All names: 2MASS J20394907-1557327, Gaia DR2 6863088397315654656, UCAC4 371-179594, GALEX J203949.0-155732, EC 20370-1608, Gaia DR3 6863088397315654656, EC20370-1608, Gaia EDR3 6863088397315654656
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 20 39 49.08 (0.04) | 20 39 49.09 | 20 39 49.07 (0.04) | ||
| Declination | -15 57 32.96 (0.03) | -15 57 33.01 | -15 57 32.79 (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] | 0.79 (0.04) | 0.86 (0.06) | 0.79 (0.04) | |
| Distance | [pc] | 1259.92 (66) | 1164.14 (85) | 1259.92 (66) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | 7.014 (0.04) | 6.944 (0.1) | 7.014 (0.04) | |
| Proper motion (declination) | [mas/yr] | -10.594 (0.03) | -10.681 (0.07) | -10.594 (0.03) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 14.98 (0.01) | ||||
| V magnitude | 15.10 (0.01) | ||||
| R magnitude | 15.60 (0.2) | ||||
| I magnitude | |||||
| J magnitude | 15.74 (0.06) | 15.74 (0.06) | |||
| H magnitude | 15.51 (0.1) | 15.51 (0.1) | |||
| K magnitude | 15.54 (0.2) | 15.54 (0.2) | |||
| u magnitude | 14.74 (0.004) | ||||
| g magnitude | 14.88 (0.003) | 14.94 (0.01) | |||
| r magnitude | 15.30 (0.004) | 15.28 (0.01) | |||
| i magnitude | 15.62 (0.004) | 15.80 (0.01) | |||
| z magnitude | 15.90 (0.007) | ||||
| G magnitude | 15.07 (0.003) | 15.09 (0.0005) | 15.07 (0.003) | ||
| BP magnitude | 14.96 (0.003) | 14.89 (0.009) | |||
| RP magnitude | 15.30 (0.004) | 15.30 (0.003) | |||
| Pan g magnitude | 14.94 (0.001) | ||||
| Pan r magnitude | 15.31 (0.004) | ||||
| Pan i magnitude | 15.65 (0.002) | ||||
| Pan z magnitude | 15.91 (0.002) | ||||
| Pan y magnitude | 16.07 (0.007) | ||||
| E(B-V) | 0.049 | ||||
* 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.