SDSS J084334.40+225408.2

All names: SDSS J084334.40+225408.2, GALEX J084334.3+225408, Gaia DR2 665381831055188608, Gaia EDR3 665381831055188608, SDSS J084334.40+225408.20, Gaia DR3 665381831055188608, SDSS J084334.39+225408.2

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 08 43 34.38 (0.4) 08 43 34.39 08 43 34.38 (0.6) 08 43 34.40 (0.4) 08 43 34.40
Declination 22 54 08.04 (0.2) 22 54 08.26 22 54 08.05 (0.3) 22 54 08.30 (0.2) 22 54 08.20
Spectral type DB DB DB DB
Effective temperature [K] 18320.0 18721.0 14498.0 20878.0 (1237)
log(g) [cgs] 8.01 7.04 6.75 8.29 (0.2)
Mass [M] 0.599 0.249 0.188 0.77 (0.1)
log(Luminosity) [L]
Cooling age [Gyr]
log(H/He) -5.269
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] 1.58 (0.4) 0.82 (0.6) 1.58 (0.4)
Distance [pc] 631.93 (175) 1226.40 (913) 631.95 (175)
Composition He
Proper motion (right ascension) [mas/yr] -10.09416022 (0.5) -11.16766895 (1) -10.094 (0.5)
Proper motion (declination) [mas/yr] -16.02393732 (0.3) -16.29615203 (0.7) -16.024 (0.3)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 19.59 (0.03) 19.59 (0.03) 19.68 (0.03)
g magnitude 19.72 (0.01) 19.72 (0.01) 19.72 (0.02)
r magnitude 20.03 (0.02) 20.03 (0.02) 20.08 (0.02)
i magnitude 20.20 (0.03) 20.20 (0.03) 20.33 (0.05)
z magnitude 20.44 (0.1) 20.44 (0.1) 20.33 (0.1)
G magnitude 19.87 (0.03) 19.93 19.87 (0.004)
BP magnitude 19.76 (0.03) 19.77
RP magnitude 19.99 (0.07) 20.00
Pan g magnitude 19.76 (0.01)
Pan r magnitude 20.05 (0.01)
Pan i magnitude 20.29 (0.02)
Pan z magnitude 20.48 (0.03)
Pan y magnitude 19.69 (0.2)
E(B-V) 0.028

* 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.