2 Aurigae
Template:Location mark Location of 2 Aurigae (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.79[2] |
| Characteristics | |
| Spectral type | K3- III Ba0.4[3] |
| B−V Template:Engvar | Template:Val[4] |
| Astrometry | |
| Radial velocity (Rv) | Template:Val[4] km/s |
| Proper motion (μ) | RA: −25.731[1] mas/yr Dec.: −3.867[1] mas/yr |
| Parallax (π) | 6.3340±0.2695 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | –1.84[2] |
| Details | |
| Mass | 2.86[5] Template:Solar mass |
| Radius | Template:Val[1] Template:Solar radius |
| Luminosity | Template:Val[1] Template:Solar luminosity |
| Surface gravity (log g) | 1.79[6] cgs |
| Temperature | Template:Val[1] K |
| Metallicity [Fe/H] | Template:Val[4] dex |
| Rotational velocity (v sin i) | 2.3[6] km/s |
| Age | 1.80[5] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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2 Aurigae is a possible binary star system in the northern constellation of Auriga. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of +4.79.[2] It forms an attractive four-star asterism when viewed in a low power eyepiece, together with the nearby HIP 22647 and another very loose visual pair, HIP 22776 and HIP 22744, all above magnitude 8. 2 Aurigae is moving closer to the Earth with a heliocentric radial velocity of −17 km/s.[4]
The visible component is an aging giant star with a stellar classification of K3- III Ba0.4.[3] The suffix notation indicates this is a mild barium star, which means the stellar atmosphere is enriched with s-process elements. It is either a member of a close binary system and has previously acquired these elements from a (now) white dwarf companion or else it is on the asymptotic giant branch and is generating the elements itself.[8] 2 Aurigae is 1.80[5] billion years old with 2.86[5] times the mass of the Sun and has expanded to 48[1] times the Sun's radius. It is radiating 599[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,115 K.[1]
References
External links
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