WD 1647+389

All names: Gaia DR3 1352454105947876992, WD 1647+389, SDSS J164936.08+385048.2, Gaia DR2 1352454105947876992, SDSS J164936.08+385048.20, SDSS J164936.08+385048.1, USNO-A2.0 1275-09077867, Gaia EDR3 1352454105947876992, GALEX J164936.1+385048

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism 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 49 36.08 (0.2) 16 49 36.08 16 49 36.08 (0.2) 16 49 36.08 16 49 36.08 (0.2) 16 49 36.09 16 49 35.47 16 49 36.08
Declination 38 50 48.17 (0.2) 38 50 48.23 38 50 48.17 (0.3) 38 50 48.17 38 50 48.19 (0.2) 38 50 48.18 38 50 47.40 38 50 48.16
Spectral type DB DB DB DB DB2.8 DB DB
Effective temperature [K] 17064.0 17601.0 15270.0 19118.0 (2408) 17482.0 (285) 17703.0 (386)
log(g) [cgs] 7.77 8.16 7.96 8.04 (0.2) 7.79 (0.2) 7.87 (0.2)
Mass [M] 0.471 0.689 0.569 0.62 (0.1) 0.52 (0.08)
log(Luminosity) [L]
Cooling age [Gyr] 0.1766
log(H/He) <-5.626
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] 2.18 (0.2) 2.52 (0.3) 2.18 2.18 (0.2)
Distance [pc] 458.66 (42) 397.46 (45) 458.66 458.65 (42)
Composition He
Proper motion (right ascension) [mas/yr] -5.039603477 (0.2) -5.496148887 (0.4) -5.04 (0.2) 0.8
Proper motion (declination) [mas/yr] -1.293240501 (0.2) -2.590954817 (0.6) -1.293 (0.2) -7.1
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 18.00 (0.3)
V magnitude
R magnitude 18.70 (0.3)
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 18.94 (0.02) 18.94 (0.02) 18.95 (0.02) 18.96 18.93 (0.02)
g magnitude 19.00 (0.009) 19.00 (0.009) 19.02 (0.01) 19.02 19.01 (0.01)
r magnitude 19.36 (0.01) 19.36 (0.01) 19.34 (0.02) 19.34 19.34 (0.02)
i magnitude 19.61 (0.02) 19.61 (0.02) 19.62 (0.02) 19.61 19.62 (0.02)
z magnitude 19.82 (0.09) 19.82 (0.09) 19.85 (0.09) 19.85 19.84 (0.09)
G magnitude 19.17 (0.02) 19.23 19.17 19.17 (0.004)
BP magnitude 19.15 (0.02) 19.13
RP magnitude 19.31 (0.04) 19.31
Pan g magnitude 19.05 (0.007)
Pan r magnitude 19.34 (0.01)
Pan i magnitude 19.61 (0.01)
Pan z magnitude 19.82 (0.02)
Pan y magnitude 19.83 (0.06)
E(B-V) 0.021

* 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.