All names: SDSS J165640.80+211812.8, SDSS J165640.81+211812.8, GALEX J165640.9+211813, SDSS J165640.81+211812.85, Gaia EDR3 4565039409418801152, Gaia DR2 4565039409418801152, SDSS J165640.81+211812.9, Gaia DR3 4565039409418801152, SDSS J165640.80+211812.9
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR10 | Bedard et al. 2020 | Gaia DR2 | Stilism | Kepler et al. 2015 | Simbad | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 56 40.81 (0.09) | 16 56 40.81 | 16 56 40.81 (0.1) | 16 56 40.81 (0.09) | ||||||
| Declination | 21 18 12.78 (0.09) | 21 18 12.90 | 21 18 12.79 (0.1) | 21 18 12.90 (0.09) | ||||||
| Spectral type | DA+M | DA | DA+dM | DA+MS | ||||||
| Effective temperature | [K] | 46740.0 (1152) | 60167.0 (1605) | |||||||
| log(g) | [cgs] | 7.48 (0.1) | 7.58 (0.08) | |||||||
| Mass | [M☉] | 0.47 (0.03) | 0.55 (0.02) | |||||||
| log(Luminosity) | [L☉] | 0.27 (0.08) | ||||||||
| Cooling age | [Gyr] | 0.0006 (0.0004) | ||||||||
| log(H/He) | ||||||||||
| log(C/He) | ||||||||||
| log(Ca/He) | ||||||||||
| log(Ca/H) | ||||||||||
| log(C/H) | ||||||||||
| log(N/H) | ||||||||||
| log(O/H) | ||||||||||
| log(Na/H) | ||||||||||
| log(Mg/H) | ||||||||||
| log(Al/H) | ||||||||||
| log(Si/H) | ||||||||||
| log(P/H) | ||||||||||
| log(S/H) | ||||||||||
| log(Sc/H) | ||||||||||
| log(Ti/H) | ||||||||||
| log(Cr/H) | ||||||||||
| log(Mn/H) | ||||||||||
| log(Fe/H) | ||||||||||
| log(Ni/H) | ||||||||||
| Parallax | [mas] | 1.11 (0.1) | 1.09 (0.2) | 1.11 (0.1) | ||||||
| Distance | [pc] | 897.87 (114) | 915.07 (155) | 897.83 (114) | ||||||
| Composition | H | |||||||||
| Proper motion (right ascension) | [mas/yr] | -4.414281678 (0.1) | -4.451781609 (0.2) | -4.414 (0.1) | ||||||
| Proper motion (declination) | [mas/yr] | -6.989079773 (0.1) | -6.778794676 (0.3) | -6.989 (0.1) | ||||||
| Variability | ||||||||||
| Magnetic | ||||||||||
| Bd | [MG] | |||||||||
| Infrared excess (disk) | ||||||||||
| Binarity | WDMS | |||||||||
| B magnitude | ||||||||||
| V magnitude | ||||||||||
| R magnitude | ||||||||||
| I magnitude | ||||||||||
| J magnitude | ||||||||||
| H magnitude | ||||||||||
| K magnitude | ||||||||||
| u magnitude | 18.20 (0.01) | 18.19 (0.02) | 18.20 (0.01) | |||||||
| g magnitude | 18.46 (0.007) | 18.47 (0.01) | 18.46 (0.007) | |||||||
| r magnitude | 18.88 (0.01) | 18.87 (0.01) | 18.88 (0.01) | |||||||
| i magnitude | 18.83 (0.01) | 18.84 (0.02) | 18.83 (0.01) | |||||||
| z magnitude | 18.61 (0.03) | 18.61 (0.03) | 18.61 (0.03) | |||||||
| G magnitude | 18.57 (0.01) | 18.60 | 18.57 (0.003) | |||||||
| BP magnitude | 18.56 (0.01) | 18.51 | ||||||||
| RP magnitude | 18.50 (0.03) | 18.46 | ||||||||
| Pan g magnitude | 18.53 (0.007) | |||||||||
| Pan r magnitude | 18.87 (0.008) | |||||||||
| Pan i magnitude | 18.85 (0.005) | |||||||||
| Pan z magnitude | 18.70 (0.01) | |||||||||
| Pan y magnitude | 18.56 (0.02) | |||||||||
| E(B-V) | 0.042 | |||||||||
* 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.