All names: UCAC2 31244053, 2MASS J20215563-0152398, UCAC4 441-117201, WISEA J202155.65-015239.9, GALEXJ20219-0152, WISE J202155.64-015239.8, GALEX J202155.7-015238, TIC 212474680, Gaia DR2 4223152835768422528, Gaia DR3 4223152835768422528
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 21 55.79 | 20 21 55.63 (0.04) | ||
| Declination | -01 52 38.92 | -01 52 40.00 (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] | 1.09 (0.08) | 0.91 (0.05) | |
| Distance | [pc] | 921.57 (69) | 1104.61 (59) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 0.962 (0.1) | 1.099 (0.04) | |
| Proper motion (declination) | [mas/yr] | 3.949 (0.08) | 4.043 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 14.16 (0.05) | |||
| V magnitude | 14.43 (0.01) | |||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 14.59 (0.03) | 14.59 (0.03) | ||
| H magnitude | 14.44 (0.06) | 14.44 (0.06) | ||
| K magnitude | 14.38 (0.08) | 14.38 (0.08) | ||
| u magnitude | ||||
| g magnitude | 14.17 (0.01) | |||
| r magnitude | 14.60 (0.01) | |||
| i magnitude | 14.94 (0.01) | |||
| z magnitude | ||||
| G magnitude | 14.34 (0.001) | 14.34 (0.003) | ||
| BP magnitude | 14.18 (0.009) | |||
| RP magnitude | 14.48 (0.003) | |||
| Pan g magnitude | 14.19 (0.002) | |||
| Pan r magnitude | 14.54 (0.003) | |||
| Pan i magnitude | 14.84 (0.003) | |||
| Pan z magnitude | 15.06 (0.004) | |||
| Pan y magnitude | 15.19 (0.008) | |||
| E(B-V) | 0.093 | |||
* 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.