All names: SDSS J081712.31+225453.4, Ton 306, WISEA J081712.29+225453.7, SDSS J081712.31+225453.5, 2MASS J08171232+2254535, SDSS J081712.30+225453.4, GALEXJ08172+2254, UCAC2 39843428, TIC 14346839, Gaia DR2 677388055649732736, UCAC4 565-042812, WISE J081712.29+225453.8, Gaia DR3 677388055649732736, GALEX J081712.3+225454
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 08 17 12.33 | 08 17 12.32 (0.03) | ||
| Declination | 22 54 54.75 | 22 54 53.50 (0.02) | ||
| Spectral type | sdB | sdB | ||
| 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] | 0.73 (0.06) | 0.75 (0.03) | |
| Distance | [pc] | 1367.61 (106) | 1327.84 (61) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -1.523 (0.09) | -1.58 (0.04) | |
| Proper motion (declination) | [mas/yr] | -0.093 (0.06) | -0.098 (0.03) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 14.18 (0.02) | |||
| V magnitude | 14.33 (0.07) | |||
| R magnitude | 14.78 (0.09) | |||
| I magnitude | ||||
| J magnitude | 14.95 (0.04) | 14.95 (0.04) | ||
| H magnitude | 15.10 (0.07) | 15.10 (0.07) | ||
| K magnitude | 14.94 (0.09) | 14.94 (0.09) | ||
| u magnitude | 14.35 (0.004) | |||
| g magnitude | 14.51 (0.004) | 14.19 (0.04) | ||
| r magnitude | 14.77 (0.004) | 14.55 (0.05) | ||
| i magnitude | 15.07 (0.006) | 14.84 (0.01) | ||
| z magnitude | 15.20 (0.006) | |||
| G magnitude | 14.38 (0.0005) | 14.37 (0.003) | ||
| BP magnitude | 14.19 (0.008) | |||
| RP magnitude | 14.59 (0.002) | |||
| Pan g magnitude | 14.21 (0.004) | |||
| Pan r magnitude | 14.59 (0.003) | |||
| Pan i magnitude | 14.93 (0.001) | |||
| Pan z magnitude | 15.18 (0.002) | |||
| Pan y magnitude | 15.35 (0.002) | |||
| E(B-V) | 0.034 | |||
* 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.