All names: SDSSJ172816.87+074839.0, SDSS J172816.86+074838.9, Gaia DR3 4490139680904028160, SDSS J172816.86+074839.0, SDSS J172816.87+074839.0, GALEX J172816.8+074839, Gaia DR2 4490139680904028160
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 17 28 16.87 | 17 28 16.87 (0.1) | ||
| Declination | 07 48 39.00 | 07 48 39.03 (0.1) | ||
| Spectral type | sdB | sdB | ||
| Effective temperature | [K] | 30700.0 (700) | ||
| log(g) | [cgs] | 5.37 (0.09) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.18 (0.3) | 0.11 (0.2) | |
| Distance | [pc] | 5540.17 (8938) | 9082.65 (15616) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -3.701 (0.5) | -3.348 (0.2) | |
| Proper motion (declination) | [mas/yr] | -1.597 (0.6) | -1.418 (0.1) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | ||||
| V magnitude | ||||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | ||||
| H magnitude | ||||
| K magnitude | ||||
| u magnitude | 18.06 (0.01) | 18.06 (0.01) | ||
| g magnitude | 18.15 (0.007) | 18.15 (0.007) | ||
| r magnitude | 18.54 (0.009) | 18.54 (0.009) | ||
| i magnitude | 18.85 (0.01) | 18.85 (0.01) | ||
| z magnitude | 19.07 (0.04) | 19.07 (0.04) | ||
| G magnitude | 18.38 (0.003) | 18.36 (0.003) | ||
| BP magnitude | 18.20 (0.03) | |||
| RP magnitude | 18.56 (0.02) | |||
| Pan g magnitude | 18.22 (0.005) | |||
| Pan r magnitude | 18.57 (0.005) | |||
| Pan i magnitude | 18.86 (0.006) | |||
| Pan z magnitude | 19.09 (0.02) | |||
| Pan y magnitude | 19.21 (0.03) | |||
| E(B-V) | 0.150 | |||
* 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.