All names: SDSS J220123.19+021936.7, Gaia DR2 2683345934175922176, SDSS J220123.19+021936.6, Gaia EDR3 2683345934175922176, USNO-B1.0 0923-00748128, LSPM J2201+0219, J2201+0219, WDJ220123.21+021937.99, Gaia DR3 2683345934175922176, SDSS J220123.19+021936.70, SDSS J220123.18+021936.6
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR10 | Kilic et al. 2025 | Caron et al. 2023 | Coutu et al. 2019 | Gaia DR2 | Stilism | Kepler et al. 2015 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 22 01 23.17 (0.2) | 22 01 23.19 | 22 01 23.19 | 22 01 23.17 (0.3) | 22 01 23.17 | 22 01 23.21 (0.2) | 22 01 23.17 | |||||||
| Declination | 02 19 35.50 (0.3) | 02 19 36.66 | 02 19 36.66 | 02 19 35.58 (0.5) | 02 19 35.50 | 02 19 37.98 (0.3) | 02 19 35.58 | |||||||
| Spectral type | DZ | DZ | DZ | DZ | DZ | DZ | DZ | |||||||
| Effective temperature | [K] | 4580.0 (20) | 4580.0 (20) | 4599.0 (66) | 5551.0 (20) | 4822.0 (84) | ||||||||
| log(g) | [cgs] | 7.91 (0.02) | 7.92 (0.03) | 7.92 | 8.00 (0) | 8.11 (0.05) | ||||||||
| Mass | [M☉] | 0.515 (0.02) | 0.521 (0.03) | 0.5195 | 0.637 (0.05) | |||||||||
| log(Luminosity) | [L☉] | |||||||||||||
| Cooling age | [Gyr] | 6.1000 | 5.8300 | |||||||||||
| log(H/He) | -5.0 | <-30.0 | ||||||||||||
| log(C/He) | ||||||||||||||
| log(Ca/He) | -10.8 | -10.8 | -11.0022 (0.2) | -10.5 (0.04) | ||||||||||
| 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] | 15.61 (0.2) | 15.67 (0.4) | 15.67 | 15.67 (0.4) | 15.61 | 15.61 (0.2) | 15.67 (0.4) | ||||||
| Distance | [pc] | 64.08 (1) | 63.82 (2) | 63.82 (2) | 63.82 (2) | 64.08 | 64.08 (1) | 63.82 (2) | ||||||
| Composition | He | He | He | He | ||||||||||
| Proper motion (right ascension) | [mas/yr] | -39.83919321 (0.3) | -39.63331453 (0.7) | -39.839 (0.3) | -39.63331453 | |||||||||
| Proper motion (declination) | [mas/yr] | -155.1752598 (0.4) | -155.8024858 (0.9) | -155.175 (0.4) | -155.8024858 | |||||||||
| Variability | ||||||||||||||
| Magnetic | ||||||||||||||
| Bd | [MG] | |||||||||||||
| Infrared excess (disk) | ||||||||||||||
| Binarity | ||||||||||||||
| B magnitude | 19.90 | |||||||||||||
| V magnitude | ||||||||||||||
| R magnitude | 17.40 | |||||||||||||
| I magnitude | ||||||||||||||
| J magnitude | ||||||||||||||
| H magnitude | ||||||||||||||
| K magnitude | ||||||||||||||
| u magnitude | 22.39 (0.3) | 22.34 (0.3) | 22.29 (0.3) | 22.39 (0.3) | 22.39 (0.3) | |||||||||
| g magnitude | 19.78 (0.01) | 19.77 (0.02) | 19.78 (0.01) | 19.78 (0.01) | ||||||||||
| r magnitude | 19.06 (0.01) | 19.05 (0.02) | 19.06 (0.01) | 19.06 (0.01) | ||||||||||
| i magnitude | 18.83 (0.01) | 18.82 (0.02) | 18.83 (0.01) | 18.83 (0.01) | ||||||||||
| z magnitude | 18.73 (0.04) | 18.73 (0.04) | 18.73 (0.04) | 18.73 (0.04) | ||||||||||
| G magnitude | 19.12 (0.06) | 19.14 | 19.12 | 19.12 (0.004) | 19.14 | |||||||||
| BP magnitude | 19.67 (0.06) | 19.54 | 19.54 | |||||||||||
| RP magnitude | 18.49 (0.04) | 18.56 | 18.56 | |||||||||||
| Pan g magnitude | 19.66 (0.01) | 19.66 (0.01) | ||||||||||||
| Pan r magnitude | 19.07 (0.004) | 19.07 (0.004) | ||||||||||||
| Pan i magnitude | 18.85 (0.003) | 18.85 (0.004) | ||||||||||||
| Pan z magnitude | 18.79 (0.006) | 18.79 (0.007) | ||||||||||||
| Pan y magnitude | 18.80 (0.02) | 18.80 (0.02) | ||||||||||||
| E(B-V) | 0.002 | |||||||||||||
* 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.