# LBV 1806-20

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 Query : LBV 1806-20

Basic data :
[KMN95] Star A -- Blue Supergiant
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:
* ([EML2004],[KMN95]), s*b (2005ApJ), IR (2MASS)
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 40.312 -20 24 41.14 (Near-IR) [ 60 60 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
FK5 coord. (ep=J2000 eq=2000) :
18 08 40.314 -20 24 41.12 [ 60 60 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
FK4 coord. (ep=B1950 eq=1950) :
18 05 41.671 -20 25 12.54 [ 60 60 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) :
009.997460 -00.245450 [ 60 60 90 ]
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:
LBV C
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 (3) :
 J 13.66 [0.03] C H 10.480 [0.026] C K 8.742 [0.021] C
', {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: luminous very massive companion to SGR 1806-20 The fuzzy object [KMN95] HK has two parts East and West [KMN95] K and [KMN95] H.

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 (6) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

 2MASS J18084031-2024411 TIC 176241011 [KMN95] Star A NAME LBV 1806-20 [EML2004] Star A [KMN95] H

 References (4 between 2018 and 2023) (Total 41) 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 :

from: to:

or select by : (not exhaustive, explanation here)

Collections of Measurements

MK : 2

Warning : measurements from IRAS, IRC, SAO, CL.g (ACO), GJ have been removed
(they are still available using the icon Vizier near the identifier of the catalogue, or at the bottom of the page in the section "External links" to get the full data)

mk (2)

 |ds/mss|           Spectral type            |     reference     |
-----------------------------------------------------------------
|  /   |LBV                                 |2005ApJ...622L..49F|


External archives :

Link by name to the catalogue in VizieR :

Search by coordinates in Vizier (radius: 5 arcsec)

 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)

Annotations :
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Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

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2022.11.28-17:33:10