Chi1 Orionis

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Template:Short description

Template:Other stars by Bayer designation

Chi1 Orionis A
File:Chi 1 orionis diagram vectorized.svg
Star map of the Bayers Stars in Orion. Chi1 Orionis is indicated.
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.38 - 4.41[2]
Characteristics
Spectral type G0 V[3]
U−B Template:Engvar +0.07[4]
B−V Template:Engvar +0.59[4]
Variable type RS CVn[2]
Astrometry
Radial velocity (Rv)−15.42[1] km/s
Proper motion (μ) RA: Script error: No such module "val". mas/yr[1]
Dec.: Script error: No such module "val". mas/yr[1]
Parallax (π)114.9497±0.528 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Script error: No such module "val".[5]
Orbit[6]
Period (P)Script error: No such module "val".
Semi-major axis (a)Script error: No such module "val". mas
Eccentricity (e)Script error: No such module "val".
Inclination (i)Script error: No such module "val".°
Longitude of the node (Ω)Script error: No such module "val".°
Periastron epoch (T)Script error: No such module "val". JD
Argument of periastron (ω)
(secondary)		Script error: No such module "val".°
Semi-amplitude (K1)
(primary)		Script error: No such module "val". km/s
Details
primary
Mass1.01[7] Template:Solar mass
RadiusScript error: No such module "val".[8] Template:Solar radius
LuminosityScript error: No such module "val".[8] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[8] cgs
TemperatureScript error: No such module "val".[8] K
Metallicity [Fe/H]Script error: No such module "val".[8] dex
Rotation5.2 days[9]
Rotational velocity (v sin i)8.7[7] km/s
Age300–400[10] Myr
companion
Mass0.15[7] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Age70-130[7] Myr
Other designations
54 Ori, Gl 222, HR 2047, BD+20°1162, HD 39587, LTT 11743, GCTP 1354.00, SAO 77705, HIP 27913
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

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.[11]

File:Chi1OriLightCurve.png
A light curve for Chi1 Orionis, plotted from TESS data.[12] The 5.5 day period derived by Stępień and Geyer is marked in red.

χ1 Ori is a G0V star.[7] It is listed in the General Catalog of Variable Stars as an RS Canum Venaticorum variable, varying between visual magnitude 4.38 and 4.41.[2] Stępień and Geyer measured its period to be 5.5 days.[13]

χ1 Ori has a faint companion with a mass estimated at 15% of the mass of the Sun, and an orbital period of 14.1 years. 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. It is thought that the companion is a red dwarf still contracting towards the main sequence.[7]

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.[14]

χ1 Ori is a candidate stream star member of the Ursa Major Moving Group, although there is some evidence to the contrary.[9]

See also

References

  1. ↑ a b c d e f Template:Cite Gaia DR3
  2. ↑ a b c Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "Citation/CS1".
  4. ↑ a b Script error: No such module "Citation/CS1".
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ a b c d e f Script error: No such module "Citation/CS1".
  8. ↑ a b c d e Script error: No such module "Citation/CS1". Chi1 Orionis' database entry at VizieR.
  9. ↑ a b Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".

External links

Template:Stars of Orion Template:Sky

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