All names: PG 1707+657, Gaia DR2 1632504772720376320, PG1707+657, FBS B 849, FBS 1707+657, 2MASS J17071422+6540254, UCAC4 779-028518, Gaia EDR3 1632504772720376320, WISE J170714.23+654025.4, AP J17071422+6540254, WISEA J170714.22+654025.5, SDSS J170714.25+654025.5, Gaia DR3 1632504772720376320, TIC 307956955
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Geier 2020 | Gaia DR2 | Stilism | Simbad | Eisenstein et al. 2006 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 17 07 14.25 (0.05) | 17 07 14.26 | 17 07 14.28 | 17 07 14.25 (0.07) | 17 07 14.25 (0.05) | 17 07 14.25 | |||
| Declination | 65 40 25.61 (0.04) | 65 40 25.56 | 65 40 25.31 | 65 40 25.61 (0.07) | 65 40 25.54 (0.04) | 65 40 25.55 | |||
| Spectral type | sdB | sdB0.2VIIHe9 | SDB | ||||||
| Effective temperature | [K] | 35923.0 (179) | |||||||
| log(g) | [cgs] | 5.55 (0.03) | |||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 0.36 (0.05) | 0.49 (0.08) | 0.49 (0.08) | 0.36 (0.05) | ||||
| Distance | [pc] | 2811.97 (394) | 2053.81 (342) | 2053.96 (342) | 2812.15 (395) | ||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -1.100404432 (0.06) | -1.206 (0.1) | -1.206176549 (0.1) | -1.1 (0.06) | 0.1 | |||
| Proper motion (declination) | [mas/yr] | 4.399976376 (0.05) | 4.326 (0.1) | 4.326040142 (0.1) | 4.4 (0.05) | 4.5 | |||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 16.17 (0.09) | ||||||||
| V magnitude | 16.13 (0.06) | ||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | 16.29 (0.1) | 16.29 (0.1) | |||||||
| H magnitude | 15.53 (0.1) | 15.53 (0.1) | |||||||
| K magnitude | 15.71 (0.2) | 15.71 (0.2) | |||||||
| u magnitude | 15.72 (0.005) | 15.72 (0.005) | 15.72 (0.005) | 15.71 (0.02) | |||||
| g magnitude | 15.96 (0.003) | 15.96 (0.003) | 15.96 (0.003) | 15.99 (0.01) | |||||
| r magnitude | 16.38 (0.004) | 16.38 (0.004) | 16.38 (0.004) | 16.39 (0.01) | |||||
| i magnitude | 16.60 (0.004) | 16.60 (0.004) | 16.60 (0.004) | 16.61 (0.01) | |||||
| z magnitude | 16.76 (0.01) | 16.76 (0.01) | 16.76 (0.01) | 16.76 (0.02) | |||||
| G magnitude | 16.21 (0.002) | 16.24 (0.001) | 16.24 | 16.21 (0.003) | |||||
| BP magnitude | 16.13 (0.002) | 16.07 (0.004) | 16.07 | ||||||
| RP magnitude | 16.34 (0.003) | 16.33 (0.003) | 16.33 | ||||||
| Pan g magnitude | 16.12 (0.003) | 16.12 (0.003) | |||||||
| Pan r magnitude | 16.46 (0.005) | 16.46 (0.005) | |||||||
| Pan i magnitude | 16.68 (0.002) | 16.68 (0.002) | |||||||
| Pan z magnitude | 16.81 (0.005) | 16.81 (0.005) | |||||||
| Pan y magnitude | 16.92 (0.008) | 16.91 (0.008) | |||||||
| E(B-V) | 0.025 | ||||||||
* 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.