All names: Gaia DR2 1355161726346266112, GALEX J170847.7+424100, PG 1707+427, SDSS J170847.68+424100.8, V* V817 Her, WD 1707+427, SDSS J170847.69+424100.7, Gaia EDR3 1355161726346266112, SDSS J170847.68+424100.6, Gaia DR3 1355161726346266112, SDSS J170847.68+424100.7
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | SDSS DR12 | Gaia DR2 | Stilism | Werner & Herwig 2006 | Vincent et al. 2024 | Simbad | White Dwarf Research Corporation | White Dwarf Catalog (McCook & Sion 1999) | Kleinman et al. 2013 | Vincent et al. 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 17 08 47.67 (0.04) | 17 08 47.68 | 17 08 47.67 (0.06) | 17 08 47.67 | 17 08 47.69 (0.04) | 17 08 47.69 | 17 08 47.69 | ||||||
| Declination | 42 41 00.88 (0.05) | 42 41 00.66 | 42 41 00.87 (0.07) | 42 41 00.88 | 42 41 00.56 (0.05) | 42 41 02.76 | 42 41 00.73 | ||||||
| Spectral type | PG1159 | DC: | PG1159 | PG1159 | DOZ1 | PG1159 | PG1159 | ||||||
| Effective temperature | [K] | 85000.0 | 85000.0 | 100000.0 (794) | |||||||||
| log(g) | [cgs] | 7.50 | 5.00 (0.003) | ||||||||||
| Mass | [M☉] | 0.59 | |||||||||||
| log(Luminosity) | [L☉] | ||||||||||||
| Cooling age | [Gyr] | ||||||||||||
| log(H/He) | |||||||||||||
| log(C/He) | -0.0457574906 | ||||||||||||
| log(Ca/He) | |||||||||||||
| log(Ca/H) | |||||||||||||
| Parallax | [mas] | 1.40 (0.05) | 1.30 (0.07) | 1.40 | 1.40 (0.05) | ||||||||
| Distance | [pc] | 713.31 (26) | 770.22 (41) | 713.31 | 713.32 (26) | ||||||||
| Composition | |||||||||||||
| Proper motion (right ascension) | [mas/yr] | -9.751241561 (0.06) | -9.809177777 (0.1) | -9.751 (0.06) | |||||||||
| Proper motion (declination) | [mas/yr] | 20.13691979 (0.07) | 20.12212709 (0.2) | 20.137 (0.07) | |||||||||
| Variability | VAR | VAR | |||||||||||
| Magnetic | |||||||||||||
| Bd | [MG] | ||||||||||||
| Infrared excess (disk) | |||||||||||||
| Binarity | |||||||||||||
| B magnitude | 16.08 | ||||||||||||
| V magnitude | 16.69 | ||||||||||||
| R magnitude | |||||||||||||
| I magnitude | |||||||||||||
| J magnitude | |||||||||||||
| H magnitude | |||||||||||||
| K magnitude | |||||||||||||
| u magnitude | 15.97 (0.006) | 15.97 (0.006) | 15.92 (0.03) | ||||||||||
| g magnitude | 16.41 (0.004) | 16.41 (0.004) | 16.38 (0.01) | ||||||||||
| r magnitude | 16.95 (0.005) | 16.95 (0.005) | 16.93 (0.01) | ||||||||||
| i magnitude | 17.36 (0.006) | 17.36 (0.006) | 17.33 (0.01) | ||||||||||
| z magnitude | 17.66 (0.02) | 17.66 (0.02) | 17.68 (0.02) | ||||||||||
| G magnitude | 16.65 (0.007) | 16.68 | 16.65 | 16.65 (0.003) | |||||||||
| BP magnitude | 16.45 (0.007) | 16.37 | |||||||||||
| RP magnitude | 17.03 (0.01) | 17.00 | |||||||||||
| Pan g magnitude | 16.46 (0.008) | ||||||||||||
| Pan r magnitude | 16.94 (0.006) | ||||||||||||
| Pan i magnitude | 17.35 (0.003) | ||||||||||||
| Pan z magnitude | 17.62 (0.004) | ||||||||||||
| Pan y magnitude | 17.85 (0.02) | ||||||||||||
| E(B-V) | 0.027 | ||||||||||||
* 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.