All names: J1220+4414, Gaia DR2 1538625407627245056, Gaia DR3 1538625407627245056, WD 1217+445, WDJ122018.08+441424.76, SDSS J122018.03+441424.2, WISE J122017.93+441423.3, USNO-B1.0 1342-00244971, LP 171-7, GALEX J122018.0+441423, WIRED J122018.03+441424.2, Gaia EDR3 1538625407627245056, WISEA J122017.88+441423.2, NLTT 30395, SDSS J122018.03+441424.3, LSPM J1220+4414W
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Kilic et al. 2025 | Caron et al. 2023 | Kilic et al. 2020 | MWDD H | Gaia DR2 | Stilism | Tremblay et al. 2011 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 12 20 17.84 (0.07) | 12 20 18.03 | 12 20 17.85 (0.09) | 12 20 17.84 | 12 20 18.08 (0.07) | 12 20 17.85 | 12 20 18.03 | 12 20 17.33 | 12 20 18.03 | |||||||||
| Declination | 44 14 22.31 (0.06) | 44 14 24.30 | 44 14 22.39 (0.07) | 44 14 22.31 | 44 14 24.76 (0.06) | 44 14 22.39 | 44 14 24.30 | 44 14 21.48 | 44 14 24.29 | |||||||||
| Spectral type | DA | DA | DA | DA | DA | DA | DA | DA | DA_auto | DA | DA | DA | ||||||
| Effective temperature | [K] | 7092.0 (28) | 7072.0 (25) | 7092.0 (28) | 7011.0 | 7190.0 (80) | 7123.0 (80) | 7660.0 (35) | 7029.0 (44) | |||||||||
| log(g) | [cgs] | 8.44 (0.008) | 8.44 (0.008) | 8.45 (0.008) | 8.43 | 8.61 (0.1) | 8.44 (0.02) | 8.99 (0.01) | 8.27 (0.07) | |||||||||
| Mass | [M☉] | 0.878 (0.007) | 0.877 (0.007) | 0.88 (0.007) | 0.867 | 0.98 (0.08) | 0.878 (0.02) | 0.755 (0.04) | ||||||||||
| log(Luminosity) | [L☉] | |||||||||||||||||
| Cooling age | [Gyr] | 3.7300 | 3.5120 | 3.9811 | ||||||||||||||
| log(H/He) | ||||||||||||||||||
| log(C/He) | ||||||||||||||||||
| log(Ca/He) | ||||||||||||||||||
| log(Ca/H) | ||||||||||||||||||
| log(C/H) | ||||||||||||||||||
| log(N/H) | ||||||||||||||||||
| log(O/H) | ||||||||||||||||||
| log(Na/H) | ||||||||||||||||||
| log(Mg/H) | ||||||||||||||||||
| log(Al/H) | ||||||||||||||||||
| log(Si/H) | ||||||||||||||||||
| log(P/H) | ||||||||||||||||||
| log(S/H) | ||||||||||||||||||
| log(Sc/H) | ||||||||||||||||||
| log(Ti/H) | ||||||||||||||||||
| log(Cr/H) | ||||||||||||||||||
| log(Mn/H) | ||||||||||||||||||
| log(Fe/H) | ||||||||||||||||||
| log(Ni/H) | ||||||||||||||||||
| Parallax | [mas] | 20.68 (0.09) | 20.74 (0.1) | 20.74 (0.1) | 20.68 | 20.68 (0.09) | 20.74 (0.1) | |||||||||||
| Distance | [pc] | 48.37 (0.2) | 48.22 (0.3) | 48.22 (0.3) | 48.37 | 48.37 (0.2) | 48.22 (0.3) | |||||||||||
| Composition | H | H | H | H | ||||||||||||||
| Proper motion (right ascension) | [mas/yr] | -164.9205679 (0.08) | -164.8031926 (0.1) | -164.921 (0.08) | -164.803 | -159.0 | ||||||||||||
| Proper motion (declination) | [mas/yr] | -152.8904847 (0.09) | -152.9965921 (0.1) | -152.89 (0.09) | -152.997 | -158.9 | ||||||||||||
| Variability | ||||||||||||||||||
| Magnetic | ||||||||||||||||||
| Bd | [MG] | |||||||||||||||||
| Infrared excess (disk) | ||||||||||||||||||
| Binarity | ||||||||||||||||||
| B magnitude | 17.50 | |||||||||||||||||
| V magnitude | ||||||||||||||||||
| R magnitude | 17.40 | |||||||||||||||||
| I magnitude | ||||||||||||||||||
| J magnitude | 16.82 (0.02) | |||||||||||||||||
| H magnitude | ||||||||||||||||||
| K magnitude | ||||||||||||||||||
| u magnitude | 18.19 (0.01) | 18.20 (0.01) | 18.19 (0.01) | 18.19 (0.01) | 18.19 (0.03) | 18.18 | 18.20 (0.03) | |||||||||||
| g magnitude | 17.68 (0.005) | 17.68 (0.005) | 17.68 (0.005) | 17.71 (0.02) | 17.70 | 17.72 (0.02) | ||||||||||||
| r magnitude | 17.50 (0.006) | 17.50 (0.006) | 17.50 (0.006) | 17.48 (0.02) | 17.47 | 17.48 (0.02) | ||||||||||||
| i magnitude | 17.46 (0.006) | 17.46 (0.006) | 17.46 (0.006) | 17.41 (0.02) | 17.40 | 17.42 (0.02) | ||||||||||||
| z magnitude | 17.51 (0.01) | 17.51 (0.01) | 17.51 (0.01) | 17.50 (0.02) | 17.50 | 17.52 (0.02) | ||||||||||||
| G magnitude | 17.47 (0.008) | 17.49 | 17.47 | 17.47 (0.003) | 17.49 | |||||||||||||
| BP magnitude | 17.66 (0.008) | 17.66 | 17.66 | |||||||||||||||
| RP magnitude | 17.14 (0.01) | 17.14 | 17.14 | |||||||||||||||
| Pan g magnitude | 17.67 (0.003) | 17.67 (0.003) | ||||||||||||||||
| Pan r magnitude | 17.50 (0.005) | 17.50 (0.005) | ||||||||||||||||
| Pan i magnitude | 17.47 (0.004) | 17.47 (0.004) | ||||||||||||||||
| Pan z magnitude | 17.52 (0.003) | 17.52 (0.003) | ||||||||||||||||
| Pan y magnitude | 17.56 (0.008) | 17.56 (0.01) | ||||||||||||||||
| 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.