SDSS J121527.53+373009.1

All names: SDSS J121527.51+373009.1, SDSS J121527.53+373009.1, Gaia DR2 4030369689632505216, GALEX J121527.5+373009, Gaia DR3 4030369689632505216, SDSS J121527.51+373009.13, USNO-A2.0 1275-08059064, Gaia EDR3 4030369689632505216

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR10 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Kepler et al. 2015 Simbad Vincent et al. 2023
Right ascension 12 15 27.49 (0.2) 12 15 27.53 12 15 27.49 (0.4) 12 15 27.55 (0.2)
Declination 37 30 09.07 (0.2) 37 30 09.19 37 30 09.08 (0.2) 37 30 09.19 (0.2)
Spectral type DB DB DB DB
Effective temperature [K] 16077.0 15633.0 14833.0 16247.0 (125) 16300.0 (110)
log(g) [cgs] 7.93 8.17 8.13 8.04 (0.08) 7.98 (0.07)
Mass [M] 0.551 0.694 0.666 0.594 (0.04)
log(Luminosity) [L]
Cooling age [Gyr] 0.2574
log(H/He) <-6.078 <-5.05
log(C/He)
log(Ca/He) <-6.52
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] 2.64 (0.2) 2.70 (0.3) 2.64 (0.2)
Distance [pc] 378.95 (35) 369.75 (48) 417.00 378.95 (35)
Composition He
Proper motion (right ascension) [mas/yr] -45.27340824 (0.2) -45.66067527 (0.8) -45.273 (0.2)
Proper motion (declination) [mas/yr] -6.990822716 (0.2) -6.946919952 (0.4) -6.991 (0.2)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 18.60 (0.3)
V magnitude
R magnitude 18.70 (0.3)
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 19.07 (0.02) 19.07 (0.02) 19.07 (0.02)
g magnitude 19.17 (0.01) 19.17 (0.01) 19.17 (0.01)
r magnitude 19.44 (0.01) 19.44 (0.01) 19.45 (0.01)
i magnitude 19.70 (0.02) 19.70 (0.02) 19.70 (0.02)
z magnitude 20.05 (0.1) 20.05 (0.1) 20.05 (0.1)
G magnitude 19.33 (0.04) 19.37 19.33 (0.004)
BP magnitude 19.30 (0.04) 19.27
RP magnitude 19.54 (0.09) 19.38
Pan g magnitude 19.22 (0.02)
Pan r magnitude 19.46 (0.02)
Pan i magnitude 19.77 (0.01)
Pan z magnitude 19.95 (0.03)
Pan y magnitude 20.02 (0.05)
E(B-V) 0.018

* 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.