All names: UCAC4 493-147652, WISE J220102.26+083047.6, PG 2158+082, USNO-B1.0 0985-00614809, LAMOST J220102.25+083047.4, WISEA J220102.26+083047.4, SDSS J220102.26+083047.4, GALEX J220102.2+083050, GALEX J220102.2+083051, 2MASS J22010227+0830478, PG2158+082, Gaia DR3 2724882872133120512, Gaia DR2 2724882872133120512, TIC 257044138, UCAC2 34942605
| Parameter | Unit | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|
| Right ascension | 22 01 02.37 | 22 01 02.28 (0.03) | ||
| Declination | 08 30 49.65 | 08 30 47.91 (0.03) | ||
| Spectral type | He-sdO | sdO2VIIIHe40 | ||
| Effective temperature | [K] | 75050.0 (7590) | ||
| log(g) | [cgs] | 5.99 (0.2) | ||
| Mass | [M☉] | |||
| log(Luminosity) | [L☉] | |||
| Cooling age | [Gyr] | |||
| log(H/He) | ||||
| log(C/He) | ||||
| log(Ca/He) | ||||
| log(Ca/H) | ||||
| Parallax | [mas] | 1.04 (0.05) | 1.07 (0.03) | |
| Distance | [pc] | 965.81 (48) | 933.01 (26) | |
| Composition | ||||
| Proper motion (right ascension) | [mas/yr] | -23.57 (0.1) | -23.585 (0.04) | |
| Proper motion (declination) | [mas/yr] | -36.782 (0.09) | -36.705 (0.03) | |
| Variability | ||||
| Magnetic | ||||
| Bd | [MG] | |||
| Infrared excess (disk) | ||||
| Binarity | ||||
| B magnitude | 12.80 | |||
| V magnitude | 13.38 | |||
| R magnitude | 13.49 (0.2) | |||
| I magnitude | ||||
| J magnitude | 13.41 (0.02) | 13.41 (0.02) | ||
| H magnitude | 13.31 (0.03) | 13.31 (0.03) | ||
| K magnitude | 13.30 (0.04) | 13.30 (0.04) | ||
| u magnitude | 13.12 (0.003) | |||
| g magnitude | 13.07 (0.001) | |||
| r magnitude | 13.43 (0.002) | |||
| i magnitude | 16.16 (0.02) | |||
| z magnitude | 14.24 (0.008) | |||
| G magnitude | 13.13 (0.001) | 13.11 (0.003) | ||
| BP magnitude | 12.96 (0.01) | |||
| RP magnitude | 13.28 (0.002) | |||
| Pan g magnitude | 13.49 | |||
| Pan r magnitude | 13.35 (0.0004) | |||
| Pan i magnitude | 13.65 (0.02) | |||
| Pan z magnitude | 13.83 (0.002) | |||
| Pan y magnitude | 13.99 (0.0008) | |||
| E(B-V) | 0.055 | |||
* 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.