All names: UCAC4 179-218859, TIC 370203952, Gaia DR2 6470234541977510400, Gaia DR3 6470234541977510400, 2MASS J20555333-5413085, Gaia EDR3 6470231685824803712, EC20522-5424, GALEX J205553.3-541307, EC 20522-5424
| Parameter | Unit | Gaia EDR3 | Geier 2020 | Stilism | Simbad |
|---|---|---|---|---|---|
| Right ascension | 20 55 56.64 (0.5) | 20 55 53.37 | 20 55 53.33 (0.03) | ||
| Declination | -54 13 14.60 (0.5) | -54 13 08.76 | -54 13 08.95 (0.03) | ||
| Spectral type | He-sdO | sdOHe | |||
| 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] | 1.42 (0.8) | 0.19 (0.06) | 0.16 (0.04) | |
| Distance | [pc] | 705.22 (375) | 5387.93 (1640) | 6439.15 (1845) | |
| Composition | |||||
| Proper motion (right ascension) | [mas/yr] | -3.886 (0.7) | 5.527 (0.08) | 5.705 (0.04) | |
| Proper motion (declination) | [mas/yr] | -6.181 (0.6) | -8.712 (0.08) | -8.696 (0.04) | |
| Variability | |||||
| Magnetic | |||||
| Bd | [MG] | ||||
| Infrared excess (disk) | |||||
| Binarity | |||||
| B magnitude | 15.35 | ||||
| V magnitude | 15.67 | ||||
| R magnitude | 16.06 (0.1) | ||||
| I magnitude | |||||
| J magnitude | 16.39 (0.1) | 16.39 (0.1) | |||
| H magnitude | 15.99 (0.2) | 15.99 (0.2) | |||
| K magnitude | 16.22 | ||||
| u magnitude | |||||
| g magnitude | |||||
| r magnitude | |||||
| i magnitude | |||||
| z magnitude | |||||
| G magnitude | 20.64 (0.007) | 15.61 (0.0006) | 15.60 (0.003) | ||
| BP magnitude | 20.77 (0.08) | 15.35 (0.009) | |||
| RP magnitude | 20.10 (0.08) | 15.92 (0.003) | |||
| Pan g magnitude | |||||
| Pan r magnitude | |||||
| Pan i magnitude | |||||
| Pan z magnitude | |||||
| Pan y magnitude | |||||
| E(B-V) | 0.022 | ||||
* 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.