All names: 2MASS J20404685+7614397, KUV 20417+7604, Gaia DR2 2278225441787850752, Gaia DR3 2278225441787850752, TIC 352412700, KUV20417+7604, GALEX J204046.7+761436, UCAC4 832-018828
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 40 46.89 | 20 40 46.86 (0.03) | ||
| Declination | 76 14 40.04 | 76 14 39.81 (0.03) | ||
| Spectral type | sdB | sdO | ||
| 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] | 2.06 (0.04) | 2.16 (0.03) | |
| Distance | [pc] | 484.73 (9) | 462.24 (6) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 1.235 (0.07) | 1.343 (0.03) | |
| Proper motion (declination) | [mas/yr] | 0.395 (0.07) | 0.419 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 12.65 (0.01) | |||
| V magnitude | 12.71 (0.01) | |||
| R magnitude | 12.90 (0.07) | |||
| I magnitude | ||||
| J magnitude | 13.06 (0.03) | 13.06 (0.03) | ||
| H magnitude | 13.14 (0.03) | 13.14 (0.03) | ||
| K magnitude | 13.21 (0.03) | 13.21 (0.03) | ||
| u magnitude | 13.01 (0.004) | |||
| g magnitude | 12.71 (0.002) | 12.61 (0.08) | ||
| r magnitude | 12.91 (0.004) | 12.88 (0.01) | ||
| i magnitude | 13.35 (0.002) | 13.14 (0.01) | ||
| z magnitude | 13.81 (0.005) | |||
| G magnitude | 12.75 (0.0006) | 12.73 (0.003) | ||
| BP magnitude | 12.62 (0.005) | |||
| RP magnitude | 12.86 (0.002) | |||
| Pan g magnitude | 12.72 | |||
| Pan r magnitude | 13.03 | |||
| Pan i magnitude | 13.26 | |||
| Pan z magnitude | 13.44 (0.003) | |||
| Pan y magnitude | 13.56 (0.006) | |||
| E(B-V) | 0.177 | |||
* 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.