WD 1659+617

All names: SDSS J165938.54+614101.2, SDSS J165938.54+614101.20, Gaia DR3 1630480704956484480, Gaia EDR3 1630480704956484480, WD 1659+617, SDSS J165938.53+614101.2, SDSS J165938.54+614101.1, GALEX J165938.6+614100, SDSS J165938.53+614101.1, Gaia DR2 1630480704956484480

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 Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 16 59 38.66 (0.08) 16 59 38.54 16 59 38.66 (0.1) 16 59 38.66 16 59 38.55 (0.08) 16 59 38.54 16 59 37.94 16 59 38.54
Declination 61 40 59.81 (0.08) 61 41 01.18 61 40 59.85 (0.1) 61 40 59.81 61 41 01.20 (0.08) 61 41 01.19 61 40 55.92 61 41 01.18
Spectral type DB DB DB4.5 DB DB3.5 DB DB
Effective temperature [K] 12617.0 12623.0 12031.0 12852.0 (71) 12331.0 (294) 14850.0 (83) 13823.0 (178)
log(g) [cgs] 7.72 8.06 8.00 8.00 (0) 8.04 (0.03) 8.99 (0.01) 8.74 (0.1)
Mass [M] 0.436 0.62 0.587 0.608 (0.03)
log(Luminosity) [L]
Cooling age [Gyr] 0.3823
log(H/He) <-6.555 <-5.87
log(C/He)
log(Ca/He) <-9.56
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] 6.68 (0.08) 6.71 (0.1) 6.68 6.68 (0.08)
Distance [pc] 149.77 (2) 149.03 (3) 155.00 149.77 149.77 (2)
Composition He
Proper motion (right ascension) [mas/yr] 48.9296603 (0.1) 49.27330635 (0.2) 48.93 (0.1) 50.1
Proper motion (declination) [mas/yr] -87.01290884 (0.1) -87.37580877 (0.2) -87.013 (0.1) -91.9
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 17.53 (0.009) 17.53 (0.009) 17.53 (0.02) 17.53 17.54 (0.02)
g magnitude 17.50 (0.005) 17.50 (0.005) 17.51 (0.02) 17.50 17.52 (0.02)
r magnitude 17.76 (0.006) 17.76 (0.006) 17.78 (0.02) 17.76 17.77 (0.02)
i magnitude 17.97 (0.008) 17.97 (0.008) 17.98 (0.02) 17.98 17.99 (0.02)
z magnitude 18.08 (0.02) 18.08 (0.02) 18.07 (0.04) 18.07 18.07 (0.04)
G magnitude 17.65 (0.008) 17.68 17.65 17.65 (0.003)
BP magnitude 17.66 (0.008) 17.64
RP magnitude 17.69 (0.01) 17.65
Pan g magnitude 17.61 (0.004)
Pan r magnitude 17.79 (0.004)
Pan i magnitude 17.99 (0.005)
Pan z magnitude 18.17 (0.008)
Pan y magnitude 18.32 (0.03)
E(B-V) 0.016

* 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.