PG 1642+038

All names: PG1642+038, PG 1642+038, UCAC4 469-055944, Gaia DR2 4433996010145129344, Gaia DR3 4433996010145129344, TIC 270795409, UCAC2 33062367, GALEX J164445.6+034218, 2MASS J16444558+0342188

Parameter Unit Geier 2020 Stilism Simbad
Right ascension 16 44 45.59 16 44 45.58 (0.03)
Declination 03 42 19.52 03 42 19.16 (0.02)
Spectral type He-sdO sdOC
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] 0.42 (0.06) 0.45 (0.04)
Distance [pc] 2369.11 (348) 2230.15 (195)
Composition
Proper motion (right ascension) [mas/yr] -3.897 (0.1) -3.985 (0.05)
Proper motion (declination) [mas/yr] -4.543 (0.09) -4.522 (0.04)
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 15.25 (0.02)
V magnitude 15.37 (0.01)
R magnitude 15.66 (0.2)
I magnitude
J magnitude 15.83 (0.08) 15.83 (0.08)
H magnitude 16.18 (0.2) 16.18 (0.2)
K magnitude 15.45
u magnitude
g magnitude
r magnitude
i magnitude
z magnitude
G magnitude 15.34 (0.0008) 15.33 (0.003)
BP magnitude 15.13 (0.01)
RP magnitude 15.58 (0.003)
Pan g magnitude 15.18 (0.002)
Pan r magnitude 15.57 (0.003)
Pan i magnitude 15.93 (0.003)
Pan z magnitude 16.19 (0.004)
Pan y magnitude 16.38 (0.01)
E(B-V) 0.076

* 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.