WD 1554+094

Basic data :
GALEX J155720.8+091625 -- White Dwarf 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: WD* (2006ApJS,WD), WD? (2019MNRAS), * (Gaia), UV (GALEX), 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''; as well as Tycho2, UCAC4, and Gaia DR2/3 without proper motions B : 0.01-0.1''; as well as Tycho2 and UCAC4 with proper motions A : Hipparcos and Gaia DR2/3 with proper motions; sometimes VLBI bibcode : bibcode of the coordinates reference ICRS coord. (ep=J2000) : 15 57 20.7787057920 +09 16 24.781916856 (Optical) [ 0.1562 0.1710 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''; as well as Tycho2, UCAC4, and Gaia DR2/3 without proper motions B : 0.01-0.1''; as well as Tycho2 and UCAC4 with proper motions A : Hipparcos and Gaia DR2/3 with proper motions; sometimes VLBI bibcode : bibcode of the coordinates reference FK4 coord. (ep=B1950 eq=1950) : 15 54 56.4661462436 +09 25 01.690224116 [ 0.1562 0.1710 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''; as well as Tycho2, UCAC4, and Gaia DR2/3 without proper motions B : 0.01-0.1''; as well as Tycho2 and UCAC4 with proper motions A : Hipparcos and Gaia DR2/3 with proper motions; sometimes VLBI bibcode : bibcode of the coordinates reference Gal coord. (ep=J2000) : 019.8352575833453 +42.7153115300867 [ 0.1562 0.1710 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 : -10.202 -25.988 [0.198 0.197 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) 60 [114] / z(spectroscopic) 0.00020 [0.00038] / cz 60.0 [113.9]    E 2008ApJS..175..297A Syntax of parallax is : 'value quality [error] bibcode' value : parallax value quality : flag of quality (A=best quality →E=worst quality, ∼ =unknown quality) [error] : mean error bibcode : bibcode of the parallax reference Parallaxes (mas): 1.7767 [0.1974] A 2020yCat.1350....0G 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 bibcode : bibcode of the spectral type reference Spectral type: DAZ D 2012ApJ...760..123R 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 (9) : G 18.609110 [0.003573] C 2020yCat.1350....0G J 18.82 [0.06] C 2012yCat.2314....0U H 19.03 [0.14] D 2012yCat.2314....0U K 18.35 [0.15] D 2012yCat.2314....0U u (AB) 18.515 [0.016] C 2015ApJS..219...12A g (AB) 18.432 [0.007] C 2015ApJS..219...12A r (AB) 18.806 [0.010] C 2015ApJS..219...12A i (AB) 19.105 [0.013] C 2015ApJS..219...12A z (AB) 19.227 [0.048] C 2015ApJS..219...12A	SIMBAD within arcmin Overlay points in this preview 2MASS DSS SDSSXMMAllWISEIRACIRISGALEX 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!).

WD 1554+094	SDSS J155720.77+091624.6	EQ J1557+0916
GALEX J155720.8+091625	SDSS J155720.78+091624.7	Gaia DR3 4454599238843776128
SDSS J155720.77+091624.7	ULAS J155720.77+091624.6	Gaia DR2 4454599238843776128

References (50 between 1850 and 2025) (Total 50) 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

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

Data at NED - NASA/IPAC Extragalactic Database : WD 1554+094

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