All names: 2MASS J19393989+4228019, Gaia DR3 2077927619019716096, Gaia DR2 2077927619019716096, UCAC4 663-079060, TIC 271345879, KPD 1938+4220, KPD1938+4220
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 19 39 39.94 | 19 39 39.90 (0.03) | ||
| Declination | 42 28 01.79 | 42 28 01.90 (0.03) | ||
| Spectral type | sdO | 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] | 0.30 (0.04) | 0.23 (0.03) | |
| Distance | [pc] | 3370.41 (478) | 4364.91 (594) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -6.543 (0.07) | -6.417 (0.04) | |
| Proper motion (declination) | [mas/yr] | 2.656 (0.07) | 2.776 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 15.32 (0.06) | |||
| V magnitude | 15.70 (0.08) | |||
| R magnitude | 15.94 (0.2) | |||
| I magnitude | ||||
| J magnitude | 16.05 (0.09) | 16.05 (0.09) | ||
| H magnitude | 15.91 | |||
| K magnitude | 16.49 | |||
| u magnitude | ||||
| g magnitude | 15.32 (0.03) | |||
| r magnitude | 15.89 (0.07) | |||
| i magnitude | 16.22 (0.07) | |||
| z magnitude | ||||
| G magnitude | 15.57 (0.0007) | 15.55 (0.003) | ||
| BP magnitude | 15.39 (0.007) | |||
| RP magnitude | 15.70 (0.004) | |||
| Pan g magnitude | 15.46 (0.001) | |||
| Pan r magnitude | 15.77 (0.003) | |||
| Pan i magnitude | 16.06 (0.003) | |||
| Pan z magnitude | 16.27 (0.003) | |||
| Pan y magnitude | 16.43 (0.004) | |||
| E(B-V) | 0.118 | |||
* 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.