All names: SDSS J201822.90+754807.6, SDSS J201822.88+754807.6, Gaia DR2 2290151676910401024, Gaia DR3 2290151676910401024, GALEX J201823.2+754807, Gaia EDR3 2290151676910401024
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Gaia DR2 | Stilism | Simbad | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|
| Right ascension | 20 18 22.89 (0.4) | 20 18 22.89 (0.5) | 20 18 22.89 (0.4) | 20 18 22.90 | |||
| Declination | 75 48 07.65 (0.4) | 75 48 07.65 (0.6) | 75 48 07.70 (0.4) | 75 48 07.62 | |||
| Spectral type | DAH | DAH | |||||
| Effective temperature | [K] | 14694.0 (3140) | |||||
| log(g) | [cgs] | 7.94 (0.2) | |||||
| Mass | [M☉] | ||||||
| log(Luminosity) | [L☉] | ||||||
| Cooling age | [Gyr] | ||||||
| log(H/He) | |||||||
| log(C/He) | |||||||
| log(Ca/He) | |||||||
| log(Ca/H) | |||||||
| Parallax | [mas] | 1.04 (0.4) | 0.58 (0.5) | 1.04 (0.4) | |||
| Distance | [pc] | 963.79 (337) | 1724.73 (1392) | 963.76 (337) | |||
| Composition | |||||||
| Proper motion (right ascension) | [mas/yr] | -1.589283241 (0.6) | -1.736 (0.9) | -1.589 (0.6) | |||
| Proper motion (declination) | [mas/yr] | -3.230098159 (0.5) | -3.097 (1) | -3.23 (0.5) | |||
| Variability | |||||||
| Magnetic | |||||||
| Bd | [MG] | ||||||
| Infrared excess (disk) | |||||||
| Binarity | |||||||
| B magnitude | |||||||
| V magnitude | |||||||
| R magnitude | |||||||
| I magnitude | |||||||
| J magnitude | |||||||
| H magnitude | |||||||
| K magnitude | |||||||
| u magnitude | 20.77 (0.09) | 20.77 (0.09) | |||||
| g magnitude | 20.32 (0.03) | 20.32 (0.03) | |||||
| r magnitude | 20.31 (0.03) | 20.31 (0.03) | |||||
| i magnitude | 20.52 (0.06) | 20.52 (0.06) | |||||
| z magnitude | 20.48 (0.2) | 20.48 (0.2) | |||||
| G magnitude | 20.25 (0.09) | 20.30 | 20.25 (0.006) | ||||
| BP magnitude | 20.28 (0.09) | 20.21 | |||||
| RP magnitude | 19.95 (0.09) | 19.91 | |||||
| Pan g magnitude | 20.28 (0.02) | ||||||
| Pan r magnitude | 20.34 (0.03) | ||||||
| Pan i magnitude | 20.38 (0.03) | ||||||
| Pan z magnitude | 20.19 (0.04) | ||||||
| Pan y magnitude | |||||||
| E(B-V) | 0.174 | ||||||
* 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.