All names: GALEX J202818.6+762232, SDSS J202818.28+762232.9, SDSS J202818.28+762232.91, Gaia DR3 2290240458179334016, SDSS J202818.28+762232.7, Gaia EDR3 2290240458179334016, Gaia DR2 2290240458179334016
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR10 | Bedard et al. 2020 | Gaia DR2 | Stilism | Kepler et al. 2015 | Simbad |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 20 28 18.25 (0.1) | 20 28 18.28 | 20 28 18.25 (0.1) | 20 28 18.28 (0.1) | |||||
| Declination | 76 22 32.74 (0.1) | 76 22 32.79 | 76 22 32.74 (0.2) | 76 22 32.84 (0.1) | |||||
| Spectral type | DO | DO/sdO | DC | ||||||
| Effective temperature | [K] | 120634.0 (6347) | 49369.0 (5000) | ||||||
| log(g) | [cgs] | 7.90 (0.7) | 7.44 (0.05) | ||||||
| Mass | [M☉] | 0.72 (0.2) | |||||||
| log(Luminosity) | [L☉] | 1.68 (0.5) | |||||||
| Cooling age | [Gyr] | 0.0001 (0.0001) | |||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| log(N/He) | |||||||||
| log(O/He) | |||||||||
| log(Na/He) | |||||||||
| log(Mg/He) | |||||||||
| log(Al/He) | |||||||||
| log(Si/He) | |||||||||
| log(P/He) | |||||||||
| log(S/He) | |||||||||
| log(Cl/He) | |||||||||
| log(Sc/He) | |||||||||
| log(Ti/He) | |||||||||
| log(V/He) | |||||||||
| log(Cr/He) | |||||||||
| log(Mn/He) | |||||||||
| log(Fe/He) | |||||||||
| log(Co/He) | |||||||||
| log(Ni/He) | |||||||||
| log(Cu/He) | |||||||||
| log(Zn/He) | |||||||||
| log(Ga/He) | |||||||||
| log(Ge/He) | |||||||||
| log(Sr/He) | |||||||||
| Parallax | [mas] | 0.62 (0.1) | 0.68 (0.2) | 0.62 (0.1) | |||||
| Distance | [pc] | 1609.93 (284) | 1469.22 (368) | 1610.05 (284) | |||||
| Composition | He | ||||||||
| Proper motion (right ascension) | [mas/yr] | -6.344589502 (0.1) | -6.052994119 (0.2) | -6.345 (0.1) | |||||
| Proper motion (declination) | [mas/yr] | -6.090215135 (0.1) | -6.118905808 (0.3) | -6.09 (0.1) | |||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | |||||||||
| V magnitude | |||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 18.15 (0.02) | 18.15 (0.02) | 18.15 (0.01) | ||||||
| g magnitude | 18.30 (0.007) | 18.30 (0.01) | 18.30 (0.007) | ||||||
| r magnitude | 18.51 (0.01) | 18.51 (0.01) | 18.51 (0.01) | ||||||
| i magnitude | 18.76 (0.01) | 18.76 (0.01) | 18.75 (0.01) | ||||||
| z magnitude | 18.89 (0.05) | 18.89 (0.05) | 18.89 (0.05) | ||||||
| G magnitude | 18.41 (0.02) | 18.45 | 18.41 (0.003) | ||||||
| BP magnitude | 18.34 (0.02) | 18.33 | |||||||
| RP magnitude | 18.52 (0.03) | 18.48 | |||||||
| Pan g magnitude | 18.40 (0.007) | ||||||||
| Pan r magnitude | 18.56 (0.008) | ||||||||
| Pan i magnitude | 18.79 (0.005) | ||||||||
| Pan z magnitude | 18.96 (0.009) | ||||||||
| Pan y magnitude | 19.12 (0.05) | ||||||||
| E(B-V) | 0.195 | ||||||||
* 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.