HR 6801

HR 6801
Location of HR 6801 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 18h 11m 43.33342s[1]
Declination −23° 42′ 04.4346″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Spectral type K0III[3]
U−B color index +0.90[4]
B−V color index +1.05[4]
Astrometry
Radial velocity (Rv)+5.71±0.20[1] km/s
Proper motion (μ) RA: +9.337[1] mas/yr
Dec.: −31.999[1] mas/yr
Parallax (π)12.6303 ± 0.2449 mas[1]
Distance258 ± 5 ly
(79 ± 2 pc)
Absolute magnitude (MV)0.49[2]
Details
Mass2.24[5] M☉
Radius13.35+0.14
−0.92[1] R☉
Luminosity78.6±1.7[1] L☉
Surface gravity (log g)2.65[5] cgs
Temperature4,705+171
−25[1] K
Metallicity [Fe/H]0.00[5] dex
Rotational velocity (v sin i)1.6[6] km/s
Other designations
1 Sgr, CD–23°14047, GC 24799, HD 166464, HIP 89153, HR 6801, SAO 186437, CCDM J18117-2342A, WDS J18117-2342A[7]
Database references
SIMBADdata

HR 6801 is a single[8] star in the southern zodiac constellation of Sagittarius. It was designated as 1 Sagittarii by Flamsteed, but is now often referred to as 11 Sagittarii. Flamsteed's 11 Sgr actually refers to a different, much fainter star.[9] The object is orange in hue and is visible to the naked eye as a faint point of light with an apparent visual magnitude of 4.96.[2] The distance to this star is approximately 258 light years based on stellar parallax, and it is drifting further away with a radial velocity of +6 km/s.[1]

This is an aging giant star with a stellar classification of K0III.[10] It is a red clump giant,[11] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 2.24[5] times the mass of the Sun and has expanded to 13.4 times the Sun's radius. It is radiating 79 times the luminosity of the Sun from its photosphere at an effective temperature of 4,705 K.[1]

A faint visual companion, component B, has magnitude 11.51 and an angular separation of 43.7″.[12]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference XHIP was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference MermiliodUBV was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Liu2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference deMedeiros2014 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 Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Wagman was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Hoffleit1991 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference WDS was invoked but never defined (see the help page).