Chi1 Orionis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Orion |
| Right ascension | 05h 54m 22.98s[1] |
| Declination | +20° 16′ 34.2″[1] |
| Apparent magnitude (V) | 4.39 |
| Characteristics | |
| Spectral type | G0 V |
| U−B color index | 0.07 |
| B−V color index | 0.59 |
| Astrometry | |
| Radial velocity (Rv) | −13.4 km/s |
| Proper motion (μ) | RA: −162.54 ± 0.28[1] mas/yr Dec.: −99.51 ± 0.16[1] mas/yr |
| Parallax (π) | 115.43 ± 0.27[1] mas |
| Distance | 28.26 ± 0.07 ly (8.66 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.67 |
| Details | |
| Radius | 0.979 ± 0.009[2] R☉ |
| Luminosity | 1.081 ± 0.018[2] L☉ |
| Temperature | 5,955 ± 6.1[3] K |
| Metallicity [Fe/H] | −0.01[4] dex |
| Rotation | 5.2 days[4] |
| Age | 300–400[5] Myr |
| Other designations | |
Chi1 Orionis (χ1 Ori, χ1 Orionis) is a star about 28 light years away.[1] It is in the constellation Orion, where it can be seen in the tip of the Hunter's upraised club.[6]
χ1 Ori is a G0V star.[7] It has a faint companion with a mass estimated at about 15% of the mass of the Sun, an orbital period of 14.1 years, and an estimated stellar class of M6. The companion orbits an average distance of 6.1 AU from the primary, but has a fairly high orbital eccentricity, ranging from 3.3 AU out to 8.9 AU from the primary. Because of this red dwarf companion, the likelihood of habitable planets in this system is low.
A necessary condition for the existence of a planet in this system are stable zones where the object can remain in orbit for long intervals. For hypothetical planets in a circular orbit around the individual members of this star system, this maximum orbital radius is computed to be 1.01 AU for the primary and 0.41 AU for the secondary. (Note that the orbit of the Earth is 1 AU from the Sun.) A planet orbiting outside of both stars would need to be at least 18.4 AU distant.[8]
χ1 Ori is a candidate stream star member of the Ursa Major Moving Group, although there is some evidence to the contrary.[4]
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Chi 1 orionis diagram
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Chi 1 orionis diagram
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.. See Table 10.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Jim Kaler, Chi-1 Orionis.
- ↑ König, B.; Fuhrmann, K.; Neuhäuser, R.; Charbonneau, D.;Jayawardhana, R., Direct detection of the companion of chi1 Orionis Astronomy and Astrophysics, vol. 394, L43, 2002.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Chi-1 Orionis by Professor Jim Kaler.
- Chi1 Orionis 2 at SolStation.
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