HD 170642
HD 170642, also designated as HR 6942 or rarely 13 G. Coronae Australis, is a single star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a white hued star with an apparent magnitude of 5.16. The object is located relatively close at a distance of 229 light years based on Hipparcos parallax measurements, but it is approaching the Solar System with a somewhat constrained heliocentric radial velocity of . At its current distance, HD 170642's brightness is diminished by 0.28 magnitudes due to interstellar dust. It has an absolute magnitude of +0.93.

This is an ordinary A-type main-sequence star with a stellar classification of A3 V. Other sources include broad/nebulous absorption lines due to rapid rotation. It has 2.25 times the mass of the Sun and is estimated to be 480 million years old. HD 170642 has a radius of . When combined with an effective temperature of , it radiates 32.6 times the luminosity of the Sun from its photosphere. The star is metal enriched, having an iron abundance 74% greater than the Sun's. Like many hot stars HD 170642 spins rapidly, having a projected rotational velocity of .

References

A-type main-sequence stars
Corona Australis
Coronae Australis, 13
CD-39 12696
170642
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6942