SDSS J101800.81+370840.6

All names: SDSS J101800.83+370840.6, SDSS J101800.81+370840.64, Gaia EDR3 754117577672241920, SDSS J101800.81+370840.6, GALEX J101800.8+370841, Gaia DR3 754117577672241920, J1018+3708, SDSS J101800.83+370840.7, Gaia DR2 754117577672241920

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR10 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) Coutu et al. 2019 Gaia DR2 Stilism Koester & Kepler 2015 Kepler et al. 2015 Vincent et al. 2024 Simbad Vincent et al. 2023
Right ascension 10 18 00.79 (0.1) 10 18 00.83 10 18 00.84 10 18 00.79 (0.2) 10 18 00.79 10 18 00.84 (0.1)
Declination 37 08 40.65 (0.1) 37 08 40.70 37 08 40.69 37 08 40.65 (0.2) 37 08 40.65 37 08 40.70 (0.1)
Spectral type DBZ DBZ: DB DBZ DB
Effective temperature [K] 15034.0 15767.0 15508.0 (1643) 15020.0 (55) 15251.0 (94) 14656.0 (833)
log(g) [cgs] 8.15 8.17 8.18 8.00 (0) 8.07 (0.07) 8.15 (0.08)
Mass [M] 0.679 0.696 0.7021 0.6609999999999999 (0.04) 0.682 (0.07)
log(Luminosity) [L]
Cooling age [Gyr] 0.2490
log(H/He) -5.489 <-5.8532 <-5.17
log(C/He)
log(Ca/He) -7.2261 (0.3) -7.63 (0.3)
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] 3.90 (0.2) 3.67 3.67 (0.3) 3.90 3.90 (0.2)
Distance [pc] 256.41 (13) 272.26 (20) 272.26 (20) 289.00 256.41 256.41 (12)
Composition He
Proper motion (right ascension) [mas/yr] -36.7373467 (0.2) -36.52911821 (0.4) -36.737 (0.2)
Proper motion (declination) [mas/yr] -2.814540252 (0.1) -2.676071665 (0.3) -2.815 (0.1)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 18.37 (0.01) 18.37 (0.01) 18.37 (0.01)
g magnitude 18.47 (0.007) 18.47 (0.01) 18.47 (0.007)
r magnitude 18.78 (0.009) 18.78 (0.01) 18.78 (0.009)
i magnitude 19.04 (0.01) 19.04 (0.01) 19.04 (0.01)
z magnitude 19.24 (0.04) 19.24 (0.04) 19.24 (0.04)
G magnitude 18.61 (0.01) 18.65 18.61 18.61 (0.003)
BP magnitude 18.53 (0.01) 18.48
RP magnitude 18.71 (0.03) 18.63
Pan g magnitude 18.53 (0.01)
Pan r magnitude 18.77 (0.008)
Pan i magnitude 19.02 (0.008)
Pan z magnitude 19.22 (0.01)
Pan y magnitude 19.27 (0.1)
E(B-V) 0.016

* 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.