GD 401

All names: Gaia DR3 1956838712685820544, LP 287-40, WD 2215+388, NLTT 53447, NLTT 53467, WDJ221801.14+390843.88, Gaia EDR3 1956838712685820544, GD 401, LSPM J2218+3908, EGGR 451, GALEX J221801.1+390842, USNO-B1.0 1291-00493338, J2218+3908, TIC 119996731, 2MASS J22180114+3908444, WIRED J221801.08+390842.5, SDSS J221801.08+390842.5, Gaia DR2 1956838712683591296, WD 2215+386

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Caron et al. 2023 Coutu et al. 2019 MWDD H MWDD HE Gaia DR2 Stilism Holberg et al. 2016 Sion et al. 2014 Sion et al. 1990 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 22 18 00.99 (0.03) 22 18 01.08 22 18 01.14 22 18 00.99 (0.03) 22 17 47.52 22 18 00.99 22 18 01.14 (0.03) 22 18 00.99 22 18 02.23 22 18 01.08
Declination 39 08 40.53 (0.03) 39 08 42.56 39 08 43.88 39 08 40.64 (0.04) 37 07 48.00 39 08 40.53 39 08 43.88 (0.03) 39 08 40.64 39 08 50.64 39 08 42.52
Spectral type DZ DZ DC DC10.6 DZA? DZ DZ5 DZ DZ5 DZ DZ
Effective temperature [K] 8354.0 (24) 8914.0 (199) 9743.0 9590.0 4993.0 (192) 4700.0 8800.0 8154.0 (34) 10196.0 (126)
log(g) [cgs] 8.00 (0.005) 8.21 8.32 8.24 8.00 (0) 7.89 (0.007) 9.55 (0.3)
Mass [M] 0.576 (0.004) 0.7068 0.8 0.734 0.58 (0) 0.513 (0.006)
log(Luminosity) [L]
Cooling age [Gyr] 1.0400 1.1400 1.0450 0.9889 5.7200
log(H/He) -4.0 <-5.3407
log(C/He)
log(Ca/He) -8.72 -8.3356 (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] 20.76 (0.05) 20.72 (0.05) 20.72 20.72 (0.05) 39.80 (5) 20.76 20.76 (0.05) 20.72 (0.05)
Distance [pc] 48.17 (0.1) 48.26 (0.1) 48.27 (0.1) 48.27 (0.1) 25.13 (3) 25.12 48.17 48.17 (0.1) 48.27 (0.1)
Composition He He H
Proper motion (right ascension) [mas/yr] -110.6080182 (0.03) -110.6287379 (0.06) -110.608 (0.03) -110.629
Proper motion (declination) [mas/yr] -209.5502943 (0.04) -209.4754704 (0.09) -209.55 (0.04) -209.475
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 16.00
V magnitude 16.99
R magnitude 16.20
I magnitude
J magnitude 16.09 (0.01) 16.14 (0.1)
H magnitude
K magnitude
u magnitude 16.55 (0.006) 16.55 (0.006) 16.55 (0.006) 16.55 (0.006) 16.53 (0.01)
g magnitude 16.20 (0.003) 16.20 (0.003) 16.20 (0.003) 16.21 (0.01)
r magnitude 16.23 (0.004) 16.23 (0.004) 16.23 (0.004) 16.20 (0.01)
i magnitude 16.36 (0.004) 16.36 (0.004) 16.36 (0.004) 16.34 (0.01)
z magnitude 16.50 (0.009) 16.50 (0.009) 16.50 (0.009) 16.52 (0.02)
G magnitude 16.17 (0.002) 16.18 16.17 16.17 (0.003) 16.18
BP magnitude 16.24 (0.002) 16.25 16.25
RP magnitude 16.04 (0.002) 16.05 16.05
Pan g magnitude 16.19 (0.002) 16.19 (0.002)
Pan r magnitude 16.23 (0.002) 16.23 (0.002)
Pan i magnitude 16.38 (0.002) 16.38 (0.002)
Pan z magnitude 16.55 (0.004) 16.55 (0.004)
Pan y magnitude 16.61 (0.005) 16.61 (0.004)
E(B-V) 0.005

* 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.