SDSS J215514.43-075833.8

All names: SDSS J215514.43-075833.7, USNO-B1.0 0820-00780088, WD 2152-082, SDSS J215514.44-075833.80, SDSS J215514.43-075833.8, Gaia EDR3 2618775219754495616, Gaia DR2 2618775219754495616, SDSS J215514.44-075833.8, PB 7014, Gaia DR3 2618775219754495616

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Bedard et al. 2020 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Eisenstein et al. 2006 Vincent et al. 2024 Simbad White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 21 55 14.42 (0.2) 21 55 14.44 21 55 14.42 (0.3) 21 55 14.44 21 55 14.42 21 55 14.44 (0.2) 21 55 13.75 21 55 14.44
Declination -07 58 34.07 (0.2) -07 58 33.79 -07 58 34.06 (0.3) -07 58 33.79 -07 58 34.07 -07 58 33.76 (0.2) -07 58 27.48 -07 58 33.83
Spectral type DB DB DB DB DB DB DB DB+MS
Effective temperature [K] 35438.0 (1429) 35459.0 32339.0 27292.0 35117.0 (712) 28800.0 (400) 39488.0 (4296) 33245.0 (746)
log(g) [cgs] 8.11 (0.2) 8.14 8.12 7.98 7.90 (0.07) 7.79 (0.05) 8.49 (0.1) 8.23 (0.09)
Mass [M] 0.69 (0.09) 0.704 0.686 0.599 0.919 (0.09) 0.75 (0.05)
log(Luminosity) [L] -0.68 (0.1)
Cooling age [Gyr] 0.0058 (0.0007) 0.0146
log(H/He) -3.236 <-2.78
log(C/He)
log(Ca/He) <-4.0
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] 2.66 (0.2) 2.28 (0.3) 2.66 2.66 (0.2)
Distance [pc] 376.58 (30) 437.75 (62) 546.00 376.58 376.58 (30)
Composition He He
Proper motion (right ascension) [mas/yr] -15.39067269 (0.2) -15.23230012 (0.5) -15.391 (0.2)
Proper motion (declination) [mas/yr] -19.3897616 (0.2) -19.32892333 (0.5) -19.39 (0.2)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity WDMS
B magnitude 18.50
V magnitude
R magnitude
I magnitude
J magnitude
H magnitude
K magnitude
u magnitude 18.07 (0.01) 18.07 (0.02) 18.07 (0.01) 18.07 18.07 (0.02)
g magnitude 18.30 (0.007) 18.27 (0.03) 18.30 (0.007) 18.27 18.27 (0.03)
r magnitude 18.73 (0.01) 18.71 (0.02) 18.73 (0.01) 18.72 18.71 (0.02)
i magnitude 19.02 (0.01) 18.99 (0.03) 19.02 (0.01) 19.00 18.99 (0.03)
z magnitude 19.29 (0.07) 19.23 (0.07) 19.29 (0.07) 19.24 19.21 (0.08)
G magnitude 18.51 (0.02) 18.55 18.51 18.51 (0.003)
BP magnitude 18.38 (0.02) 18.36
RP magnitude 18.79 (0.05) 18.55
Pan g magnitude 18.34 (0.007)
Pan r magnitude 18.72 (0.009)
Pan i magnitude 19.06 (0.007)
Pan z magnitude 19.32 (0.02)
Pan y magnitude 19.39 (0.08)
E(B-V) 0.040

* 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.