All names: SDSS J082110.89+183924.1, Gaia DR2 663184216548543488, SDSSJ082110.89+183924.2, SDSS J082110.89+183924.16, GALEX J082110.8+183925, Gaia DR3 663184216548543488, Gaia EDR3 663184216548543488, SDSS J082110.89+183924.2
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR10 | Geier 2020 | Gaia DR2 | Stilism | Kepler et al. 2015 | Simbad |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 21 10.89 (0.1) | 08 21 10.89 | 08 21 10.89 | 08 21 10.89 (0.2) | 08 21 10.90 (0.1) | ||||
| Declination | 18 39 24.18 (0.09) | 18 39 24.20 | 18 39 24.20 | 18 39 24.18 (0.1) | 18 39 24.24 (0.09) | ||||
| Spectral type | sdOB | sdO | sdO | ||||||
| Effective temperature | [K] | 35057.0 (1013) | 34193.0 (394) | ||||||
| log(g) | [cgs] | 5.75 (0.2) | 5.42 (0.08) | ||||||
| Mass | [M☉] | ||||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | ||||||||
| log(H/He) | |||||||||
| log(C/He) | |||||||||
| log(Ca/He) | |||||||||
| log(Ca/H) | |||||||||
| Parallax | [mas] | 0.26 (0.2) | 0.03 (0.2) | 0.03 (0.2) | 0.26 (0.2) | ||||
| Distance | [pc] | 3800.56 (2667) | 38167.94 (339724) | 38213.53 (340578) | 3800.84 (2668) | ||||
| Composition | |||||||||
| Proper motion (right ascension) | [mas/yr] | -1.69746405 (0.2) | -2.268 (0.3) | -2.267500502 (0.3) | -1.697 (0.2) | ||||
| Proper motion (declination) | [mas/yr] | -3.48175554 (0.1) | -3.093 (0.2) | -3.092511223 (0.2) | -3.482 (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 | 17.53 (0.009) | 17.53 (0.009) | 17.53 (0.02) | 17.53 (0.009) | |||||
| g magnitude | 17.82 (0.005) | 17.82 (0.005) | 17.85 (0.02) | 17.82 (0.005) | |||||
| r magnitude | 18.31 (0.008) | 18.31 (0.008) | 18.32 (0.01) | 18.31 (0.008) | |||||
| i magnitude | 18.66 (0.01) | 18.66 (0.01) | 18.67 (0.03) | 18.67 (0.01) | |||||
| z magnitude | 18.98 (0.04) | 18.98 (0.04) | 18.98 (0.04) | 18.91 (0.04) | |||||
| G magnitude | 18.08 (0.01) | 18.12 (0.003) | 18.12 | 18.08 (0.003) | |||||
| BP magnitude | 17.92 (0.01) | 17.85 (0.01) | 17.85 | ||||||
| RP magnitude | 18.36 (0.03) | 18.25 (0.03) | 18.25 | ||||||
| Pan g magnitude | 17.90 (0.005) | 17.90 (0.005) | |||||||
| Pan r magnitude | 18.32 (0.004) | 18.32 (0.004) | |||||||
| Pan i magnitude | 18.69 (0.007) | 18.69 (0.007) | |||||||
| Pan z magnitude | 18.98 (0.01) | 18.98 (0.01) | |||||||
| Pan y magnitude | 19.08 (0.02) | 19.08 (0.02) | |||||||
| E(B-V) | 0.034 | ||||||||
* 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.