All names: Gaia DR3 1778839767397091200, Gaia DR2 1778839767397091200, Gaia EDR3 1778839767397091200, GALEX J221850.2+212305, WDJ221850.28+212305.19, SDSS J221850.26+212304.7, SDSS J221850.23+212303.73, J2218+2123, SDSS J221850.26+212304.6, SDSS J221850.23+212303.7
| 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 18 50.23 (0.1) | 22 18 50.26 | 22 18 50.28 | 22 18 50.23 (0.1) | 22 18 50.23 | 22 18 50.28 (0.1) | 22 18 50.23 | |||||||
| Declination | 21 23 03.41 (0.1) | 21 23 04.66 | 21 23 05.19 | 21 23 03.46 (0.1) | 21 23 03.41 | 21 23 05.19 (0.1) | 21 23 03.46 | |||||||
| Spectral type | DQ | DQ | DQ | DQ | DQ | DQ | DQ | |||||||
| Effective temperature | [K] | 7939.0 (46) | 8075.0 (42) | 8120.0 (188) | 8094.0 (21) | 8087.0 (158) | ||||||||
| log(g) | [cgs] | 7.90 (0.02) | 7.94 (0.02) | 7.95 | 8.00 (0) | 7.94 (0.04) | ||||||||
| Mass | [M☉] | 0.517 (0.01) | 0.543 (0.02) | 0.547 | 0.544 (0.03) | |||||||||
| log(Luminosity) | [L☉] | |||||||||||||
| Cooling age | [Gyr] | 1.0500 | 1.0000 | |||||||||||
| log(H/He) | ||||||||||||||
| log(C/He) | -5.48 | -5.37 | -5.2878 (0.04) | -5.218 (0.03) | ||||||||||
| 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] | 10.30 (0.1) | 10.36 (0.2) | 10.36 | 10.36 (0.2) | 10.30 | 10.30 (0.1) | 10.36 (0.2) | ||||||
| Distance | [pc] | 97.05 (1) | 96.53 (1) | 96.49 (1) | 96.49 (1) | 97.05 | 97.05 (1) | 96.49 (1) | ||||||
| Composition | He | He | He | He | ||||||||||
| Proper motion (right ascension) | [mas/yr] | -44.02193785 (0.1) | -44.10607227 (0.2) | -44.022 (0.1) | -44.10607227 | |||||||||
| Proper motion (declination) | [mas/yr] | -111.5318559 (0.1) | -111.5685261 (0.2) | -111.532 (0.1) | -111.5685261 | |||||||||
| Variability | ||||||||||||||
| Magnetic | ||||||||||||||
| Bd | [MG] | |||||||||||||
| Infrared excess (disk) | ||||||||||||||
| Binarity | ||||||||||||||
| B magnitude | ||||||||||||||
| V magnitude | ||||||||||||||
| R magnitude | ||||||||||||||
| I magnitude | ||||||||||||||
| J magnitude | 17.70 (0.04) | |||||||||||||
| H magnitude | ||||||||||||||
| K magnitude | ||||||||||||||
| u magnitude | 18.16 (0.01) | 18.17 (0.01) | 18.16 (0.02) | 18.16 (0.01) | 18.16 (0.01) | |||||||||
| g magnitude | 17.92 (0.006) | 17.93 (0.01) | 17.92 (0.006) | 17.92 (0.006) | ||||||||||
| r magnitude | 17.92 (0.007) | 17.93 (0.01) | 17.92 (0.007) | 17.92 (0.007) | ||||||||||
| i magnitude | 17.98 (0.008) | 18.00 (0.01) | 17.98 (0.008) | 17.98 (0.008) | ||||||||||
| z magnitude | 18.14 (0.02) | 18.14 (0.02) | 18.14 (0.02) | 18.14 (0.02) | ||||||||||
| G magnitude | 17.88 (0.01) | 17.90 | 17.88 | 17.88 (0.003) | 17.90 | |||||||||
| BP magnitude | 17.99 (0.01) | 18.00 | 18.00 | |||||||||||
| RP magnitude | 17.72 (0.01) | 17.72 | 17.72 | |||||||||||
| Pan g magnitude | 17.95 (0.005) | 17.95 (0.005) | ||||||||||||
| Pan r magnitude | 17.95 (0.004) | 17.95 (0.004) | ||||||||||||
| Pan i magnitude | 18.04 (0.004) | 18.04 (0.003) | ||||||||||||
| Pan z magnitude | 18.14 (0.01) | 18.14 (0.01) | ||||||||||||
| Pan y magnitude | 18.24 (0.02) | 18.24 (0.01) | ||||||||||||
| E(B-V) | 0.015 | |||||||||||||
* 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.