4 Arietis

4 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aries
Right ascension 01h 48m 10.92137s[1]
Declination +16° 57′ 19.8483″[1]
Apparent magnitude (V) 5.86[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9.5 V[4]
Astrometry
Radial velocity (Rv)+5.7±1.9[5] km/s
Proper motion (μ) RA: +65.608[1] mas/yr
Dec.: −29.291[1] mas/yr
Parallax (π)11.4613 ± 0.1511 mas[1]
Distance285 ± 4 ly
(87 ± 1 pc)
Details
Mass2.83[6] or
2.48±0.02[3] M☉
Radius2.2[7] R☉
Luminosity40.4±1.9[3] L☉
Surface gravity (log g)4.47±0.14[6] cgs
Temperature10,913±371[6] K
Rotational velocity (v sin i)33[6] km/s
Age257[6] Myr
Other designations
4 Ari, BD+16°203, FK5 1050, HD 10982, HIP 8387, HR 522, SAO 92637[8]
Database references
SIMBADdata

4 Arietis is a single[9] star in the northern constellation of Aries, the ram. 4 Arietis is the Flamsteed designation. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.86.[2] The star has an annual parallax shift of 11.46±0.15 mas,[1] which is equivalent to a distance of 285 light-years (87 parsecs) from the Sun. It is moving further from the Earth with a heliocentric radial velocity of +6 km/s.[5]

This is a B-type main sequence star with a stellar classification of B9.5 V.[4] It is 257[6] million years old and is spinning with a projected rotational velocity of 33[6] km/s. The star has more than double the mass of the Sun and around 2.2[7] times the Sun's radius. It is radiating 40[3] times the Sun's luminosity from its photosphere at an effective temperature of 10,913 K.[6]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference aaass52_131 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference PasinettiFracassini2001 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 Eggleton2008 was invoked but never defined (see the help page).