SDSS J083056.94+253853.7

All names: SDSS J083056.94+253853.8, SDSS J083056.94+253853.7, SDSS J083056.93+253853.7, WD 0827+258, Gaia DR3 678906270753221248, SDSS J083056.94+253853.80, Gaia EDR3 678906270753221248, Gaia DR2 678906270753221248

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Simbad Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 08 30 56.93 (0.3) 08 30 56.94 08 30 56.93 (0.4) 08 30 56.94 (0.3) 08 30 56.94 08 30 56.33 08 30 56.94
Declination 25 38 53.43 (0.2) 25 38 53.74 25 38 53.45 (0.2) 25 38 53.82 (0.2) 25 38 53.78 25 38 51.72 25 38 53.77
Spectral type DB DB DB DB DB DB
Effective temperature [K] 18083.0 19098.0 13712.0 16922.0 (136) 17891.0 (356) 17482.0 (206)
log(g) [cgs] 8.26 8.21 7.82 7.74 (0.09) 8.01 (0.2) 8.05 (0.09)
Mass [M] 0.755 0.727 0.488 0.617 (0.05)
log(Luminosity) [L]
Cooling age [Gyr] 0.2010
log(H/He) <-5.658 <-4.78
log(C/He)
log(Ca/He) <-6.01
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] 1.85 (0.4) 2.27 (0.5) 1.85 (0.4)
Distance [pc] 540.41 (113) 440.27 (101) 535.00 540.39 (113)
Composition He
Proper motion (right ascension) [mas/yr] -11.7674574 (0.3) -10.56509547 (0.8) -11.767 (0.3) -6.8
Proper motion (declination) [mas/yr] -24.00528676 (0.3) -24.88923717 (0.5) -24.005 (0.3) -24.2
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 19.26 (0.03) 19.26 (0.03) 19.30 (0.03) 19.29 19.27 (0.03)
g magnitude 19.27 (0.01) 19.27 (0.01) 19.34 (0.02) 19.34 19.34 (0.02)
r magnitude 19.59 (0.02) 19.59 (0.02) 19.61 (0.02) 19.61 19.60 (0.02)
i magnitude 19.84 (0.03) 19.84 (0.03) 19.85 (0.03) 19.85 19.85 (0.03)
z magnitude 19.94 (0.1) 19.94 (0.1) 20.06 (0.1) 20.06 20.05 (0.1)
G magnitude 19.44 (0.03) 19.50 19.44 (0.004)
BP magnitude 19.41 (0.03) 19.27
RP magnitude 19.50 (0.05) 19.40
Pan g magnitude 19.33 (0.007)
Pan r magnitude 19.60 (0.009)
Pan i magnitude 19.86 (0.02)
Pan z magnitude 20.05 (0.03)
Pan y magnitude 20.05 (0.04)
E(B-V) 0.029

* 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.