All names: SDSS J084415.69+544632.1, Gaia DR2 1030783114428872704, J0844+5446, SDSS J084415.68+544632.4, SDSS J084415.68+544632.48, Gaia DR3 1030783114428872704, Gaia EDR3 1030783114428872704
| Parameter | Unit | Gaia EDR3 | SDSS DR10 | Coutu et al. 2019 | Gaia DR2 | Stilism | Kepler et al. 2015 | Simbad | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 08 44 15.71 (0.7) | 08 44 15.69 | 08 44 15.68 | 08 44 15.71 (0.9) | 08 44 15.70 (0.7) | ||||
| Declination | 54 46 31.87 (0.6) | 54 46 32.18 | 54 46 32.48 | 54 46 31.88 (0.8) | 54 46 32.27 (0.6) | ||||
| Spectral type | DZ | DZ | DZ | DZ | |||||
| Effective temperature | [K] | 7033.0 (412) | 11312.0 (255) | ||||||
| log(g) | [cgs] | 8.36 | 8.00 (0) | ||||||
| Mass | [M☉] | 0.8083 | |||||||
| log(Luminosity) | [L☉] | ||||||||
| Cooling age | [Gyr] | 3.1700 | |||||||
| log(H/He) | <-3.6173 | ||||||||
| log(C/He) | |||||||||
| log(Ca/He) | -9.7683 (0.2) | -7.737999999999999 (0.2) | |||||||
| 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] | 3.68 (0.9) | 4.61 | 4.61 (1) | 3.68 (0.9) | ||||
| Distance | [pc] | 271.93 (65) | 216.90 (55) | 216.90 (55) | 271.92 (65) | ||||
| Composition | He | He | |||||||
| Proper motion (right ascension) | [mas/yr] | 6.265116508 (0.8) | 8.375825737 (2) | 6.265 (0.8) | |||||
| Proper motion (declination) | [mas/yr] | -25.3956364 (0.6) | -26.15934802 (2) | -25.396 (0.6) | |||||
| Variability | |||||||||
| Magnetic | |||||||||
| Bd | [MG] | ||||||||
| Infrared excess (disk) | |||||||||
| Binarity | |||||||||
| B magnitude | |||||||||
| V magnitude | |||||||||
| R magnitude | |||||||||
| I magnitude | |||||||||
| J magnitude | |||||||||
| H magnitude | |||||||||
| K magnitude | |||||||||
| u magnitude | 21.17 (0.1) | 21.20 (0.1) | 21.20 (0.1) | ||||||
| g magnitude | 20.73 (0.04) | 20.76 (0.04) | 20.74 (0.04) | ||||||
| r magnitude | 20.65 (0.05) | 20.68 (0.05) | 20.65 (0.05) | ||||||
| i magnitude | 20.55 (0.06) | 20.60 (0.06) | 20.55 (0.07) | ||||||
| z magnitude | 20.09 (0.2) | 20.11 (0.2) | 20.11 (0.2) | ||||||
| G magnitude | 20.62 (0.07) | 20.70 | 20.62 (0.007) | ||||||
| BP magnitude | 20.66 (0.07) | 20.67 | |||||||
| RP magnitude | 20.14 (0.08) | 20.35 | |||||||
| Pan g magnitude | |||||||||
| Pan r magnitude | |||||||||
| Pan i magnitude | |||||||||
| Pan z magnitude | |||||||||
| Pan y magnitude | |||||||||
| 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.