FBS 2304+440

All names: ATO J346.6269+44.3135, 2MASS J23063044+4418488, ZTF J230630.48+441848.7, Gaia DR3 1934910499455947904, FBS B 417, FBS2304+440, TIC 173295499, FBS 2304+440, Gaia DR2 1934910499455947904, GALEX J230630.4+441848

Parameter Unit Geier 2020 Stilism Simbad
Right ascension 23 06 30.39 23 06 30.45 (0.01)
Declination 44 18 49.30 44 18 48.76 (0.02)
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] 1.50 (0.04) 1.61 (0.03)
Distance [pc] 666.62 (17) 622.63 (10)
Composition
Proper motion (right ascension) [mas/yr] 16.652 (0.05) 16.676 (0.02)
Proper motion (declination) [mas/yr] -5.949 (0.05) -6.095 (0.02)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 14.57
V magnitude 14.50
R magnitude
I magnitude
J magnitude 14.47 (0.03) 14.47 (0.03)
H magnitude 14.61 (0.07) 14.61 (0.07)
K magnitude 14.37 (0.09) 14.37 (0.09)
u magnitude
g magnitude 14.20
r magnitude 14.50
i magnitude
z magnitude
G magnitude 14.30 (0.004) 14.29 (0.004)
BP magnitude 14.21 (0.01)
RP magnitude 14.37 (0.02)
Pan g magnitude 14.12 (0.01)
Pan r magnitude 14.55 (0.009)
Pan i magnitude 14.64 (0.04)
Pan z magnitude 14.81 (0.03)
Pan y magnitude 15.00 (0.03)
E(B-V) 0.177

* 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.