User:Squidchirps/sandbox
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Draco |
| Right ascension | 14h 39m 00.2104s[1] |
| Declination | +64° 17′ 29.9796″[1] |
| Characteristics | |
| Spectral type | G1.5V[1] |
| Apparent magnitude (B) | 8.243[1] |
| Apparent magnitude (V) | 7.604[1] |
| Apparent magnitude (J) | 6.315±0.020[1] |
| Apparent magnitude (H) | 6.012±0.018[1] |
| Apparent magnitude (K) | 5.914±0.021[1] |
| Variable type | BY Dra[1] |
| Astrometry | |
| Radial velocity (Rv) | −20.687±0.0037 km/s |
| Proper motion (μ) | RA: -135.751 mas/yr Dec.: -37.089 mas/yr |
| Parallax (π) | 29.0661 ± 0.0217 mas |
| Distance | 112.21 ± 0.08 ly (34.40 ± 0.03 pc) |
| Other designations | |
| Database references | |
| SIMBAD | The star |
EK Dra is a young star in the Draco constellation known for both high rates and large amplitudes in its chromospheric and coronal variation. As a G1.5 dwarf at just ~100 million years old, it is a popular solar-analog to study in order to understand the activity and environment of the young Sun. As an incredibly young main sequence star, it has a correspondingly high spin rate at one rotation every 2.83 days, compared to the Sun's 27 day rotation period. The dynamo action that this fast rotation drives within the convective zone of EK Dra generates a strong, active magnetic field. This activity manifests as exceptionally strong flares, upwards of 1035erg, dubbed superflares, and possibly a coronal mass ejection.