WD 1649+408

All names: SDSS J165057.16+404327.3, Gaia DR3 1353262629247389312, SDSS J165057.15+404327.3, SDSS J165057.15+404327.2, Gaia DR2 1353262629247389312, Gaia EDR3 1353262629247389312, WD 1649+408, SDSS J165057.16+404327.2, SDSS J165057.16+404327.30, GALEX J165057.1+404327

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 50 57.15 (0.08) 16 50 57.16 16 50 57.15 (0.09) 16 50 57.15 16 50 57.16 (0.08) 16 50 57.16 16 50 56.83 16 50 57.16
Declination 40 43 27.11 (0.08) 40 43 27.27 40 43 27.12 (0.1) 40 43 27.11 40 43 27.37 (0.08) 40 43 27.29 40 43 23.16 40 43 27.30
Spectral type DB DB DB DB DB2.6 DB DB
Effective temperature [K] 19095.0 18566.0 17754.0 18855.0 (134) 21026.0 (1302) 19414.0 (194) 20040.0 (486)
log(g) [cgs] 8.27 8.09 8.03 8.13 (0.06) 8.20 (0.05) 8.27 (0.05) 8.22 (0.05)
Mass [M] 0.764 0.649 0.61 0.72 (0.04) 0.725 (0.03)
log(Luminosity) [L]
Cooling age [Gyr] 0.1183
log(H/He) -5.008 <-4.54
log(C/He)
log(Ca/He) <-5.04
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] 4.21 (0.09) 4.22 (0.1) 4.21 4.21 (0.09)
Distance [pc] 237.67 (5) 236.72 (6) 230.00 237.67 237.67 (5)
Composition He
Proper motion (right ascension) [mas/yr] -2.038323675 (0.1) -1.726011832 (0.2) -2.038 (0.1) -0.8
Proper motion (declination) [mas/yr] -15.74980056 (0.1) -15.31597588 (0.2) -15.75 (0.1) -17.1
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 17.52 (0.01) 17.52 (0.01) 17.50 (0.03) 17.50 17.51 (0.03)
g magnitude 17.65 (0.005) 17.65 (0.005) 17.65 (0.02) 17.65 17.65 (0.02)
r magnitude 17.98 (0.007) 17.98 (0.007) 18.00 (0.02) 18.00 17.99 (0.02)
i magnitude 18.24 (0.009) 18.24 (0.009) 18.25 (0.02) 18.24 18.24 (0.02)
z magnitude 18.55 (0.03) 18.55 (0.04) 18.48 (0.03) 18.48 18.48 (0.03)
G magnitude 17.79 (0.01) 17.82 17.79 17.79 (0.003)
BP magnitude 17.71 (0.01) 17.67
RP magnitude 17.96 (0.02) 17.94
Pan g magnitude 17.66 (0.005)
Pan r magnitude 17.98 (0.006)
Pan i magnitude 18.26 (0.004)
Pan z magnitude 18.50 (0.01)
Pan y magnitude 18.64 (0.02)
E(B-V) 0.019

* 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.