All names: Gaia EDR3 1328542717345369856, [HHD2009] SDSS J1642+3822, Gaia DR3 1328542717345369856, SDSS J164205.84+382218.1, WD 1640+384, SDSS J164205.83+382218.2, Gaia DR2 1328542717345369856, WISE J164205.82+382218.1, SDSS J164205.84+382218.2, WIRED J164205.84+382218.1, GALEX J164205.9+382218
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Bedard et al. 2020 | Gaia DR2 | Stilism | sdss-wdms.org (29/04/2016) | Tremblay et al. 2011 | Simbad | Eisenstein et al. 2006 | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 42 05.84 (0.1) | 16 42 05.85 | 16 42 05.84 (0.2) | 16 42 05.84 | 16 42 05.85 (0.1) | 16 42 05.84 | 16 42 05.88 | 16 42 05.84 | ||||||
| Declination | 38 22 18.30 (0.2) | 38 22 18.17 | 38 22 18.30 (0.2) | 38 22 18.08 | 38 22 18.16 (0.2) | 38 22 18.17 | 38 22 16.32 | 38 22 18.15 | ||||||
| Spectral type | DA+M | DA+M | DA | DA+dMe | DA+M | DA dM | DA+M | DA+MS | ||||||
| Effective temperature | [K] | 41980.0 (1078) | 43969.0 (2304) | 44200.0 (2010) | 42930.0 (1426) | 41516.0 (1129) | ||||||||
| log(g) | [cgs] | 7.66 (0.1) | 7.60 (0.2) | 7.58 (0.2) | 7.56 (0.1) | 7.44 (0.1) | ||||||||
| Mass | [M☉] | 0.52 (0.04) | 0.51 (0.09) | 0.5 (0.07) | ||||||||||
| log(Luminosity) | [L☉] | -0.06 (0.09) | ||||||||||||
| Cooling age | [Gyr] | 0.0028 (0.0007) | 0.0032 | |||||||||||
| 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] | 1.47 (0.2) | 1.11 (0.2) | 1.47 (0.2) | ||||||||||
| Distance | [pc] | 681.92 (78) | 897.85 (157) | 681.94 (78) | ||||||||||
| Composition | H | H | ||||||||||||
| Proper motion (right ascension) | [mas/yr] | -11.92970348 (0.2) | -11.93757685 (0.4) | -11.93 (0.2) | -17.2 | |||||||||
| Proper motion (declination) | [mas/yr] | 9.279695633 (0.2) | 9.998582309 (0.5) | 9.28 (0.2) | 6.1 | |||||||||
| Variability | ||||||||||||||
| Magnetic | ||||||||||||||
| Bd | [MG] | |||||||||||||
| Infrared excess (disk) | ||||||||||||||
| Binarity | WDMS | WDMS | WDMS | WDMS | ||||||||||
| B magnitude | ||||||||||||||
| V magnitude | ||||||||||||||
| R magnitude | ||||||||||||||
| I magnitude | ||||||||||||||
| J magnitude | ||||||||||||||
| H magnitude | ||||||||||||||
| K magnitude | ||||||||||||||
| u magnitude | 18.28 (0.01) | 18.31 | 18.28 (0.01) | 18.31 (0.03) | 18.31 | 18.31 (0.02) | ||||||||
| g magnitude | 18.58 (0.008) | 18.62 | 18.58 (0.008) | 18.62 (0.02) | 18.62 | 18.60 (0.02) | ||||||||
| r magnitude | 18.99 (0.01) | 19.07 | 18.99 (0.01) | 19.07 (0.02) | 19.07 | 19.06 (0.02) | ||||||||
| i magnitude | 18.95 (0.01) | 19.10 | 18.95 (0.01) | 19.10 (0.02) | 19.10 | 19.07 (0.02) | ||||||||
| z magnitude | 18.83 (0.05) | 18.94 | 18.83 (0.05) | 18.94 (0.05) | 18.94 | 18.91 (0.05) | ||||||||
| G magnitude | 18.91 (0.03) | 18.93 | 18.91 (0.004) | |||||||||||
| BP magnitude | 18.78 (0.03) | 18.71 | ||||||||||||
| RP magnitude | 18.59 (0.03) | 18.60 | ||||||||||||
| Pan g magnitude | 18.70 (0.006) | |||||||||||||
| Pan r magnitude | 19.09 (0.009) | |||||||||||||
| Pan i magnitude | 19.08 (0.01) | |||||||||||||
| Pan z magnitude | 18.92 (0.02) | |||||||||||||
| Pan y magnitude | 18.74 (0.03) | |||||||||||||
| E(B-V) | 0.020 | |||||||||||||
* 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.