All names: Gaia DR2 6908129371455280640, SDSS J204028.93-060852.5, GALEX J204028.9-060852, SDSSJ204028.93-060852.5, Gaia DR3 6908129371455280640
| Parameter | Unit | Geier 2020 | Simbad |
|---|---|---|---|
| Right ascension | 20 40 28.93 | 20 40 28.93 (0.1) | |
| Declination | -06 08 52.58 | -06 08 52.60 (0.07) | |
| Spectral type | sdB+MS | 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] | -0.12 (0.2) | |
| Distance | [pc] | ||
| Composition | |||
| Proper motion (right ascension) | [mas/yr] | 1.087 (0.3) | 1.04 (0.2) |
| Proper motion (declination) | [mas/yr] | -1.437 (0.2) | -1.714 (0.1) |
| Variability | |||
| Magnetic | |||
| Bd | [MG] | ||
| Infrared excess (disk) | |||
| Binarity | |||
| B magnitude | |||
| V magnitude | |||
| R magnitude | |||
| I magnitude | |||
| J magnitude | |||
| H magnitude | |||
| K magnitude | |||
| u magnitude | 18.43 (0.02) | 18.43 (0.02) | |
| g magnitude | 17.93 (0.006) | 17.93 (0.006) | |
| r magnitude | 18.20 (0.008) | 18.21 (0.008) | |
| i magnitude | 18.46 (0.01) | 18.46 (0.01) | |
| z magnitude | 18.65 (0.04) | 18.65 (0.04) | |
| G magnitude | 18.13 (0.002) | 18.10 (0.003) | |
| BP magnitude | 18.05 (0.009) | ||
| RP magnitude | 18.17 (0.03) | ||
| Pan g magnitude | 17.99 (0.004) | ||
| Pan r magnitude | 18.26 (0.004) | ||
| Pan i magnitude | 18.50 (0.005) | ||
| Pan z magnitude | 18.67 (0.009) | ||
| Pan y magnitude | 18.82 (0.02) | ||
| E(B-V) | |||
* 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.