GALEX 2680391675338031787

All names: SDSS J172856.21+325045.6, USNO-A2.0 1200-08425944, Gaia DR2 4601940290956951424, Gaia EDR3 4601940290956951424, J1728+3250, GALEX 2680391675338031787, SDSS J172856.20+325045.6, Gaia DR3 4601940290956951424

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Coutu et al. 2019 Gaia DR2 Stilism Koester & Kepler 2015 Vincent et al. 2024 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 17 28 56.23 (0.09) 17 28 56.21 17 28 56.20 17 28 56.23 (0.1) 17 28 56.23 17 28 56.20 (0.1) 17 28 56.21
Declination 32 50 45.09 (0.1) 32 50 45.64 32 50 45.77 32 50 45.11 (0.1) 32 50 45.09 32 50 45.77 (0.1) 32 50 45.60
Spectral type DBZ DB DBZH+M DBZHM DB
Effective temperature [K] 12123.0 (496) 13709.0 (68) 13421.0 (511) 13961.0 (124)
log(g) [cgs] 7.87 8.00 (0) 8.05 (0.05) 8.44 (0.09)
Mass [M] 0.512 0.616 (0.04)
log(Luminosity) [L]
Cooling age [Gyr] 0.3120
log(H/He) <-6.1156 <-5.79
log(C/He)
log(Ca/He) -9.0082 (0.2) -8.14 (0.1)
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] 4.38 (0.1) 4.33 4.33 (0.2) 4.38 4.33 (0.2)
Distance [pc] 228.16 (6) 230.81 (8) 230.81 (8) 242.00 228.16 230.81 (8)
Composition He
Proper motion (right ascension) [mas/yr] 17.85960294 (0.1) 17.7461938 (0.2) 17.746 (0.2)
Proper motion (declination) [mas/yr] -42.32841777 (0.1) -42.38517538 (0.3) -42.385 (0.3)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 17.60 (0.3)
V magnitude
R magnitude 18.30 (0.3)
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 18.34 (0.02) 18.34 (0.01) 18.37 (0.02)
g magnitude 18.32 (0.007) 18.32 (0.007) 18.37 (0.01)
r magnitude 18.57 (0.009) 18.57 (0.009) 18.59 (0.01)
i magnitude 18.77 (0.01) 18.77 (0.01) 18.76 (0.02)
z magnitude 18.92 (0.04) 18.92 (0.04) 18.99 (0.04)
G magnitude 18.41 (0.01) 18.44 18.41 18.44 (0.002)
BP magnitude 18.39 (0.01) 18.35
RP magnitude 18.47 (0.02) 18.39
Pan g magnitude 18.34 (0.007)
Pan r magnitude 18.55 (0.007)
Pan i magnitude 18.74 (0.007)
Pan z magnitude 18.98 (0.01)
Pan y magnitude 19.20 (0.07)
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.