SDSS J204919.49+765828.9

All names: Gaia EDR3 2278650471751543680, SDSS J204919.49+765828.9, Gaia DR2 2278650471751543680, SDSS J204919.49+765828.90, Gaia DR3 2278650471751543680, GALEX J204919.6+765828

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Vincent et al. 2024 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 20 49 19.62 (0.1) 20 49 19.49 20 49 19.61 (0.2) 20 49 19.62 20 49 19.47 (0.1) 20 49 19.49
Declination 76 58 28.95 (0.1) 76 58 28.95 76 58 28.95 (0.2) 76 58 28.95 76 58 28.99 (0.1) 76 58 28.93
Spectral type DB DB DB DB DB
Effective temperature [K] 9830.0 26183.0 12188.0 14437.0 (123) 12988.0 (614) 15158.0 (251)
log(g) [cgs] 10.10 8.41 7.76 8.00 (0) 7.84 (0.08) 8.67 (0.2)
Mass [M] 1.87 0.857 0.456 0.497 (0.06) 1.009 (0.09)
log(Luminosity) [L]
Cooling age [Gyr] 0.2673
log(H/He) -5.546 <-5.23
log(C/He)
log(Ca/He) <-7.64
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] 3.39 (0.1) 3.30 (0.2) 3.39 3.39 (0.1)
Distance [pc] 295.10 (12) 303.20 (16) 249.00 295.10 295.10 (12)
Composition He
Proper motion (right ascension) [mas/yr] 31.38012458 (0.2) 31.13097921 (0.3) 31.38 (0.2)
Proper motion (declination) [mas/yr] -2.54651828 (0.2) -2.075457772 (0.4) -2.547 (0.2)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 18.69 (0.02) 18.69 (0.02) 18.68 (0.03)
g magnitude 18.75 (0.009) 18.75 (0.009) 18.75 (0.01)
r magnitude 18.96 (0.01) 18.96 (0.01) 18.96 (0.02)
i magnitude 19.16 (0.02) 19.16 (0.02) 19.14 (0.02)
z magnitude 19.48 (0.07) 19.48 (0.07) 19.40 (0.06)
G magnitude 18.82 (0.03) 18.86 18.82 18.82 (0.004)
BP magnitude 18.84 (0.03) 18.77
RP magnitude 18.83 (0.03) 18.79
Pan g magnitude 18.77 (0.006)
Pan r magnitude 18.97 (0.01)
Pan i magnitude 19.18 (0.009)
Pan z magnitude 19.39 (0.03)
Pan y magnitude 19.32 (0.07)
E(B-V) 0.076

* 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.