Eta Pegasi
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 43m 00.1s |
| Declination | +30° 13' 17" |
| Apparent magnitude (V) | +2.94 |
| Absolute magnitude (V) | –1.18[1] |
| Distance | 215 ly (66 pc) |
| Spectral type | G2II-III + F0V |
| Other designations | |
Eta Pegasi (η Peg) is a star in the constellation Pegasus. It has the traditional name Matar (سعد المطر - lucky star of rain).
Eta Pegasi is of spectral class G2II-III and has apparent magnitude +3.1. It is approximately 215 light years from Earth. It has a close companion of class F0V. There are also 2 class G stars further away that may or may not be physically related to the main pair.
This star has 4.16 times the mass of the Sun, with a projected rotational velocity of 1.7 km s–1 and an estimated rotation period of 818 days.[1]
[edit] Namesakes
USS Matar (AK-119) was a United States Navy Crater class cargo ship named after the star.
[edit] References
- ^ a b Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics 361: 614–628, Bibcode 2000A&A...361..614P
[edit] External links
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