All names: SDSS J084405.94+094122.3, [HHD2009] SDSS J0844+0941, Gaia DR3 598094816106822016, SDSS J084405.94+094122.4, 2MASS J08440593+0941221, Gaia DR2 598094816106822016, Gaia EDR3 598094816106822016, WD 0841+098, WIRED J084405.94+094122.3, TIC 443971263
| 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 | 08 44 05.91 (0.3) | 08 44 05.94 | 08 44 05.91 (0.3) | 08 44 05.94 | 08 44 05.95 (0.3) | 08 44 05.94 | 08 44 05.47 | 08 44 05.94 | |||
| Declination | 09 41 22.09 (0.1) | 09 41 22.30 | 09 41 22.11 (0.2) | 09 41 22.31 | 09 41 22.50 (0.1) | 09 41 22.39 | 09 41 18.60 | 09 41 22.39 | |||
| Spectral type | DA+M | DA+M | DA+M | DA d | DA+M | ||||||
| Effective temperature | [K] | 11565.0 (2375) | 7632.0 (136) | 7419.0 (152) | |||||||
| log(g) | [cgs] | 7.85 (0.5) | 6.23 (0.3) | 6.42 (0.4) | |||||||
| Mass | [M☉] | 0.52 (0.3) | |||||||||
| log(Luminosity) | [L☉] | ||||||||||
| Cooling age | [Gyr] | ||||||||||
| log(H/He) | |||||||||||
| log(C/He) | |||||||||||
| log(Ca/He) | |||||||||||
| log(Ca/H) | |||||||||||
| Parallax | [mas] | 2.20 (0.3) | 2.20 (0.5) | 2.20 (0.3) | |||||||
| Distance | [pc] | 454.54 (66) | 454.39 (94) | 616.00 (236) | 454.55 (66) | ||||||
| Composition | |||||||||||
| Proper motion (right ascension) | [mas/yr] | -35.63735788 (0.3) | -35.35283018 (0.6) | -35.637 (0.3) | -39.3 | ||||||
| Proper motion (declination) | [mas/yr] | -25.43644939 (0.2) | -24.93681228 (0.4) | -25.436 (0.2) | -33.4 | ||||||
| Variability | |||||||||||
| Magnetic | |||||||||||
| Bd | [MG] | ||||||||||
| Infrared excess (disk) | |||||||||||
| Binarity | WDMS | WDMS | WDMS | ||||||||
| B magnitude | |||||||||||
| V magnitude | |||||||||||
| R magnitude | |||||||||||
| I magnitude | |||||||||||
| J magnitude | 16.92 (0.01) | ||||||||||
| H magnitude | 16.47 (0.02) | ||||||||||
| K magnitude | 16.19 (0.03) | ||||||||||
| u magnitude | 19.71 (0.03) | 19.80 | 19.82 (0.04) | 19.80 (0.04) | 19.80 | 19.84 (0.03) | |||||
| g magnitude | 19.26 (0.01) | 19.29 | 19.29 (0.01) | 19.29 (0.02) | 19.29 | 19.30 (0.02) | |||||
| r magnitude | 19.25 (0.01) | 19.24 | 19.25 (0.01) | 19.24 (0.02) | 19.24 | 19.25 (0.02) | |||||
| i magnitude | 18.75 (0.01) | 18.75 | 18.75 (0.01) | 18.75 (0.02) | 18.75 | 18.75 (0.02) | |||||
| z magnitude | 18.20 (0.02) | 18.21 | 18.22 (0.02) | 18.21 (0.02) | 18.21 | 18.20 (0.02) | |||||
| G magnitude | 18.96 (0.02) | 18.98 | 18.96 (0.004) | ||||||||
| BP magnitude | 19.31 (0.02) | 19.28 | |||||||||
| RP magnitude | 18.31 (0.02) | 18.31 | |||||||||
| Pan g magnitude | 19.26 (0.006) | ||||||||||
| Pan r magnitude | 19.27 (0.007) | ||||||||||
| Pan i magnitude | 18.77 (0.01) | ||||||||||
| Pan z magnitude | 18.33 (0.01) | ||||||||||
| Pan y magnitude | 18.09 (0.01) | ||||||||||
| E(B-V) | 0.028 | ||||||||||
* 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.