All names: UCAC4 410-134710, WISEA J202505.91-080418.3, GALEX J202506.0-080419, Gaia DR3 6906152621346929280, TIC 157440904, UCAC2 29012349, WISE J202505.91-080418.2, GALEXJ20251-0804, 2MASS J20250590-0804180, Gaia DR2 6906152621346929280
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 20 25 06.04 | 20 25 05.91 (0.04) | ||
| Declination | -08 04 19.97 | -08 04 18.18 (0.03) | ||
| Spectral type | He-sdO | sdOC2VIIHe39 | ||
| 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] | 0.25 (0.06) | 0.36 (0.04) | |
| Distance | [pc] | 4055.15 (985) | 2790.18 (343) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | 2.279 (0.1) | 2.256 (0.04) | |
| Proper motion (declination) | [mas/yr] | -11.269 (0.06) | -11.22 (0.03) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 13.68 (0.06) | |||
| V magnitude | 14.00 (0.08) | |||
| R magnitude | 14.29 (0.09) | |||
| I magnitude | ||||
| J magnitude | 14.55 (0.04) | 14.55 (0.04) | ||
| H magnitude | 14.83 (0.08) | 14.83 (0.08) | ||
| K magnitude | 14.84 (0.1) | 14.84 (0.1) | ||
| u magnitude | ||||
| g magnitude | 13.70 (0.02) | |||
| r magnitude | 14.18 (0.02) | |||
| i magnitude | 14.65 (0.02) | |||
| z magnitude | ||||
| G magnitude | 13.88 (0.0008) | 13.87 (0.003) | ||
| BP magnitude | 13.64 (0.008) | |||
| RP magnitude | 14.17 (0.002) | |||
| Pan g magnitude | 17.82 (0.02) | |||
| Pan r magnitude | ||||
| Pan i magnitude | ||||
| Pan z magnitude | 17.30 (0.07) | |||
| Pan y magnitude | ||||
| E(B-V) | 0.078 | |||
* 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.