All names: PG 1657+416, LAMOST J165841.83+413115.6, SDSS J165841.83+413115.6, Gaia DR2 1354579844177083904, UCAC4 658-061024, 2MASS J16584184+4131156, GALEX J165841.7+413114, SDSS J165841.83+413115.5, PG1657+416, Gaia DR3 1354579844177083904, TIC 82359147, Gaia EDR3 1354579844177083904
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Geier 2020 | Gaia DR2 | Stilism | Simbad | Eisenstein et al. 2006 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 58 41.82 (0.03) | 16 58 41.83 | 16 58 41.88 | 16 58 41.82 (0.03) | 16 58 41.84 (0.03) | 16 58 41.84 | |||
| Declination | 41 31 15.49 (0.03) | 41 31 15.53 | 41 31 15.50 | 41 31 15.49 (0.04) | 41 31 15.51 (0.03) | 41 31 15.62 | |||
| Spectral type | sdBV+G5 | sdB+G5 | SDB | ||||||
| Effective temperature | [K] | 32200.0 | 31599.0 (198) | ||||||
| log(g) | [cgs] | 5.80 | 5.00 (0.002) | ||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 0.41 (0.03) | 0.58 (0.04) | 0.58 (0.04) | 0.41 (0.03) | ||||
| Distance | [pc] | 2426.42 (180) | 1717.33 (127) | 1717.22 (127) | 2426.60 (180) | ||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -8.895579625 (0.03) | -9.115 (0.07) | -9.1146002 (0.07) | -8.896 (0.03) | -8.6 | |||
| Proper motion (declination) | [mas/yr] | -1.311033358 (0.04) | -1.451 (0.1) | -1.451214672 (0.1) | -1.311 (0.04) | 1.1 | |||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 16.07 (0.01) | ||||||||
| V magnitude | 16.23 (0.01) | ||||||||
| R magnitude | 16.45 | ||||||||
| I magnitude | |||||||||
| J magnitude | 15.80 (0.07) | 15.80 (0.07) | |||||||
| H magnitude | 15.64 (0.1) | 15.64 | |||||||
| K magnitude | 15.17 (0.1) | 15.13 | |||||||
| u magnitude | 15.89 (0.005) | 15.89 (0.005) | 15.89 (0.005) | 15.84 (0.01) | |||||
| g magnitude | 15.95 (0.004) | 15.95 (0.004) | 15.95 (0.004) | 15.93 (0.02) | |||||
| r magnitude | 16.17 (0.004) | 16.17 (0.004) | 16.17 (0.004) | 16.14 (0.01) | |||||
| i magnitude | 16.29 (0.005) | 16.29 (0.005) | 16.29 (0.005) | 16.27 (0.02) | |||||
| z magnitude | 16.40 (0.008) | 16.40 (0.008) | 16.40 (0.008) | 16.36 (0.02) | |||||
| G magnitude | 15.99 (0.003) | 16.01 (0.001) | 16.01 | 15.99 (0.003) | |||||
| BP magnitude | 15.99 (0.003) | 15.95 (0.007) | 15.95 | ||||||
| RP magnitude | 15.94 (0.003) | 15.94 (0.005) | 15.94 | ||||||
| Pan g magnitude | 15.97 (0.002) | 15.97 (0.002) | |||||||
| Pan r magnitude | 16.16 (0.003) | 16.16 (0.003) | |||||||
| Pan i magnitude | 16.28 (0.004) | 16.28 (0.004) | |||||||
| Pan z magnitude | 16.38 (0.004) | 16.38 (0.004) | |||||||
| Pan y magnitude | 16.43 (0.008) | 16.43 (0.008) | |||||||
| E(B-V) | 0.024 | ||||||||
* 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.