All names: Gaia DR2 2257463088843223552, Gaia EDR3 2257463088843223552, SDSS J181721.78+653724.7, Gaia DR3 2257463088843223552, SDSS J181721.79+653725.0, GALEX J181721.8+653725
| Parameter | Unit | Gaia EDR3 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 18 17 21.77 (0.4) | 18 17 21.78 (0.4) | ||
| Declination | 65 37 24.40 (0.4) | 65 37 24.87 (0.4) | ||
| Spectral type | DB | |||
| Effective temperature | [K] | |||
| log(g) | [cgs] | |||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 2.80 (0.4) | 2.80 (0.4) | |
| Distance | [pc] | 357.18 (54) | 357.18 (54) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -2.036 (0.5) | -2.036 (0.5) | |
| Proper motion (declination) | [mas/yr] | -29.592 (0.4) | -29.592 (0.4) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | ||||
| V magnitude | ||||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | ||||
| H magnitude | ||||
| K magnitude | ||||
| u magnitude | 19.84 (0.04) | |||
| g magnitude | 19.85 (0.01) | |||
| r magnitude | 20.02 (0.02) | |||
| i magnitude | 20.25 (0.03) | |||
| z magnitude | 20.16 (0.1) | |||
| G magnitude | 19.91 (0.005) | 19.91 (0.005) | ||
| BP magnitude | 19.93 (0.08) | |||
| RP magnitude | 20.04 (0.1) | |||
| Pan g magnitude | ||||
| Pan r magnitude | ||||
| Pan i magnitude | ||||
| Pan z magnitude | ||||
| Pan y magnitude | ||||
| E(B-V) | 0.028 | |||
* 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.