All names: TIC 236746939, SDSS J165901.56+290234.5, UCAC4 596-056983, 2MASS J16590155+2902341, Gaia DR2 1309437641952913920, LAMOST J165901.59+290234.4, PG1657+291, PG 1657+291, GALEX J165901.5+290234, Gaia DR3 1309437641952913920
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 16 59 01.57 | 16 59 01.57 (0.03) | ||
| Declination | 29 02 34.59 | 29 02 34.54 (0.03) | ||
| Spectral type | sdB | sdB | ||
| Effective temperature | [K] | 27720.0 (700) | ||
| log(g) | [cgs] | 5.61 (0.1) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.48 (0.05) | 0.37 (0.04) | |
| Distance | [pc] | 2079.43 (214) | 2682.40 (278) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -3.732 (0.08) | -3.662 (0.04) | |
| Proper motion (declination) | [mas/yr] | 0.797 (0.08) | 0.849 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 15.96 (0.04) | |||
| V magnitude | 16.10 (0.01) | |||
| R magnitude | 16.30 (0.1) | |||
| I magnitude | ||||
| J magnitude | 16.82 (0.1) | 16.82 (0.1) | ||
| H magnitude | 16.35 | |||
| K magnitude | 17.04 | |||
| u magnitude | 15.72 (0.005) | |||
| g magnitude | 15.82 (0.004) | 15.92 (0.01) | ||
| r magnitude | 16.31 (0.005) | 16.36 (0.01) | ||
| i magnitude | 16.64 (0.005) | |||
| z magnitude | 16.95 (0.01) | |||
| G magnitude | 16.11 (0.001) | 16.08 (0.003) | ||
| BP magnitude | 15.91 (0.007) | |||
| RP magnitude | 16.33 (0.005) | |||
| Pan g magnitude | 15.90 (0.004) | |||
| Pan r magnitude | 16.32 (0.007) | |||
| Pan i magnitude | 16.67 (0.003) | |||
| Pan z magnitude | 16.92 (0.005) | |||
| Pan y magnitude | 17.11 (0.005) | |||
| E(B-V) | 0.027 | |||
* 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.