All names: GALEXJ20478-1450, 2MASS J20474841-1450266, UCAC4 376-173361, GALEX J204748.4-145028, Gaia DR2 6886550768565402368, EC 20450-1501, WISE J204748.41-145026.7, Gaia DR3 6886550768565402368
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 47 48.43 | 20 47 48.43 (0.04) | ||
| Declination | -14 50 28.23 | -14 50 26.67 (0.02) | ||
| Spectral type | He-sdB | sdOC8VIIHe38 | ||
| 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] | 0.78 (0.05) | 0.78 (0.04) | |
| Distance | [pc] | 1286.34 (83) | 1288.00 (70) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 4.987 (0.1) | 4.897 (0.05) | |
| Proper motion (declination) | [mas/yr] | -6.628 (0.08) | -6.765 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 13.74 | |||
| V magnitude | 14.00 | |||
| R magnitude | 14.27 (0.08) | |||
| I magnitude | ||||
| J magnitude | 14.59 (0.03) | 14.59 (0.03) | ||
| H magnitude | 14.69 (0.08) | 14.69 (0.08) | ||
| K magnitude | 14.61 (0.1) | 14.61 (0.1) | ||
| u magnitude | 13.32 (0.003) | |||
| g magnitude | ||||
| r magnitude | 14.17 (0.003) | |||
| i magnitude | 14.50 (0.004) | |||
| z magnitude | 14.78 (0.005) | |||
| G magnitude | 13.93 (0.0006) | 13.92 (0.003) | ||
| BP magnitude | 13.69 (0.006) | |||
| RP magnitude | 14.20 (0.001) | |||
| Pan g magnitude | 13.78 (0.0008) | |||
| Pan r magnitude | 14.19 (0.004) | |||
| Pan i magnitude | 14.55 (0.002) | |||
| Pan z magnitude | 14.80 (0.003) | |||
| Pan y magnitude | 14.99 (0.005) | |||
| E(B-V) | 0.041 | |||
* 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.