PG 1644+199
All names: 2MASS J16461975+1946036, PG 1644+199, WISE J164619.79+194602.5, TIC 258200088, Gaia EDR3 4563152548683139968, Gaia DR3 4563152548683139968, PG, UCAC4 549-057996, WDJ164619.76+194603.64, Gaia DR2 4563152548683139968, GALEX J164619.8+194603, SDSS J164619.76+194603.3, WD 1644+198, SDSS J164619.76+194603.4, WISEA J164619.79+194602.5
| Parameter | Unit | Gaia EDR3 | Pan-STARRS DR1 | MWDD HE | Gaia DR2 | Stilism | Bergeron et al. 2011 | Zuckerman et al. 2010 | Vincent et al. 2024 | Simbad | Gentile Fusillo et al. 2018 | White Dwarf Catalog (McCook & Sion 1999) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | 16 46 19.81 (0.02) | 16 46 19.81 (0.03) | 16 46 19.81 | 16 46 19.76 (0.02) | 16 46 19.81 | 16 46 18.98 | ||||||
| Declination | 19 46 02.04 (0.02) | 19 46 02.09 (0.03) | 19 46 02.04 | 19 46 03.64 (0.02) | 19 46 02.09 | 19 46 03.00 | ||||||
| Spectral type | DB | DB | DBZ | DB | DB4 | DB4 | ||||||
| Effective temperature | [K] | 14150.0 | 15190.0 (383) | 15000.0 | 15182.0 (95) | |||||||
| log(g) | [cgs] | 7.95 | 8.12 (0.1) | 8.04 (0.008) | ||||||||
| Mass | [M☉] | 0.559 | 0.66 (0.06) | 0.616 (0.006) | ||||||||
| log(Luminosity) | [L☉] | -2.18 | ||||||||||
| Cooling age | [Gyr] | 0.2198 | 0.2399 | 2.2000 | ||||||||
| log(H/He) | <-5.42 (0.3) | |||||||||||
| log(C/He) | ||||||||||||
| log(Ca/He) | -10.3 | |||||||||||
| 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] | 17.78 (0.03) | 17.77 (0.04) | 17.78 | 17.78 (0.03) | 17.77 (0.04) | ||||||
| Distance | [pc] | 56.26 (0.09) | 56.28 (0.1) | 56.00 | 56.26 | 56.26 (0.09) | 56.28 (0.1) | |||||
| Composition | He | He | ||||||||||
| Proper motion (right ascension) | [mas/yr] | 50.79467919 (0.02) | 50.78983092 (0.05) | 50.795 (0.02) | 50.78983092 | |||||||
| Proper motion (declination) | [mas/yr] | -100.0213609 (0.02) | -100.1055351 (0.06) | -100.021 (0.02) | -100.1055351 | |||||||
| Variability | ||||||||||||
| Magnetic | ||||||||||||
| Bd | [MG] | |||||||||||
| Infrared excess (disk) | ||||||||||||
| Binarity | ||||||||||||
| B magnitude | 15.03 (0.03) | |||||||||||
| V magnitude | 15.20 | 15.07 (0.08) | ||||||||||
| R magnitude | 15.18 (0.2) | |||||||||||
| I magnitude | ||||||||||||
| J magnitude | 15.39 (0.06) | |||||||||||
| H magnitude | 15.45 (0.1) | |||||||||||
| K magnitude | 15.32 (0.1) | |||||||||||
| u magnitude | 14.82 (0.004) | 14.82 (0.004) | ||||||||||
| g magnitude | 14.92 (0.004) | 14.92 (0.004) | ||||||||||
| r magnitude | 15.21 (0.004) | 15.21 (0.004) | ||||||||||
| i magnitude | 15.46 (0.004) | 15.46 (0.004) | ||||||||||
| z magnitude | 15.70 (0.006) | 15.70 (0.006) | ||||||||||
| G magnitude | 15.06 (0.0009) | 15.07 | 15.06 | 15.06 (0.003) | 15.07 | |||||||
| BP magnitude | 15.00 (0.0009) | 14.95 | 14.95 | |||||||||
| RP magnitude | 15.14 (0.001) | 15.14 | 15.14 | |||||||||
| Pan g magnitude | 14.99 (0.004) | |||||||||||
| Pan r magnitude | 15.23 (0.002) | |||||||||||
| Pan i magnitude | 15.49 (0.002) | |||||||||||
| Pan z magnitude | 15.70 (0.003) | |||||||||||
| Pan y magnitude | 15.84 (0.006) | |||||||||||
| E(B-V) | 0.003 | |||||||||||
* Constant surface field
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