All names: Gaia DR2 659854860980026624, WD 0844+176, Gaia EDR3 659854860980026624, USNO-B1.0 1074-00197890, Gaia DR3 659854860980026624, SDSS J084732.74+172819.1, GALEX J084732.6+172818
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Gaia DR2 | Stilism | Vincent et al. 2024 | Simbad | White Dwarf Catalog (McCook & Sion 1999) | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 47 32.77 (0.2) | 08 47 32.74 | 08 47 32.77 (0.3) | 08 47 32.77 | 08 47 32.74 (0.2) | 08 47 32.57 | ||||
| Declination | 17 28 18.49 (0.1) | 17 28 19.11 | 17 28 18.52 (0.2) | 17 28 18.49 | 17 28 19.50 (0.1) | 17 28 19.56 | ||||
| Spectral type | DQ: | DC | ? | DQ | ||||||
| Effective temperature | [K] | 7445.0 (199) | ||||||||
| log(g) | [cgs] | 7.99 (0.06) | ||||||||
| Mass | [M☉] | 0.569 (0.05) | ||||||||
| log(Luminosity) | [L☉] | |||||||||
| Cooling age | [Gyr] | |||||||||
| log(H/He) | ||||||||||
| log(C/He) | ||||||||||
| log(Ca/He) | ||||||||||
| log(Ca/H) | ||||||||||
| Parallax | [mas] | 7.09 (0.2) | 7.12 (0.3) | 7.09 | 7.09 (0.2) | |||||
| Distance | [pc] | 140.97 (5) | 140.45 (7) | 140.97 | 140.97 (5) | |||||
| Composition | ||||||||||
| Proper motion (right ascension) | [mas/yr] | 34.88411229 (0.2) | 34.08303616 (0.6) | 34.884 (0.2) | ||||||
| Proper motion (declination) | [mas/yr] | -63.24376102 (0.2) | -63.12072253 (0.4) | -63.244 (0.2) | ||||||
| Variability | ||||||||||
| Magnetic | ||||||||||
| Bd | [MG] | |||||||||
| Infrared excess (disk) | ||||||||||
| Binarity | ||||||||||
| B magnitude | 19.70 | |||||||||
| V magnitude | ||||||||||
| R magnitude | 19.00 | |||||||||
| I magnitude | ||||||||||
| J magnitude | ||||||||||
| H magnitude | ||||||||||
| K magnitude | ||||||||||
| u magnitude | 19.42 (0.03) | 19.42 (0.03) | ||||||||
| g magnitude | 19.09 (0.01) | 19.10 (0.01) | ||||||||
| r magnitude | 19.05 (0.01) | 19.05 (0.01) | ||||||||
| i magnitude | 19.05 (0.01) | 19.05 (0.01) | ||||||||
| z magnitude | 19.20 (0.05) | 19.20 (0.05) | ||||||||
| G magnitude | 19.00 (0.03) | 19.04 | 19.00 | 19.00 (0.004) | ||||||
| BP magnitude | 19.17 (0.03) | 19.01 | ||||||||
| RP magnitude | 18.82 (0.04) | 18.73 | ||||||||
| Pan g magnitude | 19.12 (0.009) | |||||||||
| Pan r magnitude | 19.05 (0.005) | |||||||||
| Pan i magnitude | 19.09 (0.009) | |||||||||
| Pan z magnitude | 19.20 (0.01) | |||||||||
| Pan y magnitude | 19.29 (0.1) | |||||||||
| E(B-V) | 0.006 | |||||||||
* 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.