SDSS J170731.42+395755.0

All names: Gaia EDR3 1353512287106335744, GALEX J170731.4+395755, SDSS J170731.41+395755.2, Gaia DR3 1353512287106335744, Gaia DR2 1353512287106335744, SDSS J170731.42+395755.04, SDSS J170731.42+395755.0

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR10 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Kepler et al. 2015 Vincent et al. 2024 Simbad Vincent et al. 2023
Right ascension 17 07 31.43 (0.1) 17 07 31.41 17 07 31.43 (0.1) 17 07 31.43 17 07 31.42 (0.1)
Declination 39 57 55.01 (0.1) 39 57 55.21 39 57 55.02 (0.2) 39 57 55.01 39 57 55.25 (0.1)
Spectral type DB DB DB DB DB
Effective temperature [K] 16474.0 16799.0 14780.0 16973.0 (93) 16784.0 (89) 20514.0 (2149)
log(g) [cgs] 7.97 8.12 7.94 8.06 (0.06) 8.07 (0.05) 8.36 (0.09)
Mass [M] 0.573 0.662 0.556 0.639 (0.03) 0.821 (0.08)
log(Luminosity) [L]
Cooling age [Gyr] 0.1894
log(H/He) <-6.199 <-5.06
log(C/He)
log(Ca/He) <-6.34
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] 3.35 (0.1) 3.38 (0.2) 3.35 3.35 (0.1)
Distance [pc] 298.27 (11) 295.92 (14) 309.00 298.27 298.28 (11)
Composition He
Proper motion (right ascension) [mas/yr] 9.041555476 (0.1) 9.068556348 (0.3) 9.042 (0.1)
Proper motion (declination) [mas/yr] -14.44227731 (0.2) -14.43289109 (0.3) -14.442 (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 18.37 (0.02) 18.37 (0.03) 18.37 (0.02)
g magnitude 18.45 (0.007) 18.46 (0.01) 18.45 (0.007)
r magnitude 18.73 (0.009) 18.73 (0.02) 18.73 (0.009)
i magnitude 19.00 (0.01) 18.99 (0.02) 19.00 (0.01)
z magnitude 19.42 (0.07) 19.42 (0.07) 19.42 (0.07)
G magnitude 18.57 (0.02) 18.61 18.57 18.57 (0.003)
BP magnitude 18.54 (0.02) 18.48
RP magnitude 18.74 (0.04) 18.61
Pan g magnitude 18.46 (0.01)
Pan r magnitude 18.74 (0.007)
Pan i magnitude 19.00 (0.005)
Pan z magnitude 19.22 (0.03)
Pan y magnitude 19.27 (0.05)
E(B-V) 0.023

* 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.