Delta Arietis

Delta Arietis
Location of δ Arietis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 03h 11m 37.76465s[1]
Declination +19° 43′ 36.0397″[1]
Apparent magnitude (V) 4.349[2]
Characteristics
Spectral type K2 III[3]
U−B color index +0.914[2]
B−V color index +1.035[2]
R−I color index 0.51
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)23.05 ± 0.20[3] km/s
Proper motion (μ) RA: +153.33[1] mas/yr
Dec.: –8.28[1] mas/yr
Parallax (π)19.22 ± 0.19 mas[1]
Distance170 ± 2 ly
(52.0 ± 0.5 pc)
Absolute magnitude (MV)+0.77[5]
Details
Mass1.91[3] M☉
Radius10.42 ± 0.97[6] R☉
Luminosity45 ± 6[6] L☉
Surface gravity (log g)2.93[6] cgs
Temperature4,810[6] K
Metallicity [Fe/H]–0.03[6] dex
Rotational velocity (v sin i)4.3[7] km/s
Other designations
Botein, Botejn, 57 Arietis, BD+19° 477, FK5 114, HD 19787, HIP 14838, HR 951, SAO 93328.[8]
Database references
SIMBADdata

Delta Arietis (δ Arietis, abbreviated Delta Ari, δ Ari), officially named Botein /ˈboʊtiːn/,[9] is a star in the northern constellation of Aries, 1.8 degrees north of the ecliptic. The apparent visual magnitude is 4.35,[2] so it is visible to the naked eye. It has an annual parallax shift of 19.22 mas;[1] corresponding to a distance of about 170 ly (52 pc) from the Sun.

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  2. ^ a b c d Cite error: The named reference mnras172_667 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference aaa454_3_943 was invoked but never defined (see the help page).
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  6. ^ a b c d e Cite error: The named reference aaa526_A100 was invoked but never defined (see the help page).
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  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.