Eta Arietis
Template:Location mark Location of η Arietis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.227±0.023[2] |
| Characteristics | |
| Spectral type | F5 V[3] |
| U−B Template:Engvar | –0.04Script error: No such module "Unsubst". |
| B−V Template:Engvar | +0.435[2] |
| Astrometry | |
| Radial velocity (Rv) | +5.38±0.19[1] km/s |
| Proper motion (μ) | RA: +163.917 mas/yr[1] Dec.: +5.000 mas/yr[1] |
| Parallax (π) | 33.3383±0.1196 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +2.93[4] |
| Details | |
| Mass | 1.30±0.19[2] Template:Solar mass |
| Radius | 1.95±0.08[2] Template:Solar radius |
| Luminosity | 5.91±0.23[2] Template:Solar luminosity |
| Surface gravity (log g) | 3.97±0.08[2] cgs |
| Temperature | 6,443±107[2] K |
| Metallicity [Fe/H] | –0.35[3] dex |
| Rotational velocity (v sin i) | 9[5] km/s |
| Age | 2.6 Gyr[4] 3.98[6] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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Eta Arietis is a star in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from η Arietis, and abbreviated Eta Ari or η Ari. This star is dimly visible to the naked eye with an apparent visual magnitude of 5.231.[4] Based on an annual parallax shift of Script error: No such module "val".,[1] the distance to this star is Script error: No such module "convert".. It is drifting further away from the Sun with a radial velocity of +5 km/s.[1]
This is an ordinary F-type main-sequence star with a stellar classification of F5 V.[3] It is younger than the Sun with an age of about 2.6 billion years,[4] and is spinning with a projected rotational velocity of 9 km/s. This star has 1.3 times the mass of the Sun and double the Sun's radius. It is radiating 5.9 times the luminosity of the Sun from its photosphere at an effective temperature of the outer atmosphere is 6,443 K,[2] giving it the yellow-white-hued glow of an F-type star. The abundance of elements more massive than helium in the stellar atmosphere is lower than in the Sun.[3]
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.[8] Nor has an infrared excess been detected using the Spitzer Space Telescope, which might otherwise indicate the presence of circumstellar gas or dust.[9]
References
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- ↑ a b c d e f g Template:Cite Gaia DR2
- ↑ a b c d e f g h Script error: No such module "citation/CS1". eta Arietis' database entry at VizieR.
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ 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".
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