SDSS J204213.01+764041.1

All names: Gaia DR2 2278628241001120512, SDSS J204213.01+764041.1, SDSS J204212.96+764041.1, Gaia EDR3 2278628245297775104, SDSS J204213.01+764041.10, Gaia DR3 2278628245297775104, GALEX J204212.9+764041

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 42 13.07 (0.2) 20 42 12.96 20 42 13.06 (0.2) 20 42 13.07 20 42 12.92 (0.2) 20 42 13.01
Declination 76 40 41.31 (0.2) 76 40 41.19 76 40 41.31 (0.3) 76 40 41.31 76 40 41.12 (0.2) 76 40 41.13
Spectral type DBAH: DB DBAH DBAH: DB+MS
Effective temperature [K] 14545.0 15522.0 12279.0 14703.0 (107) 14889.0 (1402) 15131.0 (213)
log(g) [cgs] 7.99 8.13 7.96 8.00 (0) 8.21 (0.1) 8.54 (0.1)
Mass [M] 0.585 0.666 0.561 0.719 (0.1)
log(Luminosity) [L]
Cooling age [Gyr] 0.3386
log(H/He) -5.295 <-5.27
log(C/He)
log(Ca/He) <-7.55
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] 3.08 (0.2) 2.96 (0.3) 3.08 3.08 (0.2)
Distance [pc] 324.30 (23) 338.12 (31) 327.00 324.30 324.30 (23)
Composition He
Proper motion (right ascension) [mas/yr] 32.31171522 (0.3) 32.27314452 (0.5) 32.312 (0.3)
Proper motion (declination) [mas/yr] 12.4158659 (0.3) 11.43240285 (0.6) 12.416 (0.3)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity WDMS
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 19.21 (0.03) 19.21 (0.03) 19.20 (0.04)
g magnitude 19.19 (0.01) 19.19 (0.01) 19.20 (0.02)
r magnitude 19.41 (0.02) 19.41 (0.01) 19.41 (0.02)
i magnitude 19.61 (0.02) 19.61 (0.02) 19.61 (0.02)
z magnitude 19.58 (0.09) 19.58 (0.09) 19.57 (0.1)
G magnitude 19.30 (0.03) 19.33 19.30 19.30 (0.004)
BP magnitude 19.34 (0.03) 19.25
RP magnitude 19.36 (0.04) 19.28
Pan g magnitude 19.30 (0.02)
Pan r magnitude 19.41 (0.01)
Pan i magnitude 19.61 (0.01)
Pan z magnitude 19.91 (0.01)
Pan y magnitude 19.86 (0.2)
E(B-V) 0.116

* 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.