SDSS J143846.21+280455.9

All names: LAMOST J143846.21+280455.9, SDSS J143846.20+280455.7, Gaia EDR3 1280774709550171648, Gaia DR2 1280774709550171648, SDSS J143846.21+280455.90, Gaia DR3 1280774709550171648, SDSS J143846.21+280455.9, GALEX J143846.2+280456

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Vincent et al. 2024 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 14 38 46.19 (0.1) 14 38 46.21 14 38 46.19 (0.2) 14 38 46.19 14 38 46.22 (0.1) 14 38 46.21
Declination 28 04 55.62 (0.2) 28 04 55.98 28 04 55.63 (0.2) 28 04 55.62 28 04 56.05 (0.2) 28 04 55.91
Spectral type DB DB DB DB DB
Effective temperature [K] 16362.0 15325.0 14649.0 16486.0 (177) 14965.0 (1212) 16552.0 (223)
log(g) [cgs] 7.95 7.83 7.78 7.86 (0.1) 7.93 (0.1) 8.01 (0.1)
Mass [M] 0.565 0.498 0.47 0.548 (0.1) 0.592 (0.07)
log(Luminosity) [L]
Cooling age [Gyr] 0.1533
log(H/He) <-5.886 <-4.73
log(C/He)
log(Ca/He) <-6.04
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] 2.69 (0.2) 2.44 (0.3) 2.69 2.69 (0.2)
Distance [pc] 371.49 (33) 410.44 (53) 431.00 371.49 371.50 (33)
Composition He
Proper motion (right ascension) [mas/yr] -21.00020658 (0.2) -20.73017714 (0.6) -21.0 (0.2)
Proper motion (declination) [mas/yr] -26.55867356 (0.2) -25.99641123 (0.6) -26.559 (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 18.82 (0.02) 18.82 (0.02) 18.86 (0.03)
g magnitude 18.89 (0.009) 18.89 (0.009) 18.95 (0.02)
r magnitude 19.24 (0.01) 19.24 (0.01) 19.30 (0.02)
i magnitude 19.41 (0.02) 19.41 (0.02) 19.45 (0.03)
z magnitude 19.57 (0.09) 19.57 (0.09) 19.62 (0.1)
G magnitude 19.08 (0.02) 19.13 19.08 19.08 (0.003)
BP magnitude 19.02 (0.02) 18.93
RP magnitude 19.18 (0.04) 19.10
Pan g magnitude 18.97 (0.005)
Pan r magnitude 19.24 (0.006)
Pan i magnitude 19.48 (0.01)
Pan z magnitude 19.69 (0.02)
Pan y magnitude 19.94 (0.1)
E(B-V) 0.022

* 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.