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HD 170773

HD 170773
Location of HD 170773 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 33m 00.91673s[1]
Declination −39° 53′ 31.2751″[1]
Apparent magnitude (V) 6.22±0.01[2]
Characteristics
Spectral type F5 V[3][4]
B−V color index +0.42[5]
Astrometry
Radial velocity (Rv)−25.2±1.0[6] km/s
Proper motion (μ) RA: +86.353 mas/yr[1]
Dec.: −79.927 mas/yr[1]
Parallax (π)27.0749 ± 0.03 mas[1]
Distance120.5 ± 0.1 ly
(36.93 ± 0.04 pc)
Absolute magnitude (MV)+3.38[7]
Details
Mass1.30[8] M☉
Radius1.43±0.07[9] R☉
Luminosity3.62±0.01[1] L☉
Surface gravity (log g)4.21±0.04[10] cgs
Temperature6,694±126[11] K
Metallicity [Fe/H]−0.02±0.04[12] dex
Rotational velocity (v sin i)67.2±6.2[13] km/s
Age1.50+1.2
−0.7[10] Gyr
Other designations
14 G. Coronae Australis[14], CD−39°12704, CPD−39°8118, FK5 3470, GC 25304, HD 170773, HIP 90936, HR 6948, SAO 210286, TIC 313723578
Database references
SIMBADdata

HD 170773 (HR 6948; 14 G. Coronae Australis) is a solitary star located in the southern constellation Corona Australis. It has an apparent magnitude of 6.22,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively close at a distance of 120 light-years based on Gaia DR3 parallax measurements[1] and it is drifting closer with a heliocentric radial velocity of −25.2 km/s.[6] At its current distance, HD 170773's brightness is diminished by an interstellar extinction of 0.19 magnitudes[15] and it has an absolute magnitude of +3.38.[7]

HD 170773 has a stellar classification of F5 V,[3][4] indicating that it is an ordinary F-type main-sequence star that is generating energy via hydrogen fusion at its core. It has also been given a classification of F5 IV, indicating that it is a slightly evolved subgiant that is ceasing hydrogen fusion at its core. It has 1.30 times the mass of the Sun[8] and 1.43 times the radius of the Sun.[9] It radiates 3.62 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 6,694 K,[11] giving it the typical yellowish-white hue of a F-type star. HD 170773 has a near solar metallicity of [Fe/H] = −0.02[12] and it is estimated to be 1.5 billion years old.[10] It spins fairly quickly with a projected rotational velocity of 67.2 km/s.[13]

The star has a debris disk located 78 AU away and it has a temperature of 43 K.[16] It was first observed in 1986 by astronomers K. Sakadane and M. Nishida in their survey of Vega-like stars due to the star displaying an infrared excess that could suggest the presence of a circumstellar disk.[17] However, the actual disk was not discovered until 2004 using the Spitzer Space Telescope.[18] There might be a second cooler disk surrounding the star, but subsequent observations have not confirmed this.[16]

  1. ^ a b c d e f g 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 Houk1982 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Corben1966 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 Cite error: The named reference David2015 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. ^ a b c Cite error: The named reference Sepulveda2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Netopil2017 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  16. ^ a b Cite error: The named reference Moor2011 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Sadakane1986 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Zuckerman2004 was invoked but never defined (see the help page).

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