All names: Gaia DR2 809117348318721664, LAMOST J102120.45+444636.9, SDSSJ102120.44+444636.9, Gaia DR3 809117348318721664, SDSS J102120.44+444637.0, GALEX J102120.4+444636, SDSS J102120.44+444636.9, SDSS J102120.44+444636.95, Gaia EDR3 809117348318721664
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | SDSS DR10 | Geier 2020 | Gaia DR2 | Stilism | Kepler et al. 2015 | Simbad | Eisenstein et al. 2006 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 10 21 20.44 (0.07) | 10 21 20.45 | 10 21 20.45 | 10 21 20.44 | 10 21 20.44 (0.1) | 10 21 20.44 (0.07) | 10 21 20.45 | ||||
| Declination | 44 46 36.86 (0.09) | 44 46 36.99 | 44 46 36.99 | 44 46 36.90 | 44 46 36.87 (0.2) | 44 46 37.00 (0.09) | 44 46 36.93 | ||||
| Spectral type | He-sdO | He-sdO | sdOHe | SDO | |||||||
| Effective temperature | [K] | 48250.0 (3920) | 50000.0 (50) | 100000.0 (2579) | |||||||
| log(g) | [cgs] | 5.75 (0.6) | 7.00 (0.01) | 5.66 (0.1) | |||||||
| Mass | [M☉] | ||||||||||
| log(Luminosity) | [L☉] | ||||||||||
| Cooling age | [Gyr] | ||||||||||
| log(H/He) | |||||||||||
| log(C/He) | |||||||||||
| log(Ca/He) | |||||||||||
| log(Ca/H) | |||||||||||
| Parallax | [mas] | 0.01 (0.1) | 0.22 (0.2) | 0.22 (0.2) | 0.01 (0.1) | ||||||
| Distance | [pc] | 90607.43 (897966) | 4564.13 (4068) | 4564.23 (4069) | 90909.09 (904132) | ||||||
| Composition | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -0.669368032 (0.08) | -0.364 (0.2) | -0.364130982 (0.2) | -0.669 (0.09) | 1.8 | |||||
| Proper motion (declination) | [mas/yr] | -8.477376851 (0.1) | -8.91 (0.3) | -8.910373647 (0.3) | -8.477 (0.1) | -9.6 | |||||
| Variability | |||||||||||
| Magnetic | |||||||||||
| Bd | [MG] | ||||||||||
| Infrared excess (disk) | |||||||||||
| Binarity | |||||||||||
| B magnitude | |||||||||||
| V magnitude | 18.24 | ||||||||||
| R magnitude | |||||||||||
| I magnitude | |||||||||||
| J magnitude | |||||||||||
| H magnitude | |||||||||||
| K magnitude | |||||||||||
| u magnitude | 17.30 (0.009) | 17.30 (0.009) | 17.30 (0.009) | 17.32 (0.01) | 17.30 (0.009) | 17.31 (0.02) | |||||
| g magnitude | 17.71 (0.005) | 17.71 (0.005) | 17.71 (0.005) | 17.73 (0.02) | 17.71 (0.005) | 17.73 (0.05) | |||||
| r magnitude | 18.26 (0.008) | 18.26 (0.008) | 18.27 (0.008) | 18.27 (0.02) | 18.27 (0.008) | 18.24 (0.04) | |||||
| i magnitude | 18.63 (0.01) | 18.63 (0.01) | 18.63 (0.01) | 18.65 (0.03) | 18.63 (0.01) | 18.58 (0.05) | |||||
| z magnitude | 18.95 (0.04) | 18.95 (0.04) | 18.95 (0.04) | 18.94 (0.04) | 18.95 (0.04) | 19.05 (0.05) | |||||
| G magnitude | 18.00 (0.008) | 18.04 (0.003) | 18.04 | 18.00 (0.003) | |||||||
| BP magnitude | 17.82 (0.008) | 17.70 (0.02) | 17.70 | ||||||||
| RP magnitude | 18.33 (0.02) | 18.30 (0.02) | 18.30 | ||||||||
| Pan g magnitude | 17.83 (0.005) | 17.83 (0.005) | |||||||||
| Pan r magnitude | 18.25 (0.006) | 18.25 (0.006) | |||||||||
| Pan i magnitude | 18.64 (0.003) | 18.64 (0.003) | |||||||||
| Pan z magnitude | 18.97 (0.01) | 18.97 (0.01) | |||||||||
| Pan y magnitude | 19.09 (0.1) | 19.09 (0.1) | |||||||||
| E(B-V) | 0.018 | ||||||||||
* 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.