UM 226

All names: GALEX J001740.5-015019, DENIS J001740.5-015018, PB5844, Gaia DR2 2541632865473915520, UM 226, USNO-B1.0 0881-00004641, PB 5844, LBQS 0015-0206, Gaia EDR3 2541632865473915520, Gaia DR3 2541632865473915520, LEDA 1157

Parameter Unit Gaia EDR3 Geier 2020 Stilism Simbad
Right ascension 00 17 40.55 (0.2) 00 17 40.52 00 17 40.55 (0.2)
Declination -01 50 20.20 (0.1) -01 50 18.93 -01 50 20.07 (0.1)
Spectral type sdOB sdOB
Effective temperature [K]
log(g) [cgs]
Mass [M☉]
log(Luminosity) [L☉]
Cooling age [Gyr]
log(H/He)
log(C/He)
log(Ca/He)
log(Ca/H)
Parallax [mas] 1.59 (0.2) 1.53 (0.3) 1.59 (0.2)
Distance [pc] 629.29 (74) 652.91 (133) 629.29 (74)
Composition
Proper motion (right ascension) [mas/yr] 2.363 (0.2) 1.708 (0.6) 2.363 (0.2)
Proper motion (declination) [mas/yr] -8.029 (0.2) -7.794 (0.3) -8.029 (0.2)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 18.00
V magnitude
R magnitude 18.90
I magnitude 18.24 (0.2)
J magnitude
H magnitude
K magnitude
u magnitude 18.20 (0.01) 18.20 (0.01)
g magnitude 18.20 (0.007) 18.20 (0.007)
r magnitude 18.60 (0.009) 18.60 (0.009)
i magnitude 18.88 (0.01) 18.88 (0.01)
z magnitude 19.18 (0.04) 19.18 (0.04)
G magnitude 18.40 (0.003) 18.42 (0.003) 18.40 (0.003)
BP magnitude 18.32 (0.01) 18.25 (0.01)
RP magnitude 18.61 (0.03) 18.57 (0.02)
Pan g magnitude 18.23 (0.009)
Pan r magnitude 18.58 (0.007)
Pan i magnitude 18.91 (0.006)
Pan z magnitude 19.17 (0.02)
Pan y magnitude 19.32 (0.04)
E(B-V) 0.025

* 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.