40 Arietis

40 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 48m 32.08864s[1]
Declination +18° 17′ 01.6491″[1]
Apparent magnitude (V) 5.82[2]
Characteristics
Spectral type K1 III[3]
U−B color index 1.13
B−V color index +1.20[2]
R−I color index 0.44
Variable type suspected[4]
Astrometry
Radial velocity (Rv)+47.1[5] km/s
Proper motion (μ) RA: +41.250[1] mas/yr
Dec.: −32.585[1] mas/yr
Parallax (π)7.3266 ± 0.1215 mas[1]
Distance445 ± 7 ly
(136 ± 2 pc)
Absolute magnitude (MV)0.09[6]
Details[7]
Mass1.60±0.48 M☉
Radius19.74+0.29
−0.96[1] R☉
Luminosity127.98±2.52[1] L☉
Surface gravity (log g)2.09±0.11 cgs
Temperature4,473±92 K
Metallicity [Fe/H]−0.21±0.05 dex
Age2.63+1.00
−0.72 Gyr
Other designations
40 Ari, NSV 937, BD+17°442, GC 3369, HD 17459, HIP 13108, HR 828, SAO 93118[8]
Database references
SIMBADdata

40 Arietis is a probable binary star[3] system in the northern constellation of Aries. 40 Arietis is the Flamsteed designation. Their combined apparent magnitude is 5.82,[2] putting the system near the limit of naked eye visibility. Based upon an annual parallax shift of just 7.33 mas,[1] it is 445 light-years (136 parsecs) away from the Sun. At that distance, its brightness is diminished by 0.21 in magnitude from extinction caused by interstellar gas and dust.[9]

This is a suspected spectroscopic binary with an angular separation of 0.2″ between the two components.[3] The visible component is an evolved giant star with a stellar classification of K1 III.[3] It is a suspected variable star of unknown type,[4] and is around 2.6 billion years old with 1.6 times the mass of the Sun.[7] With the supply of hydrogen at its core exhausted, the star has expanded to 20 times the Sun's radius.[1] It is radiating 128 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,473 K.[7]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  3. ^ a b c d 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 Samus2017 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Feuillet2016 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa430_165 was invoked but never defined (see the help page).