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HD 169853

HD 169853
Location of HD 169853 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 28m 27.11405s[1]
Declination −38° 59′ 44.4102″[1]
Apparent magnitude (V) 5.62±0.01[2]
Characteristics
Spectral type A2m A2-F0[3] or A3 III[4]
B−V color index +0.13[5]
Astrometry
Radial velocity (Rv)−21.3±1.2[6] km/s
Proper motion (μ) RA: +0.096 mas/yr[1]
Dec.: −41.093 mas/yr[1]
Parallax (π)8.3424 ± 0.0673 mas[1]
Distance391 ± 3 ly
(119.9 ± 1.0 pc)
Absolute magnitude (MV)+0.13[7]
Details
Mass2.09+0.39
−0.25[8] M☉
Radius3.72±0.12[9] R☉
Luminosity60.7+1.0
−1.1[1] L☉
Surface gravity (log g)3.64[10] cgs
Temperature8,437±164[8] K
Metallicity [Fe/H]−0.01[11] dex
Rotational velocity (v sin i)22.6±0.3[12] km/s
Age585+67
−66[1] Myr
Other designations
9 G. Coronae Australis[13], CD−39°12626, CPD−39°8093, GC 25185, HD 169853, HIP 90541, HR 6910, SAO 210197[14]
Database references
SIMBADdata

HD 169853, also known as HR 6910 or rarely 9 G. Coronae Australis, is a solitary star[15] located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.62.[2] Gaia DR3 parallax measurements imply a distance of 391 light years,[1] and it is currently approaching the Solar System with a heliocentric radial velocity of −21.3 km/s.[6] At its current distance, HD 169853's brightness is diminished by 0.36 magnitudes due to extinction from interstellar dust[16] and it has an absolute magnitude of +0.13.[7]

HD 169853 has a stellar classification of A2mA2-F0,[3] indicating that it is an Am star with the calcium H lines of an A2 star and the metallic lines of an F0 star. Abt and Morell (1995) give a class of A3 III,[4] indicating that the object is instead an evolved A-type giant star with no chemical peculiarities. A paper published in late 1987 found that HD 169853 had an overabundance of silicon, manganese, strontium, and barium.[17]

The object has 2.09 times the mass of the Sun[8] and a slightly enlarged radius of 3.72 R☉.[9] It radiates 60.7 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 8,437 K.[8] It has a near solar metallicity at (Fe/H) = −0.01[11] and it is estimated to be 585 million years old, having completed 80% of its main sequence lifetime.[1] Like many chemically peculiar stars, HD 169853 rotates rather slowly, having a projected rotational velocity of 22.6 km/s.[12]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR3 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. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Corben1971 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Díaz2011 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Lodén1987 was invoked but never defined (see the help page).
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