All names: SDSS J084742.22+000647.6, SDSS J084742.21+000647.6, Gaia DR3 3075037365205590784, GALEX J084742.0+000647, WD 0845+002, SDSS J084742.23+000647.7, Gaia DR2 3075037360909362176
| Parameter | Unit | Pan-STARRS DR1 | SDSS DR12 | Gaia DR2 | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Kleinman et al. 2004 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 47 42.22 | 08 47 42.21 (2) | 08 47 42.21 (8) | 08 47 42.22 | 08 47 41.93 | 08 47 42.23 | 08 47 42.23 | ||
| Declination | 00 06 47.68 | 00 06 47.60 (3) | 00 06 47.67 (5) | 00 06 47.68 | 00 06 42.48 | 00 06 47.65 | 00 06 47.66 | ||
| Spectral type | DA+DB/DC | DAB | DA | DA:B: | |||||
| Effective temperature | [K] | 30545.0 (241) | 30620.0 (223) | ||||||
| log(g) | [cgs] | 8.49 (0.05) | 8.33 (0.06) | ||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | ||||||||
| Distance | [pc] | ||||||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -16.0 (3) | -15.0 | -14.0 | |||||
| Proper motion (declination) | [mas/yr] | -1.0 (3) | -2.6 | -3.0 | |||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | |||||||||
| V magnitude | |||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | 18.12 (0.05) | ||||||||
| H magnitude | 18.40 (0.1) | ||||||||
| K magnitude | |||||||||
| u magnitude | 17.80 (0.01) | 17.80 (0.01) | 17.82 (0.02) | 17.82 | 17.81 (0.02) | 17.82 (0.02) | |||
| g magnitude | 17.70 (0.005) | 17.70 (0.005) | 17.71 (0.02) | 17.71 | 17.70 (0.02) | 17.71 (0.02) | |||
| r magnitude | 17.99 (0.006) | 17.99 (0.006) | 18.02 (0.01) | 18.01 | 18.02 (0.01) | 18.01 (0.01) | |||
| i magnitude | 18.23 (0.009) | 18.23 (0.009) | 18.23 (0.02) | 18.23 | 18.24 (0.02) | 18.23 (0.02) | |||
| z magnitude | 18.50 (0.03) | 18.50 (0.03) | 18.53 (0.04) | 18.52 | 18.53 (0.04) | 18.52 (0.04) | |||
| G magnitude | 18.20 | 18.51 (0.01) | |||||||
| BP magnitude | 17.80 | ||||||||
| RP magnitude | 17.93 | ||||||||
| Pan g magnitude | 17.78 (0.01) | ||||||||
| Pan r magnitude | 18.01 (0.009) | ||||||||
| Pan i magnitude | 18.27 (0.005) | ||||||||
| Pan z magnitude | 18.49 (0.02) | ||||||||
| Pan y magnitude | 18.73 (0.02) | ||||||||
| E(B-V) | |||||||||
* 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.