All names: SDSS J172125.76+090311.2, SDSSJ172125.76+090311.2, Gaia DR3 4491274930955326080, GALEX J172125.7+090311, 2MASS J17212577+0903113, LAMOST J172125.78+090311.6, UCAC4 496-071439, Gaia DR2 4491274930955326080
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 17 21 25.76 | 17 21 25.76 (0.03) | ||
| Declination | 09 03 11.24 | 09 03 11.28 (0.02) | ||
| Spectral type | sdB | sdB | ||
| Effective temperature | [K] | 26640.0 (490) | ||
| log(g) | [cgs] | 5.55 (0.04) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.61 (0.05) | 0.56 (0.04) | |
| Distance | [pc] | 1647.99 (134) | 1773.68 (114) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 0.077 (0.09) | 0.207 (0.04) | |
| Proper motion (declination) | [mas/yr] | -10.025 (0.08) | -10.016 (0.03) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 15.52 (0.01) | |||
| V magnitude | 15.43 (0.01) | |||
| R magnitude | 15.54 (0.2) | |||
| I magnitude | ||||
| J magnitude | 15.93 (0.09) | 15.93 (0.09) | ||
| H magnitude | 15.33 | |||
| K magnitude | 14.95 | |||
| u magnitude | 15.40 (0.005) | 15.41 (0.02) | ||
| g magnitude | 15.42 (0.003) | 15.43 (0.007) | ||
| r magnitude | 15.79 (0.004) | 15.46 (0.02) | ||
| i magnitude | 16.07 (0.004) | 15.51 (0.01) | ||
| z magnitude | 16.33 (0.008) | 16.32 (0.01) | ||
| G magnitude | 15.62 (0.0007) | 15.60 (0.003) | ||
| BP magnitude | 15.47 (0.006) | |||
| RP magnitude | 15.74 (0.005) | |||
| Pan g magnitude | 15.50 (0.004) | |||
| Pan r magnitude | 15.81 (0.005) | |||
| Pan i magnitude | 16.09 (0.003) | |||
| Pan z magnitude | 16.32 (0.003) | |||
| Pan y magnitude | 16.46 (0.006) | |||
| E(B-V) | 0.146 | |||
* 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.