SDSS J173946.40+543842.4

All names: SDSS J173946.40+543842.40, Gaia DR2 1417940640541160064, Gaia DR3 1417940640541160064, Gaia EDR3 1417940640541160064, SDSS J173946.40+543842.4, GALEX J173946.3+543842

Parameter Unit Gaia EDR3 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 17 39 46.39 (0.6) 17 39 46.40 17 39 46.39 (1) 17 39 46.41 (0.6) 17 39 46.40
Declination 54 38 42.25 (0.7) 54 38 42.49 54 38 42.26 (0.9) 54 38 42.53 (0.7) 54 38 42.44
Spectral type DB DB DB DC:
Effective temperature [K] 15331.0 14306.0 18445.0 13545.0 (553)
log(g) [cgs] 9.53 9.00 9.32 7.61 (0.4)
Mass [M] 1.369 1.189 1.301 0.391 (0.2)
log(Luminosity) [L]
Cooling age [Gyr] 0.8335
log(H/He) -5.436
log(C/He)
log(Ca/He)
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] 1.30 (0.7) 3.34 (1) 1.30 (0.7)
Distance [pc] 768.97 (398) 299.17 (88) 768.99 (398)
Composition He
Proper motion (right ascension) [mas/yr] -8.583681913 (0.7) -6.582534537 (2) -8.584 (0.7)
Proper motion (declination) [mas/yr] -17.03002199 (0.9) -16.83871752 (2) -17.03 (0.9)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 20.42 (0.05) 20.49 (0.07) 20.49 (0.07)
g magnitude 20.43 (0.02) 20.44 (0.03) 20.44 (0.03)
r magnitude 20.72 (0.03) 20.68 (0.04) 20.68 (0.04)
i magnitude 20.94 (0.05) 20.97 (0.07) 20.97 (0.07)
z magnitude 21.57 (0.4) 21.15 (0.4) 21.15 (0.4)
G magnitude 20.54 (0.1) 20.63 20.54 (0.009)
BP magnitude 20.68 (0.1) 20.41
RP magnitude 20.57 (0.1) 20.28
Pan g magnitude
Pan r magnitude
Pan i magnitude
Pan z magnitude
Pan y magnitude
E(B-V) 0.029

* 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.