Eta Piscium
|
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 31m 29.0s |
| Declination | +15° 20' 45" |
| Apparent magnitude (V) | +3.62 |
| Distance | 294 ly (90 pc) |
| Spectral type | G7IIIa |
| Other designations | |
Eta Piscium (Eta Psc, η Piscium, η Psc), also named Alpherg,[1] is the brightest star in the constellation Pisces. Eta Piscium is located at a distance of about 294 light years from Earth, and shines at magnitude +3.62. It is of Spectral type G7 III.
The total luminosity of this star is 316 times that of the Sun, while its surface temperature is 4930 kelvin. The star has a radius of 26 ± 2[2] solar radii, while its mass is 3.5 to 4 solar masses.
Eta Piscium has a faint companion star with a separation of about 1".
Name and etymology
- The star had an obscure Babylonian name Kullat Nūnu−the latter being the Babylonian word for fish and the former "Kullat" referring to either a bucket or the cord that ties the fish together.[3]
- In Chinese, 右更 (Yòu Gèng), meaning Official in Charge of the Pasturing, refers to an asterism consisting of η Piscium, ρ Piscium, π Piscium, ο Piscium and 104 Piscium. Consequently, η Piscium itself is known as 右更二 (Yòu Gèng èr, English: the Second Star of Official in Charge of the Pasturing.)[4]
References
- ↑ "Pisces Constellation: Facts About the Fishes". Retrieved 29 September 2016.
- ↑ Nordgren, Tyler E.; et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal, 118 (6): 3032–3038, Bibcode:1999AJ....118.3032N, doi:10.1086/301114
- ↑ Allen, Richard Hinckley, (1963) [1899]. Star Names: Their Lore and Meaning (rep. ed.). New York, NY: Dover Publications Inc. pp. 328–29. ISBN 0-486-21079-0.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
External links
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