54 Arietis

54 Arietis is a star in the northern zodiac constellation of Aries. 54 Arietis is the Flamsteed designation. It is a challenge to view with the naked eye even under good viewing conditions, having an apparent visual magnitude of 6.27.[2] Based upon an annual parallax shift of 4.39 mas, it is located approximately 740 light-years (230 parsecs) distant from Earth, and it is drifting further away with a radial velocity of +44 km/s.[1] The brightness of the star is diminished by 0.15[7] in magnitude from extinction caused by interstellar gas and dust. The star is positioned near the ecliptic and thus is subject to lunar occultations.[8]

54 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  03h 08m 21.10890s[1]
Declination +18° 47′ 42.1886″[1]
Apparent magnitude (V) 6.27[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M0 III[4]
B−V color index 1.560±0.014[5]
Astrometry
Radial velocity (Rv)+44.32±0.22[1] km/s
Proper motion (μ) RA: +38.133[1] mas/yr
Dec.: −14.295[1] mas/yr
Parallax (π)4.3947 ± 0.1037[1] mas
Distance740 ± 20 ly
(228 ± 5 pc)
Absolute magnitude (MV)−0.54[5]
Details
Radius40.7+3.0
−2.6[1] R☉
Luminosity387±11[1] L☉
Temperature4013+137
−141[1] K
Other designations
54 Ari, BD+18°414, FK5 4285, GC 3742, HD 19460, HIP 14586, HR 940, SAO 93293[6]
Database references
SIMBADdata

This is an aging red giant star with a stellar classification of M0 III[4] that is currently evolving along the asymptotic giant branch.[3] Having exhausted the supply of hydrogen at its core, the star has expanded to 41[1] times the Sun's radius. It varies slightly in brightness, with a periodicity of 6.2 days and an amplitude change of 0.0096 in magnitude.[4] On average it is radiating 387[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,013 K.[1]

References
  1. 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. Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133: 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
  3. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  4. Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.
  5. 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.
  6. "54 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-31.
  7. Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272.
  8. Eitter, J. J.; Beavers, W. I. (June 1979), "Lunar occultation summary. III", Astrophysical Journal Supplement Series, 40: 475–486, Bibcode:1979ApJS...40..475E, doi:10.1086/190595. See event #419 for example.
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