Iota Capricorni
Template:Location mark Location of ι 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) | +4.296[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| U−B Template:Engvar | +0.63[2] |
| B−V Template:Engvar | +0.89[2] |
| Variable type | BY Dra[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] 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) | 16.2048±0.1688 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.18[6] |
| Details[5] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | 83 Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotation | 68 d[7] |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | 390 Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| ι Cap, 32 Cap, BD−17°6245, FK5 1561, HD 203387, HIP 105515, HR 8167, SAO 164346[8] | |
| Database references | |
| SIMBAD | data |
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Iota Capricorni (ι Cap, ι Capricorni) is a solitary,[9] yellow-hued star in the southern constellation of Capricornus. It can be seen with the naked eye, having an apparent visual magnitude of +4.3.[2] Based upon an annual parallax shift of 16.2 mas as seen from the Earth,[1] the star is located about 201 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.08 due to interstellar dust.[5]
This is an evolved G-type giant star with a stellar classification of G8 III.[3] It is classified as a BY Draconis type[4] variable star. This is a chromospherically-active star with a longitudinal magnetic field strength of Script error: No such module "val". and an X-ray luminosity of Script error: No such module "val"..[7] The activity and photometric variation of the star allow an estimate of its rotation period as 68 days.[7]
Iota Capricorni has an estimated 2.9 times the mass of the Sun and nearly 11 times the Solar radius. It is 390 million years old and is radiating 83 times the solar luminosity from its chromosphere at an effective temperature of 5,200 K.[5]
Observation
On 31 January 2034, it will be occulted by Venus over a small part of Siberia, Mongolia and China.[11]Template:Rp
Chinese name
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Twelve States, refers to an asterism which represents twelve ancient states in the Spring and Autumn period and the Warring States period, consisting of ι Capricorni, φ Capricorni, 38 Capricorni, 35 Capricorni, 36 Capricorni, χ 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 ι Capricorni itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx), meaning that this star (together with 37 Capricorni[13]) represents the state Dai (or Tae)(Script error: No such module "Lang".).[14][15]
Planetary system
In 2022, two exoplanets, both super-Jovian in mass, were discovered in orbit around Iota Capricorni using a combination of radial velocity and astrometry. The inner planet has a highly eccentric orbit.[16]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | Script error: No such module "val". [[Jupiter mass|Template:MvarJ]] | Script error: No such module "val". | Script error: No such module "val". | Script error: No such module "val". | — | — |
| c | Script error: No such module "val". [[Jupiter mass|Template:MvarJ]] | Script error: No such module "val". | Script error: No such module "val". | Script error: No such module "val". | Script error: No such module "val".° | — |
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References
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- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ 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.
- ↑ Iad Ridpath's Startales - Capricornus the Sea Goat
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 4 日 Template:Webarchive
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
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