All names: 2MASS J21303861+2140283, Gaia DR1 1790904571050740736, Gaia DR2 1790904571050740736, TIC 283433547, GALEX J213038.6+214028, GALEXJ21306+2140, TYC 1676-852-1, Gaia DR3 1790904571050740736
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 21 30 38.63 | 21 30 38.62 (0.02) | ||
| Declination | 21 40 28.03 | 21 40 28.38 (0.02) | ||
| Spectral type | sdB+G | sdB+G | ||
| 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] | 1.60 (0.04) | 1.54 (0.02) | |
| Distance | [pc] | 624.30 (16) | 651.04 (11) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 24.762 (0.06) | 24.93 (0.02) | |
| Proper motion (declination) | [mas/yr] | -8.253 (0.06) | -8.238 (0.02) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 12.00 (0.1) | |||
| V magnitude | 11.64 (0.1) | |||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 11.70 (0.02) | 11.70 (0.02) | ||
| H magnitude | 11.54 (0.03) | 11.54 (0.03) | ||
| K magnitude | 11.53 (0.02) | 11.53 (0.02) | ||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 12.20 (0.0003) | 12.18 (0.003) | ||
| BP magnitude | 12.27 (0.003) | |||
| RP magnitude | 11.99 (0.001) | |||
| Pan g magnitude | 12.24 | |||
| Pan r magnitude | 12.20 | |||
| Pan i magnitude | 12.27 | |||
| Pan z magnitude | 12.36 | |||
| Pan y magnitude | 12.45 (0.003) | |||
| E(B-V) | 0.056 | |||
* 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.