Eta Arietis
 Location of η Arietis (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 12m 48.08619s[1] |
| Declination | +21° 12′ 39.5839″[1] |
| Apparent magnitude (V) | 5.231[2] |
| Characteristics | |
| Spectral type | F5 V[3] |
| U−B color index | –0.04[4] |
| B−V color index | +0.44[4] |
| Astrometry | |
| Radial velocity (Rv) | +4.5[2] km/s |
| Proper motion (μ) | RA: +163.49[1] mas/yr Dec.: +5.22[1] mas/yr |
| Parallax (π) | 34.64 ± 0.33[1] mas |
| Distance | 94.2 ± 0.9 ly (28.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +2.93[2] |
| Details | |
| Mass | 1.3 M☉ |
| Radius | 0.98[5] R☉ |
| Surface gravity (log g) | 4.01[3] cgs |
| Temperature | 6,380[3] K |
| Metallicity [Fe/H] | –0.35[3] dex |
| Rotational velocity (v sin i) | 9[6] km/s |
| Age | 2.6[2] Gyr |
| Other designations | |
Eta Arietis (η Ari, η Arietis) is the Bayer designation for a star in the northern constellation of Aries. It is dimly visible to the naked eye with an apparent visual magnitude of 5.231.[2] With an annual parallax shift of 34.64 mas,[1] the distance to this star is approximately 94.2 light-years (28.9 parsecs).
This is an F-type main sequence star with a stellar classification of F5 V.[3] It is younger than the Sun at an age of about 2.6 billion years.[2] The effective temperature of the outer atmosphere is 6,380 K,[3] giving it the yellow-white-hued glow of an F-type star. Eta Arietis was examined using the HARPS instrument for radial velocity variations that may be caused by an orbiting companion, but no signal was detected.[7] Nor has an infrared excess been detected using the Spitzer Space Telescope, which might otherwise indicate the presence of circumstellar gas or dust.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
