All names: GALEX J164846.9+352042, SDSS J164846.95+352042.94, FBS 1646+354, PG1646+354, FBS B 581, Gaia EDR3 1327036803023683712, SDSS J164846.95+352042.9, Gaia DR2 1327036803023683712, SDSS J164846.95+352043.0, USNO-B1.0 1253-00247311, PG 1646+354, Gaia DR3 1327036803023683712
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR10 | Geier 2020 | Gaia DR2 | Stilism | Kepler et al. 2015 | Simbad |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 48 46.95 (0.03) | 16 48 46.96 | 16 48 47.01 | 16 48 46.95 (0.05) | 16 48 46.96 (0.03) | ||||
| Declination | 35 20 43.09 (0.04) | 35 20 43.04 | 35 20 43.38 | 35 20 43.09 (0.06) | 35 20 43.13 (0.04) | ||||
| Spectral type | sdB | sdB | sdB | ||||||
| Effective temperature | [K] | 27520.0 (856) | 29911.0 (160) | ||||||
| log(g) | [cgs] | 5.64 (0.1) | 5.52 (0.03) | ||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 0.40 (0.04) | 0.34 (0.07) | 0.34 (0.07) | 0.40 (0.04) | ||||
| Distance | [pc] | 2498.55 (279) | 2960.33 (592) | 2960.33 (592) | 2498.75 (279) | ||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -10.73473282 (0.04) | -10.627 (0.1) | -10.627 (0.1) | -10.735 (0.04) | ||||
| Proper motion (declination) | [mas/yr] | -2.643378823 (0.06) | -2.662 (0.1) | -2.662 (0.1) | -2.643 (0.06) | ||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | 16.10 | ||||||||
| V magnitude | |||||||||
| R magnitude | 16.70 | ||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 16.04 (0.005) | 16.04 (0.005) | 16.05 (0.02) | 16.04 (0.005) | |||||
| g magnitude | 16.18 (0.004) | 16.18 (0.004) | 16.22 (0.01) | 16.18 (0.004) | |||||
| r magnitude | 16.69 (0.004) | 16.69 (0.004) | 16.70 (0.01) | 16.69 (0.004) | |||||
| i magnitude | 17.03 (0.006) | 17.03 (0.006) | 17.02 (0.01) | 17.03 (0.006) | |||||
| z magnitude | 17.37 (0.01) | 17.37 (0.01) | 17.36 (0.02) | 17.37 (0.01) | |||||
| G magnitude | 16.46 (0.004) | 16.49 (0.001) | 16.49 | 16.46 (0.003) | |||||
| BP magnitude | 16.33 (0.004) | 16.28 (0.008) | 16.28 | ||||||
| RP magnitude | 16.73 (0.006) | 16.72 (0.008) | 16.72 | ||||||
| Pan g magnitude | 16.29 (0.003) | 16.29 (0.003) | |||||||
| Pan r magnitude | 16.72 (0.004) | 16.72 (0.004) | |||||||
| Pan i magnitude | 17.05 (0.004) | 17.05 (0.004) | |||||||
| Pan z magnitude | 17.32 (0.004) | 17.32 (0.004) | |||||||
| Pan y magnitude | 17.48 (0.02) | 17.48 (0.02) | |||||||
| E(B-V) | 0.022 | ||||||||
* 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.