47 Capricorni is a variable star located around 1,170[2] light years from the Sun in the southern constellation Capricornus,[7] near the northern border with Aquarius. It has the variable star designation of AG Capricorni and a Bayer designation of c2 Capricorni;[8] 47 Capricorni is the Flamsteed designation. This object is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude that varies between 5.90 and 6.14. The star is receding from the Earth with a heliocentric radial velocity of +20 km/s.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 46m 16.26887s[2] |
| Declination | −09° 16′ 33.3799″[2] |
| Apparent magnitude (V) | 6.00[3] (5.90 - 6.14)[4] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | M2III[5] |
| B−V color index | 1.629±0.010[3] |
| Variable type | SRb[4] |
| Astrometry | |
| Radial velocity (Rv) | +19.80±0.89[6] km/s |
| Proper motion (μ) | RA: +18.731[2] mas/yr Dec.: +8.387[2] mas/yr |
| Parallax (π) | 2.7933 ± 0.2052 mas[2] |
| Distance | 1,170 ± 90 ly (360 ± 30 pc) |
| Absolute magnitude (MV) | −1.76[3] |
| Details | |
| Radius | 102+11 −10[2] R☉ |
| Luminosity | 1,940±162[2] L☉ |
| Temperature | 3,784+188 −186[2] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging red giant star with a stellar classification of M2III.[5] It is a semiregular variable star of subtype SRb with a period of 30.592 days and a maximum brightness of 5.9 magnitude.[4] With the supply of hydrogen at its core exhausted, the star has expanded to around 102[2] times the Sun's radius. It is radiating 1,940[2] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,784 K.[2]
References
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