All names: GALEX J164050.9+642445, PG1640+645, PG 1640+645, UCAC4 773-039056, Gaia EDR3 1634908820534152832, Gaia DR2 1634908820534152832, SDSS J164050.70+642445.0, TIC 198279418, 2MASS J16405069+6424450, FBS 1640+645, WISE J164050.68+642444.7, WISEA J164050.66+642444.8, FBS B 744, Gaia DR3 1634908820534152832
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 16 40 50.70 (0.03) | 16 40 50.69 | 16 40 50.69 (0.03) | ||
| Declination | 64 24 45.06 (0.03) | 64 24 45.29 | 64 24 45.15 (0.03) | ||
| Spectral type | sdOB | sdB0VIIHe9 | |||
| 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] | 0.91 (0.03) | 0.91 (0.04) | 0.91 (0.03) | |
| Distance | [pc] | 1099.02 (37) | 1093.73 (49) | 1099.02 (37) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | 4.052 (0.04) | 4.074 (0.07) | 4.052 (0.04) | |
| Proper motion (declination) | [mas/yr] | -5.376 (0.04) | -5.22 (0.09) | -5.376 (0.04) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 14.69 (0.02) | ||||
| V magnitude | 14.92 (0.04) | ||||
| R magnitude | 15.39 (0.2) | ||||
| I magnitude | |||||
| J magnitude | 15.47 (0.06) | 15.47 (0.06) | |||
| H magnitude | 15.83 (0.2) | 15.83 (0.2) | |||
| K magnitude | 15.48 (0.2) | 15.48 (0.2) | |||
| u magnitude | 14.45 (0.004) | ||||
| g magnitude | 14.70 (0.003) | ||||
| r magnitude | 15.16 (0.003) | ||||
| i magnitude | 15.48 (0.004) | ||||
| z magnitude | 15.78 (0.006) | ||||
| G magnitude | 14.91 (0.003) | 14.92 (0.0005) | 14.91 (0.003) | ||
| BP magnitude | 14.77 (0.003) | 14.71 (0.004) | |||
| RP magnitude | 15.15 (0.004) | 15.15 (0.002) | |||
| Pan g magnitude | 14.78 (0.005) | ||||
| Pan r magnitude | 15.15 (0.002) | ||||
| Pan i magnitude | 15.49 (0.002) | ||||
| Pan z magnitude | 15.76 (0.003) | ||||
| Pan y magnitude | 15.94 (0.004) | ||||
| E(B-V) | 0.023 | ||||
* 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.