Tau2 Arietis
Template:Other stars by Bayer designation
Template:Location mark Location of τ2 Arietis (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aries[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | +5.09[3] |
| Characteristics | |
| Spectral type | K3 III[4][5] |
| U−B Template:Engvar | +1.27[3] |
| B−V Template:Engvar | 1.238[6] |
| Astrometry | |
| Radial velocity (Rv) | +2.45±0.24[6] km/s |
| Proper motion (μ) | RA: −53.633 mas/yr[2] Dec.: −14.447 mas/yr[2] |
| Parallax (π) | 9.7639±0.2442 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.17[1] |
| Details | |
| Mass | 2.04±0.60[7] Template:Solar mass |
| Radius | 19[6] Template:Solar radius |
| Luminosity | 120[6] Template:Solar luminosity |
| Surface gravity (log g) | 2.23±0.11[7] cgs |
| Temperature | 4,479±92[7] K |
| Metallicity [Fe/H] | +0.02[6] dex |
| Rotational velocity (v sin i) | 3.4[6] km/s |
| Age | 1.6Script error: No such module "Su".[7] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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Tau2 Arietis is a binary star[9] system in the northern constellation on Aries. Its name is a Bayer designation that is Latinized from τ2 Arietis, and abbreviated Tau2 Ari or τ2 Ari. The combined apparent visual magnitude of this system is +5.09,[3] which is bright enough to be seen with the naked eye. With an annual parallax shift of Script error: No such module "val".,[10] it is located at a distance of approximately Script error: No such module "convert". from Earth, give or take an 8 light-year margin of error. At this distance the brightness of the star is diminished by 0.18 in magnitude because of extinction from interstellar gas and dust.[11] The system is receding from the Sun with a radial velocity of +2.5 km/s.[6]
The primary component is an evolved giant star with a stellar classification of K3 III.[4] It is an estimated 1.6 billion years old and is spinning with a projected rotational velocity of 3.4 km/s.[6] With double the mass of the Sun,[7] it has expanded to 19 times the radius of the Sun.[6] The star is radiating 120 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,406 K,[6] giving it the cool orange glow of a K-type star. At an angular separation of 0.53 arcseconds is a magnitude 8.50 companion.[9]
References
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- ↑ a b Template:Cite XHIP
- ↑ a b c d Template:Cite Gaia DR3
- ↑ a b c Script error: No such module "citation/CS1".
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- ↑ a b c d e f g h i j Script error: No such module "citation/CS1".
- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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