Alpha Indi
Template:Location mark Location of α Indi (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Indus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 3.11[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K0 III–IV[4] |
| U−B Template:Engvar | +0.79[2] |
| B−V Template:Engvar | +1.00[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.3[5] km/s |
| Proper motion (μ) | RA: +50.922 mas/yr[1] Dec.: +66.026 mas/yr[1] |
| Parallax (π) | 32.8989±0.2225 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)[1] |
| Absolute magnitude (MV) | Script error: No such module "val".[6] |
| Details[6] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". 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 |
| Age | Script error: No such module "val".[7] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| HD 196171, HR 7869, SAO 230300, FK5 769, CD−47°13477, HIP 101772[8] | |
| Database references | |
| SIMBAD | data |
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Alpha Indi (α Ind, α Indi) is the brightest star in the southern constellation Indus. Parallax measurements imply that it is located about 100 light years from Earth.[1] It has an apparent visual magnitude of 3.22,[2] being readily visible to the naked eye, and has an absolute magnitude of +0.78.[6]
Characteristics
The stellar classification of Alpha Indi is K0 III-IV,[4] meaning that it has exhausted the hydrogen at its core and evolved away from the main sequence, being now halfway between a subgiant and a giant star. It is estimated to be 1.6 billion years old,[7] has 2.15 times the mass of the Sun, but has expanded to 9.9 times the radius of the Sun and irradiates 51 times its luminosity. The effective temperature of its photosphere is 4,900 K,[6] giving it the characteristic orange hue of a K-type star.[9] It may have two nearby M-type companion stars, which are located at least 2,000 AU from the primary.[10]
Nomenclature
Alpha Indi is the star's Bayer designation.[8] In China, this star is called Pe Sze where it also was known as the Persian, a title from the Jesuit missionaries.[11] The term Pe Sze is from the name of asterism Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx). In Chinese astronomy, consequently, α Indi itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx)[12]
References
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- ↑ a b c d e f Template:Cite Gaia DR3
- ↑ a b c d 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 Script error: No such module "Citation/CS1". Alpha Indi's database entry at VizieR.
- ↑ a b Script error: No such module "Citation/CS1". Alpha Indi's database entry at VizieR.
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Star Name - R.H.Allen p. 246
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 30 日 Template:Webarchive)
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