All names: [HHD2009] SDSS J2121-0556, SDSS J212131.54-055618.0, Gaia DR3 6899283422452783360, SDSS J212131.55-055618.0, SDSS J212131.55-055618.1, Gaia DR2 6899283422452783360, WD 2118-061, Gaia EDR3 6899283422452783360, GALEX J212131.5-055618, LAMOST J212131.55-055618.0
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Gaia DR2 | Stilism | sdss-wdms.org (29/04/2016) | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 21 21 31.55 (0.5) | 21 21 31.55 | 21 21 31.55 (0.9) | 21 21 31.55 | 21 21 31.55 (0.5) | 21 21 31.55 | 21 21 30.31 | 21 21 31.55 | |||
| Declination | -05 56 18.16 (0.4) | -05 56 18.07 | -05 56 18.16 (0.7) | -05 56 17.99 | -05 56 18.05 (0.4) | -05 56 18.02 | -05 56 11.76 | -05 56 18.05 | |||
| Spectral type | DA+M | DA+M | DA+M | DA+M | DA+M | ||||||
| Effective temperature | [K] | 28064.0 (2328) | 8700.0 (137) | 8669.0 (191) | |||||||
| log(g) | [cgs] | 7.97 (0.4) | 8.93 (0.08) | 9.02 (0.2) | |||||||
| Mass | [M☉] | 0.63 (0.2) | |||||||||
| log(Luminosity) | [L☉] | ||||||||||
| Cooling age | [Gyr] | ||||||||||
| log(H/He) | |||||||||||
| log(C/He) | |||||||||||
| log(Ca/He) | |||||||||||
| log(Ca/H) | |||||||||||
| Parallax | [mas] | 0.39 (0.6) | -2.14 (1) | 0.39 (0.6) | |||||||
| Distance | [pc] | 2547.44 (4052) | 218.00 (9) | 2547.12 (4051) | |||||||
| Composition | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -5.220754968 (0.6) | -3.781695884 (2) | -5.221 (0.6) | 0.7 | ||||||
| Proper motion (declination) | [mas/yr] | -6.887466057 (0.5) | -6.273097775 (1) | -6.887 (0.5) | -10.4 | ||||||
| Variability | |||||||||||
| Magnetic | |||||||||||
| Bd | [MG] | ||||||||||
| Infrared excess (disk) | |||||||||||
| Binarity | WDMS | WDMS | yes | WDMS | |||||||
| B magnitude | |||||||||||
| V magnitude | |||||||||||
| R magnitude | |||||||||||
| I magnitude | |||||||||||
| J magnitude | |||||||||||
| H magnitude | |||||||||||
| K magnitude | |||||||||||
| u magnitude | 19.76 (0.04) | 19.84 | 19.76 (0.04) | 19.84 (0.04) | 19.82 | 19.83 (0.04) | |||||
| g magnitude | 19.77 (0.02) | 19.78 | 19.77 (0.02) | 19.79 (0.02) | 19.78 | 19.78 (0.02) | |||||
| r magnitude | 19.80 (0.02) | 19.87 | 19.80 (0.02) | 19.87 (0.03) | 19.87 | 19.87 (0.03) | |||||
| i magnitude | 19.41 (0.02) | 19.43 | 19.41 (0.02) | 19.43 (0.02) | 19.43 | 19.43 (0.02) | |||||
| z magnitude | 18.94 (0.05) | 18.95 | 18.94 (0.05) | 18.95 (0.05) | 18.93 | 18.93 (0.05) | |||||
| G magnitude | 19.68 (0.05) | 19.64 | 19.68 (0.008) | ||||||||
| BP magnitude | 19.87 (0.05) | 19.82 | |||||||||
| RP magnitude | 19.05 (0.05) | 19.00 | |||||||||
| Pan g magnitude | 19.79 (0.009) | ||||||||||
| Pan r magnitude | 19.85 (0.02) | ||||||||||
| Pan i magnitude | 19.41 (0.009) | ||||||||||
| Pan z magnitude | 19.00 (0.01) | ||||||||||
| Pan y magnitude | 18.84 (0.03) | ||||||||||
| E(B-V) | 0.035 | ||||||||||
* 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.