CDS

NGC 6921

Query : NGC 6921

Basic data :
NGC 6921 -- Seyfert 2 Galaxy
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: 		G (2015ApJS,LEDA,...), * (2003AJ,USNO,...), X (NuSTAR,SWIFT), Rad (GB6,87GB), IR (IRAS,PSCz), Sy2 (2008ApJ), AGN (2017ApJ), GiG ([WGB2006]), AG? (2020MNRAS), PM* (2003AJ), NIR (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) : 		20 28 28.8658027224 +25 43 24.094324884 (Optical) [ 1.9742 2.7573 90 ] C 2020yCat.1350....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] : 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) : 		20 28 28.8674820583 +25 43 24.115684316 [ 1.9742 2.7573 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) : 		20 26 20.7463050474 +25 33 23.025792904 [ 1.9742 2.7573 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) : 		066.9832843689999 -07.5585428241651 [ 1.9742 2.7573 90 ]
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) 4531 [22] / z(spectroscopic) 0.01523 [0.00007] / cz 4566.0 [22.0]
   C 2006AJ....132..197W
Syntax of morphological type is : mtype quality bibcode
  • mtype : Hubble morphological class (spirals, ellipticals, etc)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the morphological type reference
Morphological type: 		S D ~
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin): 		1.090 0.436 140 (NIR) C 2006AJ....131.1163S
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 (6) :
U 15.41 [0.01] D 2009A&A...494..417R
V 12.897 [0.007] D 2009A&A...494..417R
G 18.200279 [0.043541] C 2020yCat.1350....0G
J 10.012 [0.015] C 2006AJ....131.1163S
H 9.180 [0.019] C 2006AJ....131.1163S
K 8.836 [0.016] C 2006AJ....131.1163S
SIMBAD within arcmin
', {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 Simbad points in this preview
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sedIcon
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!). sed-help-icon
Some important notes on this object about identifications and objects associations.
notes:

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

: 2 : 1 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (20) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NGC 6921 LEDA 64768 PSCz Q20264+2533 UZC J202828.8+254324
GB6 B2026+2533 2MASS J20282888+2543244 SWIFT J202828.7+254322 Z 2026.4+2533
87GB 202621.8+253300 2MASX J20282884+2543241 TIC 436329753 [VDD93] 228
IRAS 2026+255P15 MCG+04-48-001 UGC 11570 [WGB2006] 202624+25330 a
IRAS 20264+2533 NuSTAR J202828+2543.4 USNO-B1.0 1157-00462166 Gaia DR3 1832568055929553664

References (17 between 2019 and 2024) (Total 93)
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


velocities : 9   

   

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)

velocities (9) 

 |typ|    Value    R   m.e.  |A (Nmes)|na,Q,dom ,   res    D| Obs.date | Rem.  |Or|     Reference     |
 ------------------------------------------------------------------------------------------------------
 |cz | 4313          15      |C (    )|s , ,Opt ,           |          |       |  |2022ApJS..261....6K|
Observing logs


herschel : 5   

   

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)

herschel (5)

The 1 column in color are computed by VizieR, and are not part of the original data.

Note: (see also the postcard server)

VI/139/herschel
Post annotation 		Herschel Observation Log (Herschel Science Centre, 2013) [ReadMe+ftp]
2013yCat.6139....0H

The Herschel Observation Log (37093 rows)		img(gal)
start AladinLite 
 Full      _r     OD   Target                                 RAJ2000      DEJ2000    Proposal           AOT                 Dur          Start            ObsId       PACS        HIFI        SPIRE    Label                                                                                                                 
        arcmin                                               "h:m:s"      "d:m:s"                                            s             s                                                                                                                                                                                 


    1   0.7642  1065  MCG+04-48-002                        20 28 31.98  +25 43 42.3  OT1_dsanders_1     PacsPhoto            198  2012-04-12T23:47:46  1342244231  get Herschel/PACS observation #1342244231                           PPhoto-Blue_2 -MCG+04-48-002                                                                                          
    2   0.7642  1065  MCG+04-48-002                        20 28 31.98  +25 43 42.3  OT1_dsanders_1     PacsPhoto            198  2012-04-12T23:43:25  1342244230  get Herschel/PACS observation #1342244230                           PPhoto_Blue -MCG+04-48-002                                                                                            
    3   0.7642  1065  MCG+04-48-002                        20 28 31.98  +25 43 42.3  OT1_dsanders_1     PacsPhoto            198  2012-04-12T23:39:04  1342244229  get Herschel/PACS observation #1342244229                           PPhoto-Green_2 -MCG+04-48-002                                                                                         
    4   0.7642  1065  MCG+04-48-002                        20 28 31.98  +25 43 42.3  OT1_dsanders_1     PacsPhoto            198  2012-04-12T23:34:43  1342244228  get Herschel/PACS observation #1342244228                           PPhoto_Green -MCG+04-48-002                                                                                           
    5   0.7642   931  MCG+04-48-002                        20 28 31.98  +25 43 42.3  OT1_dsanders_1     SpirePhoto           169  2011-11-30T15:10:01  1342233320                          get Herschel/SPIRE observation #1342233320   SPhoto -MCG+04-48-002

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NGC 6921

Link by name to the catalogue in VizieR :

NGC 6921 IRAS 2026+255P15 IRAS 20264+2533 2MASS J20282888+2543244 2MASX J20282884+2543241
UGC 11570 USNO-B1.0 1157-00462166 Gaia DR3 1832568055929553664

Search by coordinates in Vizier (radius: 30 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

Currently no annotations available

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report an error concerning the data of this object

2023.11.29-08:45:33

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