SDSS J081829.42+245134.4

All names: SDSS J081829.42+245134.4, GALEX J081829.4+245134, SDSS J081829.42+245134.5, WD 0815+250, Gaia EDR3 679313987705702656, Gaia DR2 679313983408778752, Gaia DR3 679313987705702656

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 MWDD H 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 18 29.43 (0.4) 08 18 29.42 08 18 29.43 (0.7) 08 18 29.42 (0.4) 08 18 29.42 08 18 29.42 08 18 29.42
Declination 24 51 33.85 (0.3) 24 51 34.48 24 51 33.88 (0.6) 24 51 34.61 (0.3) 24 51 34.50 24 51 29.88 24 51 34.50
Spectral type DA DA DA_auto DA DA DA
Effective temperature [K] 8799.0 8968.0 (113) 8796.0 (127)
log(g) [cgs] 7.97 8.50 (0.2) 8.23 (0.2)
Mass [M☉] 0.577 0.733 (0.1)
log(Luminosity) [L☉]
Cooling age [Gyr] 0.8006
log(H/He)
log(C/He)
log(Ca/He)
log(Ca/H)
log(C/H)
log(N/H)
log(O/H)
log(Na/H)
log(Mg/H)
log(Al/H)
log(Si/H)
log(P/H)
log(S/H)
log(Sc/H)
log(Ti/H)
log(Cr/H)
log(Mn/H)
log(Fe/H)
log(Ni/H)
Parallax [mas] 3.46 (0.5) 3.51 (1) 3.46 (0.5)
Distance [pc] 289.36 (45) 284.59 (89) 289.36 (45)
Composition H
Proper motion (right ascension) [mas/yr] 11.72532565 (0.5) 12.84640834 (1) 11.725 (0.5) 22.0
Proper motion (declination) [mas/yr] -47.67384423 (0.4) -48.08881204 (1) -47.674 (0.4) -51.5
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 20.27 (0.05) 20.27 (0.05) 20.26 (0.06) 20.26 20.26 (0.06)
g magnitude 19.89 (0.02) 19.89 (0.02) 19.89 (0.02) 19.89 19.89 (0.02)
r magnitude 19.93 (0.02) 19.93 (0.02) 19.92 (0.02) 19.92 19.92 (0.02)
i magnitude 19.94 (0.03) 19.94 (0.03) 19.95 (0.03) 19.95 19.96 (0.03)
z magnitude 19.87 (0.1) 19.87 (0.1) 19.87 (0.1) 19.87 19.86 (0.1)
G magnitude 19.87 (0.06) 19.92 19.87 (0.005)
BP magnitude 20.11 (0.06) 19.85
RP magnitude 19.71 (0.08) 19.52
Pan g magnitude 19.88 (0.01)
Pan r magnitude 19.91 (0.02)
Pan i magnitude 20.00 (0.02)
Pan z magnitude 20.08 (0.03)
Pan y magnitude 19.55 (0.2)
E(B-V) 0.015

* 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.