All names: Gaia DR2 2257020574070558464, UCAC4 781-029379, 2MASS J18422497+6600401, Gaia EDR3 2257020574070558464, HS 1842+6557, TIC 229749925, KUV 18423+6558, GALEX J184224.9+660039, KUV18423+6558, Gaia DR3 2257020574070558464
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 18 42 24.95 (0.03) | 18 42 24.97 | 18 42 24.95 (0.03) | ||
| Declination | 66 00 40.10 (0.03) | 66 00 40.88 | 66 00 40.31 (0.03) | ||
| Spectral type | sdB | sdB | |||
| Effective temperature | [K] | 35500.0 (1500) | |||
| log(g) | [cgs] | 6.65 (0.5) | |||
| Mass | [M☉] | ||||
| log(Luminosity) | [L☉] | ||||
| Cooling age | [Gyr] | ||||
| log(H/He) | |||||
| log(C/He) | |||||
| log(Ca/He) | |||||
| log(Ca/H) | |||||
| Parallax | [mas] | 0.60 (0.03) | 0.65 (0.05) | 0.60 (0.03) | |
| Distance | [pc] | 1672.52 (88) | 1533.04 (113) | 1672.52 (88) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | -0.947 (0.05) | -1.483 (0.1) | -0.947 (0.05) | |
| Proper motion (declination) | [mas/yr] | -13.375 (0.04) | -13.113 (0.09) | -13.375 (0.04) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 15.40 (0.03) | ||||
| V magnitude | 15.66 (0.01) | ||||
| R magnitude | 16.01 (0.1) | ||||
| I magnitude | |||||
| J magnitude | 16.22 (0.1) | 16.22 (0.1) | |||
| H magnitude | 16.90 | ||||
| K magnitude | 16.49 | ||||
| u magnitude | |||||
| g magnitude | 15.40 (0.01) | ||||
| r magnitude | 15.87 (0.01) | ||||
| i magnitude | |||||
| z magnitude | |||||
| G magnitude | 15.63 (0.003) | 15.65 (0.0007) | 15.63 (0.003) | ||
| BP magnitude | 15.48 (0.003) | 15.41 (0.003) | |||
| RP magnitude | 15.91 (0.004) | 15.90 (0.002) | |||
| Pan g magnitude | 15.46 (0.004) | ||||
| Pan r magnitude | 15.89 (0.005) | ||||
| Pan i magnitude | 16.24 (0.003) | ||||
| Pan z magnitude | 16.53 (0.004) | ||||
| Pan y magnitude | 16.71 (0.007) | ||||
| E(B-V) | 0.043 | ||||
* 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.