Gaia DR2 909928404076399744

All names: WDJ084046.24+371422.78, GALEX J084046.2+371422, USNO-B1.0 1272-00204846, Gaia DR3 909928404076399744, [VV2010b] J084046.3+371422, SDSS J084046.24+371422.8, SDSS J084046.23+371422.8, [VV2006b] J084046.3+371422, Gaia EDR3 909928404076399744, J0840+3714, WISE J084046.33+371422.1, Gaia DR2 909928404076399744

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Kilic et al. 2025 Caron et al. 2023 MWDD H MWDD HE Gaia DR2 Stilism Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 Vincent et al. 2023
Right ascension 08 40 46.22 (0.2) 08 40 46.23 08 40 46.22 08 40 46.24 (0.2) 08 40 46.23
Declination 37 14 22.84 (0.1) 37 14 22.84 37 14 22.84 37 14 22.78 (0.1) 37 14 22.84
Spectral type DC DC DC DC DC
Effective temperature [K] 6136.0 (42) 5948.0 (46) 6614.0 6362.0 5912.0 (189)
log(g) [cgs] 8.08 (0.02) 8.02 (0.03) 8.33 8.22 8.12 (0.04)
Mass [M] 0.622 (0.02) 0.585 (0.02) 0.804 0.71 0.644 (0.04)
log(Luminosity) [L]
Cooling age [Gyr] 2.8400 3.5480 3.3830
log(H/He) -3.0 -3.0
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] 13.26 (0.2) 13.34 (0.3) 13.34 (0.3) 13.26 13.26 (0.2) 13.34 (0.3)
Distance [pc] 75.39 (1) 74.96 (2) 74.98 (2) 75.39 75.39 (1) 74.98 (2)
Composition He
Proper motion (right ascension) [mas/yr] -13.56516601 (0.2) -13.92164105 (0.5) -13.565 (0.2) -13.92164105
Proper motion (declination) [mas/yr] 3.890360494 (0.2) 3.585267281 (0.4) 3.89 (0.2) 3.585267281
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 18.50
V magnitude 18.64
R magnitude 18.30
I magnitude
J magnitude 17.88 (0.04)
H magnitude
K magnitude
u magnitude 19.44 (0.03) 19.45 (0.03) 19.45 (0.03)
g magnitude 18.78 (0.008) 18.78 (0.008)
r magnitude 18.49 (0.008) 18.49 (0.008)
i magnitude 18.46 (0.01) 18.46 (0.01)
z magnitude 18.42 (0.03) 18.42 (0.03)
G magnitude 18.50 (0.02) 18.53 18.50 18.50 (0.003) 18.53
BP magnitude 18.73 (0.02) 18.74 18.74
RP magnitude 18.14 (0.02) 18.10 18.10
Pan g magnitude 18.74 (0.008) 18.74 (0.007)
Pan r magnitude 18.50 (0.007) 18.50 (0.005)
Pan i magnitude 18.45 (0.004) 18.45 (0.005)
Pan z magnitude 18.48 (0.007) 18.48 (0.008)
Pan y magnitude 18.51 (0.01) 18.51 (0.01)
E(B-V) 0.002

* 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.