All names: Gaia DR2 6677093567253709440, EC20440-4246, Gaia DR3 6677093567253709440, GALEX J204725.3-423536, 2MASS J20472538-4235366, EC 20440-4246
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 47 25.39 | 20 47 25.36 (0.05) | ||
| Declination | -42 35 37.54 | -42 35 36.57 (0.04) | ||
| Spectral type | sdB | sdBe? | ||
| 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] | 0.44 (0.07) | 0.27 (0.06) | |
| Distance | [pc] | 2265.52 (371) | 3711.95 (827) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -0.538 (0.1) | -0.324 (0.06) | |
| Proper motion (declination) | [mas/yr] | -4.466 (0.09) | -4.553 (0.05) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 16.23 | |||
| V magnitude | 16.46 | |||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 16.43 (0.1) | 16.43 (0.1) | ||
| H magnitude | 16.34 (0.3) | 16.34 (0.3) | ||
| K magnitude | 15.69 (0.2) | 15.69 (0.2) | ||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 16.35 (0.001) | 16.33 (0.003) | ||
| BP magnitude | 16.16 (0.008) | |||
| RP magnitude | 16.48 (0.005) | |||
| Pan g magnitude | ||||
| Pan r magnitude | ||||
| Pan i magnitude | ||||
| Pan z magnitude | ||||
| Pan y magnitude | ||||
| E(B-V) | 0.024 | |||
* 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.