Eta Arae
Template:Location mark The location of η Arae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 3.76[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B Template:Engvar | +1.93[2] |
| B−V Template:Engvar | +1.57[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.00±0.14[4] km/s |
| Proper motion (μ) | RA: +38.990 mas/yr[1] Dec.: −26.095 mas/yr[1] |
| Parallax (π) | 10.6993±0.1289 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val".[5] |
| Details[4] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | 575 Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
Eta Arae is a single[7] star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from η Arae, and abbreviated Eta Ara or η Ara. This star is visible to the naked eye with an apparent visual magnitude of 3.76.[2] Based on parallax measurements, it is approximately Script error: No such module "convert". distance from Earth.[1] The star is moving away from the Sun with a radial velocity of +9 km/s.[4]
The spectrum of this star matches a stellar classification of K5 III,[3] indicating that, at an estimated age of five billion years,[4] it has reached the giant star stage of its evolution. With 1.12 times the mass of the Sun, it has an outer envelope that has expanded to 40 times the Sun's radius.[4] The star is now spinning so slowly that it takes more than eleven years to complete a single rotation.[8] Eta Arae is radiating energy into space from its photosphere with 575 times the Sun's luminosity at an effective temperature of 4,147 K,[4] giving it the orange-hued glow of a K-type star.[9]
It has a magnitude 13.5 optical companion, located 23.4 arcseconds away along a position angle of 118°, as of 2000.[10]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c d e Template:Cite Gaia EDR3
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".