24 Capricorni

24 Capricorni
Location of α Capricorni (red circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Capricornus
Right ascension 21h 07m 07.66733s[1]
Declination −25° 00′ 21.0790″[1]
Apparent magnitude (V) +4.49[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M1− III[4]
B−V color index 1.604±0.005[2]
Astrometry
Radial velocity (Rv)+32.1±0.8[2] km/s
Proper motion (μ) RA: −28.09[1] mas/yr
Dec.: −44.14[1] mas/yr
Parallax (π)7.15 ± 0.22 mas[1]
Distance460 ± 10 ly
(140 ± 4 pc)
Absolute magnitude (MV)−1.24[2]
Details
Radius54.06+1.88
−2.72[5] R☉
Luminosity611±41[5] L☉
Temperature3,903+102
−66[5] K
Other designations
A Capricorni[6], 24 Cap, CD−25° 15235, FK5 791, GC 29490, HD 200914, HIP 104234, HR 8080, SAO 190025, ADS 14632, CCDM J21071-2500[7]
Database references
SIMBADdata

24 Capricorni or A Capricorni is a single[8] star in the southern constellation of Capricornus. This object is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of +4.49.[2] It is approximately 460 light years from the Sun, based on parallax.[1] The star is moving further from the Earth with a heliocentric radial velocity of +32 km/s.[2]

This is an aging red giant, currently on the asymptotic giant branch,[3] with a stellar classification of M1− III;[4] a star that has exhausted the supply of hydrogen at its core and expanded to 54[5] times the Sun's radius. It is radiating 611[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,903 K.[5]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference keenan1989 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference uranometria was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).