Iota Leonis
Template:Location mark Location of ι Leonis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.00[2] |
| Characteristics | |
| Spectral type | F4 IV[3] + F3 V + K4 V[4] |
| U−B Template:Engvar | +1.420[5] |
| B−V Template:Engvar | +0.456[5] |
| Variable type | Suspected[6] |
| Astrometry | |
| Radial velocity (Rv) | −10.3[7] km/s |
| Proper motion (μ) | RA: +141.45[1] mas/yr Dec.: −79.14[1] mas/yr |
| Parallax (π) | 41.26±1.16 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +2.13[8] |
| Orbit[9] | |
| Primary | ι Leo A |
| Companion | ι Leo B |
| Period (P) | Script error: No such module "val". yr |
| Semi-major axis (a) | Script error: No such module "val".″ |
| 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". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Details | |
| ι Leo A | |
| Mass | Script error: No such module "val".[9] Template:Solar mass |
| Radius | Script error: No such module "val".[3] Template:Solar radius |
| Luminosity | 11.5[3] Template:Solar luminosity |
| Surface gravity (log g) | 3.98[10] cgs |
| Temperature | 6,739[10] K |
| Metallicity [Fe/H] | 0.06[10] dex |
| Rotational velocity (v sin i) | 16[3] km/s |
| Age | Script error: No such module "val".[3] Gyr |
| ι Leo B | |
| Mass | Script error: No such module "val".[9] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[2] | |
| Database references | |
| SIMBAD | A |
| B | |
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Iota Leonis, Latinized from ι Leonis, is a quadruple star system[4] in the constellation Leo. The system is fairly close to the Sun, at only 79 light-years (24.2 parsecs) away, based on its parallax.[1] The system has a combined apparent magnitude of 4.00[2] making it faintly visible to the naked eye. It is moving closer to the Sun with a radial velocity of −10 km/s.[7]
The primary star, Iota Leonis A, has a spectral type of F3 IV,[3] matching that of an F-type subgiant star. The second component in the star system is designated Iota Leonis B. It orbits the primary every 190 years, and with its perihelion passage in 1948, the separation between the two is steadily growing.[9] The pair is also listed as a single-lined spectroscopic binary.[11] It is a F-type main-sequence star[4] with a mass 18.3% greater than that of the Sun.[9]
The outer companion is designated StKM 2-732[12] and is also called Iota Leonis C.[13] It has an angular separation from the inner pair by 331" along a position angle of 346°, and is itself a close binary. The combined spectrum is K6V.[4]
Name
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Right Wall of Supreme Palace Enclosure, refers to an asterism consisting of ι Leonis, β Virginis, σ Leonis, θ Leonis and δ Leonis.[14] Consequently, the Chinese name for ι Leonis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx),[15] representing Script error: No such module "Lang". (Script error: No such module "Lang".), meaning The Second Western General.[16] 西次將 (Xīcìjiāng), spelled Tsze Tseang by R.H. Allen, means "the Second General".[17]
See also
References
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- ↑ a b c d e f Script error: No such module "Citation/CS1". Note: see VizieR catalogue I/311.
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c d e f Script error: No such module "Citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1". Iota Leonis' database entry at VizieR.
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b c d e Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "Citation/CS1". Catalogue can be accessed here.
- ↑ 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.
- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Script error: No such module "webarchive"., Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Template:In lang English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Script error: No such module "webarchive"., Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Script error: No such module "citation/CS1".
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