19 Arietis

19 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 13m 03.30440s[1]
Declination +15° 16′ 47.5005″[1]
Apparent magnitude (V) 5.70[2]
Characteristics
Spectral type M0 III[3]
U−B color index +1.95[2]
B−V color index +1.55[2]
R−I color index 0.97
Variable type Semiregular[4]
Astrometry
Radial velocity (Rv)21.11 ± 0.26[5] km/s
Proper motion (μ) RA: +97.95[1] mas/yr
Dec.: -20.30[1] mas/yr
Parallax (π)6.81 ± 0.38 mas[1]
Distance480 ± 30 ly
(147 ± 8 pc)
Details
Radius39.36[6] R☉
Luminosity301.969[6] L☉
Temperature3838±125[6] K
Metallicity [Fe/H]–0.02 ± 0.11[7] dex
Other designations
BD+14 357, FK5 1057, HD 13596, HIP 10328, HR 648, SAO 92841.[8]
Database references
SIMBADdata

19 Arietis (abbreviated 19 Ari) is a star in the northern constellation of Aries. 19 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 5.70,[2] which means it is faintly visible to the naked eye. Based upon an annual parallax shift of 6.81 mas,[1] it is approximately 480 light-years (150 parsecs) away from Earth. At that distance, the brightness of the star is diminished by 0.21 in magnitude from extinction caused by interstellar gas and dust.[5]

This is a red giant star with a stellar classification of M0 III.[3] It is a semi-regular variable with periods of 32 and 275 days; the brightness of the star changes by an amplitude of 0.14 in magnitude during those intervals.[4] 19 Arietis has expanded to 39 times the size of the Sun, its photosphere radiates 300 times the luminosity of the Sun.[6] The effective temperature of the outer envelope is 3,838 K,[6] giving it the cool reddish glow of an M-type star.[9]

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  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference mnras355_2_601 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference aaa430_165 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference tycho-gaia was invoked but never defined (see the help page).
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  9. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).