All names: GALEX J205709.2-523954, EC 20535-5251, EC20535-5251, 2MASS J20570936-5239545, TIC 166657780, Gaia DR3 6476519109924854528, Gaia DR2 6476519109924854528, UCAC4 187-203822
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 57 09.30 | 20 57 09.36 (0.04) | ||
| Declination | -52 39 54.68 | -52 39 54.62 (0.03) | ||
| Spectral type | He-sdO | sdOHe | ||
| 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] | 0.39 (0.08) | 0.45 (0.05) | |
| Distance | [pc] | 2535.50 (521) | 2211.90 (257) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 0.09 (0.1) | 0.129 (0.05) | |
| Proper motion (declination) | [mas/yr] | -10.546 (0.1) | -10.577 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 15.89 (0.05) | |||
| V magnitude | 16.11 (0.01) | |||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 16.47 (0.1) | 16.47 (0.1) | ||
| H magnitude | 15.94 | |||
| K magnitude | 16.21 | |||
| u magnitude | ||||
| g magnitude | 15.93 (0.02) | |||
| r magnitude | 16.31 (0.03) | |||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 16.10 (0.001) | 16.07 (0.003) | ||
| BP magnitude | 15.86 (0.006) | |||
| RP magnitude | 16.36 (0.006) | |||
| Pan g magnitude | ||||
| Pan r magnitude | ||||
| Pan i magnitude | ||||
| Pan z magnitude | ||||
| Pan y magnitude | ||||
| E(B-V) | 0.021 | |||
* 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.