All names: SDSS J083031.98+274758.7, Gaia DR2 704186654415540480, Gaia DR3 704186654415540480, GALEX J083032.0+274759, Gaia EDR3 704186654415540480
| Parameter | Unit | Gaia EDR3 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 08 30 31.99 (0.4) | 08 30 31.98 (0.4) | ||
| Declination | 27 47 58.59 (0.3) | 27 47 58.85 (0.3) | ||
| 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] | 2.96 (0.4) | 2.96 (0.4) | |
| Distance | [pc] | 337.86 (51) | 337.86 (51) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 12.185 (0.4) | 12.185 (0.4) | |
| Proper motion (declination) | [mas/yr] | -16.14 (0.3) | -16.14 (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 | 19.72 (0.04) | |||
| g magnitude | 19.83 (0.02) | |||
| r magnitude | 20.02 (0.02) | |||
| i magnitude | 20.26 (0.04) | |||
| z magnitude | 20.73 (0.2) | |||
| G magnitude | 19.85 (0.005) | 19.85 (0.005) | ||
| BP magnitude | 19.76 (0.04) | |||
| RP magnitude | 19.82 (0.07) | |||
| Pan g magnitude | ||||
| Pan r magnitude | ||||
| Pan i magnitude | ||||
| Pan z magnitude | ||||
| Pan y magnitude | ||||
| E(B-V) | 0.021 | |||
* 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.