All names: SDSS J204720.77+163134.9, SDSS J204720.77+163135.0, GALEX J204720.7+163135, Gaia EDR3 1763121973800664448, Gaia DR3 1763121973800664448, Gaia DR2 1763121973800664448
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Gaia DR2 | Stilism | Simbad | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|
| Right ascension | 20 47 20.77 (0.4) | 20 47 20.77 (0.6) | 20 47 20.77 (0.4) | 20 47 20.77 | ||||
| Declination | 16 31 34.87 (0.3) | 16 31 34.87 (0.8) | 16 31 34.95 (0.3) | 16 31 34.99 | ||||
| Spectral type | DA | DA | DA | |||||
| Effective temperature | [K] | 16661.0 (551) | ||||||
| log(g) | [cgs] | 7.39 (0.1) | ||||||
| Mass | [M☉] | 0.391 (0.03) | ||||||
| log(Luminosity) | [L☉] | |||||||
| Cooling age | [Gyr] | |||||||
| log(H/He) | ||||||||
| log(C/He) | ||||||||
| log(Ca/He) | ||||||||
| log(Ca/H) | ||||||||
| Parallax | [mas] | 0.96 (0.5) | 0.61 (0.8) | 0.96 (0.5) | ||||
| Distance | [pc] | 1038.86 (547) | 1636.93 (2051) | 1038.85 (547) | ||||
| Composition | ||||||||
| Proper motion (right ascension) | [mas/yr] | -6.358348993 (0.4) | -8.242 (1) | -6.358 (0.4) | ||||
| Proper motion (declination) | [mas/yr] | -4.942908341 (0.5) | -6.075 (1) | -4.943 (0.5) | ||||
| Variability | ||||||||
| Magnetic | ||||||||
| Bd | [MG] | |||||||
| Infrared excess (disk) | ||||||||
| Binarity | ||||||||
| B magnitude | ||||||||
| V magnitude | ||||||||
| R magnitude | ||||||||
| I magnitude | ||||||||
| J magnitude | ||||||||
| H magnitude | ||||||||
| K magnitude | ||||||||
| u magnitude | 20.43 (0.06) | 20.43 (0.06) | ||||||
| g magnitude | 20.04 (0.03) | 20.04 (0.03) | ||||||
| r magnitude | 20.29 (0.02) | 20.29 (0.02) | ||||||
| i magnitude | 20.52 (0.04) | 20.52 (0.04) | ||||||
| z magnitude | 20.92 (0.2) | 20.92 (0.2) | ||||||
| G magnitude | 20.16 (0.05) | 20.23 | 20.16 (0.005) | |||||
| BP magnitude | 20.16 (0.05) | 20.13 | ||||||
| RP magnitude | 20.13 (0.09) | 20.14 | ||||||
| Pan g magnitude | 20.11 (0.01) | |||||||
| Pan r magnitude | 20.30 (0.02) | |||||||
| Pan i magnitude | 20.61 (0.06) | |||||||
| Pan z magnitude | 20.72 (0.06) | |||||||
| Pan y magnitude | ||||||||
| E(B-V) | 0.065 | |||||||
* 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.