SDSS J174025.00+245704.5

All names: Gaia DR3 4581688351925836928, SDSS J174024.99+245704.4, SDSS J174025.00+245704.5, LAMOST J174024.99+245704.4, Gaia DR2 4581688351925836928, SDSS J174025.00+245704.50, GALEX J174024.9+245703, Gaia EDR3 4581688351925836928

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Guo et al. 2015 Koester & Kepler 2015 Vincent et al. 2024 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 17 40 24.99 (0.05) 17 40 25.00 17 40 25.00 (0.06) 17 40 24.99 17 40 25.00 (0.05) 17 40 25.00
Declination 24 57 04.50 (0.06) 24 57 04.48 24 57 04.49 (0.08) 24 57 04.50 24 57 04.44 (0.06) 24 57 04.48
Spectral type DBAH: DB;DBAH? DB DBAH DBAH: DB
Effective temperature [K] 17997.0 15694.0 16948.0 20444.0 (144) 18774.0 (792) 19726.0 (1119)
log(g) [cgs] 8.31 7.74 7.87 8.33 (0.04) 8.02 (0.04) 8.33 (0.05)
Mass [M] 0.788 0.456 0.52 0.604 (0.04)
log(Luminosity) [L]
Cooling age [Gyr] 0.1040
log(H/He) -4.065 -3.31 (0.2)
log(C/He)
log(Ca/He) <-4.54
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] 4.28 (0.08) 4.20 (0.1) 4.28 4.28 (0.08)
Distance [pc] 233.70 (4) 238.03 (6) 196.00 233.70 233.69 (4)
Composition He
Proper motion (right ascension) [mas/yr] -3.719058955 (0.07) -3.80531721 (0.1) -3.719 (0.07)
Proper motion (declination) [mas/yr] 3.658189443 (0.07) 3.439054483 (0.2) 3.658 (0.07)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 17.54 (0.01) 17.54 (0.01) 17.40 (0.02)
g magnitude 17.52 (0.006) 17.52 (0.006) 17.52 (0.01)
r magnitude 17.83 (0.007) 17.83 (0.007) 17.84 (0.01)
i magnitude 18.09 (0.008) 18.09 (0.008) 18.13 (0.01)
z magnitude 18.35 (0.03) 18.35 (0.03) 18.36 (0.03)
G magnitude 17.66 (0.006) 17.69 17.66 17.66 (0.003)
BP magnitude 17.58 (0.006) 17.55
RP magnitude 17.81 (0.01) 17.81
Pan g magnitude 17.55 (0.007)
Pan r magnitude 17.84 (0.004)
Pan i magnitude 18.12 (0.004)
Pan z magnitude 18.37 (0.01)
Pan y magnitude 18.53 (0.02)
E(B-V) 0.031

* 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.