SDSS J205440.40+154816.5

All names: SDSS J205440.39+154816.5, Gaia EDR3 1764287421766301312, Gaia DR2 1764287421766301312, SDSS J205440.40+154816.5, Gaia DR3 1764287421766301312, GALEX J205440.3+154816

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Bedard et al. 2020 MWDD H Gaia DR2 Stilism Vincent et al. 2024 Simbad Kleinman et al. 2013 Vincent et al. 2023
Right ascension 20 54 40.41 (0.09) 20 54 40.41 20 54 40.41 (0.1) 20 54 40.41 20 54 40.40 (0.09) 20 54 40.40
Declination 15 48 16.69 (0.09) 15 48 16.58 15 48 16.69 (0.1) 15 48 16.69 15 48 16.51 (0.09) 15 48 16.53
Spectral type DA DA DA DA DA DA
Effective temperature [K] 31711.0 (174) 27136.0 37796.0 (3988) 31638.0 (199)
log(g) [cgs] 7.86 (0.04) 7.63 8.09 (0.09) 7.86 (0.03)
Mass [M☉] 0.58 (0.02) 0.466 0.71 (0.07) 0.582 (0.01)
log(Luminosity) [L☉] -0.70 (0.03)
Cooling age [Gyr] 0.0074 (0.0002) 0.0128
log(H/He)
log(C/He)
log(Ca/He)
log(Ca/H)
log(C/H)
log(N/H)
log(O/H)
log(Na/H)
log(Mg/H)
log(Al/H)
log(Si/H)
log(P/H)
log(S/H)
log(Sc/H)
log(Ti/H)
log(Cr/H)
log(Mn/H)
log(Fe/H)
log(Ni/H)
Parallax [mas] 2.45 (0.1) 2.23 (0.2) 2.45 2.45 (0.1)
Distance [pc] 407.86 (19) 448.01 (33) 407.86 407.86 (19)
Composition H H
Proper motion (right ascension) [mas/yr] 15.76407124 (0.1) 15.97993551 (0.3) 15.764 (0.1)
Proper motion (declination) [mas/yr] 11.83105494 (0.1) 11.68309999 (0.3) 11.831 (0.1)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 17.34 (0.009) 17.34 (0.009) 17.35 (0.01)
g magnitude 17.61 (0.005) 17.61 (0.005) 17.64 (0.01)
r magnitude 18.08 (0.007) 18.08 (0.007) 18.14 (0.03)
i magnitude 18.38 (0.009) 18.38 (0.009) 18.46 (0.01)
z magnitude 18.66 (0.03) 18.66 (0.03) 18.69 (0.03)
G magnitude 17.85 (0.008) 17.89 17.85 17.85 (0.003)
BP magnitude 17.73 (0.008) 17.70
RP magnitude 18.09 (0.02) 18.13
Pan g magnitude 17.68 (0.007)
Pan r magnitude 18.09 (0.005)
Pan i magnitude 18.47 (0.01)
Pan z magnitude 18.74 (0.009)
Pan y magnitude 18.93 (0.04)
E(B-V) 0.049

* 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.