Gaia DR2 2185261016407220224

All names: J2021+5454, Gaia DR2 2185261016407220224, TIC 365099333, 2MASS J20215780+5454378, Gaia DR3 2185261016407220224, WDJ202157.83+545438.25, Gaia EDR3 2185261016407220224

Parameter Unit Gaia EDR3 Pan-STARRS DR1 O'Brien et al. 2024 Caron et al. 2023 McCleery et al. 2020 Tremblay et al. 2020 MWDD H MWDD HE Gaia DR2 Stilism Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018
Right ascension 20 21 57.94 (0.05) 20 21 57.94 (0.07) 20 21 57.94 20 21 57.94 20 21 57.83 (0.05) 20 21 57.94
Declination 54 54 42.36 (0.05) 54 54 42.23 (0.07) 54 54 42.23 54 54 42.36 54 54 38.25 (0.05) 54 54 42.23
Spectral type DC DC DC DC DA DC
Effective temperature [K] 5967.0 (54) 5821.0 (25) 5937.1 (56) 5940.0 (60) 6084.0 5828.0 6228.0 (41)
log(g) [cgs] 8.18 (0.03) 8.12 (0.009) 8.18 (0.03) 8.18 (0.03) 8.27 8.13 8.32 (0.01)
Mass [M] 0.683 (0.02) 0.649 (0.008) 0.76 0.651 0.793 (0.01)
log(Luminosity) [L]
Cooling age [Gyr] 4.1100 3.9980 3.9910
log(H/He)
log(C/He)
log(Ca/He)
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] 26.35 (0.05) 26.35 (0.05) 26.30 (0.08) 26.30 (0.08) 26.30 (0.08) 26.35 26.35 (0.05) 26.30 (0.08)
Distance [pc] 37.96 (0.08) 37.95 (0.07) 38.02 (0.1) 38.02 (0.1) 38.02 (0.1) 37.96 37.96 (0.08) 38.02 (0.1)
Composition He He
Proper motion (right ascension) [mas/yr] 59.045201 (0.06) 59.21616181 (0.2) 59.045 (0.06) 59.21616181
Proper motion (declination) [mas/yr] 256.8106322 (0.06) 256.7676457 (0.1) 256.811 (0.06) 256.7676457
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude 16.36 (0.1) 16.36 (0.1)
H magnitude
K magnitude
u magnitude
g magnitude
r magnitude
i magnitude
z magnitude
G magnitude 17.24 (0.005) 17.25 17.25 17.24 17.24 (0.003) 17.25
BP magnitude 17.52 (0.005) 17.52 17.52
RP magnitude 16.79 (0.005) 16.80 16.80
Pan g magnitude 17.57 (0.006) 17.57 (0.005)
Pan r magnitude 17.25 (0.001) 17.25 (0.0008)
Pan i magnitude 17.14 (0.003) 17.14 (0.003)
Pan z magnitude 17.14 (0.005) 17.14 (0.006)
Pan y magnitude 17.14 (0.01) 17.14 (0.01)
E(B-V) 0.003

* 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.