SDSS J220827.84+223636.9

All names: GALEX J220827.9+223635, Gaia EDR3 1782917757240791680, Gaia DR3 1782917757240791680, SDSS J220828.00+223635.4, Gaia DR2 1782917757240791680, WDJ220827.93+223636.02, SDSS J220827.95+223635.7, SDSS J220827.84+223636.9, SDSS J220827.84+223636.90, SDSS J220827.95+223635.8

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR10 Kilic et al. 2025 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Kepler et al. 2015 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 Vincent et al. 2023
Right ascension 22 08 28.01 (0.06) 22 08 27.95 22 08 28.01 (0.09) 22 08 28.01 22 08 27.93 (0.06) 22 08 28.01
Declination 22 36 35.27 (0.06) 22 36 35.79 22 36 35.29 (0.08) 22 36 35.27 22 36 36.03 (0.06) 22 36 35.29
Spectral type DB DB DB DB DB DB
Effective temperature [K] 11875.0 (138) 12538.0 11958.0 11505.0 12181.0 (84) 12256.0 (79) 11857.0 (196)
log(g) [cgs] 8.03 (0.01) 8.17 8.04 7.99 8.00 (0) 8.00 (0) 8.03 (0.02)
Mass [M] 0.604 (0.01) 0.688 0.611 0.579 0.604 (0.02)
log(Luminosity) [L]
Cooling age [Gyr] 0.4243
log(H/He) -6.0 -6.046 <-5.86
log(C/He)
log(Ca/He) <-10.02
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] 10.74 (0.07) 10.77 (0.1) 10.74 10.74 (0.07) 10.77 (0.1)
Distance [pc] 93.10 (0.6) 92.86 (0.9) 93.00 93.10 93.10 (0.6) 92.86 (0.9)
Composition He
Proper motion (right ascension) [mas/yr] 74.42721685 (0.07) 74.45235702 (0.2) 74.427 (0.07) 74.45235702
Proper motion (declination) [mas/yr] -47.1779878 (0.08) -47.03706907 (0.1) -47.178 (0.09) -47.03706907
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 16.65 (0.007) 16.65 (0.02) 16.64 (0.007) 16.64 (0.007)
g magnitude 16.62 (0.004) 16.65 (0.02) 16.63 (0.004) 16.62 (0.004)
r magnitude 16.82 (0.004) 16.81 (0.01) 16.83 (0.004) 16.82 (0.004)
i magnitude 16.99 (0.005) 16.98 (0.02) 17.01 (0.005) 16.99 (0.005)
z magnitude 17.20 (0.01) 17.20 (0.02) 17.20 (0.01) 17.20 (0.01)
G magnitude 16.71 (0.005) 16.74 16.71 16.71 (0.003) 16.74
BP magnitude 16.71 (0.005) 16.70 16.70
RP magnitude 16.72 (0.008) 16.70 16.70
Pan g magnitude 16.68 (0.005)
Pan r magnitude 16.85 (0.004)
Pan i magnitude 17.03 (0.004)
Pan z magnitude 17.20 (0.004)
Pan y magnitude 17.35 (0.009)
E(B-V) 0.017

* 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.