All names: Gaia DR2 1220206565345639936, SDSS J155420.97+253746.9, GALEX J155420.9+253747, Gaia EDR3 1220206565345639936, SDSS J155420.96+253746.8, Gaia DR3 1220206565345639936, SDSS J155420.97+253746.90
| Parameter | Unit | Gaia EDR3 | SDSS DR12 | Genest-Beaulieu & Bergeron 2019 (spectroscopic) | Genest-Beaulieu & Bergeron 2019 (photometric) | Gaia DR2 | Stilism | Simbad | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 15 54 20.96 (0.3) | 15 54 20.97 | 15 54 20.96 (0.4) | 15 54 20.96 (0.3) | 15 54 20.97 | |||||
| Declination | 25 37 46.71 (0.4) | 25 37 46.88 | 25 37 46.72 (0.5) | 25 37 46.88 (0.4) | 25 37 46.92 | |||||
| Spectral type | DB | DB | DB | |||||||
| Effective temperature | [K] | 17591.0 | 23531.0 | 17981.0 (565) | ||||||
| log(g) | [cgs] | 8.02 | 7.72 | 8.22 (0.2) | ||||||
| Mass | [M☉] | 0.604 | 0.462 | 0.721 (0.1) | ||||||
| log(Luminosity) | [L☉] | |||||||||
| Cooling age | [Gyr] | |||||||||
| log(H/He) | <-5.508 | |||||||||
| log(C/He) | ||||||||||
| log(Ca/He) | ||||||||||
| log(Ca/H) | ||||||||||
| Parallax | [mas] | 1.20 (0.5) | 0.87 (0.7) | 1.20 (0.5) | ||||||
| Distance | [pc] | 835.16 (356) | 1144.07 (919) | 835.14 (356) | ||||||
| Composition | ||||||||||
| Proper motion (right ascension) | [mas/yr] | -0.59329423 (0.4) | 1.467094403 (1) | -0.593 (0.4) | ||||||
| Proper motion (declination) | [mas/yr] | -10.6873163 (0.5) | -9.297428216 (1) | -10.687 (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 | 20.35 (0.04) | 20.35 (0.04) | 20.36 (0.05) | |||||||
| g magnitude | 20.35 (0.02) | 20.35 (0.02) | 20.38 (0.02) | |||||||
| r magnitude | 20.63 (0.03) | 20.63 (0.03) | 20.64 (0.04) | |||||||
| i magnitude | 20.73 (0.05) | 20.73 (0.05) | 20.76 (0.04) | |||||||
| z magnitude | 22.25 (0.5) | 22.25 (0.5) | 21.81 (0.3) | |||||||
| G magnitude | 20.46 (0.05) | 20.54 | 20.46 (0.005) | |||||||
| BP magnitude | 20.47 (0.05) | 20.33 | ||||||||
| RP magnitude | 20.21 (0.09) | 20.12 | ||||||||
| Pan g magnitude | ||||||||||
| Pan r magnitude | ||||||||||
| Pan i magnitude | ||||||||||
| Pan z magnitude | ||||||||||
| Pan y magnitude | ||||||||||
| E(B-V) | 0.042 | |||||||||
* 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.