SDSS J081540.75+391056.8

All names: WD 0812+393, SDSS J081540.75+391056.8, GALEX J081540.7+391057, Gaia DR2 909181285925678208, SDSS J081540.75+391056.80, Gaia EDR3 909181285925678208, Gaia DR3 909181285925678208

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 Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 08 15 40.72 (0.7) 08 15 40.75 08 15 40.72 (0.8) 08 15 40.76 (0.7) 08 15 40.75 08 15 40.27 08 15 40.75
Declination 39 10 56.87 (0.6) 39 10 56.82 39 10 56.87 (0.7) 39 10 56.84 (0.6) 39 10 56.81 39 10 53.04 39 10 56.85
Spectral type DB DB DB: DB: DB DA
Effective temperature [K] 13203.0 14566.0 12589.0 14964.0 (924) 14126.0 (831)
log(g) [cgs] 7.58 8.84 8.64 8.10 (0.5) 9.26 (0.6)
Mass [M] 0.376 1.111 0.998 1.394 (0.1)
log(Luminosity) [L]
Cooling age [Gyr] 0.9880
log(H/He) <-6.042
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] 3.10 (0.8) 2.92 (1) 3.10 (0.8)
Distance [pc] 322.45 (80) 342.03 (115) 322.45 (80)
Composition He
Proper motion (right ascension) [mas/yr] -28.85062776 (0.9) -29.10970295 (2) -28.851 (0.9)
Proper motion (declination) [mas/yr] 1.854904823 (0.7) 0.859344796 (1) 1.855 (0.7)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 20.31 (0.05) 20.29 (0.06) 20.33 (0.05) 20.33 20.35 (0.05)
g magnitude 20.35 (0.02) 20.34 (0.02) 20.38 (0.03) 20.38 20.38 (0.03)
r magnitude 20.62 (0.04) 20.63 (0.04) 20.68 (0.04) 20.68 20.67 (0.04)
i magnitude 20.86 (0.06) 20.86 (0.06) 20.91 (0.06) 20.90 20.89 (0.06)
z magnitude 20.92 (0.2) 20.95 (0.2) 20.97 (0.2) 20.97 20.97 (0.2)
G magnitude 20.50 (0.08) 20.58 20.50 (0.009)
BP magnitude 20.43 (0.08) 20.29
RP magnitude 20.25 (0.1) 20.53
Pan g magnitude 20.36 (0.04)
Pan r magnitude 20.62 (0.02)
Pan i magnitude 20.87 (0.04)
Pan z magnitude 21.16 (0.007)
Pan y magnitude
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.