All names: GALEX J164216.6+225627, SDSS J164216.62+225627.9, SDSS J164216.63+225627.9, Gaia DR2 1299405148105489664, Gaia DR3 1299405148105489664, SDSS J164216.62+225627.8, WD 1640+230, Gaia EDR3 1299405148105489664, WIRED J164216.62+225627.8, SDSS J164216.63+225627.8
| Parameter | Unit | Gaia EDR3 | Stilism | Vincent et al. 2024 | Simbad | Vincent et al. 2023 |
|---|---|---|---|---|---|---|
| Right ascension | 16 42 16.63 (0.03) | 16 42 16.63 | 16 42 16.62 (0.03) | |||
| Declination | 22 56 27.77 (0.04) | 22 56 27.77 | 22 56 27.89 (0.04) | |||
| Spectral type | DA | DA | DA | |||
| Effective temperature | [K] | 12177.0 (175) | ||||
| log(g) | [cgs] | 8.12 (0.01) | ||||
| Mass | [M☉] | 0.676 (0.01) | ||||
| log(Luminosity) | [L☉] | |||||
| Cooling age | [Gyr] | |||||
| log(H/He) | ||||||
| log(C/He) | ||||||
| log(Ca/He) | ||||||
| log(Ca/H) | ||||||
| Parallax | [mas] | 8.57 (0.06) | 8.57 | 8.57 (0.06) | ||
| Distance | [pc] | 116.74 (0.8) | 116.74 | 116.74 (0.8) | ||
| Composition | ||||||
| Proper motion (right ascension) | [mas/yr] | 9.085 (0.05) | 9.085 (0.05) | |||
| Proper motion (declination) | [mas/yr] | -7.645 (0.05) | -7.645 (0.05) | |||
| Variability | ||||||
| Magnetic | ||||||
| Bd | [MG] | |||||
| Infrared excess (disk) | ||||||
| Binarity | ||||||
| B magnitude | ||||||
| V magnitude | ||||||
| R magnitude | ||||||
| I magnitude | ||||||
| J magnitude | ||||||
| H magnitude | ||||||
| K magnitude | ||||||
| u magnitude | 17.47 (0.009) | |||||
| g magnitude | 17.07 (0.005) | |||||
| r magnitude | 17.30 (0.005) | |||||
| i magnitude | 17.47 (0.006) | |||||
| z magnitude | 17.63 (0.01) | |||||
| G magnitude | 17.18 (0.003) | 17.18 | 17.18 (0.003) | |||
| BP magnitude | 17.20 (0.005) | |||||
| RP magnitude | 17.18 (0.01) | |||||
| Pan g magnitude | ||||||
| Pan r magnitude | ||||||
| Pan i magnitude | ||||||
| Pan z magnitude | ||||||
| Pan y magnitude | ||||||
| E(B-V) | 0.017 | |||||
* 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.