H 1821+643

Query : H 1821+643

Basic data :
7C 1821+6419 -- Seyfert 1 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: 		X (2012ApJS,1AXG,...), QSO (2013ApJS,KODIAQ,...), G (2012A&A,[SLK2004]), UV (KUV,PG,...), MIR (AKARI,WISEA,...), IR (IRAS,ISOSS,...), gam (IGR,INTREF), Rad (7C,8C), Sy1 (2012MNRAS), AGN (2010A&A), * (Gaia), Opt (SDSS)
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 21 57.2130271440 +64 20 36.221312076 (Optical) [ 0.0129 0.0140 90 ] A 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
FK4 coord. (ep=B1950 eq=1950) : 		18 21 41.7952404312 +64 19 00.893856147 [ 0.0129 0.0140 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) : 		094.0024993850374 +27.4170503584680 [ 0.0129 0.0140 90 ]
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 : 		-0.006 0.004 [0.017 0.019 90] A 2020yCat.1350....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) 76251 [90] / z(emission) 0.2970 [0.0003] / cz 89038 [90]
   C 2013MNRAS.435.1233G
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 (8) :
B 14.23 [~] D 2010A&A...518A..10V
V 14.24 [~] D 2010A&A...518A..10V
G 13.882390 [0.002976] C 2020yCat.1350....0G
u (AB) 14.422 [0.005] C 2020ApJS..249....3A
g (AB) 13.996 [0.004] C 2020ApJS..249....3A
r (AB) 13.824 [0.003] C 2020ApJS..249....3A
i (AB) 15.187 [0.012] D 2020ApJS..249....3A
z (AB) 13.609 [0.005] C 2020ApJS..249....3A
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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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 ) :

: 1 : 186 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (56) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

7C 1821+6419 IGR J18218+6421 QSO B1821+64 WISE J182157.22+642036.2
AKARI-FIS-V1 J1821561+642039 INTREF 900 QSO B1821+643 2XMMi J182157.2+642036
AKARI-IRC-V1 J1821571+642036 IRAS 18216+6418 QSO J1821+6420 XSS J18196+6454
1AXG J182200+6420 IRAS F18216+6419 QSO B1821+642 [BAG2012] 275.5807+64.3694
7C 182140.90+641929.00 IRAS F18216+6419A RX J182155+64207 [BDW2002] q1821+6419
8C 1821+643A IRAS 18216+6419 RX J1821.9+6420 [HB93] 1821+643
1E 1821+64.3 ISOSS J18218+6421 RX J1821.8+6419 [SLK2004] 1455
2E 4066 KODIAQ J182157+642036 1RXS J182157.4+642051 [VV2000] J182157.2+642036
2E 1821.6+6419 KUV 18217+6419 SDSS J182157.23+642036.1 [VV2003] J182157.2+642036
1ES 1821+64.3 PBC J1821.5+6421 SWIFT J1822.0+6421 [VV2006] J182157.2+642036
EXO 1821.6+6419 PG 1821+643 SWIFT J1822.1+6421 [VV2010] J182157.2+642036
1H 1820+643 PSCz P18216+6418 SWIFT J1822.2+6420 [VV96] J182157.3+642036
H 1824+644 QSO J1822+6420 UVQS J182157.22+642036.2 [VV98] J182157.2+642036
H 1821+643 QSO B1821+6419 WISEA J182157.22+642036.2 Gaia DR3 2160562892865099392

References (601 between 1850 and 2024) (Total 601)
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 :

                from: to:

                 or select by : (not exhaustive, explanation here)

Collections of Measurements


velocities : 11    PM : 1   

   

Observing logs


herschel : 5    ISO : 11    IUE : 23    XMM : 1   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : H 1821+643

Link by name to the catalogue in VizieR :

AKARI-FIS-V1 J1821561+642039 AKARI-IRC-V1 J1821571+642036 2E 4066 IRAS 18216+6418 IRAS F18216+6419
IRAS F18216+6419A IRAS 18216+6419 PG 1821+643 1RXS J182157.4+642051 SDSS J182157.23+642036.1
WISEA J182157.22+642036.2 WISE J182157.22+642036.2 Gaia DR3 2160562892865099392

Search by coordinates in Vizier (radius: 5 arcsec)

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