15 Arietis

15 Arietis

A visual band light curve for 15 Arietis, plotted from data presented by Tabur et al. (2009)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 10m 37.59642s[2]
Declination +19° 30′ 01.2099″[2]
Apparent magnitude (V) 5.67 - 5.74[3]
Characteristics
Spectral type M3 III[1]
U−B color index +1.91[4]
B−V color index +1.64[4]
Variable type SRs[3]
Astrometry
Radial velocity (Rv)+62.04 ± 0.22[5] km/s
Proper motion (μ) RA: +87.88[2] mas/yr
Dec.: -27.82[2] mas/yr
Parallax (π)5.84 ± 0.49 mas[2]
Distance560 ± 50 ly
(170 ± 10 pc)
Absolute magnitude (MV)−0.9[6]
Details
Mass1.4[6] M☉
Radius87[6] R☉
Luminosity781[7] L☉
Temperature3,565[7] K
Other designations
AV Arietis, BD+18°277, FK5 1056, HD 13325, HIP 10155, HR 631, SAO 92822
Database references
SIMBADdata

15 Arietis (abbreviated 15 Ari) is a single[8] variable star in the northern constellation of Aries. 15 Arietis is the Flamsteed designation; it also bears the variable star designation AV Arietis. It has an apparent visual magnitude of 5.74,[8] which is just bright enough to be visible to the naked eye from dark suburban skies. An annual parallax shift of 5.84 mas[2] corresponds to a physical distance of approximately 560 light-years (170 parsecs) from Earth. At that distance, the star's brightness is reduced by 0.33[5] in magnitude because of extinction from interstellar gas and dust.

This is a red giant star with a stellar classification of M3 III.[1] The measured angular diameter of this star is 3.67 ± 0.11 mas.[9] At the estimated distance of Delta Ophiuchi,[2] this yields a physical size of about 67 times the radius of the Sun.[10] The radius determined from the observed brightness and colour of the star is 87 R☉.[6]

15 Arietis is a short period semiregular variable with the designation AV Arietis. The period given in the General Catalogue of Variable Stars is 5.032 days.[3] Longterm photometry finds that the strongest pulsation period is 18.1 days with an amplitude of 0.028 magnitudes, while a second is 21.9 days and 0.030 in magnitude.[1]

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