# SGR 1806-20

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 Query : SGR 1806-20

Basic data :
 PSR J1808-2024 -- Pulsar 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: X (AX,CXOU,...), gB (GBS,GRB,...), Psr (2012ApJ,PSR), gam (INTEGRAL1,INTREF), Rad (MITG), IR ([FMC99]) 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] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue), 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) : 18 08 39.32 -20 24 40.1 (X-ray) [ 100 100 90 ] C 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] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue), 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) : 18 05 40.68 -20 25 11.4 [ 100 100 90 ] 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] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue), 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) : 009.99584 -00.24194 [ 100 100 90 ]
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay points in this preview
 All (CDSPortal) Send to within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR. 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!).
 Some important notes on this object about identifications and objects associations. notes: has a luminous very massive companion : NAME LBV 1806-20

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

 : 1 : 1 Display criteria : All >=90% stars galaxies radio IR <2 arcsec #ref>50

 The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature. Identifiers (24) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

 PSR J1808-2024 GRB 041227 KONUS 07.01.79 SWIFT J1808.6-2024 AX 1805.7-2025 HETE Trigger 3800 MITG J1808-2024 2XMM J180839.2-202439 CXOU J180839.3-202439 HETE Trigger 3801 NAME Sgr 1806-20 [ABH87] 25 GBS 1806-20 HETE Trigger 1566 PBC J1808.5-2025 [FMC99] O GRB 970912 INTEGRAL1 84 RX J1808.6-2024 [KRL2007b] 305 GRB 790107 INTREF 882 SWIFT J1808.7-2024 EQ 1805.7-2025

 References (1191 between 1850 and 2023) (Total 1191) Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system). Follow new references on this object
Reference summaries :

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Collections of Measurements

distance : 1

Observing logs

ISO : 11    XMM : 5

External archives :

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 Indications mainly about references on other documents Notes (1) :

• NAME LBV 1806-20 is the named assigned to the very massive star discovered by van Kerkwijk, Kulkarni et al. in their 1995ApJ...444L..33V paper A luminous companion to SGR 1806-20. It is a candidate to the most massive star known (M(init) about 200 solar masses, and a luminosity estimated to $10^6$ solar).

The relation between the Soft-gamma Repeater SGR 1806-20 and the massive star LBV 1806-20 is not clear (they seem to be 12" apart), but both sources are associated to the giant HII complex W 31. It seems that the very strong wind from LBV 1806-20 is powering the nebula SNR 10.0-0.3, and that LBV 1806-20 and SGR 1806-20 are two members of the cluster [BDB2003] G010.00-00.24. An interesting map of the region is presented as Fig.1 of the summary paper by Corbel and Eikenberry (2004A&A...419..191C)

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