Alpha Indi
 Location of α Indus (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Indus |
| Right ascension | 20h 37m 34.03201s[1] |
| Declination | –47° 17′ 29.4026″[1] |
| Apparent magnitude (V) | 3.11[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.3[3] km/s |
| Proper motion (μ) | RA: +49.24[1] mas/yr Dec.: +66.53[1] mas/yr |
| Parallax (π) | 33.17 ± 0.18[1] mas |
| Distance | 98.3 ± 0.5 ly (30.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 0.65[4] |
| Characteristics | |
| Spectral type | K0 III–IV[5] |
| U−B color index | +0.79[2] |
| B−V color index | +1.00[2] |
| Details | |
| Mass | 2.0[4] M☉ |
| Radius | 12[6] R☉ |
| Surface gravity (log g) | 3.00[7] cgs |
| Temperature | 4,893[7] K |
| Metallicity [Fe/H] | +0.03[7] dex |
| Age | 1[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Alpha Indi (α Ind, α Indi) is a third magnitude giant star in the constellation Indus, located about 98 light years from the Earth.[1] The stellar classification of this star is K0 III-IV,[5] so it has exhausted the hydrogen at its core and evolved away from the main sequence. It has about double the mass of the Sun and is an estimated billion years old.[4] As a giant star it has expanded to about 12 times the radius of the Sun.[6] The effective temperature of the photosphere is 4,893 K,[7] 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 Astronomical Units from the primary.[10]
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 波斯 (Bō Sī, English: Persia). In Chinese astronomy, consequently, α Indi itself is known as 波斯二 (Bō Sī èr, English: the Second Star of Persia)[12]
References
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- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 7.2 7.3 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Star Name - R.H.Allen p. 246
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 30 日)
