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] |
Distance | 120.5 ± 0.1 ly (36.93 ± 0.04 pc) |
Absolute magnitude (MV) | +3.38[7] |
Details | |
Mass | 1.30[8] M☉ |
Radius | 1.43±0.07[9] R☉ |
Luminosity | 3.62±0.01[1] L☉ |
Surface gravity (log g) | 4.21±0.04[10] cgs |
Temperature | 6,694±126[11] K |
Metallicity [Fe/H] | −0.02±0.04[12] dex |
Rotational velocity (v sin i) | 67.2±6.2[13] km/s |
Age | 1.50+1.2 −0.7[10] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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]
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