Mu2 Scorpii

For other star systems with a similar Bayer designation, see Mu Scorpii.
μ2 Scorpii
(Pipirima)
Location of μ2 Scorpii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 52m 20.14532s[1]
Declination −38° 01′ 03.1258″[1]
Apparent magnitude (V) +3.56[2]
Characteristics
Spectral type B2 IV[3]
U−B color index −0.878[2]
B−V color index −0.219[2]
Astrometry
Radial velocity (Rv)+1.4[4] km/s
Proper motion (μ) RA: −11.09[1] mas/yr
Dec.: −23.32[1] mas/yr
Parallax (π)6.88 ± 0.12 mas[1]
Distance474 ± 8 ly
(145 ± 3 pc)
Absolute magnitude (MV)−2.25[5]
Details
Mass8.7±0.2[6] M☉
Radius7.0[7] R☉
Luminosity2,385[8] L☉
Temperature23,113[7] K
Rotational velocity (v sin i)58[9] km/s
Age18.5±3.2[6] Myr
Other designations
Pipirima, μ2 Scorpii, CD−37° 11037, HD 151985, HIP 82545, HR 6252, SAO 208116.[10]
Database references
SIMBADdata

Mu2 Scorpii (μ2 Scorpii, abbreviated Mu2 Sco, μ2 Sco), also named Pipirima /pɪˈpɪrɪmə/,[11] is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of +3.56,[2] which is bright enough to be seen with the naked eye. Its distance from the Sun is about 474 light-years, as determined by parallax measurements.[1] It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association.[12]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Gutierrez-Moreno1968 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Hiltner1969 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Underhill1979 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Uesugi1970 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
  12. ^ Cite error: The named reference Bobylev2007 was invoked but never defined (see the help page).