Rho Octantis

Not to be confused with R Octantis.
ρ Octantis
Location of ρ Octantis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Octans
Right ascension 15h 43m 16.927s[1]
Declination −84° 27′ 54.99″[1]
Apparent magnitude (V) 5.57±0.01[2]
Characteristics
Spectral type A1/2 V[3]
U−B color index +0.08[4]
B−V color index +0.11[4]
Astrometry
Radial velocity (Rv)−11±10[5] km/s
Proper motion (μ) RA: +131.101[1] mas/yr
Dec.: +96.007[1] mas/yr
Parallax (π)15.1565 ± 0.0796 mas[1]
Distance215 ± 1 ly
(66.0 ± 0.3 pc)
Absolute magnitude (MV)+1.47[6]
Details
Mass1.99[7] M☉
Radius2.19±0.07[8] R☉
Luminosity21±1[8] L☉
Surface gravity (log g)4.06±0.14[9] cgs
Temperature8,881±302[9] K
Rotational velocity (v sin i)128[10] km/s
Age431[7] Myr
Other designations
ρ Octantis, 24 G. Octantis, CPD–84 510, HD 13733, HIP 76996, HR 5729, SAO 258731, WDS J15433-8428A
Database references
SIMBADdata

Rho Octantis, Latinized from ρ Octantis, is a star located in the southern circumpolar constellation Octans. With an apparent magnitude of 5.57,[2] its faintly visible to the naked eye under ideal conditions. The star is located 215 light years away from the Solar System,[1] but is drifting closer with a radial velocity of −11 km/s.[5]

Rho Octantis has a classification of A1/2 V, which states its a star with the traits of an A1 and A2 main-sequence star. It has nearly twice the mass of the Sun,[7] and has a radius of 2.19 solar radii.[8] The star radiates at a luminosity 21 times greater than the Sun from its photosphere[8] at an effective temperature of 8,881 K,[9] which gives it a white hue. Like many A-type stars, Rho Octantis rotates rapidly, with a projected rotational velocity of 128 km/s;[10] it is 431 million years old.[7] Rho Octantis has a common proper motion K0 companion 65.7” away.[11]

  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 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 Kharch2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Bressan2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference TIC was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Glebocki2005 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).