All names: Gaia DR3 2117331573132975360, KeplerJ18427+4404, GALEX J184242.4+440405, EQ J1842.7+4404, TIC 123198279, KIC 8142623, Gaia DR2 2117331573132975360, 2MASS J18424248+4404055
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 18 42 42.40 | 18 42 42.49 (0.05) | ||
| Declination | 44 04 05.00 | 44 04 05.58 (0.05) | ||
| 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) | 0.23 (0.06) | |
| Distance | [pc] | 6153.85 (2821) | 4290.00 (1025) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -3.12 (0.2) | -3.506 (0.07) | |
| Proper motion (declination) | [mas/yr] | -0.254 (0.2) | -0.314 (0.07) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | ||||
| V magnitude | ||||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 16.75 (0.1) | 16.75 (0.1) | ||
| H magnitude | 16.34 (0.2) | 16.34 (0.2) | ||
| K magnitude | 15.78 (0.2) | 15.78 (0.2) | ||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 17.15 (0.002) | 17.12 (0.003) | ||
| BP magnitude | 17.04 (0.01) | |||
| RP magnitude | 17.13 (0.01) | |||
| Pan g magnitude | 17.09 (0.008) | |||
| Pan r magnitude | 17.32 (0.003) | |||
| Pan i magnitude | 17.46 (0.002) | |||
| Pan z magnitude | 17.55 (0.008) | |||
| Pan y magnitude | 17.58 (0.01) | |||
| E(B-V) | 0.035 | |||
* Constant surface field
Spectra without link are available upon request
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.