16 Aurigae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.552[2] |
| Characteristics | |
| Spectral type | K2.5 IIIb CN-0.5[3] |
| U−B Template:Engvar | +1.26[4] |
| B−V Template:Engvar | +1.276[2] |
| Astrometry | |
| Radial velocity (Rv) | −28.44[2] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[1] mas/yr Dec.: Script error: No such module "val".[1] mas/yr |
| Parallax (π) | 14.04±0.58 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.28[5] |
| Orbit[6][7] | |
| Period (P) | Script error: No such module "val". |
| Semi-major axis (a) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Details | |
| 16 Aur A | |
| Mass | 1.30[2] Template:Solar mass |
| Radius | Script error: No such module "val".[8] Template:Solar radius |
| Luminosity | Script error: No such module "val".[8] Template:Solar luminosity |
| Surface gravity (log g) | 1.87[9] cgs |
| Temperature | Script error: No such module "val".[2] K |
| Metallicity [Fe/H] | −0.40[9] dex |
| Rotational velocity (v sin i) | 0.0[10] km/s |
| Age | 5.07[2] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[11] | |
| Database references | |
| SIMBAD | data |
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16 Aurigae is a triple star[12] system located 232 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.547,[13] and is located about 2/3 of the way from Capella toward Beta Tauri. It also lies in the midst of the Melotte 31 cluster, but is merely a line-of-sight interloper.[6] The system has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.166 arc seconds per annum,[14] and is moving closer to the Earth with a heliocentric radial velocity of −28 km/s.[2]
The primary component is a single-lined spectroscopic binary with an orbital period of Script error: No such module "convert". and an eccentricity of 0.1189.[6] The visible member is an aging K-type giant star with a stellar classification of K2.5 IIIb CN-0.5;[3] sometimes just given as K3 III. The notation of the former class indicates weak lines of CN in the spectrum.[6] This star is an estimated five[2] billion years old with 1.30[2] times the mass of the Sun. As a consequence of exhausting the hydrogen at its core, it has expanded to 20 times the Sun's radius. The star is radiating 127[8] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,264 K.[2]
A third component is an magnitude 10.6 star at an angular separation of Script error: No such module "val"..[12] It shows a common proper motion with the primary and thus is a likely third member of the system.[6]
References
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