Ton 640

All names: PG1242+241, Gaia DR3 3956305349435241856, Ton 640, TIC 347346961, Gaia DR2 3956305349435241856, 2MASS J12450596+2352242, PG 1242+241, GALEX J124506.0+235224

Parameter Unit Geier 2020 Stilism Simbad
Right ascension 12 45 05.96 12 45 05.95 (0.04)
Declination 23 52 24.40 23 52 23.95 (0.03)
Spectral type sdB sdB
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] 0.16 (0.07) 0.09 (0.05)
Distance [pc] 6426.74 (2982) 11682.24 (6483)
Composition
Proper motion (right ascension) [mas/yr] -1.413 (0.1) -1.392 (0.05)
Proper motion (declination) [mas/yr] -6.162 (0.07) -6.016 (0.04)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 14.50
V magnitude
R magnitude
I magnitude
J magnitude 15.92 (0.08) 15.92 (0.08)
H magnitude 16.29 (0.2) 16.29 (0.2)
K magnitude 15.04
u magnitude 14.68 (0.004)
g magnitude 15.02 (0.004)
r magnitude 15.56 (0.004)
i magnitude 15.90 (0.005)
z magnitude 16.21 (0.007)
G magnitude 15.30 (0.0007) 15.29 (0.003)
BP magnitude 15.06 (0.006)
RP magnitude 15.58 (0.003)
Pan g magnitude 15.11 (0.002)
Pan r magnitude 15.55 (0.003)
Pan i magnitude 15.91 (0.004)
Pan z magnitude 16.20 (0.004)
Pan y magnitude 16.37 (0.003)
E(B-V) 0.018

* 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.