SDSS J044420.12-002241.9

All names: SDSS J044420.12-002241.9, SDSS J044420.12-002241.97, Gaia DR3 3229932642019384192, GALEX J044420.0-002241, Gaia DR2 3229932642019384192, Gaia EDR3 3229932642019384192

Parameter Unit Gaia EDR3 SDSS DR10 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Kepler et al. 2015 Simbad Vincent et al. 2023
Right ascension 04 44 20.12 (0.5) 04 44 20.11 04 44 20.12 (0.8) 04 44 20.12 (0.5)
Declination -00 22 42.02 (0.3) -00 22 41.92 -00 22 42.01 (0.5) -00 22 41.95 (0.3)
Spectral type DB DB DB DB
Effective temperature [K] 21109.0 20195.0 29323.0 18781.0 (500)
log(g) [cgs] 8.34 8.13 8.52 8.38 (0.05)
Mass [M] 0.808 0.678 0.931 0.816 (0.04)
log(Luminosity) [L]
Cooling age [Gyr] 0.0559
log(H/He) -3.798
log(C/He)
log(Ca/He)
log(Ca/H)
log(N/He)
log(O/He)
log(Na/He)
log(Mg/He)
log(Al/He)
log(Si/He)
log(P/He)
log(S/He)
log(Cl/He)
log(Sc/He)
log(Ti/He)
log(V/He)
log(Cr/He)
log(Mn/He)
log(Fe/He)
log(Co/He)
log(Ni/He)
log(Cu/He)
log(Zn/He)
log(Ga/He)
log(Ge/He)
log(Sr/He)
Parallax [mas] 1.10 (0.6) 1.34 (0.8) 1.10 (0.6)
Distance [pc] 909.09 (514) 744.00 (458) 909.09 (514)
Composition He
Proper motion (right ascension) [mas/yr] 6.639209926 (1) 8.373559499 (2) 6.639 (1)
Proper motion (declination) [mas/yr] -4.22835185 (0.8) -6.902505205 (1) -4.228 (0.8)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 20.09 (0.04) 20.09 (0.04) 20.09 (0.04)
g magnitude 20.14 (0.02) 20.14 (0.02) 20.14 (0.02)
r magnitude 20.43 (0.03) 20.43 (0.03) 20.43 (0.03)
i magnitude 20.73 (0.05) 20.73 (0.05) 20.73 (0.05)
z magnitude 21.46 (0.4) 21.46 (0.4) 21.46 (0.4)
G magnitude 20.30 (0.07) 20.39 20.30 (0.007)
BP magnitude 20.30 (0.07) 20.08
RP magnitude 20.24 (0.1) 20.38
Pan g magnitude
Pan r magnitude
Pan i magnitude
Pan z magnitude
Pan y magnitude
E(B-V) 0.036

* Constant surface field

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The Montreal White Dwarf Database is produced and maintained by Prof. Patrick Dufour (Université de Montréal) and Dr. Simon Blouin (University of Victoria). Please send database updates, corrections, suggestions or bug reports to patrick.dufour@umontreal.ca.