USNO-A2.0 1125-05712259

All names: GALEX J084244.9+295444, Gaia EDR3 706265418586653056, Gaia DR3 706265418586653056, SDSS J084244.93+295444.40, LAMOST J084244.92+295444.3, USNO-A2.0 1125-05712259, WD 0839+300, Gaia DR2 706265418586653056, SDSS J084244.92+295444.3, SDSS J084244.93+295444.4

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Simbad Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 08 42 44.92 (0.2) 08 42 44.93 08 42 44.92 (0.3) 08 42 44.92 (0.2) 08 42 44.93 08 42 45.17 08 42 44.93
Declination 29 54 44.18 (0.1) 29 54 44.33 29 54 44.19 (0.2) 29 54 44.37 (0.1) 29 54 44.35 29 54 41.76 29 54 44.35
Spectral type DB DB DB DB DB DB
Effective temperature [K] 16808.0 17496.0 14062.0 16987.0 (200) 16722.0 (227)
log(g) [cgs] 8.04 8.55 8.31 8.16 (0.1) 8.14 (0.1)
Mass [M] 0.614 0.944 0.782 0.669 (0.09)
log(Luminosity) [L]
Cooling age [Gyr] 0.4045
log(H/He) <-5.8
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] 2.89 (0.3) 3.57 (0.4) 2.89 (0.3)
Distance [pc] 345.76 (30) 280.25 (33) 345.76 (30)
Composition He
Proper motion (right ascension) [mas/yr] 0.23942966 (0.3) 0.530050289 (0.6) 0.239 (0.3) -5.0
Proper motion (declination) [mas/yr] -11.51930215 (0.2) -11.73633506 (0.5) -11.519 (0.2) -2.0
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 18.50 (0.3)
V magnitude
R magnitude 18.90 (0.3)
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 18.89 (0.02) 18.89 (0.02) 18.90 (0.02) 18.89 18.90 (0.02)
g magnitude 18.96 (0.009) 18.96 (0.009) 18.99 (0.02) 18.98 18.99 (0.02)
r magnitude 19.25 (0.01) 19.25 (0.01) 19.25 (0.02) 19.24 19.26 (0.02)
i magnitude 19.52 (0.02) 19.52 (0.02) 19.53 (0.03) 19.52 19.54 (0.03)
z magnitude 19.98 (0.1) 19.98 (0.1) 19.98 (0.1) 19.97 19.98 (0.09)
G magnitude 19.14 (0.03) 19.18 19.14 (0.004)
BP magnitude 19.10 (0.03) 19.00
RP magnitude 19.33 (0.06) 19.17
Pan g magnitude 19.01 (0.01)
Pan r magnitude 19.30 (0.01)
Pan i magnitude 19.55 (0.02)
Pan z magnitude 19.72 (0.02)
Pan y magnitude 19.83 (0.04)
E(B-V) 0.020

* 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.