GJ 806

Query : GJ 806
C.D.S. - SIMBAD4 rel 1.7 - 2018.11.19CET13:25:06

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
BD+44 3567 -- High proper-motion Star
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (AC,ASCC,...), PM* (Ref,LHS,...), IR (2MASS,WISEA), ** (CCDM), V* (NSV)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
20 45 04.0991768849 +44 29 56.643391465 (Optical) [ 0.0244 0.0296 90 ] A 2018yCat.1345....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
20 43 17.6409168452 +44 18 45.094309988 [ 2.9502 2.3501 0 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : coordinates error major axis, minor axis (in mas at defined epoch and convolved with error on propermotion),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
084.0680662260693 +01.0084714167608 [ 0.0296 0.0244 84 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
434.079 271.143 [0.047 0.059 90] A 2018yCat.1345....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) -24.70 [0.1] / z(~) -0.000082 [0.000000] / cz -24.70 [0.10]
   A 2002ApJS..141..503N
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
82.9968 [0.0296] A 2018yCat.1345....0G
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
M2V B 1991ApJS...77..417K
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (11) :
B 12.03 [0.15] D 2000A&A...355L..27H
V 10.704 [0.01] D 2012yCat.1322....0Z
R 10.299 [0.01] D 2012yCat.1322....0Z
I 8.57 [~] D 2004AJ....128..463R
G 9.8246 [0.0008] C 2018yCat.1345....0G
J 7.329 [0.018] C 2003yCat.2246....0C
H 6.769 [0.023] C 2003yCat.2246....0C
K 6.533 [0.016] C 2003yCat.2246....0C
g 11.610 [0.01] D 2012yCat.1322....0Z
r 10.137 [0.01] D 2012yCat.1322....0Z
i 9.127 [0.01] D 2012yCat.1322....0Z
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The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (34) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

LHS 3577 G 209-41 NLTT 49843 USNO 897
AC +44 871 GJ 806 NSV 13280 WEB 18540
ASCC 436187 HIC 102401 PLX 4951 WISEA J204504.52+442959.4
BD+44 3567 HIP 102401 PLX 4951.00 [RHG95] 3247
CCDM J20451+4430A JP11 5177 PM J20450+4429 Gaia DR2 2070115588901082368
Ci 20 1228 LFT 1568 TYC 3178-633-1 Gaia DR1 2070115584598613632
CSI+44-20433 LSPM J2045+4429 UCAC2 46961244 p. Pulk 40
GCRV 13011 LTT 16068 UCAC4 673-089122
GEN# +6.10010806 2MASS J20450403+4429562 USNO-B1.0 1344-00401190

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References (104 between 1850 and 2019) (Total 104)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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                Reference summaries :

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Collections of Measurements


distance : 1    diameter : 1    velocities : 5    ROT : 1    PM : 8    Fe_H : 6    PLX : 5    MK : 4   

   


External archives :

Link by name to the catalogue in VizieR :

LHS 3577 BD+44 3567 CCDM J20451+4430A G 209-41 GJ 806
HIC 102401 HIP 102401 LSPM J2045+4429 2MASS J20450403+4429562 NLTT 49843
NSV 13280 PLX 4951 TYC 3178-633-1 UCAC2 46961244 UCAC4 673-089122
USNO-B1.0 1344-00401190 WISEA J204504.52+442959.4 Gaia DR2 2070115588901082368 Gaia DR1 2070115584598613632

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2018.11.19-13:25:06

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