All names: SDSS J183131.64+420220.30, SDSS J183131.64+420220.2, Gaia EDR3 2111270034246759424, SDSS J183131.64+420220.3, SDSS J183131.63+420220.2, Gaia DR3 2111270034246759424, Gaia DR2 2111270034246759424
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Genest-Beaulieu & Bergeron 2019 (spectroscopic) | Genest-Beaulieu & Bergeron 2019 (photometric) | Gaia DR2 | Stilism | Koester & Kepler 2015 | Simbad | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 18 31 31.64 (0.06) | 18 31 31.64 | 18 31 31.64 (0.07) | 18 31 31.64 (0.06) | 18 31 31.64 | ||||||
| Declination | 42 02 20.08 (0.07) | 42 02 20.27 | 42 02 20.09 (0.09) | 42 02 20.32 (0.07) | 42 02 20.28 | ||||||
| Spectral type | DB | DB_BINARY: | |||||||||
| Effective temperature | [K] | 12470.0 | 20146.0 | 13057.0 (43) | 48462.0 (47) | ||||||
| log(g) | [cgs] | 7.14 | 5.30 | 8.00 (0) | 7.42 (0.02) | ||||||
| Mass | [M☉] | 0.243 | 0.072 | ||||||||
| log(Luminosity) | [L☉] | ||||||||||
| Cooling age | [Gyr] | ||||||||||
| log(H/He) | <-6.555 | <-6.46 | |||||||||
| log(C/He) | |||||||||||
| log(Ca/He) | -9.39 (0.2) | ||||||||||
| log(Ca/H) | |||||||||||
| Parallax | [mas] | 0.71 (0.07) | 0.73 (0.09) | 0.71 (0.07) | |||||||
| Distance | [pc] | 1407.69 (138) | 1371.53 (172) | 121.00 | 1407.66 (138) | ||||||
| Composition | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -0.677638811 (0.08) | -0.868916304 (0.2) | -0.678 (0.08) | |||||||
| Proper motion (declination) | [mas/yr] | -15.07039653 (0.08) | -15.53323022 (0.2) | -15.07 (0.08) | |||||||
| Variability | |||||||||||
| Magnetic | |||||||||||
| Bd | [MG] | ||||||||||
| Infrared excess (disk) | |||||||||||
| Binarity | |||||||||||
| B magnitude | |||||||||||
| V magnitude | |||||||||||
| R magnitude | |||||||||||
| I magnitude | |||||||||||
| J magnitude | |||||||||||
| H magnitude | |||||||||||
| K magnitude | |||||||||||
| u magnitude | 16.86 (0.008) | 16.86 (0.008) | 16.87 (0.01) | ||||||||
| g magnitude | 16.89 (0.004) | 16.90 (0.004) | 16.91 (0.04) | ||||||||
| r magnitude | 17.21 (0.005) | 17.23 (0.005) | 17.21 (0.01) | ||||||||
| i magnitude | 17.48 (0.006) | 17.49 (0.006) | 17.48 (0.01) | ||||||||
| z magnitude | 17.73 (0.02) | 17.73 (0.02) | 17.72 (0.02) | ||||||||
| G magnitude | 17.55 (0.07) | 17.66 | 17.55 (0.03) | ||||||||
| BP magnitude | 17.35 (0.07) | 17.33 | |||||||||
| RP magnitude | 17.54 (0.07) | 17.57 | |||||||||
| Pan g magnitude | 16.97 (0.003) | ||||||||||
| Pan r magnitude | 17.26 (0.004) | ||||||||||
| Pan i magnitude | 17.51 (0.004) | ||||||||||
| Pan z magnitude | 17.72 (0.01) | ||||||||||
| Pan y magnitude | 17.88 (0.03) | ||||||||||
| E(B-V) | 0.037 | ||||||||||
* 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.