Rho Capricorni

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Template:Short description

Rho Capricorni
Template:Location mark
Location of ρ Capricorni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Capricornus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.78[2] (4.97 + 6.88)[3]
Characteristics
Spectral type F2 IV[2] + G1[4]
Astrometry
Radial velocity (Rv)+18.4[5] km/s
Proper motion (μ) RA: −14.98[1] mas/yr
Dec.: −7.29[1] mas/yr
Parallax (π)33.04±0.46 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)2.52 + 4.56[4]
Orbit[3]
Period (P)278 yr
Semi-major axis (a)1.877″
Eccentricity (e)0.91
Inclination (i)113.3°
Longitude of the node (Ω)162.0°
Periastron epoch (T)1965.0
Argument of periastron (ω)
(secondary)		144.5°
Details[6]
ρ Cap A
MassTemplate:Val Template:Solar mass
Radius1.3[2] Template:Solar radius
Luminosity9[7] Template:Solar luminosity
Surface gravity (log g)Template:Val cgs
TemperatureTemplate:Val K
Metallicity [Fe/H]Template:Val dex
Rotational velocity (v sin i)87.7[8] km/s
AgeTemplate:Val Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
ρ Cap, 11 Cap, ADS 13887, BD−18°5689, Gl 791.1, GJ 9696, HD 194943, HIP 101027, HR 7822, SAO 163614, WDS J20289-1749AB[9]
Database references
SIMBADρ Cap
ρ Cap A
ρ Cap B
ARICNSρ Cap A
ρ Cap B

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Rho Capricorni (ρ Cap, ρ Capricorni) is a binary star[3] in the constellation Capricornus. Sometimes, this star is called by the name Bos, meaning the cow in Latin.[10] In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Ox (asterism), refers to an asterism consisting of β Capricorni, α2 Capricorni, ξ2 Capricorni, π Capricorni, ο Capricorni and ρ Capricorni.[11] Consequently, the Chinese name for ρ Capricorni itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[12]

This system is visible to the naked eye with a combined apparent visual magnitude of +4.78.[2] The pair orbit each other with a period of 278 years and an eccentricity of 0.91.[3] Based upon an annual parallax shift of 33.04 mas as seen from the Earth,[1] the system is located about 99 light years from the Sun. It is a thin disk population[6] star system that made its closest approach to the Sun about 1.6 million years ago when it came within Template:Convert.[13]

The primary member, component A, is a yellow-white hued, F-type subgiant with an apparent magnitude of 4.97[3] and a stellar classification of F2 IV.[2] This star has 1.5[6] times the mass of the Sun and 1.3 times the Sun's radius. It is radiating 9 times[7] as much luminosity of the Sun from its outer atmosphere at an effective temperature of 6,911 K.[6] The companion, component B, has a visual magnitude of 6.88.[3] The mass ratio is 0.539, meaning the secondary is only 53.9% as massive as the primary.[14]

References

Template:Reflist

Template:Stars of Capricornus

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named aass85_3_1015
  3. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named orb6
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Cvetkovic2010
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Wilson1953
  6. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Ramirez2012
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named McDonald2012
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Schroeder2009
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named CoW
  11. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  12. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 13 日 Template:Webarchive
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aa575_A35
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Makarov
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