SDSS J081656.17+204946.0

All names: Gaia DR3 675767959626673152, SDSS J081656.17+204946.10, Gaia EDR3 675767959626673152, GALEX J081656.1+204946, SDSS J081656.17+204946.1, Gaia DR2 675767959626673152, SDSS J081656.16+204945.9, LAMOST J081656.19+204946.4, SDSS J081656.17+204945.9, LAMOST J081656.09+204944.9, SDSS J081656.17+204946.0

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Guo et al. 2015 Koester & Kepler 2015 Vincent et al. 2024 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 08 16 56.15 (0.07) 08 16 56.18 08 16 56.15 (0.1) 08 16 56.15 08 16 56.18 (0.07) 08 16 56.17
Declination 20 49 45.84 (0.05) 20 49 46.00 20 49 45.84 (0.06) 20 49 45.84 20 49 46.06 (0.05) 20 49 46.05
Spectral type DB DB DB DB DB DB
Effective temperature [K] 25712.0 24425.0 21463.0 27463.0 (182) 24637.0 (2184) 25480.0 (296)
log(g) [cgs] 8.00 8.08 8.03 7.89 (0.03) 8.06 (0.03) 7.97 (0.03)
Mass [M] 0.606 0.651 0.619 0.643 (0.03) 0.589 (0.01)
log(Luminosity) [L]
Cooling age [Gyr] 0.0538
log(H/He) <-4.472 <-3.07
log(C/He)
log(Ca/He) <-4.0
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] 4.79 (0.08) 4.87 (0.1) 4.79 4.79 (0.08)
Distance [pc] 208.87 (3) 205.53 (5) 253.00 208.87 208.87 (3)
Composition He
Proper motion (right ascension) [mas/yr] -29.792865 (0.09) -29.84648506 (0.2) -29.793 (0.09)
Proper motion (declination) [mas/yr] -13.69827729 (0.06) -13.97269507 (0.1) -13.698 (0.06)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 16.78 (0.007) 16.78 (0.007) 16.83 (0.01)
g magnitude 16.95 (0.004) 16.95 (0.004) 17.00 (0.02)
r magnitude 17.34 (0.005) 17.34 (0.005) 17.35 (0.02)
i magnitude 17.65 (0.007) 17.65 (0.007) 17.66 (0.01)
z magnitude 17.94 (0.02) 17.94 (0.02) 17.99 (0.03)
G magnitude 17.15 (0.006) 17.19 17.15 17.15 (0.003)
BP magnitude 17.07 (0.006) 17.00
RP magnitude 17.35 (0.01) 17.32
Pan g magnitude 17.01 (0.003)
Pan r magnitude 17.37 (0.003)
Pan i magnitude 17.66 (0.004)
Pan z magnitude 17.91 (0.008)
Pan y magnitude 18.10 (0.02)
E(B-V) 0.009

* 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.