56 Sagittarii

56 Sagittarii
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 19h 46m 21.73912s[1]
Declination −19° 45′ 40.0132″[1]
Apparent magnitude (V) 4.87[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K0+III[4]
U−B color index +0.96[5]
B−V color index +1.06[5]
Astrometry
Radial velocity (Rv)+22.07[6] km/s
Proper motion (μ) RA: −129.40[1] mas/yr
Dec.: −90.55[1] mas/yr
Parallax (π)15.71 ± 0.23 mas[1]
Distance208 ± 3 ly
(63.7 ± 0.9 pc)
Absolute magnitude (MV)0.85[2]
Details
Mass1.77[7] M☉
Radius11[6] R☉
Luminosity58.97[2] L☉
Surface gravity (log g)2.58[8] cgs
Temperature4,750[9] K
Metallicity [Fe/H]−0.07[8] dex
Rotational velocity (v sin i)1.9[6] km/s
Other designations
f Sgr, 56 Sgr, BD−20°5698, GC 27349, HD 186648, HIP 97290, HR 7515, SAO 162964, GSC 06320-02845[10]
Database references
SIMBADdata

56 Sagittarii is a single[11] star in the southern constellation of Sagittarius. It has the Bayer designation f Sagittarii, while 56 Sagittarii is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.87.[2] It is located approximately 208 light years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22 km/s.[6]

This is an aging giant star with a stellar classification of K0+III,[4] having exhausted the supply of hydrogen at its core and expanded to 11[6] times the Sun's radius. It is a red clump giant,[3] which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 1.8[7] times the mass of the Sun and is radiating 59[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,750 K.[9]

  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 e Cite error: The named reference XHIP was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference MermiliodUBV was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Wu2011 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gontcharov2008 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. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).