All names: Gaia DR2 1949954704743455104, 2MASS J21572699+3740188, FBS 2155+374, FBS B 173, GALEX J215727.0+374018, FBS2155+374, Gaia DR3 1949954704743455104, TIC 256785606
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 21 57 27.08 | 21 57 27.00 (0.01) | ||
| Declination | 37 40 17.79 | 37 40 18.80 (0.02) | ||
| Spectral type | sdB+MS | 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] | 0.13 (0.03) | 0.14 (0.02) | |
| Distance | [pc] | 7818.61 (1785) | 6896.55 (932) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -2.834 (0.03) | -2.758 (0.01) | |
| Proper motion (declination) | [mas/yr] | -3.705 (0.04) | -3.822 (0.02) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | ||||
| V magnitude | ||||
| R magnitude | ||||
| I magnitude | ||||
| J magnitude | 14.06 (0.03) | 14.06 (0.03) | ||
| H magnitude | 14.19 (0.04) | 14.19 (0.04) | ||
| K magnitude | 13.96 (0.06) | 13.96 (0.06) | ||
| u magnitude | ||||
| g magnitude | ||||
| r magnitude | ||||
| i magnitude | ||||
| z magnitude | ||||
| G magnitude | 14.17 (0.0004) | 14.15 (0.003) | ||
| BP magnitude | 14.14 (0.003) | |||
| RP magnitude | 14.10 (0.004) | |||
| Pan g magnitude | 14.12 (0.002) | |||
| Pan r magnitude | 14.28 (0.003) | |||
| Pan i magnitude | 14.46 (0.002) | |||
| Pan z magnitude | 14.59 (0.006) | |||
| Pan y magnitude | 14.65 (0.006) | |||
| E(B-V) | 0.191 | |||
* 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.