Alpherg
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Star Alpherg (η Piscium) |
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| AladinLite | |||||||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | fishes | ||||||||||||||||||
| Right ascension | 01 h 31 m 29.01 s | ||||||||||||||||||
| declination | + 15 ° 20 ′ 45 ″ | ||||||||||||||||||
| Apparent brightness | 3.62 likes | ||||||||||||||||||
| Typing | |||||||||||||||||||
| B − V color index | (0.98) | ||||||||||||||||||
| U − B color index | (0.72) | ||||||||||||||||||
| R − I index | (0.50) | ||||||||||||||||||
| Spectral class | G7 IIIa | ||||||||||||||||||
| Astrometry | |||||||||||||||||||
| Radial velocity | (13.78 ± 0.07) km / s | ||||||||||||||||||
| parallax | (12.03 ± 0.75) mas | ||||||||||||||||||
| distance | (270 ± 20) ly (83 ± 5) pc |
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| Proper movement | |||||||||||||||||||
| Rec. Share: | (25.94 ± 1.17) mas / a | ||||||||||||||||||
| Dec. portion: | (−4.96 ± 1.03) mas / a | ||||||||||||||||||
| Physical Properties | |||||||||||||||||||
| Dimensions | (3.78 ± 0.16) M ☉ | ||||||||||||||||||
| radius | (26.48 ± 2.15) R ☉ | ||||||||||||||||||
| Luminosity |
(460 ± 80) L ☉ |
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| Effective temperature | (4937 ± 40) K. | ||||||||||||||||||
| Metallicity [Fe / H] | (−0.13 ± 0.06) | ||||||||||||||||||
| Age | (220 ± 30) mill. A | ||||||||||||||||||
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Other names and catalog entries |
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Alpherg , Bayer name Eta Piscium (Piscium), Babylonian name Kullat Nunu is a star in the equatorial zone of the starry sky. It has an apparent magnitude of +3.62 mag and belongs to the spectral class G7IIIa. Alpherg is less than 300 light years from Earth and has a diameter that is 26 times larger than that of the Sun. There is evidence of a companion, but little is known about it so far.
Web links
Individual evidence
- ↑ a b c d e f g h i eta Psc. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on September 3, 2018 .
- ↑ a b c d e f J. Maldonado, E. Villaver, C. Eiroa: The metallicity signature of evolved stars with planets . In: Astronomy & Astrophysics . 554, June 2013, p. 18. arxiv : 1303.3418 . A84. bibcode : 2013A & A ... 554A..84M . doi : 10.1051 / 0004-6361 / 201321082 .
- ↑ Epping J., Straßmaier JN: Astronomical things from Babylon or the knowledge of the Chaldeans about the starry sky. Voices from Maria Laach - Supplement 44. Herder, Freiburg i. Br. 1889. p. 117 ( online )