Pi Arietis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 49m 17.5599s |
| Declination | +17° 27′ 51.512″ |
| Apparent magnitude (V) | 5.314 |
| Characteristics | |
| Spectral type | B6V |
| U−B color index | -0.47 |
| B−V color index | -0.06 |
| Astrometry | |
| Radial velocity (Rv) | 8.8 km/s |
| Proper motion (μ) | RA: 3.65 mas/yr Dec.: -14.61 mas/yr |
| Parallax (π) | 5.41 ± 1.06 mas |
| Distance | approx. 600 ly (approx. 180 pc) |
| Absolute magnitude (MV) | 5.226 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 20,000 L☉ |
| Temperature | 10,000–30,000 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
| Database references | |
| SIMBAD | data |
Pi Arietis (π Ari, π Arietis) is a spectroscopic binary star system in the constellation Aries. It is approximately 603 light years from Earth.
The pair is classified as a blue-white B-type main sequence dwarf with an apparent magnitude of +5.26. At 3.2 arcseconds from the binary is a white A-type main sequence star with an apparent magnitude of 8.8. At 25.2 arcseconds from A is a magnitude +10.9 yellow-white F-type main sequence star.
[edit] Name
This star, along with δ Ari, ε Ari, ζ Ari, and ρ3 Ari, were Al Bīrūnī's Al Buṭain (ألبطين), the dual of Al Baṭn, the Belly.[1]. According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buṭain were the title for five stars : δ Ari as Botein, π Ari as Al Buṭain I, ρ3 Ari as Al Buṭain II, ε Ari as Al Buṭain III dan ζ Ari as Al Buṭain IV[2]
In Chinese, 左更 (Zuǒ Gēng), meaning Official in Charge of the Forest, refers to an asterism consisting of π Arietis, ν Arietis, μ Arietis, ο Arietis and σ Arietis.[3] Consequently, π Arietis itself is known as 左更五 (Zuǒ Gēng wu, English: the Fifth Star of Official in Charge of the Forest.)[4]
[edit] References
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 83. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Aries*.html. Retrieved 2010-12-12.
- ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 9789867332257.
- ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 21 日
[edit] External links
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