All names: TYC 510-316-1, 2MASS J20311828+0105257, Gaia EDR3 4230753789714485376, Gaia DR3 4230753789714485376, GALEX J203118.5+010527, ALS 11394, uvby98 804000021, Gaia DR2 4230753789714485376, LS IV +00 21, CSI+00-20288, Balloon 90600002, TIC 375769526, Bal90600002
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 20 31 18.31 (0.04) | 20 31 18.28 | 20 31 18.28 (0.04) | ||
| Declination | 01 05 25.62 (0.03) | 01 05 25.81 | 01 05 25.86 (0.03) | ||
| Spectral type | sdB | sdB | |||
| Effective temperature | [K] | 35000.0 (5000) | |||
| log(g) | [cgs] | 5.42 (0.5) | |||
| Mass | [M☉] | ||||
| log(Luminosity) | [L☉] | ||||
| Cooling age | [Gyr] | ||||
| log(H/He) | |||||
| log(C/He) | |||||
| log(Ca/He) | |||||
| log(Ca/H) | |||||
| Parallax | [mas] | 2.74 (0.05) | 2.84 (0.07) | 2.74 (0.05) | |
| Distance | [pc] | 364.33 (7) | 352.50 (8) | 364.33 (7) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | 24.097 (0.07) | 24.229 (0.2) | 24.097 (0.07) | |
| Proper motion (declination) | [mas/yr] | -14.767 (0.05) | -15.096 (0.1) | -14.767 (0.04) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 12.45 (0.2) | ||||
| V magnitude | 12.82 (0.3) | ||||
| R magnitude | |||||
| I magnitude | |||||
| J magnitude | 12.95 (0.03) | 12.95 (0.03) | |||
| H magnitude | 13.06 (0.03) | 13.06 (0.03) | |||
| K magnitude | 13.17 (0.05) | 13.17 (0.05) | |||
| u magnitude | 12.63 (0.005) | ||||
| g magnitude | |||||
| r magnitude | 12.83 (0.002) | ||||
| i magnitude | 13.16 (0.002) | ||||
| z magnitude | 13.44 (0.004) | ||||
| G magnitude | 12.39 (0.003) | 12.41 (0.0005) | 12.39 (0.003) | ||
| BP magnitude | 12.24 (0.003) | 12.19 (0.008) | |||
| RP magnitude | 12.69 (0.004) | 12.69 (0.001) | |||
| Pan g magnitude | 12.63 | ||||
| Pan r magnitude | 12.94 | ||||
| Pan i magnitude | 13.17 | ||||
| Pan z magnitude | 13.32 (0.006) | ||||
| Pan y magnitude | 13.50 (0.01) | ||||
| E(B-V) | 0.046 | ||||
* 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.