SDSS J115538.57+254135.2

All names: GALEX J115538.5+254136, SDSS J115538.57+254135.20, SDSS J115538.56+254135.2, SDSS J115538.57+254135.2, Gaia DR3 4006305022233214720, Gaia EDR3 4006305022233214720, Gaia DR2 4006305022233214720, SDSS J115538.55+254135.1

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Bedard et al. 2020 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 11 55 38.55 (0.2) 11 55 38.56 11 55 38.55 (0.3) 11 55 38.57 (0.2) 11 55 38.57
Declination 25 41 35.27 (0.2) 25 41 35.22 25 41 35.27 (0.2) 25 41 35.22 (0.2) 25 41 35.22
Spectral type DB DB DB DB DB
Effective temperature [K] 36765.0 (2157) 35311.0 39460.0 28627.0 34626.0 (534) 34592.0 (997)
log(g) [cgs] 7.92 (0.2) 7.75 8.12 7.80 7.79 (0.08) 7.99 (0.1)
Mass [M] 0.59 (0.1) 0.505 0.697 0.511 0.617 (0.05)
log(Luminosity) [L] -0.50 (0.2)
Cooling age [Gyr] 0.0052 (0.001) 0.0116
log(H/He) <-3.268 <-3.0
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] 1.44 (0.3) 1.40 (0.4) 1.44 (0.3)
Distance [pc] 693.75 (126) 715.37 (187) 814.00 693.77 (126)
Composition He He
Proper motion (right ascension) [mas/yr] -18.68642959 (0.3) -18.37270461 (0.6) -18.686 (0.3)
Proper motion (declination) [mas/yr] 3.36404566 (0.2) 3.785412061 (0.4) 3.364 (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 18.65 (0.02) 18.65 (0.02) 18.66 (0.02)
g magnitude 19.01 (0.009) 19.01 (0.009) 19.03 (0.02)
r magnitude 19.44 (0.01) 19.44 (0.01) 19.46 (0.02)
i magnitude 19.79 (0.03) 19.79 (0.03) 19.79 (0.03)
z magnitude 20.25 (0.1) 20.25 (0.1) 20.24 (0.1)
G magnitude 19.22 (0.02) 19.27 19.22 (0.004)
BP magnitude 19.12 (0.02) 19.07
RP magnitude 19.41 (0.06) 19.42
Pan g magnitude 19.06 (0.008)
Pan r magnitude 19.45 (0.006)
Pan i magnitude 19.80 (0.02)
Pan z magnitude 20.07 (0.05)
Pan y magnitude 20.22 (0.03)
E(B-V) 0.020

* 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.