User:Mike s/draft
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CC Eridani is a spectroscopic binary star with an orbital period of 1.56 days that is also a BY Draconis variable star.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 02h 34m 22.5662s[1] |
| Declination | −43° 47′ 46.869″[1] |
| Apparent magnitude (V) | 8.83[2] |
| Characteristics | |
| Spectral type | K7.5Ve/M3.5Ve[3] |
| Apparent magnitude (J) | 5.795±0.018[4] |
| Apparent magnitude (H) | 5.126±0.027[4] |
| Apparent magnitude (K) | 4.885±0.016[4] |
| Variable type | BY Draconis variable |
| Astrometry | |
| Radial velocity (Rv) | 41.94[5] km/s |
| Proper motion (μ) | RA: 57.516(32) mas/yr[1] Dec.: −293.474(36) mas/yr[1] |
| Parallax (π) | 86.6124±0.0355 mas[1] |
| Distance | 37.66 ± 0.02 ly (11.546 ± 0.005 pc) |
| Orbit[3] | |
| Primary | CC Eridani A |
| Name | CC Eridani B |
| Period (P) | 1.5615 days |
| Eccentricity (e) | 0 |
| Semi-amplitude (K1) (primary) | 37.185 km/s |
| Semi-amplitude (K2) (secondary) | 69.289 km/s |
| Details[3] | |
| CC Eridani A | |
| Mass | 0.57 M☉ |
| Radius | 0.645 R☉ |
| Age | 30[6] Myr |
| CC Eridani B | |
| Mass | 0.306 M☉ |
| Radius | 0.41 R☉ |
| Other designations | |
| HD 16157, HIP 11964, TYC 7558-585-1, 2MASS J02342256-4347467[7] | |
Observational history
CC Eridani was first noticed, other than catalog entries, when a parallax measurement determined at Cape Observatory in South Africa showed that it was a relatively nearby star.[8] Due to its status as a nearby star radial velocity measurements were obtained starting in 1951 by David Stanley Evans at Radcliffe Observatory, Pretoria, South Africa. These measurements revealed that it was a spectroscopic binary and photometric measurements were initiated in 1956 to determine if it was variable.[5] The first year of photometric observations indicated a possible eclipsing binary[9] however subsequent years observations did not fit the eclipsing binary model.[5]
Properties
Variability
Two x-ray superflares were detected by the Swift Observatory.[10]
Multiple flares were detected by the South Pole Telescope in the millimeter range.[11]