SDSS J002458.42+245834.2

All names: SDSS J002458.42+245834.2, SDSS J002458.42+245834.26, Gaia DR2 2807276970688924928, SDSS J002458.40+245834.6, SDSS J002458.42+245834.3, GALEX J002458.4+245835, Gaia DR3 2807276970688924928, Gaia EDR3 2807276970688924928

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 Vincent et al. 2024 Simbad Vincent et al. 2023
Right ascension 00 24 58.42 (0.08) 00 24 58.41 00 24 58.42 (0.1) 00 24 58.42 00 24 58.41 (0.08)
Declination 24 58 34.13 (0.06) 24 58 34.64 24 58 34.15 (0.1) 24 58 34.13 24 58 34.82 (0.06)
Spectral type DB DB DB DB DB
Effective temperature [K] 20592.0 22275.0 18546.0 23730.0 (251) 20691.0 (162) 18600.0 (819)
log(g) [cgs] 8.11 8.15 7.97 8.00 (0.02) 8.07 (0.03) 7.93 (0.05)
Mass [M] 0.662 0.69 0.577 0.602 (0.01) 0.559 (0.04)
log(Luminosity) [L]
Cooling age [Gyr] 0.0881
log(H/He) -4.739 <-4.2
log(C/He)
log(Ca/He) <-4.55
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] 4.48 (0.1) 4.56 (0.2) 4.48 4.48 (0.1)
Distance [pc] 223.11 (5) 219.34 (8) 213.00 223.11 223.11 (5)
Composition He
Proper motion (right ascension) [mas/yr] 14.60803601 (0.1) 14.47056962 (0.3) 14.608 (0.1)
Proper motion (declination) [mas/yr] -42.83863956 (0.1) -43.13063273 (0.2) -42.839 (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 17.15 (0.008) 17.14 (0.01) 17.15 (0.008)
g magnitude 17.28 (0.004) 17.31 (0.02) 17.28 (0.004)
r magnitude 17.62 (0.006) 17.62 (0.02) 17.61 (0.006)
i magnitude 17.92 (0.007) 17.91 (0.02) 17.92 (0.007)
z magnitude 18.24 (0.02) 18.27 (0.03) 18.24 (0.03)
G magnitude 17.45 (0.007) 17.48 17.45 17.45 (0.003)
BP magnitude 17.39 (0.007) 17.36
RP magnitude 17.60 (0.01) 17.58
Pan g magnitude 17.31 (0.005)
Pan r magnitude 17.63 (0.004)
Pan i magnitude 17.92 (0.005)
Pan z magnitude 18.17 (0.01)
Pan y magnitude 18.33 (0.02)
E(B-V) 0.032

* 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.