H1821+643

Query : H1821+643
C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST10:25:23

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


Basic data :
2E 4066 -- 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 (Ref,2E,...), QSO (Ref,KODIAQ,...), IR (AKARI,IRAS,...), UV (KUV,PG,...), Rad (7C,8C), gam (IGR,INTREF), Sy1 (Ref), AGN (Ref), G ([SLK2004])
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 57.2365 +64 20 36.226 [ 119.9 67.4 0 ] C 2009A&A...505..385A
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 41.8181 +64 19 00.875 [ 119.9 67.4 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] : 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) :
094.0025012 +27.4170072 [ 119.9 67.4 0 ]
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 (2) :
B 14.23 [~] D 2010A&A...518A..10V
V 14.24 [~] D 2010A&A...518A..10V
SIMBAD with radius arcmin
Interactive AladinLite view
Back
sedIcon
VizieR photometry viewer    sed-help-icon
within radius 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:


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

: 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 (52) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

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

Plots and Images

plot

radius arcmin


CDS portal

CDS Simplay
(requires flash)

Aladin applet

References (534 between 1850 and 2020) (Total 534)
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 : 6   

   

Observing logs


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

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : H1821+643

Link by name to the catalogue in VizieR :

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

Search by coordinates in Vizier (radius: 5 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

add an annotation to this object

report an error concerning the data of this object




Store this result in Votable, in Ascii, or in the CDS portal

To bookmark this query, right click on this link: simbad:H1821+643 and select 'bookmark this link' or equivalent in the popup menu


2020.07.05-10:25:23

© Université de Strasbourg/CNRS

    • Contact