SDSS J144022.52-023222.2

All names: NLTT 38038, Gaia DR2 3648790157806712448, LP 620-50, SDSS J144022.52-023222.2, Gaia EDR3 3648790157806712448, J1440-0232, SDSS J144022.53-023222.2, Gaia DR3 3648790157806712448, WD 1437-023

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Kilic et al. 2025 Caron et al. 2023 Coutu et al. 2019 Gaia DR2 Stilism Dufour et al. 2007 Vincent et al. 2024 Simbad Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 14 40 22.31 (0.2) 14 40 22.52 14 40 22.52 14 40 22.31 (0.2) 14 40 22.31 14 40 22.55 (0.2) 14 40 22.52 14 40 22.58 14 40 22.53
Declination -02 32 22.06 (0.1) -02 32 22.23 -02 32 22.23 -02 32 22.07 (0.2) -02 32 22.06 -02 32 22.26 (0.1) -02 32 22.24 -02 32 20.40 -02 32 22.24
Spectral type DZ DZ DZ DZ DZ DZ DZ DZ DZ DZ
Effective temperature [K] 6645.0 (56) 6704.0 (55) 6719.0 (173) 6860.0 (80) 6797.0 (181) 10090.0 (22) 10092.0 (24)
log(g) [cgs] 7.92 (0.02) 7.92 (0.03) 7.96 8.00 8.00 (0.05) 8.50 (0.5) 9.50 (0.4)
Mass [M] 0.525 (0.02) 0.53 (0.02) 0.5479 0.573 (0.04)
log(Luminosity) [L]
Cooling age [Gyr] 1.6400 1.6200
log(H/He) -3.0 -3.0 <-3.6815 -3.25 (0.5)
log(C/He)
log(Ca/He) -10.51 -10.49 -10.5568 (0.09) -10.44 (0.2)
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] 10.08 (0.2) 9.98 (0.2) 9.98 9.98 (0.2) 10.08 10.08 (0.2)
Distance [pc] 99.25 (2) 100.20 (2) 100.21 (2) 100.21 (2) 100.00 99.25 99.25 (2)
Composition He He He
Proper motion (right ascension) [mas/yr] -227.8875354 (0.2) -227.8480916 (0.4) -227.888 (0.2)
Proper motion (declination) [mas/yr] 12.57519888 (0.2) 12.86088129 (0.3) 12.575 (0.2)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude 18.49
R magnitude
I magnitude
J magnitude 18.04 (0.06)
H magnitude 17.93 (0.09)
K magnitude
u magnitude 19.25 (0.03) 19.20 (0.03) 19.25 (0.03) 19.23 (0.03) 19.23 19.22 (0.03)
g magnitude 18.68 (0.008) 18.68 (0.008) 18.70 (0.03) 18.69 18.69 (0.03)
r magnitude 18.55 (0.009) 18.55 (0.009) 18.54 (0.04) 18.53 18.53 (0.04)
i magnitude 18.55 (0.01) 18.55 (0.01) 18.49 (0.06) 18.48 18.49 (0.06)
z magnitude 18.62 (0.03) 18.61 (0.04) 18.58 (0.2) 18.57 18.58 (0.2)
G magnitude 18.49 (0.03) 18.51 18.49 18.49 (0.004)
BP magnitude 18.62 (0.03) 18.67
RP magnitude 18.20 (0.02) 18.22
Pan g magnitude 18.64 (0.009) 18.64 (0.009)
Pan r magnitude 18.51 (0.006) 18.51 (0.006)
Pan i magnitude 18.51 (0.007) 18.51 (0.007)
Pan z magnitude 18.58 (0.005) 18.58 (0.005)
Pan y magnitude 18.63 (0.02) 18.63 (0.02)
E(B-V) 0.018

* 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.