24 Persei


24 Persei is a star in the northern constellation of Perseus, located around 337 light years from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.94.[2] The object is moving closer to the Earth with a heliocentric radial velocity of −37 km/s.[5]

24 Persei
Perseus constellation map.svg
Red circle.svg
Location of 24 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 02h 59m 03.67639s[1]
Declination 35° 10′ 59.2865″[1]
Apparent magnitude (V) 4.94[2]
Spectral type K2III[3]
U−B color index +1.28[4]
B−V color index +1.25[4]
Radial velocity (Rv)−36.97[5] km/s
Proper motion (μ) RA: −45.920[1] mas/yr
Dec.: +5.632[1] mas/yr
Parallax (π)9.6661 ± 0.1963 mas[1]
Distance337 ± 7 ly
(103 ± 2 pc)
Absolute magnitude (MV)-0.32[2]
Mass1.59 M
Radius23.56 R
Luminosity185 L
Surface gravity (log g)1.91 cgs
Temperature4,391 K
Metallicity [Fe/H]−0.07 dex
Rotational velocity (v sin i)< 1.9[7] km/s
Other designations
24 Per, BD+34°550, FK5 1082, GC 3575, HD 18449, HIP 13905, HR 882, SAO 56052[8]
Database references

This is an aging giant star with a stellar classification of K2 III,[3] which indicates it has exhausted the hydrogen at its core and evolved away from the main sequence. It has 1.59 times the mass of the Sun and has expanded to about 24 times the Sun's radius. The star is radiating 185 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,391 K.[6]


  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
  3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. ^ a b Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
  6. ^ a b Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. S2CID 59334290. Vizier catalog entry
  7. ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv:astro-ph/0608248. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
  8. ^ "24 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-29.