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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h08m 33.62529s[1] |
| Declination | −21° 11′ 37.2177″[1] |
| Apparent magnitude (V) | +5.28[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| B−V color index | +0.01[2] |
| Astrometry | |
| Proper motion (μ) | RA: +19.83[1] mas/yr Dec.: −60.15[1] mas/yr |
| Parallax (π) | 18.14 ± 0.31 mas[1] |
| Distance | 180 ± 3 ly (55.1 ± 0.9 pc) |
| Absolute magnitude (MV) | +1.59[4] |
| Details[5] | |
| Mass | 2.78 M☉ |
| Luminosity | 21[6] L☉ |
| Surface gravity (log g) | 4.33±0.14 cgs |
| Temperature | 10,878±370 K |
| Metallicity [Fe/H] | −0.41±0.06[7] dex |
| Rotational velocity (v sin i) | 212[3] km/s |
| Age | 251 Myr |
| Other designations | |
χ Cap, 25 Cap, BD−21° 5933, FK5 3690, HD 201184, HIP 104365, HR 8087, SAO 190050[8] | |
| Database references | |
| SIMBAD | data |
Chi Capricorni, Latinized from χ Capricorni, is a star in the southern constellationofCapricornus. Based upon an annual parallax shift of 18.14 mas as seen from the Earth,[1] the star is located about 180 light years from the Sun. It is visible to the naked eye with an apparent visual magnitude of +5.28.[2]
This is an A-type main sequence star with a stellar classification of A0 V.[3] It is a candidate Lambda Boötis star, showing a chemically peculiar spectrum with a low abundance of most elements heavier than oxygen.[7] The star is around 251[5] million years old and is spinning rapidly with a projected rotational velocity of 212[3] km/s. It has 2.78[5] times the mass of the Sun and is radiating 21[6] times the solar luminosity from its photosphere at an effective temperature of 10,878 K.[5]
At an angular separation of 1,199[9] arcseconds lies a faint proper motion companion designated HIP 99550. At the estimated distance of Chi Capricorni, this is equal to a projected separation of 28,300 AU.[9] It has a visual magnitude of 10.94[10] and a classification of M0 Vk,[11] indicating this is a red dwarf star.[9]
InChinese, 十二國 (Shíer Guó), meaning Twelve States, refers to an asterism which is represent twelve ancient states in the Spring and Autumn period and the Warring States period, consisting of χ Capricorni, φ Capricorni, ι Capricorni, 38 Capricorni, 35 Capricorni, 36 Capricorni, θ Capricorni, 30 Capricorni, 33 Capricorni, ζ Capricorni, 19 Capricorni, 26 Capricorni, 27 Capricorni, 20 Capricorni, η Capricorni and 21 Capricorni.[12] Consequently, the Chinese name for χ Capricorni itself represents the state Qi (齊),[13] together with 112 HerculisinLeft Wall of Heavenly Market Enclosure (asterism).[14]
R.H.Allen had opinion that χ Capricorni, together with φ Capricorni, were represent the state Wei (魏).[15]
{{cite web}}: CS1 maint: postscript (link)
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