Star in the constellation of Sculptor
! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | B−V 
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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 . The temperature of this dust was initially estimated as according to measurement by Herschel Space Observatory. Later that measurement was deemed questionable, and fixed temperature of was obtained in 2020.
References.
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