Rho2 Sagittarii

For other stars with this Bayer designation, see ρ Sagittarii.
Rho2 Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings
Location of ρ2 Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 19h 21m 50.89574s[1]
Declination −18° 18′ 30.1996″[1]
Apparent magnitude (V) +5.87[2]
Characteristics
Spectral type K0 III[3]
B−V color index +1.06[2]
Astrometry
Radial velocity (Rv)−12.7±2.9[4] km/s
Proper motion (μ) RA: +102.72[1] mas/yr
Dec.: −93.20[1] mas/yr
Parallax (π)9.82 ± 0.40 mas[1]
Distance330 ± 10 ly
(102 ± 4 pc)
Absolute magnitude (MV)+0.80[5]
Details
Luminosity60.4[6] L☉
Temperature4,721[6] K
Other designations
ρ2 Sgr, 45 Sgr, BD−18° 5325, HD 181645, HIP 95188, HR 7344, SAO 162521[7]
Database references
SIMBADdata

Rho2 Sagittarii (ρ2 Sagittarii) is a star in the zodiac constellation of Sagittarius. With an apparent visual magnitude of +5.87,[2] it is near the lower limit of stars that can be seen with the naked eye. Based upon an annual parallax shift of 9.82 mas as seen from Earth,[1] it is located around 330 light years from the Sun.

This is an evolved K-type giant star with a stellar classification of K0 III.[3] As a result of a 1997 lunar occultation, a companion star was discovered at an angular separation of 21 mas. It appears to be an A-type main sequence star with a class of around A5. This companion was not detected during prior occultations by the Moon.[8]

  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 Cite error: The named reference Corben1968 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gontcharov2006 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 Mcdonald2012 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).
  8. ^ Cite error: The named reference Richichi1999 was invoked but never defined (see the help page).