All names: TIC 165858983, GALEX J084408.1+310209, PG 0841+312, UCAC4 606-044145, LAMOST J084408.20+310211.0, PG0841+312, SDSS J084408.20+310210.9, 2MASS J08440822+3102111, Ton 342, SDSS J084408.20+310211.0, Gaia DR3 706479277895031040, TIC 801419548, Gaia DR2 706479277895031040
| Parameter | Unit | Geier 2020 | Simbad |
|---|---|---|---|
| Right ascension | 08 44 08.21 | 08 44 08.20 (0.4) | |
| Declination | 31 02 11.45 | 31 02 10.91 (0.2) | |
| Spectral type | sdB | sdB+? | |
| Effective temperature | [K] | 29320.0 (340) | |
| log(g) | [cgs] | 5.39 (0.03) | |
| Mass | [M☉] | ||
| log(Luminosity) | [L☉] | ||
| Cooling age | [Gyr] | ||
| log(H/He) | |||
| log(C/He) | |||
| log(Ca/He) | |||
| log(Ca/H) | |||
| Parallax | [mas] | -1.98 (0.5) | 0.06 (0.5) |
| Distance | [pc] | 16000.00 (119603) | |
| Composition | |||
| Proper motion (right ascension) | [mas/yr] | -13.783 (0.6) | -6.447 (0.5) |
| Proper motion (declination) | [mas/yr] | 0.017 (0.4) | -5.293 (0.4) |
| Variability | |||
| Magnetic | |||
| Bd | [MG] | ||
| Infrared excess (disk) | |||
| Binarity | |||
| B magnitude | 14.48 (0.06) | ||
| V magnitude | 14.60 (0.06) | ||
| R magnitude | 14.47 (0.1) | ||
| I magnitude | |||
| J magnitude | 14.19 (0.03) | 14.19 (0.03) | |
| H magnitude | 13.86 (0.04) | 13.86 (0.04) | |
| K magnitude | 13.83 (0.05) | 13.83 (0.05) | |
| u magnitude | 14.28 (0.003) | 14.29 (0.003) | |
| g magnitude | 14.35 (0.003) | 14.35 (0.003) | |
| r magnitude | 14.63 (0.003) | 14.63 (0.003) | |
| i magnitude | 14.78 (0.003) | 14.78 (0.003) | |
| z magnitude | 14.89 (0.004) | 14.89 (0.004) | |
| G magnitude | 14.56 (0.003) | 14.64 (0.005) | |
| BP magnitude | 14.42 (0.004) | ||
| RP magnitude | 14.48 (0.002) | ||
| Pan g magnitude | 14.44 (0.003) | ||
| Pan r magnitude | 14.69 (0.002) | ||
| Pan i magnitude | 14.85 (0.004) | ||
| Pan z magnitude | 14.98 (0.004) | ||
| Pan y magnitude | 15.06 (0.005) | ||
| E(B-V) | |||
* 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.