US 846

All names: Gaia EDR3 820840165198320640, US 846, WD 0938+444, Gaia DR3 820840165198320640, LAMOST J094138.07+441458.2, GALEX J094138.1+441458, SDSS J094138.09+441457.7, J0941+4414, SDSS J094138.08+441458.2, SDSS J094138.07+441458.2, Gaia DR2 820840165198320640

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Coutu et al. 2019 Gaia DR2 Stilism Koester et al. 2006 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 09 41 38.04 (0.1) 09 41 38.08 09 41 38.08 09 41 38.04 (0.1) 09 41 38.04 09 41 38.08 (0.1) 09 41 38.07 09 41 38.21 09 41 38.08
Declination 44 14 56.95 (0.1) 44 14 58.26 44 14 58.36 44 14 56.99 (0.1) 44 14 56.95 44 14 58.36 (0.1) 44 14 58.23 44 14 54.96 44 14 58.23
Spectral type DQ DQ DQ DQ DQ: DQ: DQ: DQ
Effective temperature [K] 8222.0 (203) 8113.0 7896.0 (137) 10086.0 (16) 10086.0 (16)
log(g) [cgs] 7.98 8.00 (0) 7.94 (0.04) 7.72 (0.5) 8.00 (0.8)
Mass [M] 0.567 0.542 (0.03)
log(Luminosity) [L]
Cooling age [Gyr] 1.0200
log(H/He)
log(C/He) -5.2231 (0.07) -5.42 (0.06)
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] 7.62 (0.2) 7.43 7.43 (0.3) 7.62 7.62 (0.2)
Distance [pc] 131.30 (3) 134.54 (5) 134.54 (5) 131.30 131.30 (3)
Composition He He
Proper motion (right ascension) [mas/yr] -27.65470489 (0.1) -27.80047765 (0.3) -27.655 (0.1) 14.5
Proper motion (declination) [mas/yr] -88.37878863 (0.1) -88.1087716 (0.3) -88.379 (0.1) -56.9
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 18.60
V magnitude 18.65
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 18.88 (0.02) 18.88 (0.02) 18.91 (0.02) 18.91 18.88 (0.02)
g magnitude 18.65 (0.008) 18.65 (0.008) 18.68 (0.02) 18.67 18.67 (0.02)
r magnitude 18.65 (0.009) 18.65 (0.009) 18.66 (0.02) 18.65 18.66 (0.02)
i magnitude 18.74 (0.01) 18.74 (0.01) 18.74 (0.02) 18.73 18.74 (0.02)
z magnitude 18.91 (0.03) 18.91 (0.03) 18.90 (0.04) 18.89 18.91 (0.04)
G magnitude 18.60 (0.02) 18.63 18.60 18.60 (0.003)
BP magnitude 18.71 (0.02) 18.67
RP magnitude 18.44 (0.02) 18.42
Pan g magnitude 18.68 (0.02)
Pan r magnitude 18.66 (0.008)
Pan i magnitude 18.76 (0.005)
Pan z magnitude 18.84 (0.03)
Pan y magnitude 18.91 (0.04)
E(B-V) 0.006

* 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.