Pi2 Octantis

For other stars with this Bayer designation, see π Octantis.
π2 Octantis
Location of π2 Octantis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 15h 04m 46.9232s[1]
Declination −83° 02′ 17.920″[1]
Apparent magnitude (V) 5.64 ± 0.01[2]
Characteristics
Spectral type G8 Ib[3]
U−B color index +1.15[4]
B−V color index +1.3[4]
Astrometry
Radial velocity (Rv)−13.8 ± 0.3[5] km/s
Proper motion (μ) RA: −8.312[1] mas/yr
Dec.: −17.597[1] mas/yr
Parallax (π)2.0741 ± 0.0429 mas[1]
Distance1,570 ± 30 ly
(482 ± 10 pc)
Absolute magnitude (MV)−3.19[6]
Details
Mass7 ± 1[7] M☉
Radius69.02+1.61
−1.53[8] R☉
Luminosity2,709[9] L☉
Temperature4,588[9] K
Rotational velocity (v sin i)5.7 ± 1.8[10] km/s
Age43 ± 3[7] Myr
Other designations
π2 Oct, 22 G. Octantis, CPD−82°636, GC 20145, HD 131246, HIP 73771, HR 5545, SAO 258714
Database references
SIMBADdata

Pi2 Octantis, Latinized from π2 Octantis, is a solitary[11] star situated in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.64, allowing it to be faintly visible to the naked eye under ideal conditions. Located 1,570 light years away,[1] the star is approaching the Sun with a heliocentric radial velocity of −13.8 km/s.[5]

This object is an ageing late G-type supergiant that has 7 times the mass of the Sun[7] and 69.02 times the radius of the Sun.[8] It radiates at 2,709 L☉ from its enlarged photosphere at an effective temperature of 4,588 K,[9] giving it an orange-yellow glow. Despite its advanced state, Pi2 Octantis is still a young star at an age of 43 million years.[7] It spins modestly with a projected rotational velocity of 5.7 km/s.[10]

  1. ^ a b c d e f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 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 d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference DeMederios2002 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggelton2008 was invoked but never defined (see the help page).