SDSS J081918.72+445259.6

All names: Gaia DR3 928523550884377984, SDSS J081918.72+445259.5, SDSS J081918.72+445259.6, WD 0815+450, Gaia DR2 928523550884377984, GALEX J081918.8+445259, Gaia EDR3 928523550884377984

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 19 18.73 (0.4) 08 19 18.73 08 19 18.73 (0.5) 08 19 18.73 (0.4) 08 19 18.72 08 19 18.79 08 19 18.72
Declination 44 52 59.66 (0.3) 44 52 59.64 44 52 59.66 (0.4) 44 52 59.63 (0.3) 44 52 59.66 44 52 58.08 44 52 59.56
Spectral type DA DA DA_auto DA DA DA
Effective temperature [K] 8515.0 9526.0 (108) 9382.0 (115)
log(g) [cgs] 7.50 8.64 (0.1) 8.55 (0.1)
Mass [M☉] 0.349 0.936 (0.09)
log(Luminosity) [L☉]
Cooling age [Gyr] 0.5377
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] 3.42 (0.5) 2.83 (0.6) 3.42 (0.5)
Distance [pc] 292.14 (39) 352.75 (76) 292.14 (39)
Composition H
Proper motion (right ascension) [mas/yr] 1.134550919 (0.4) 1.234698823 (0.9) 1.135 (0.4) 0.3
Proper motion (declination) [mas/yr] 1.530046919 (0.4) 2.527749313 (0.7) 1.53 (0.4) -7.7
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 20.34 (0.04) 20.34 (0.04) 20.30 (0.05) 20.30 20.32 (0.05)
g magnitude 19.88 (0.02) 19.88 (0.01) 19.89 (0.02) 19.89 19.90 (0.02)
r magnitude 19.86 (0.02) 19.86 (0.02) 19.84 (0.02) 19.84 19.85 (0.02)
i magnitude 19.88 (0.03) 19.88 (0.03) 19.88 (0.03) 19.88 19.88 (0.03)
z magnitude 20.03 (0.09) 20.03 (0.09) 20.03 (0.09) 20.04 20.03 (0.09)
G magnitude 19.79 (0.05) 19.83 19.79 (0.005)
BP magnitude 19.89 (0.05) 19.93
RP magnitude 19.52 (0.07) 19.71
Pan g magnitude 19.86 (0.02)
Pan r magnitude 19.82 (0.009)
Pan i magnitude 19.91 (0.009)
Pan z magnitude 20.04 (0.03)
Pan y magnitude 20.06 (0.1)
E(B-V) 0.020

* 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.