All names: SDSS J202804.53+780702.4, SDSS J202804.53+780702.3, Gaia DR3 2290955072019049472, SDSS J202804.52+780702.2, Gaia DR2 2290955072019049472, Gaia EDR3 2290955072019049472, GALEX J202804.4+780703
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Gaia DR2 | Stilism | Simbad | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 20 28 04.56 (0.6) | 20 28 04.52 | 20 28 04.56 (0.7) | 20 28 04.52 (0.6) | 20 28 04.53 | ||||
| Declination | 78 07 02.29 (0.7) | 78 07 02.30 | 78 07 02.29 (1) | 78 07 02.39 (0.7) | 78 07 02.34 | ||||
| Spectral type | DA | DA | DA | ||||||
| Effective temperature | [K] | 15965.0 (5021) | |||||||
| log(g) | [cgs] | 8.06 (0.4) | |||||||
| Mass | [M☉] | 0.646 (0.2) | |||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 1.11 (0.7) | 1.33 (0.8) | 1.11 (0.7) | |||||
| Distance | [pc] | 898.27 (569) | 752.23 (455) | 898.23 (569) | |||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | 7.264946123 (0.8) | 6.835607543 (2) | 7.265 (0.8) | |||||
| Proper motion (declination) | [mas/yr] | -6.445004731 (1) | -8.97489177 (2) | -6.445 (1) | |||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | |||||||||
| V magnitude | |||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 20.99 (0.1) | 20.99 (0.1) | 21.01 (0.1) | ||||||
| g magnitude | 20.66 (0.03) | 20.66 (0.03) | 20.68 (0.03) | ||||||
| r magnitude | 20.77 (0.04) | 20.78 (0.04) | 20.77 (0.04) | ||||||
| i magnitude | 20.92 (0.06) | 20.91 (0.06) | 20.91 (0.06) | ||||||
| z magnitude | 21.13 (0.3) | 21.17 (0.3) | 21.17 (0.3) | ||||||
| G magnitude | 20.66 (0.1) | 20.75 | 20.66 (0.009) | ||||||
| BP magnitude | 20.60 (0.1) | 20.70 | |||||||
| RP magnitude | 20.58 (0.2) | 20.37 | |||||||
| Pan g magnitude | 20.66 (0.03) | ||||||||
| Pan r magnitude | 20.75 (0.05) | ||||||||
| Pan i magnitude | 20.97 (0.03) | ||||||||
| Pan z magnitude | 21.30 (0.2) | ||||||||
| Pan y magnitude | |||||||||
| E(B-V) | 0.205 | ||||||||
* 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.