HD 12139
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.89[1] |
| Characteristics | |
| Spectral type | K0III-IV[3] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[2] km/s |
| Proper motion (μ) | RA: +141.014[2] mas/yr Dec.: -14.643[2] mas/yr |
| Parallax (π) | 9.3049±0.0967 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.50[1] |
| Details | |
| Mass | Script error: No such module "val".[4] Template:Solar mass |
| Radius | Script error: No such module "val".[2] Template:Solar radius |
| Luminosity | Script error: No such module "val".[2] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[4] cgs |
| Temperature | Script error: No such module "val".[2] K |
| Metallicity [Fe/H] | Script error: No such module "val".[4] dex |
| Age | Script error: No such module "val".[4] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[5] | |
| Database references | |
| SIMBAD | data |
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HD 12139 is an orange-hued star in the northern zodiac constellation of Aries. With an apparent visual magnitude of 5.89, it is a dim star that is just visible to the naked eye under good viewing conditions. It is located approximately Script error: No such module "convert". distant from the Sun, based on parallax,[1] but is drifting closer with a radial velocity of −2 km/s.[2] With high probability, it is considered a member of the Hercules stream.[6]
This object is an aging red giant[7] with a stellar classification of K0III-IV,[3] meaning that it has used up its core hydrogen and is expanding. At present it has 11[2] times the girth of the Sun. The star is about two[4] billion years old with 1.7[4] times the mass of the Sun. It is radiating 58[2] times the luminosity of the Sun from its photosphere at an effective temperature of 4,780 K.[2]
A magnitude 9.36 companion is located at an angular separation of Script error: No such module "val". from the primary along a position angle of 9°, as of 2015. It is unclear if the two are physically associated.[8]
References
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- ↑ a b c d e Template:Cite XHIP
- ↑ a b c d e f g h i j k l m Template:Cite Gaia DR2
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c d e f Script error: No such module "Citation/CS1".
- ↑ Template:Cite simbad
- ↑ 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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