Pi Arietis

π Arietis
Location of π Arietis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 49m 17.55924s[1]
Declination +17° 27′ 51.5168″[1]
Apparent magnitude (V) 5.21[2]
Characteristics
Spectral type B6 V + A0 V + F8 V[3]
U−B color index –0.47[2]
B−V color index –0.06[2]
Astrometry
Radial velocity (Rv)+8.8[4] km/s
Proper motion (μ) RA: +2.60[1] mas/yr
Dec.: –14.10[1] mas/yr
Parallax (π)4.18 ± 0.69 mas[1]
Distanceapprox. 800 ly
(approx. 240 pc)
Absolute magnitude (MV)−1.56[5]
Details
Luminosity538[5] L☉
Rotational velocity (v sin i)70[6] km/s
Other designations
π Ari, 42 Arietis, BD+16° 355, HD 17543, HIP 13165, HR 836, SAO 93127.[7]
Database references
SIMBADdata

Pi Arietis, Latinized from π Arietis, is the Bayer designation for a multiple star system in the northern constellation of Aries. Based upon parallax measurements made during the Hipparcos mission, this system is approximately 800 light-years (250 parsecs) distant from Earth and has an apparent visual magnitude of 5.21. This is bright enough to be faintly seen with the naked eye.

The primary member of this system is a massive, B-type main sequence star with a stellar classification of B6 V. It is a close spectroscopic binary with an orbital period of 3.854 days, an eccentricity of 0.04, and a combined visual magnitude of 5.30. At an angular separation of 3.28 arcseconds is a magnitude 8.46 A-type main sequence star with a classification of A0 Vp. Finally, a fourth member of the system is a magnitude 11.0 F-type main sequence star with a classification of F8V at an angular separation of 25.2 arcseconds from the primary.[3]

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference aj76_1058 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. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference apj573_1_359 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).