All names: TIC 331754996, JL 79, EC21246-7737, Gaia DR3 6356554041918405760, GALEX J213019.3-772357, Gaia DR2 6356554041918405760, EC 21246-7737, 2MASS J21301977-7723561
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 21 30 19.85 | 21 30 19.71 (0.03) | ||
| Declination | -77 23 56.33 | -77 23 56.39 (0.03) | ||
| 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] | 0.34 (0.05) | 0.31 (0.04) | |
| Distance | [pc] | 2907.82 (438) | 3214.40 (382) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 2.091 (0.08) | 1.945 (0.04) | |
| Proper motion (declination) | [mas/yr] | -3.955 (0.09) | -3.81 (0.05) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 15.83 | |||
| V magnitude | 16.13 | |||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 16.35 (0.1) | 16.35 (0.1) | ||
| H magnitude | 15.89 | |||
| K magnitude | 16.03 | |||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 16.10 (0.001) | 16.08 (0.003) | ||
| BP magnitude | 15.93 (0.007) | |||
| RP magnitude | 16.28 (0.003) | |||
| Pan g magnitude | ||||
| Pan r magnitude | ||||
| Pan i magnitude | ||||
| Pan z magnitude | ||||
| Pan y magnitude | ||||
| E(B-V) | 0.062 | |||
* 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.