SDSS J123654.96+170918.7

All names: Gaia DR3 3935411463116384384, SDSS J123654.96+170918.7, GALEX J123654.9+170918, SDSS J123654.95+170918.6, Gaia EDR3 3935411463116384384, SDSS J123654.93+170918.5, Gaia DR2 3935411463116384384, SDSS J123654.96+170918.70, SDSS J123654.96+170918.6

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Genest-Beaulieu & Bergeron 2019 (spectroscopic) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Vincent et al. 2024 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 12 36 54.91 (0.1) 12 36 54.91 (0.2) 12 36 54.91 12 36 54.98 (0.1) 12 36 54.96
Declination 17 09 18.50 (0.2) 17 09 18.51 (0.2) 17 09 18.50 17 09 18.77 (0.2) 17 09 18.67
Spectral type DB DB DB DB DB
Effective temperature [K] 27350.0 19776.0 26298.0 (399) 23427.0 (5126) 25162.0 (402)
log(g) [cgs] 7.67 7.66 7.64 (0.05) 7.78 (0.09) 7.71 (0.04)
Mass [M] 0.454 0.427 0.489 (0.07) 0.472 (0.02)
log(Luminosity) [L]
Cooling age [Gyr] 0.0427
log(H/He) <-4.232 <-3.01
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] 2.63 (0.2) 2.52 (0.3) 2.63 2.63 (0.2)
Distance [pc] 379.68 (26) 396.12 (40) 465.00 379.68 379.68 (26)
Composition He
Proper motion (right ascension) [mas/yr] -56.11776691 (0.2) -56.42681613 (0.4) -56.118 (0.2)
Proper motion (declination) [mas/yr] -16.70836475 (0.2) -16.37350249 (0.3) -16.708 (0.2)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 17.81 (0.03) 17.81 (0.03)
g magnitude 18.03 (0.02) 18.03 (0.02)
r magnitude 18.31 (0.02) 18.31 (0.02)
i magnitude 18.63 (0.02) 18.63 (0.02)
z magnitude 18.94 (0.04) 18.94 (0.04)
G magnitude 18.15 (0.02) 18.17 18.15 18.15 (0.004)
BP magnitude 18.08 (0.02) 18.02
RP magnitude 18.31 (0.02) 18.31
Pan g magnitude 18.04 (0.01)
Pan r magnitude 18.34 (0.005)
Pan i magnitude 18.65 (0.01)
Pan z magnitude 18.94 (0.01)
Pan y magnitude 19.07 (0.03)
E(B-V) 0.026

* 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.