All names: WISE J181209.97+180754.1, UCAC4 541-070051, 2MASS J18120997+1807540, LAMOST J181210.00+180754.0, Gaia DR2 4526347084141410432, Gaia DR3 4526347084141410432, LAMOSTJ181209.99+180754.1, GALEX J181209.9+180754
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 18 12 10.01 | 18 12 09.99 (0.02) | ||
| Declination | 18 07 54.06 | 18 07 54.10 (0.03) | ||
| Spectral type | sdB | sdB | ||
| Effective temperature | [K] | 30170.0 (50) | ||
| log(g) | [cgs] | 5.41 (0.01) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 0.42 (0.05) | 0.53 (0.03) | |
| Distance | [pc] | 2403.27 (272) | 1881.11 (116) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -2.659 (0.08) | -2.503 (0.03) | |
| Proper motion (declination) | [mas/yr] | -9.658 (0.09) | -9.545 (0.03) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 15.25 (0.08) | |||
| V magnitude | 15.06 (0.04) | |||
| R magnitude | 15.71 (0.1) | |||
| I magnitude | ||||
| J magnitude | 15.04 (0.05) | 15.04 (0.05) | ||
| H magnitude | 14.54 (0.07) | 14.54 (0.07) | ||
| K magnitude | 14.62 (0.09) | 14.62 (0.09) | ||
| u magnitude | ||||
| g magnitude | 15.07 (0.09) | |||
| r magnitude | 14.97 (0.09) | |||
| i magnitude | 14.85 (0.05) | |||
| z magnitude | ||||
| G magnitude | 15.48 (0.0009) | 15.47 (0.003) | ||
| BP magnitude | 15.46 (0.006) | |||
| RP magnitude | 15.37 (0.003) | |||
| Pan g magnitude | 15.46 (0.005) | |||
| Pan r magnitude | 15.60 (0.002) | |||
| Pan i magnitude | 15.72 (0.003) | |||
| Pan z magnitude | 15.79 (0.007) | |||
| Pan y magnitude | 15.82 (0.006) | |||
| E(B-V) | 0.109 | |||
* 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.