object
8100 - Planet 10 - Mercury
20 - Venus
30 - Earth
40 - Mars
50 - Jupiter
60 - Saturn
70 - Uranus
80 - Neptune
90 - Pluto
8200 - Solar Feature 10 - Quiet Sun
20 - Active Sun
30 - Sunspot
40 - Plage/Active Region
50 - North Pole
60 - South Pole
70 - Equatorial Region
80 - Mid-Latitude Region
90 - Flare
8300 - Asteroid 10 - Main Belt Object
20 - Centaur
30 - Kuiper Belt Object
40 - Near-Earth
8400 - Comet 10 - Periodic
20 - Non-Periodic
30 - Sun-Grazing
8500 - Moon
9000 - Unusual object
9100 - Supernova 10 - Type I
20 - Type II
9200 - Hypernova
9300 - Ultra-Luminous X-Ray Source (ULX)
9400 - Supermassive Black Hole
9999 - unidentified