All names: LAMOST J002124.79+402857.1, WISE J002124.74+402856.8, Gaia DR3 380338531092183424, 2MASS J00212479+4028570, TIC 288292938, UCAC4 653-001357, WISEA J002124.74+402856.8, LAMOSTJ002124.79+402857.1, GALEX J002124.7+402857, Gaia DR2 380338531092183424
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 00 21 24.79 | 00 21 24.79 (0.03) | ||
| Declination | 40 28 57.13 | 40 28 57.10 (0.02) | ||
| Spectral type | sdB | sdBHe4 | ||
| Effective temperature | [K] | 27618.0 (178) | ||
| log(g) | [cgs] | 5.46 (0.03) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.44 (0.05) | 0.48 (0.04) | |
| Distance | [pc] | 2292.00 (281) | 2104.38 (178) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -2.94 (0.07) | -3.07 (0.03) | |
| Proper motion (declination) | [mas/yr] | 0.717 (0.03) | 0.638 (0.02) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | ||||
| V magnitude | ||||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 15.99 (0.08) | 15.99 (0.08) | ||
| H magnitude | 16.10 (0.2) | 16.10 (0.2) | ||
| K magnitude | 16.36 (0.4) | 16.36 (0.4) | ||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 15.51 (0.0004) | 15.50 (0.003) | ||
| BP magnitude | 15.35 (0.004) | |||
| RP magnitude | 15.70 (0.002) | |||
| Pan g magnitude | 15.37 (0.006) | |||
| Pan r magnitude | 15.71 (0.002) | |||
| Pan i magnitude | 16.03 (0.002) | |||
| Pan z magnitude | 16.29 (0.003) | |||
| Pan y magnitude | 16.42 (0.007) | |||
| 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.