| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 28m 43.40070s[1] |
| Declination | −21° 48′ 25.8504″[1] |
| Apparent magnitude (V) | +4.50[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | G7IIIb Fe–1[4] |
| B−Vcolor index | 0.889[1] |
| Astrometry | |
| Radial velocity (Rv) | −20.8±0.9[5] km/s |
| Proper motion (μ) | RA: +134.83mas/yr[1] Dec.: −5.73mas/yr[1] |
| Parallax (π) | 19.06±0.29 mas[1] |
| Distance | 171 ± 3 ly (52.5 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.811[6] |
| Details[3] | |
| Mass | 2.26±0.19 M☉ |
| Radius | 8.59±0.07 R☉ |
| Luminosity | 43.15±0.69 L☉ |
| Surface gravity (log g) | 2.96±0.10 cgs |
| Temperature | 5,047±5 K |
| Metallicity[Fe/H] | −0.01±0.10 dex |
| Age | 770±170 Myr |
| Other designations | |
| b Cap,36 Cap,BD−22°5692,HD 204381,HIP 106039,HR 8213,SAO 190374[7] | |
| Database references | |
| SIMBAD | data |
36 Capricorni is a single,[8] yellow-huedstar in the southernconstellation ofCapricornus. It is visible to the naked eye with anapparent visual magnitude of +4.50.[2] The distance to this star, as determined from an annualparallax shift of19.06±0.29 mas,[1] is around 171 light years. It is currently moving closer with a heliocentricradial velocity of −21 km/s, and will come within 145 ly (44.58 pc) in about 685,000 years ago.[5]
This is anevolvedG-typegiant star with astellar classification of G7IIIb Fe–1,[4] where the suffix notation indicates an underabundance of iron found in thespectrum. At the age of 770 million years it has become ared clump giant, meaning it is generating energy throughhelium fusion at itscore. It has 2.26 times themass of the Sun, but has expanded to 8.6 times itsradius. It is radiating 43 times theSun's luminosity from itsphotosphere at aneffective temperature of 5,047 K.[3]
InChinese,十二國 (Shíer Guó), meaningTwelve States, refers to an asterism which is represent twelve ancient states in theSpring and Autumn period and theWarring States period, consisting of 36 Capricorni,φ Capricorni,ι Capricorni,37 Capricorni,35 Capricorni,χ Capricorni,θ Capricorni,30 Capricorni,33 Capricorni,ζ Capricorni,19 Capricorni,26 Capricorni,27 Capricorni,20 Capricorni,η Capricorni and21 Capricorni.[9] Consequently, 36 Capricorni itself is represent the stateJin (晉)[10] (orTsin),[11] together withκ Herculis inRight Wall of Heavenly Market Enclosure (asterism)[12]
