All names: USNO-B1.0 1068-00600152, SDSS J204940.85+165003.6, GALEX J204940.8+165004, SDSS J204940.86+165003.5, Gaia DR3 1764643388666407808, Gaia EDR3 1764643388666407808, Gaia DR2 1764643388666407808, SDSS J204940.86+165003.6, SDSSJ204940.85+165003.6
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 20 49 40.86 (0.1) | 20 49 40.85 | 20 49 40.86 (0.1) | ||
| Declination | 16 50 03.56 (0.06) | 16 50 03.60 | 16 50 03.62 (0.06) | ||
| Spectral type | He-sdO | sdOHe | |||
| Effective temperature | [K] | 43000.0 (700) | |||
| log(g) | [cgs] | 5.71 (0.1) | |||
| Mass | [M☉] | ||||
| log(Luminosity) | [L☉] | ||||
| Cooling age | [Gyr] | ||||
| log(H/He) | |||||
| log(C/He) | |||||
| log(Ca/He) | |||||
| log(Ca/H) | |||||
| Parallax | [mas] | 0.33 (0.1) | 0.32 (0.2) | 0.33 (0.1) | |
| Distance | [pc] | 3045.07 (1303) | 3078.82 (1807) | 3045.07 (1303) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | -4.394 (0.1) | -4.13 (0.3) | -4.394 (0.1) | |
| Proper motion (declination) | [mas/yr] | -3.9 (0.09) | -3.762 (0.2) | -3.9 (0.1) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 16.80 | ||||
| V magnitude | |||||
| R magnitude | 17.70 | ||||
| I magnitude | |||||
| J magnitude | |||||
| H magnitude | |||||
| K magnitude | |||||
| u magnitude | 17.31 (0.009) | 17.31 (0.009) | |||
| g magnitude | 17.67 (0.005) | 17.67 (0.005) | |||
| r magnitude | 18.12 (0.007) | 18.12 (0.006) | |||
| i magnitude | 18.47 (0.01) | 18.46 (0.01) | |||
| z magnitude | 18.75 (0.04) | 18.75 (0.04) | |||
| G magnitude | 17.90 (0.003) | 17.93 (0.001) | 17.90 (0.003) | ||
| BP magnitude | 17.79 (0.008) | 17.72 (0.009) | |||
| RP magnitude | 18.17 (0.01) | 18.15 (0.01) | |||
| Pan g magnitude | 17.75 (0.004) | ||||
| Pan r magnitude | 18.14 (0.002) | ||||
| Pan i magnitude | 18.50 (0.006) | ||||
| Pan z magnitude | 18.78 (0.009) | ||||
| Pan y magnitude | 18.93 (0.03) | ||||
| E(B-V) | 0.068 | ||||
* 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.