All names: Gaia DR2 638847660539063296, Gaia DR3 638847660539063296, SDSS J091804.27+222941.9, Gaia EDR3 638847660539063296, GALEX J091804.3+222941, SDSS J091804.27+222941.90
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Genest-Beaulieu & Bergeron 2019 (spectroscopic) | Gaia DR2 | Simbad | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 09 18 04.27 (0.8) | 09 18 04.27 | 09 18 04.27 (2) | 09 18 04.27 (0.8) | 09 18 04.27 | ||||
| Declination | 22 29 41.81 (0.7) | 22 29 41.89 | 22 29 41.82 (2) | 22 29 41.93 (0.7) | 22 29 41.93 | ||||
| Spectral type | DB | DB | DB+MS | ||||||
| Effective temperature | [K] | 30242.0 | 20630.0 (1790) | ||||||
| log(g) | [cgs] | 7.93 | 7.96 (0.2) | ||||||
| Mass | [M☉] | 0.581 | 0.573 (0.08) | ||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | <-3.419 | ||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | -0.44 (0.9) | |||||||
| Distance | [pc] | ||||||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -6.609425689 (1) | -6.609 (1) | ||||||
| Proper motion (declination) | [mas/yr] | -7.109401777 (1) | -7.109 (1) | ||||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | WDMS | ||||||||
| B magnitude | |||||||||
| V magnitude | |||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 20.35 (0.04) | 20.33 (0.04) | 20.33 (0.04) | ||||||
| g magnitude | 20.33 (0.02) | 20.33 (0.02) | 20.33 (0.02) | ||||||
| r magnitude | 20.56 (0.03) | 20.58 (0.03) | 20.58 (0.03) | ||||||
| i magnitude | 20.81 (0.06) | 20.83 (0.06) | 20.83 (0.06) | ||||||
| z magnitude | 20.70 (0.2) | 20.70 (0.2) | 20.70 (0.2) | ||||||
| G magnitude | 20.42 (0.1) | 20.52 | 20.42 (0.007) | ||||||
| BP magnitude | 20.45 (0.1) | 20.50 | |||||||
| RP magnitude | 20.34 (0.1) | 20.35 | |||||||
| Pan g magnitude | 20.35 (0.01) | ||||||||
| Pan r magnitude | 20.54 (0.02) | ||||||||
| Pan i magnitude | 20.83 (0.04) | ||||||||
| Pan z magnitude | 20.90 (0.03) | ||||||||
| Pan y magnitude | |||||||||
| 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.