All names: Gaia DR2 2291339110814195968, Gaia DR3 2291339110814195968, GALEX J195429.0+780053, Gaia EDR3 2291339110815627776, SDSS J195428.81+780053.60, SDSS J195428.81+780053.6
| Parameter | Unit | Gaia EDR3 | SDSS DR12 | Genest-Beaulieu & Bergeron 2019 (spectroscopic) | Genest-Beaulieu & Bergeron 2019 (photometric) | Gaia DR2 | Stilism | Simbad | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 19 54 29.72 (1) | 19 54 28.81 | 19 54 28.81 (2) | 19 54 28.81 (1) | 19 54 28.81 | ||||
| Declination | 78 00 51.54 (2) | 78 00 53.53 | 78 00 53.68 (1) | 78 00 53.65 (0.9) | 78 00 53.56 | ||||
| Spectral type | DB | DB | |||||||
| Effective temperature | [K] | 18036.0 | 24276.0 | 16650.0 (963) | |||||
| log(g) | [cgs] | 8.99 | 6.82 | 7.98 (0.4) | |||||
| Mass | [M☉] | 1.185 | 0.223 | 0.575 (0.2) | |||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | <-5.301 | ||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | -0.54 (1) | 0.44 (2) | 0.44 (2) | |||||
| Distance | [pc] | 2250.14 (11481) | 2250.23 (11482) | ||||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -2.257979051 (2) | 0.642805869 (2) | 0.243 (1) | |||||
| Proper motion (declination) | [mas/yr] | -1.475581662 (2) | 3.489324694 (3) | 2.321 (1) | |||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | |||||||||
| V magnitude | |||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 20.63 (0.07) | 20.67 (0.08) | 20.67 (0.08) | ||||||
| g magnitude | 20.65 (0.03) | 20.64 (0.03) | 20.64 (0.03) | ||||||
| r magnitude | 20.91 (0.05) | 20.88 (0.06) | 20.88 (0.06) | ||||||
| i magnitude | 21.10 (0.08) | 21.00 (0.07) | 21.00 (0.07) | ||||||
| z magnitude | 21.12 (0.3) | 20.80 (0.3) | 20.80 (0.3) | ||||||
| G magnitude | 20.76 (0.3) | 20.77 | 20.66 (0.01) | ||||||
| BP magnitude | 21.70 (0.3) | 20.61 | |||||||
| RP magnitude | 19.99 (0.1) | 20.46 | |||||||
| Pan g magnitude | |||||||||
| Pan r magnitude | |||||||||
| Pan i magnitude | |||||||||
| Pan z magnitude | |||||||||
| Pan y magnitude | |||||||||
| E(B-V) | 0.143 | ||||||||
* 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.