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Eta Arae

Eta Arae
Diagram showing star positions and boundaries of the Ara constellation and its surroundings
Cercle rouge 100%.svg

The location of η Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 16h 49m 47.15653s
Declination –59° 02′ 28.9575″
Apparent magnitude (V) 3.76
Characteristics
Spectral type K5 III
U−B color index +1.93
B−V color index +1.57
Astrometry
Radial velocity (Rv) +9.0 km/s
Proper motion (μ) RA: +39.73 mas/yr
Dec.: –24.91 mas/yr
Parallax (π) 10.90 ± 0.20mas
Distance 299 ± 5 ly
(92 ± 2 pc)
Absolute magnitude (MV) –1.14 ± 0.14
Details
Mass 1.02 ± 0.12 M
Radius 55.9 ± 7.3 R
Surface gravity (log g) 0.92 ± 0.12 cgs
Temperature 3,886 K
Metallicity [Fe/H] –0.37 dex
Age 7.11 ± 2.34 Gyr
Other designations
CPD–58° 6906, FK5 1435, HD 151249, HIP 82363, HR 6229, SAO 244168.
Database references
SIMBAD data

Eta Arae (η Ara, η Arae) is the Bayer designation for a single star in the southern constellation of Ara. It is approximately 299 light-years (92 parsecs) from Earth and is visible to the naked eye with an apparent visual magnitude of 3.76.

The spectrum of this star matches a stellar classification of K5 III, indicating that, at an estimated age of seven billion years, it has reached the giant star stage of its evolution. With a mass nearly the same as the Sun, it has an outer envelope that has expanded to nearly 56 times the Sun's radius. The star is now spinning so slowly that it takes more than eleven years to complete a single rotation. Eta Arae is radiating energy into space at an effective temperature of 3,886 K, giving it the orange-hued glow of a K-type star.

It has a 14th magnitude optical companion, located 25.7 arcseconds away.


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Wikipedia

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