• Source: Gliese 42

Gliese 42 is a star in the southern constellation of Sculptor. It is too faint to be seen with the naked eye, having an apparent visual magnitude of +7.3. The annual parallax shift of 70.56 mas provides a distance estimate of 46 light years. It has a relatively high proper motion, advancing 0.62 arcseconds across the sky per annum, and is moving closer to the Sun with a radial velocity of −13 km/s.
The spectrum of the star matches a stellar classification of K2.5 V (k), indicating it is an ordinary K-type main-sequence star that is generating energy through hydrogen fusion at its core. It is radiating 29% of the Sun's luminosity from its photosphere at an effective temperature of 4,822 K. The star has 66% of the Sun's radius.




Debris disk


An infrared excess has been detected around this star, most likely indicating the presence of a circumstellar disk at a radius of 45.7 astronomical units (6.84×109 km; 4.25×109 mi). The temperature of this dust was initially estimated as 30 K (−243.2 °C; −405.7 °F) according to measurement by Herschel Space Observatory. Later that measurement was deemed questionable, and fixed temperature of 62 K (−211.2 °C; −348.1 °F) was obtained in 2020.




References






External links


University of Heidelberg, The. "ARICNS ARI Data Base for Nearby Stars". Archived from the original on 28 September 2012. Retrieved 8 May 2012.
University of Strasbourg, The. "SIMBAD star database". Archived from the original on 2 October 2018. Retrieved 8 May 2012.
University of Hamburg, The. "NEXXUS 2 - The database for Nearby X-ray and extreme UV emitting Stars". Archived from the original on 4 March 2016. Retrieved 8 May 2012.
Sol Stations, The. "K stars within 100 light-years". Archived from the original on 24 December 2017. Retrieved 8 May 2012.

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