All names: SDSS J204219.36+040834.6, GALEX J204219.3+040834, SDSS J204219.36+040834.7, Gaia EDR3 1735092918444912000, Gaia DR2 1735092918443317888, Gaia DR3 1735092918444912000
| Parameter | Unit | Gaia EDR3 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 42 19.34 (0.4) | 20 42 19.38 (0.4) | ||
| Declination | 04 08 34.68 (0.2) | 04 08 34.71 (0.2) | ||
| Spectral type | DA | |||
| 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] | 3.89 (0.4) | 3.89 (0.4) | |
| Distance | [pc] | 256.94 (29) | 256.94 (29) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -40.655 (0.5) | -40.655 (0.5) | |
| Proper motion (declination) | [mas/yr] | -2.027 (0.4) | -2.027 (0.4) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | ||||
| V magnitude | ||||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | ||||
| H magnitude | ||||
| K magnitude | ||||
| u magnitude | 19.78 (0.04) | |||
| g magnitude | 19.62 (0.01) | |||
| r magnitude | 19.64 (0.01) | |||
| i magnitude | 19.82 (0.02) | |||
| z magnitude | 19.93 (0.08) | |||
| G magnitude | 19.59 (0.004) | 19.59 (0.004) | ||
| BP magnitude | 19.66 (0.04) | |||
| RP magnitude | 19.48 (0.06) | |||
| Pan g magnitude | ||||
| Pan r magnitude | ||||
| Pan i magnitude | ||||
| Pan z magnitude | ||||
| Pan y magnitude | ||||
| E(B-V) | 0.042 | |||
* 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.