All names: SDSS J082147.89+470721.46, Gaia DR3 930446699799892480, SDSS J082147.89+470721.4, Gaia EDR3 930446699799892480, Gaia DR2 930446699799892480, GALEX J082147.8+470721
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Gaia DR2 | Stilism | Kepler et al. 2016 | Simbad |
|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 21 47.88 (0.3) | 08 21 47.89 | 08 21 47.88 (0.3) | 08 21 47.89 (0.3) | ||||
| Declination | 47 07 21.33 (0.2) | 47 07 21.46 | 47 07 21.33 (0.2) | 47 07 21.40 (0.2) | ||||
| Spectral type | DA+M | DA+M | ||||||
| Effective temperature | [K] | 15262.0 (328) | ||||||
| log(g) | [cgs] | 7.86 (0.07) | ||||||
| Mass | [M☉] | 0.542 (0.03) | ||||||
| log(Luminosity) | [L☉] | |||||||
| Cooling age | [Gyr] | |||||||
| log(H/He) | ||||||||
| log(C/He) | ||||||||
| log(Ca/He) | ||||||||
| log(Ca/H) | ||||||||
| Parallax | [mas] | 1.90 (0.4) | 1.66 (0.4) | 1.90 (0.4) | ||||
| Distance | [pc] | 525.74 (98) | 604.02 (159) | 525.73 (98) | ||||
| Composition | ||||||||
| Proper motion (right ascension) | [mas/yr] | -4.740637434 (0.4) | -5.466733075 (0.6) | -4.741 (0.4) | ||||
| Proper motion (declination) | [mas/yr] | -4.891865175 (0.3) | -4.913592556 (0.5) | -4.892 (0.3) | ||||
| Variability | ||||||||
| Magnetic | ||||||||
| Bd | [MG] | |||||||
| Infrared excess (disk) | ||||||||
| Binarity | ||||||||
| B magnitude | ||||||||
| V magnitude | ||||||||
| R magnitude | ||||||||
| I magnitude | ||||||||
| J magnitude | ||||||||
| H magnitude | ||||||||
| K magnitude | ||||||||
| u magnitude | 20.10 (0.04) | 20.08 (0.04) | 20.09 (0.04) | |||||
| g magnitude | 19.70 (0.01) | 19.70 (0.03) | 19.70 (0.01) | |||||
| r magnitude | 19.80 (0.02) | 19.80 (0.03) | 19.80 (0.02) | |||||
| i magnitude | 19.48 (0.02) | 19.48 (0.02) | 19.48 (0.02) | |||||
| z magnitude | 18.92 (0.04) | 18.91 (0.05) | 18.92 (0.04) | |||||
| G magnitude | 19.59 (0.05) | 19.61 | 19.59 (0.004) | |||||
| BP magnitude | 19.89 (0.05) | 19.88 | ||||||
| RP magnitude | 19.18 (0.05) | 19.13 | ||||||
| Pan g magnitude | 19.74 (0.01) | |||||||
| Pan r magnitude | 19.86 (0.01) | |||||||
| Pan i magnitude | 19.52 (0.01) | |||||||
| Pan z magnitude | 19.09 (0.01) | |||||||
| Pan y magnitude | 18.80 (0.09) | |||||||
| E(B-V) | 0.033 | |||||||
* 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.