CDS

2022A&A...659A..75L

Query : 2022A&A...659A..75L

2022A&A...659A..75L - Astronomy and Astrophysics, volume 659A, 75-75 (2022/3-1)

Evaluation of the ICRF stability from a position time series analysis.

LIU N., LAMBERT S.B., ARIAS E.F., LIU J.-C. and ZHU Z.

Abstract (from CDS):

Context. The celestial reference frame is established on the basis of the absolute positions of extragalactic sources that are assumed to be fixed in space. The fixing of the axes is one of the crucial points for the concept behind the International Celestial Reference System (ICRS). However, due to various effects such as its intrinsic activity, the apparent position of the extragalactic sources may vary with time, resulting in a time-dependent deviation of the frame axes that are defined by the positions of these sources. Aims. We aim to evaluate the axis stability of the third realization of the International Celestial Reference Frame (ICRF3). Methods. We first derived the extragalactic source position time series from observations of very long baseline interferometry (VLBI) at the dual S/X-band (2.3/8.4 GHz) between August 1979 and December 2020. We measured the stability of the ICRF3 axes in terms of the drift and scatter around the mean: (i) we estimated the global spin of the ICRF3 axes based on the apparent proper motion (slope of the position time series) of the defining sources of the ICRF3; (ii) we also constructed the yearly representations of the ICRF3 through annually averaged positions of the defining sources of the ICRF3 and estimated the dispersion in the axes orientation of these yearly frames. Results. The global spin is no higher than 0.8 µas yr–1 for each ICRF3 axis with an uncertainty of 0.3 µas yr–1, corresponding to an accumulated deformation smaller than 30 µas for the celestial frame axes during 1979.6-2021.0. The axes orientation of the yearly celestial frame becomes more stable as time elapses, with a standard deviation of 10 µas-20 µas for each axis. Conclusions. The axes of the ICRF3 are stable at approximately 10 µas-20 µas from 1979.6-2021.0 and the axes stability does not degrade after the adoption of the ICRF3.

Abstract Copyright: © ESO 2022

Journal keyword(s): reference systems - astrometry - techniques: interferometric - quasars: general - catalogs

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 7C 055201.39+394824.00 QSO 05 55 30.80561419 +39 48 49.1649683     18.30 17.5   ~ 498 2

Query : 2022A&A...659A..75L

Basic data :
7C 055201.39+394824.00 -- Quasar
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: 		Rad (2010AJ,7C,...), QSO (2005ApJ,QSO,...), Bla (2009A&A,[MGL2009],...), X (2009A&A,PBC,...), Bz? ([SRM2005]), G (OA), * (Gaia), 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) : 		05 55 30.80561419 +39 48 49.1649683 (Radio) [ 0.0301875 0.0304 0 ] A 2020A&A...644A.159C
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) : 		05 52 01.40674678 +39 48 21.9279171 [ 0.0301875 0.0304 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) : 		171.64723687388 +07.28455954810 [ 0.0301875 0.0304 0 ]
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 : 		0.008 -0.075 [0.109 0.076 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) 251270 [~] / z(spectroscopic) 2.37 [~] / cz 710508 [~]
   (Opt) D 2017ApJS..233....3T
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): 		0.0000123 0.0000095 -52 (Rad) D 2010AJ....139.1713C
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) :
V 18.30 [~] D 2010ApJ...710..764K
R 17.5 [~] E 2009A&A...495..691M
G 17.639700 [0.003269] C 2020yCat.1350....0G
J 16.06 [0.078] C 2003yCat.2246....0C
H 15.37 [0.094] C 2003yCat.2246....0C
K 14.68 [0.087] C 2003yCat.2246....0C
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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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:

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (55) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

7C 055201.39+394824.00 JVAS J0555+398 TXS 0552+398 [MML2015] 5BZQ J0555+3948
B2 0552+39 A JVAS B0552+398 VSOP J0555+3948 [P82] 0552+398
B2.3 0552+39 A 2MASS J05553080+3948491 WB 0552+3948 [SJS95] 0552+398
B3 0552+398 NEWPS5 J0555+3948 WMAP 100 [SRM2005] J055530.80+394849.1
BWE 0552+3948 NVSS J055530+394848 WMAP J0555+3944 [VV2000] J055530.8+394849
CLASS J055530.8057+394849.161 OA 00198 WMAP J0555+3942 [VV2003] J055530.8+394849
DA 193 OHIO A 198 WMAP J0555+3945 [VV2006] J055530.8+394849
GB6 J0555+3948 PBC J0555.9+3948 WMAP J0555+3947 [VV2010] J055530.8+394849
GB6 B0552+3948 QSO J0555+3948 WMAP J0555+3940 [VV96] J055530.8+394849
87GB 055202.2+394817 QSO B0552+398 WN B0552.0+3948 [VV98] J055530.8+394849
Gopal 0552+398 RORF 0552+398 [DSJ85] 0552+398 Gaia DR2 3458177821288511360
ICRF J055530.8+394849 SWIFT J0555.5+3946 [HB93] 0552+398 Gaia DR3 3458177821288511360
IERS B0552+398 TGSSADR J055530.8+394849 [MGL2009] BZU J0555+3948 Gaia DR1 3458177821288511360
IVS B0552+398 TIC 354221861 [MGL2009] BZQ J0555+3948

References (498 between 1850 and 2023) (Total 498)
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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Collections of Measurements


velocities : 4    PM : 3   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : 7C 055201.39+394824.00

Link by name to the catalogue in VizieR :

BWE 0552+3948 IERS B0552+398 2MASS J05553080+3948491 NVSS J055530+394848 VSOP J0555+3948
WMAP J0555+3944 WMAP J0555+3942 WMAP J0555+3945 WMAP J0555+3947 WMAP J0555+3940
WN B0552.0+3948 Gaia DR2 3458177821288511360 Gaia DR3 3458177821288511360 Gaia DR1 3458177821288511360

Search by coordinates in Vizier (radius: 5 arcsec)

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2023.09.23-06:47:01

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