All names: WISE J203900.51-044240.9, GALEX J203900.4-044241, 2MASS J20390050-0442407, SDSS J203900.50-044240.8, GALEXJ20390-0442, UCAC2 30281655, Gaia DR3 6914530384555510656, UCAC4 427-117914, WISEA J203900.50-044240.8, DENIS J203900.5-044240, TIC 248105981, Gaia DR2 6914530384555510656
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 39 00.41 | 20 39 00.51 (0.03) | ||
| Declination | -04 42 41.68 | -04 42 40.84 (0.02) | ||
| Spectral type | He-sdOB | sdOBHe | ||
| 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] | 0.69 (0.05) | 0.77 (0.04) | |
| Distance | [pc] | 1449.49 (107) | 1298.70 (66) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 2.851 (0.09) | 2.829 (0.04) | |
| Proper motion (declination) | [mas/yr] | 4.415 (0.07) | 4.739 (0.04) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 14.21 (0.07) | |||
| V magnitude | ||||
| R magnitude | 14.81 (0.2) | |||
| I magnitude | 14.72 (0.03) | |||
| J magnitude | 15.08 (0.04) | 15.08 (0.04) | ||
| H magnitude | 15.07 (0.09) | 15.07 (0.09) | ||
| K magnitude | 15.25 (0.1) | 15.25 (0.1) | ||
| u magnitude | 13.79 (0.004) | |||
| g magnitude | 14.25 (0.08) | |||
| r magnitude | 14.62 (0.004) | 14.69 (0.05) | ||
| i magnitude | 14.96 (0.004) | 14.91 (0.09) | ||
| z magnitude | 15.26 (0.005) | |||
| G magnitude | 14.41 (0.0006) | 14.40 (0.003) | ||
| BP magnitude | 14.18 (0.006) | |||
| RP magnitude | 14.67 (0.002) | |||
| Pan g magnitude | 14.26 (0.002) | |||
| Pan r magnitude | 14.65 (0.002) | |||
| Pan i magnitude | 15.01 (0.001) | |||
| Pan z magnitude | 15.30 (0.002) | |||
| Pan y magnitude | 15.47 (0.003) | |||
| E(B-V) | 0.050 | |||
* 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.