All names: TYC 499-2297-1, 2MASS J20095165+0310317, Gaia DR2 4244048534563315200, GALEX J200951.5+031031, GALEXJ20098+0310, Gaia DR3 4244048534563315200, TIC 399171956, GALEX J200951.6+031032
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 09 51.56 | 20 09 51.67 (0.08) | ||
| Declination | 03 10 31.76 | 03 10 31.77 (0.07) | ||
| Spectral type | sdB | sdB | ||
| Effective temperature | [K] | 27160.0 (350) | ||
| log(g) | [cgs] | 5.46 (0.05) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 3.34 (0.7) | 2.26 (0.1) | |
| Distance | [pc] | 299.69 (65) | 442.13 (21) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 9.421 (1) | 14.361 (0.1) | |
| Proper motion (declination) | [mas/yr] | 1.852 (0.9) | -1.126 (0.1) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 12.66 (0.2) | |||
| V magnitude | 12.63 (0.2) | |||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 12.73 (0.03) | 12.73 (0.03) | ||
| H magnitude | 12.46 (0.03) | 12.46 (0.03) | ||
| K magnitude | 12.41 (0.03) | 12.41 (0.03) | ||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 12.64 (0.0008) | 12.66 (0.003) | ||
| BP magnitude | 12.48 (0.006) | |||
| RP magnitude | 12.73 (0.002) | |||
| Pan g magnitude | ||||
| Pan r magnitude | 18.39 (0.4) | |||
| Pan i magnitude | ||||
| Pan z magnitude | ||||
| Pan y magnitude | ||||
| E(B-V) | 0.068 | |||
* 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.