Gaia DR2 1839493604790492032

All names: WDJ205756.66+231654.55, SDSS J205756.71+231655.5, Gaia DR3 1839493604790492032, SDSS J205756.72+231655.6, Gaia DR2 1839493604790492032, GALEX J205756.7+231655, LSPM J2057+2316, Gaia EDR3 1839493604790492032, J2057+2316, USNO-B1.0 1132-00554551

Parameter Unit Gaia EDR3 Pan-STARRS DR1 Kilic et al. 2025 Caron et al. 2023 Kilic et al. 2020 MWDD H MWDD HE Gaia DR2 Stilism Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018
Right ascension 20 57 56.80 (0.1) 20 57 56.79 20 57 56.80 20 57 56.66 (0.1) 20 57 56.79
Declination 23 16 57.06 (0.09) 23 16 56.98 23 16 57.06 23 16 54.55 (0.09) 23 16 56.98
Spectral type DC DC DC DZ DC
Effective temperature [K] 6300.0 (42) 5393.0 (26) 5974.0 (42) 7676.0 7403.0 6605.0 (103)
log(g) [cgs] 8.07 (0.02) 7.66 (0.02) 7.90 (0.03) 8.49 8.41 8.20 (0.03)
Mass [M] 0.618 (0.02) 0.388 (0.01) 0.515 (0.02) 0.911 0.84 0.698 (0.03)
log(Luminosity) [L]
Cooling age [Gyr] 2.4800 3.0620 2.9740
log(H/He) -5.0 -3
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] 12.62 (0.2) 12.70 (0.2) 12.70 (0.2) 12.62 12.62 (0.2) 12.70 (0.2)
Distance [pc] 79.25 (1) 78.74 (1) 78.77 (1) 79.25 79.25 (1) 78.77 (1)
Composition He He
Proper motion (right ascension) [mas/yr] 113.078701 (0.2) 112.7657228 (0.4) 113.079 (0.2) 112.7657228
Proper motion (declination) [mas/yr] 156.8394972 (0.1) 156.8092016 (0.3) 156.839 (0.1) 156.8092016
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 17.80
V magnitude
R magnitude 16.80
I magnitude
J magnitude 17.90 (0.04)
H magnitude
K magnitude
u magnitude 19.61 (0.04) 19.62 (0.04) 19.62 (0.04)
g magnitude 18.50 (0.008) 18.50 (0.008)
r magnitude 18.29 (0.008) 18.29 (0.008)
i magnitude 18.33 (0.01) 18.33 (0.01)
z magnitude 18.43 (0.03) 18.43 (0.03)
G magnitude 18.34 (0.02) 18.36 18.34 18.34 (0.003) 18.36
BP magnitude 18.52 (0.02) 18.52 18.52
RP magnitude 18.08 (0.02) 18.05 18.05
Pan g magnitude 18.48 (0.005) 18.48 (0.006)
Pan r magnitude 18.35 (0.006) 18.35 (0.005)
Pan i magnitude 18.40 (0.003) 18.40 (0.003)
Pan z magnitude 18.48 (0.007) 18.48 (0.007)
Pan y magnitude 18.51 (0.03) 18.51 (0.03)
E(B-V) 0.007

* 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.