All names: 2MASS J16593222+0743314, PG 1657+078, PG1657+078, GSC 00976-01448, TIC 276974201, Gaia DR3 4441577864373220736, UCAC2 34484060, GALEX J165932.1+074331, Gaia DR2 4441577864372234752
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 16 59 32.20 | 16 59 32.22 (0.03) | ||
| Declination | 07 43 32.41 | 07 43 31.41 (0.03) | ||
| 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] | 0.62 (0.06) | 0.67 (0.04) | |
| Distance | [pc] | 1615.51 (144) | 1500.83 (100) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -1.547 (0.08) | -1.366 (0.05) | |
| Proper motion (declination) | [mas/yr] | -18.391 (0.08) | -18.301 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 14.88 (0.004) | |||
| V magnitude | 15.02 (0.004) | |||
| R magnitude | 15.10 (0.004) | |||
| I magnitude | 15.12 (0.03) | |||
| J magnitude | 15.45 (0.06) | 15.45 (0.06) | ||
| H magnitude | 15.51 (0.1) | 15.51 (0.1) | ||
| K magnitude | 15.43 (0.2) | 15.43 (0.2) | ||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 14.97 (0.0005) | 14.97 (0.003) | ||
| BP magnitude | 14.83 (0.005) | |||
| RP magnitude | 15.11 (0.002) | |||
| Pan g magnitude | 14.84 (0.005) | |||
| Pan r magnitude | 15.16 (0.002) | |||
| Pan i magnitude | 15.46 (0.002) | |||
| Pan z magnitude | 15.68 (0.002) | |||
| Pan y magnitude | 15.83 (0.003) | |||
| E(B-V) | 0.108 | |||
* 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.