Epsilon Crucis
Crux, showing Epsilon Crucis in relation to the other main stars | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Crux |
Right ascension | 12h 21m 21.60936s[1] |
Declination | −60° 24′ 04.1291″[1] |
Apparent magnitude (V) | 3.59[2] |
Characteristics | |
Spectral type | K3III |
U−B color index | 1.63 |
B−V color index | 1.42 |
Astrometry | |
Radial velocity (Rv) | −4.6 km/s |
Proper motion (μ) | RA: −171.06 mas/yr Dec.: 91.83 mas/yr |
Parallax (π) | 14.30 ± -.56 mas |
Distance | 228 ± −9 ly (70 ± −3 pc) |
Absolute magnitude (MV) | −0.63 ± 0.09[3] |
Details | |
Mass | 1.42 ± 0.22[3] M☉ |
Radius | 32.9 ± 2.5[3] R☉ |
Surface gravity (log g) | 1.52 ± 0.11[3] cgs |
Temperature | 4,148[3] K |
Metallicity [Fe/H] | −0.10[3] dex |
Age | 2.83 ± 1.20[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Epsilon Crucis (ε Cru, ε Crucis) is a fourth-magnitude K-type giant star in the constellation Crux. It is sometimes called Intrometida (intrusive) in Portuguese.[4] This star is an orange giant, located about 228 light-years from Earth.
Modern legacy
ε Cru is represented on the flags of Australia and Papua New Guinea. It is also featured in the flag of Brazil, along with 26 other stars, each of which represents a state. ε Cru represents the State of Espírito Santo.[5]
References
- 1 2 van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.
- ↑ "eps Cru". SIMBAD. Centre de données astronomiques de Strasbourg.
- 1 2 3 4 5 6 7 da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, Bibcode:2006A&A...458..609D, arXiv:astro-ph/0608160 , doi:10.1051/0004-6361:20065105
- ↑ da Silva Oliveira, R., "Crux Australis: o Cruzeiro do Sul", Artigos: Planetario Movel Inflavel AsterDomus.
- ↑ "Astronomy of the Brazilian Flag". FOTW Flags Of The World website.
External links
- "HD 107446". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-10-28.
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