WD 1647+397
All names: SDSS J164847.06+393916.9, WD 1647+397, SDSS J164847.05+393916.9, SDSS J164847.07+393917.0, Gaia EDR3 1352692734330406912, Gaia DR3 1352692734330406912, WDJ164847.07+393916.93, SDSS J164847.05+393917.0, Gaia DR2 1352692734330406912, J1648+3939
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | Kilic et al. 2025 | Caron et al. 2023 | MWDD H | MWDD HE | Gaia DR2 | Stilism | Simbad | Gentile Fusillo et al. 2018 | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 48 46.89 (0.08) | 16 48 46.90 (0.1) | 16 48 47.07 (0.08) | 16 48 46.90 | 16 48 47.04 | |||||||
| Declination | 39 39 17.00 (0.1) | 39 39 16.99 (0.1) | 39 39 16.93 (0.1) | 39 39 16.99 | 39 39 14.04 | |||||||
| Spectral type | DC | DC | DC | DC | DC | DC9.3 | ||||||
| Effective temperature | [K] | 4951.0 (24) | 4999.0 (23) | 5404.0 | 5164.0 | |||||||
| log(g) | [cgs] | 7.15 (0.01) | 6.94 (0.02) | 7.17 | 6.92 | |||||||
| Mass | [M☉] | 0.27 (0.006) | 0.167 (0.005) | 0.222 | 0.145 | |||||||
| log(Luminosity) | [L☉] | |||||||||||
| Cooling age | [Gyr] | 1.8300 | 1.2500 | |||||||||
| log(H/He) | ||||||||||||
| log(C/He) | ||||||||||||
| log(Ca/He) | ||||||||||||
| 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] | 10.79 (0.1) | 10.54 (0.1) | 10.54 (0.1) | 10.79 (0.1) | 10.54 (0.1) | ||||||
| Distance | [pc] | 92.67 (0.9) | 94.88 (1) | 94.90 (1) | 92.67 (0.9) | 94.90 (1) | ||||||
| Composition | He | He | ||||||||||
| Proper motion (right ascension) | [mas/yr] | -130.5332796 (0.1) | -130.5405311 (0.2) | -130.533 (0.1) | -130.5405311 | |||||||
| Proper motion (declination) | [mas/yr] | 4.219105713 (0.1) | 3.968357679 (0.3) | 4.219 (0.1) | 3.968357679 | |||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | ||||||||||||
| B magnitude | ||||||||||||
| V magnitude | ||||||||||||
| R magnitude | ||||||||||||
| I magnitude | ||||||||||||
| J magnitude | 17.19 (0.05) | 17.19 (0.05) | ||||||||||
| H magnitude | 17.33 (0.09) | 17.33 (0.09) | ||||||||||
| K magnitude | 17.58 (0.09) | 17.58 (0.09) | ||||||||||
| u magnitude | 20.22 (0.04) | 20.21 (0.04) | 20.21 (0.04) | 20.10 | ||||||||
| g magnitude | 18.89 (0.009) | 18.89 (0.009) | 18.81 | |||||||||
| r magnitude | 18.32 (0.007) | 18.32 (0.007) | 18.27 | |||||||||
| i magnitude | 18.14 (0.008) | 18.14 (0.008) | 18.11 | |||||||||
| z magnitude | 18.10 (0.02) | 18.10 (0.02) | 18.05 | |||||||||
| G magnitude | 18.36 (0.04) | 18.37 | 18.36 (0.003) | 18.37 | ||||||||
| BP magnitude | 18.99 (0.04) | 18.77 | 18.77 | |||||||||
| RP magnitude | 18.18 (0.07) | 17.79 | 17.79 | |||||||||
| Pan g magnitude | 18.80 (0.005) | 18.80 (0.006) | ||||||||||
| Pan r magnitude | 18.33 (0.006) | 18.33 (0.006) | ||||||||||
| Pan i magnitude | 18.14 (0.004) | 18.14 (0.004) | ||||||||||
| Pan z magnitude | 18.10 (0.007) | 18.10 (0.006) | ||||||||||
| Pan y magnitude | 18.06 (0.01) | 18.06 (0.01) | ||||||||||
| E(B-V) | 0.014 | |||||||||||
* Constant surface field
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