SIMBAD: Object types in SIMBAD


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|In a few months the historical list of object types below will be replaced by a reorganized list, based on physical properties, and on the evolutionary stage for stars. It will enable a more interactive search, and will provide minimal definitions. The hierarchies between object types will evolve: for instance, a RR Lyrae Star will still be in the hierarchy of Variable Stars, and also in the hierarchy of Horizontal Branch Stars. 
If you are using the hierarchies in scripts, you might have to adapt your scripts to the new description.


The Object Type in Simbad is defined as a hierarchical classification, which emphasizes the physical nature of the object rather than a peculiar emission in some region of the electromagnetic spectrum or the location in peculiar clusters or external galaxies. Therefore objects are classified as peculiar emitters (Radio, IR, Red, Blue, UV, X or gamma) only if nothing more about the nature of the object is known, i.e. it cannot be decided whether the object is a star, a multiple system, a nebula or a galaxy.

Each class has normally a standard designation, a condensed one (used in tables) and an extended explanation.

Object classification in SIMBAD

(Last classification version : 04-Oct-2021)

Standard name Cond. Extended explanation
Unknown     ?      Object of unknown nature    
  ·  Transient     ev      transient event    
 
Radio     Rad     Radio-source    
  ·  Radio(m)     mR      metric Radio-source    
  ·  Radio(cm)     cm      centimetric Radio-source    
  ·  Radio(mm)     mm      millimetric Radio-source    
  ·  Radio(sub-mm)     smm     sub-millimetric source    
  ·  HI     HI      HI (21cm) source    
  ·  radioBurst     rB      radio Burst    
  ·  Maser     Mas     Maser    
 
IR     IR      Infra-Red source    
  ·  FIR     FIR     Far-Infrared source    
  ·  MIR     MIR     Mid-Infrared source    
  ·  NIR     NIR     Near-Infrared source    
 
Blue     blu     Blue object    
 
UV     UV      UV-emission source    
 
X     X      X-ray source    
  ·  ULX?     UX?     Ultra-luminous X-ray candidate    
  ·  ULX     ULX     Ultra-luminous X-ray source    
 
gamma     gam     gamma-ray source    
  ·  gammaBurst     gB      gamma-ray Burst    
 
Inexistent     err     Not an object (error, artefact, ...)    
 
Gravitation     grv     Gravitational Source    
  ·  LensingEv     Lev     (Micro)Lensing Event    
  ·  Candidate_LensSystem     LS?     Possible gravitational lens System    
  ·  Candidate_Lens     Le?     Possible gravitational lens    
  ·  Possible_lensImage     LI?     Possible gravitationally lensed image    
  ·  GravLens     gLe     Gravitational Lens    
  ·  GravLensSystem     gLS     Gravitational Lens System (lens+images)    
  ·  GravWaveEvent     GWE     Gravitational Wave Event    
 
Candidates     ..?     Candidate objects    
  ·  Possible_G     G?      Possible Galaxy    
  ·  Possible_SClG     SC?     Possible Supercluster of Galaxies    
  ·  Possible_ClG     C?G     Possible Cluster of Galaxies    
  ·  Possible_GrG     Gr?     Possible Group of Galaxies    
  ·  Possible_As*     As?         
  ·  Candidate_**     **?     Physical Binary Candidate    
  ·  ·  Candidate_EB*     EB?     Eclipsing Binary Candidate    
  ·  ·  Candidate_Symb*     Sy?     Symbiotic Star Candidate    
  ·  ·  Candidate_CV*     CV?     Cataclysmic Binary Candidate    
  ·  ·  ·  Candidate_Nova     No?     Nova Candidate    
  ·  ·  Candidate_XB*     XB?     X-ray binary Candidate    
  ·  ·  ·  Candidate_LMXB     LX?     Low-Mass X-ray binary Candidate    
  ·  ·  ·  Candidate_HMXB     HX?     High-Mass X-ray binary Candidate    
  ·  Candidate_Pec*     Pec?     Possible Peculiar Star    
  ·  ·  Candidate_YSO     Y*?     Young Stellar Object Candidate    
  ·  ·  ·  Candidate_TTau*     TT?     T Tau star Candidate    
  ·  ·  Candidate_C*     C*?     Possible Carbon Star    
  ·  ·  Candidate_S*     S*?     Possible S Star    
  ·  ·  Candidate_OH     OH?     Possible Star with envelope of OH/IR type    
  ·  ·  Candidate_WR*     WR?     Possible Wolf-Rayet Star    
  ·  ·  Candidate_Be*     Be?     Possible Be Star    
  ·  ·  Candidate_Ae*     Ae?     Possible Herbig Ae/Be Star    
  ·  ·  Candidate_HB*     HB?     Possible Horizontal Branch Star    
  ·  ·  ·  Candidate_RRLyr     RR?     Possible Star of RR Lyr type    
  ·  ·  ·  Candidate_Cepheid     Ce?     Possible Cepheid    
  ·  ·  ·  Candidate_PulsV*WVir     WV?     Possible Variable Star of W Vir type    
  ·  ·  Candidate_RGB*     RB?     Possible Red Giant Branch star    
  ·  ·  Candidate_SG*     sg?     Possible Supergiant star    
  ·  ·  ·  Candidate_RSG*     s?r     Possible Red supergiant star    
  ·  ·  ·  Candidate_YSG*     s?y     Possible Yellow supergiant star    
  ·  ·  ·  Candidate_BSG*     s?b     Possible Blue supergiant star    
  ·  ·  Candidate_AGB*     AB?     Asymptotic Giant Branch Star candidate    
  ·  ·  ·  Candidate_LP*     LP?     Long Period Variable candidate    
  ·  ·  ·  Candidate_Mi*     Mi?     Mira candidate    
  ·  ·  Candidate_post-AGB*     pA?     Post-AGB Star Candidate    
  ·  ·  Candidate_BSS     BS?     Candidate blue Straggler Star    
  ·  ·  Candidate_Hsd     HS?     Hot subdwarf candidate    
  ·  ·  Candidate_WD*     WD?     White Dwarf Candidate    
  ·  ·  Candidate_NS     N*?     Neutron Star Candidate    
  ·  ·  Candidate_BH     BH?     Black Hole Candidate    
  ·  ·  Candidate_SN*     SN?     SuperNova Candidate    
  ·  ·  Candidate_low-mass*     LM?     Low-mass star candidate    
  ·  ·  Candidate_brownD*     BD?     Brown Dwarf Candidate    
 
multiple_object     mul     Composite object    
  ·  Region     reg     Region defined in the sky    
  ·  ·  Void     vid     Underdense region of the Universe    
  ·  SuperClG     SCG     Supercluster of Galaxies    
  ·  ClG     ClG     Cluster of Galaxies    
  ·  GroupG     GrG     Group of Galaxies    
  ·  ·  Compact_Gr_G     CGG     Compact Group of Galaxies    
  ·  PairG     PaG     Pair of Galaxies    
  ·  ·  IG     IG      Interacting Galaxies    
  ·  Cl*?     C?*     Possible (open) star cluster    
  ·  GlCl?     Gl?     Possible Globular Cluster    
  ·  Cl*     Cl*     Cluster of Stars    
  ·  ·  GlCl     GlC     Globular Cluster    
  ·  ·  OpCl     OpC     Open (galactic) Cluster    
  ·  Assoc*     As*     Association of Stars    
  ·  ·  Stream*     St*     Stellar Stream    
  ·  ·  MouvGroup     MGr     Moving Group    
  ·  **     **      Double or multiple star    
  ·  ·  EB*     EB*     Eclipsing binary    
  ·  ·  SB*     SB*     Spectroscopic binary    
  ·  ·  EllipVar     El*     Ellipsoidal variable Star    
  ·  ·  Symbiotic*     Sy*     Symbiotic Star    
  ·  ·  CataclyV*     CV*     Cataclysmic Variable Star    
  ·  ·  ·  Nova     No*     Nova    
  ·  ·  XB     XB*     X-ray Binary    
  ·  ·  ·  LMXB     LXB     Low Mass X-ray Binary    
  ·  ·  ·  HMXB     HXB     High Mass X-ray Binary    
 
ISM     ISM     Interstellar matter    
  ·  PartofCloud     PoC     Part of Cloud    
  ·  PN?     PN?     Possible Planetary Nebula    
  ·  ComGlob     CGb     Cometary Globule    
  ·  Bubble     bub     Bubble    
  ·  EmObj     EmO     Emission Object    
  ·  Cloud     Cld     Cloud    
  ·  ·  GalNeb     GNe     Galactic Nebula    
  ·  ·  DkNeb     DNe     Dark Cloud (nebula)    
  ·  ·  RfNeb     RNe     Reflection Nebula    
  ·  ·  MolCld     MoC     Molecular Cloud    
  ·  ·  ·  Globule     glb     Globule (low-mass dark cloud)    
  ·  ·  ·  denseCore     cor     Dense core    
  ·  ·  ·  SFregion     SFR     Star forming region    
  ·  ·  HVCld     HVC     High-velocity Cloud    
  ·  HII     HII     HII (ionized) region    
  ·  PN     PN      Planetary Nebula    
  ·  HIshell     sh      HI shell    
  ·  SNR?     SR?     SuperNova Remnant Candidate    
  ·  SNR     SNR     SuperNova Remnant    
  ·  ·  outflow?     of?     Outflow candidate    
  ·  ·  Outflow     out     Outflow    
  ·  ·  HH     HH      Herbig-Haro Object    
 
Star     *      Star    
  ·  V*?     V*?     Star suspected of Variability    
  ·  Pec*     Pe*     Peculiar Star    
  ·  ·  HB*     HB*     Horizontal Branch Star    
  ·  ·  YSO     Y*O     Young Stellar Object    
  ·  ·  ·  Ae*     Ae*     Herbig Ae/Be star    
  ·  ·  Em*     Em*     Emission-line Star    
  ·  ·  ·  Be*     Be*     Be Star    
  ·  ·  BlueStraggler     BS*     Blue Straggler Star    
  ·  ·  RGB*     RG*     Red Giant Branch star    
  ·  ·  AGB*     AB*     Asymptotic Giant Branch Star (He-burning)    
  ·  ·  ·  C*     C*      Carbon Star    
  ·  ·  ·  S*     S*      S Star    
  ·  ·  SG*     sg*     Evolved supergiant star    
  ·  ·  ·  RedSG*     s*r     Red supergiant star    
  ·  ·  ·  YellowSG*     s*y     Yellow supergiant star    
  ·  ·  ·  BlueSG*     s*b     Blue supergiant star    
  ·  ·  HotSubdwarf     HS*     Hot subdwarf    
  ·  ·  post-AGB*     pA*     Post-AGB Star (proto-PN)    
  ·  ·  WD*     WD*     White Dwarf    
  ·  ·  low-mass*     LM*     Low-mass star (M<1solMass)    
  ·  ·  brownD*     BD*     Brown Dwarf (M<0.08solMass)    
  ·  ·  Neutron*     N*      Confirmed Neutron Star    
  ·  ·  OH/IR     OH*     OH/IR star    
  ·  ·  ·  TTau*     TT*     T Tau-type Star    
  ·  ·  WR*     WR*     Wolf-Rayet Star    
  ·  PM*     PM*     High proper-motion Star    
  ·  HV*     HV*     High-velocity Star    
  ·  V*     V*      Variable Star    
  ·  ·  Irregular_V*     Ir*     Variable Star of irregular type    
  ·  ·  ·  Orion_V*     Or*     Variable Star of Orion Type    
  ·  ·  Eruptive*     Er*     Eruptive variable Star    
  ·  ·  ·  Erupt*RCrB     RC*     Variable Star of R CrB type    
  ·  ·  ·  RCrB_Candidate     RC?     Variable Star of R CrB type candiate    
  ·  ·  RotV*     Ro*     Rotationally variable Star    
  ·  ·  ·  RotV*alf2CVn     a2*     Variable Star of alpha2 CVn type    
  ·  ·  ·  Pulsar     Psr     Pulsar    
  ·  ·  ·  BYDra     BY*     Variable of BY Dra type    
  ·  ·  ·  RSCVn     RS*     Variable of RS CVn type    
  ·  ·  PulsV*     Pu*     Pulsating variable Star    
  ·  ·  ·  RRLyr     RR*     Variable Star of RR Lyr type    
  ·  ·  ·  Cepheid     Ce*     Cepheid variable Star    
  ·  ·  ·  PulsV*delSct     dS*     Variable Star of delta Sct type    
  ·  ·  ·  PulsV*RVTau     RV*     Variable Star of RV Tau type    
  ·  ·  ·  PulsV*WVir     WV*     Variable Star of W Vir type    
  ·  ·  ·  PulsV*bCep     bC*     Variable Star of beta Cep type    
  ·  ·  ·  deltaCep     cC*     Classical Cepheid (delta Cep type)    
  ·  ·  ·  gammaDor     gD*     Variable Star of gamma Dor type    
  ·  ·  ·  pulsV*SX     SX*     Variable Star of SX Phe type (subdwarf)    
  ·  ·  LPV*     LP*     Long-period variable star    
  ·  ·  ·  Mira     Mi*     Variable Star of Mira Cet type    
  ·  ·  SN     SN*     SuperNova    
  ·  Sub-stellar     su*     Sub-stellar object    
  ·  ·  Planet?     Pl?     Extra-solar Planet Candidate    
  ·  ·  Planet     Pl      Extra-solar Confirmed Planet    
 
Galaxy     G      Galaxy    
  ·  PartofG     PoG     Part of a Galaxy    
  ·  GinCl     GiC     Galaxy in Cluster of Galaxies    
  ·  ·  BClG     BiC     Brightest galaxy in a Cluster (BCG)    
  ·  GinGroup     GiG     Galaxy in Group of Galaxies    
  ·  GinPair     GiP     Galaxy in Pair of Galaxies    
  ·  RadioG     rG      Radio Galaxy    
  ·  HII_G     H2G     HII Galaxy    
  ·  LSB_G     LSB     Low Surface Brightness Galaxy    
  ·  AGN_Candidate     AG?     Possible Active Galaxy Nucleus    
  ·  ·  QSO_Candidate     Q?      Possible Quasar    
  ·  ·  Blazar_Candidate     Bz?     Possible Blazar    
  ·  ·  BLLac_Candidate     BL?     Possible BL Lac    
  ·  EmG     EmG     Emission-line galaxy    
  ·  StarburstG     SBG     Starburst Galaxy    
  ·  BlueCompG     bCG     Blue compact Galaxy    
  ·  LensedImage     LeI     Gravitationally Lensed Image    
  ·  ·  LensedG     LeG     Gravitationally Lensed Image of a Galaxy    
  ·  ·  LensedQ     LeQ     Gravitationally Lensed Image of a Quasar    
  ·  AGN     AGN     Active Galaxy Nucleus    
  ·  ·  LINER     LIN     LINER-type Active Galaxy Nucleus    
  ·  ·  Seyfert     SyG     Seyfert Galaxy    
  ·  ·  ·  Seyfert_1     Sy1     Seyfert 1 Galaxy    
  ·  ·  ·  Seyfert_2     Sy2     Seyfert 2 Galaxy    
  ·  ·  Blazar     Bla     Blazar    
  ·  ·  ·  BLLac     BLL     BL Lac - type object    
  ·  ·  ·  OVV     OVV     Optically Violently Variable object    
  ·  ·  QSO     QSO     Quasar    



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