SDSS J225652.76+225738.3

All names: SDSS J225652.76+225738.28, Gaia DR2 2836129775004898304, GALEX J225652.7+225738, SDSS J225652.76+225738.3, SDSS J225652.76+225738.2, Gaia DR3 2836129775004898304, Gaia EDR3 2836129775004898304, SDSS J225652.77+225738.3, USNO-B1.0 1129-00670112, USNO-A2.0 1125-19579323

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Kepler et al. 2016 Koester & Kepler 2015 Simbad Vincent et al. 2023
Right ascension 22 56 52.75 (0.3) 22 56 52.77 22 56 52.75 (0.2) 22 56 52.78 (0.3)
Declination 22 57 38.28 (0.2) 22 57 38.33 22 57 38.28 (0.2) 22 57 38.38 (0.2)
Spectral type DB DB DB DB
Effective temperature [K] 12609.0 11637.0 10948.0 12290.0 (371) 11011.0 (102)
log(g) [cgs] 8.87 8.01 7.92 8.76 (0.3) 8.00 (0)
Mass [M] 1.126 0.589 0.537 1.045 (0.2)
log(Luminosity) [L]
Cooling age [Gyr] 0.4408
log(H/He) -5.662 <-5.75
log(C/He)
log(Ca/He) <-10.61
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] 4.17 (0.2) 3.80 (0.3) 4.17 (0.2)
Distance [pc] 239.78 (14) 263.39 (22) 241.00 239.79 (14)
Composition He
Proper motion (right ascension) [mas/yr] -22.11803427 (0.4) -21.93921594 (0.6) -22.118 (0.4)
Proper motion (declination) [mas/yr] -6.373560455 (0.2) -5.367981032 (0.4) -6.374 (0.2)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 18.90
V magnitude
R magnitude 19.20
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 19.04 (0.02) 19.02 (0.02) 19.05 (0.02)
g magnitude 19.01 (0.009) 19.04 (0.02) 19.01 (0.009)
r magnitude 19.14 (0.01) 19.13 (0.02) 19.14 (0.01)
i magnitude 19.29 (0.02) 19.27 (0.02) 19.27 (0.02)
z magnitude 19.53 (0.06) 19.51 (0.06) 19.51 (0.06)
G magnitude 19.02 (0.03) 19.07 19.02 (0.004)
BP magnitude 19.12 (0.03) 18.99
RP magnitude 18.94 (0.05) 18.98
Pan g magnitude 18.99 (0.009)
Pan r magnitude 19.12 (0.01)
Pan i magnitude 19.31 (0.01)
Pan z magnitude 19.46 (0.01)
Pan y magnitude 19.58 (0.05)
E(B-V) 0.030

* 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.