All names: TIC 289622633, Gaia DR2 1635443217545772800, PG1657+656, UCAC4 778-031355, PG 1657+656, 2MASS J16572309+6531285, Gaia DR3 1635443217545772800
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 16 57 23.20 | 16 57 23.11 (0.04) | ||
| Declination | 65 31 29.13 | 65 31 28.68 (0.04) | ||
| Spectral type | sd | sdBO | ||
| 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] | 0.56 (0.07) | 0.42 (0.04) | |
| Distance | [pc] | 1786.03 (234) | 2365.18 (211) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -8.419 (0.1) | -8.123 (0.04) | |
| Proper motion (declination) | [mas/yr] | -7.423 (0.1) | -7.112 (0.05) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 16.20 (0.1) | |||
| V magnitude | 16.13 (0.09) | |||
| R magnitude | 16.23 (0.3) | |||
| I magnitude | ||||
| J magnitude | 15.99 (0.1) | 15.99 (0.1) | ||
| H magnitude | 15.60 (0.1) | 15.60 (0.1) | ||
| K magnitude | 15.49 | |||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 16.12 (0.0009) | 16.10 (0.003) | ||
| BP magnitude | 16.03 (0.004) | |||
| RP magnitude | 16.11 (0.003) | |||
| Pan g magnitude | 16.06 (0.002) | |||
| Pan r magnitude | 16.30 (0.003) | |||
| Pan i magnitude | 16.45 (0.003) | |||
| Pan z magnitude | 16.57 (0.005) | |||
| Pan y magnitude | 16.65 (0.006) | |||
| 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.