All names: Gaia EDR3 659680558323666688, SDSS J083855.75+184946.5, SDSS J083855.76+184946.5, SDSS J083855.76+184946.50, GALEX J083855.8+184946, Gaia DR2 659680558323666688, Gaia DR3 659680558323666688
| 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 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 38 55.77 (0.2) | 08 38 55.76 | 08 38 55.77 (0.3) | 08 38 55.76 (0.2) | 08 38 55.76 | |||||||
| Declination | 18 49 46.32 (0.2) | 18 49 46.52 | 18 49 46.33 (0.2) | 18 49 46.60 (0.2) | 18 49 46.54 | |||||||
| Spectral type | DB | DBAH: | DB+MS | |||||||||
| Effective temperature | [K] | 17953.0 | 17210.0 | 18583.0 (228) | 18254.0 (284) | |||||||
| log(g) | [cgs] | 8.11 | 8.11 | 8.11 (0.09) | 8.07 (0.09) | |||||||
| Mass | [M☉] | 0.661 | 0.656 | |||||||||
| log(Luminosity) | [L☉] | |||||||||||
| Cooling age | [Gyr] | |||||||||||
| log(H/He) | -4.719 | <-4.29 | ||||||||||
| log(C/He) | ||||||||||||
| log(Ca/He) | <-5.0 | |||||||||||
| log(Ca/H) | ||||||||||||
| Parallax | [mas] | 2.78 (0.3) | 2.63 (0.4) | 2.78 (0.3) | ||||||||
| Distance | [pc] | 360.27 (37) | 379.73 (63) | 400.00 | 360.27 (37) | |||||||
| Composition | ||||||||||||
| Proper motion (right ascension) | [mas/yr] | 0.346753065 (0.3) | -0.19370934 (0.7) | 0.347 (0.3) | ||||||||
| Proper motion (declination) | [mas/yr] | -17.32080858 (0.2) | -18.20140187 (0.4) | -17.321 (0.2) | ||||||||
| 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 | 18.78 (0.02) | 18.78 (0.02) | 18.77 (0.02) | |||||||||
| g magnitude | 18.89 (0.009) | 18.89 (0.009) | 18.92 (0.02) | |||||||||
| r magnitude | 19.22 (0.01) | 19.22 (0.01) | 19.24 (0.01) | |||||||||
| i magnitude | 19.46 (0.02) | 19.46 (0.02) | 19.47 (0.02) | |||||||||
| z magnitude | 19.56 (0.07) | 19.55 (0.07) | 19.58 (0.06) | |||||||||
| G magnitude | 19.06 (0.03) | 19.10 | 19.06 (0.004) | |||||||||
| BP magnitude | 18.95 (0.03) | 18.71 | ||||||||||
| RP magnitude | 19.15 (0.04) | 19.08 | ||||||||||
| Pan g magnitude | 18.94 (0.004) | |||||||||||
| Pan r magnitude | 19.22 (0.008) | |||||||||||
| Pan i magnitude | 19.50 (0.02) | |||||||||||
| Pan z magnitude | 19.79 (0.03) | |||||||||||
| Pan y magnitude | 19.86 (0.03) | |||||||||||
| E(B-V) | 0.022 | |||||||||||
* 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.