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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 45.7 astronomical units (6.84×10 km; 4.25×10 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

1. ^ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
2. ^ Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
3. ^ Soubiran, C.; et al. (April 2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics. 552: 11. arXiv:1302.1905. Bibcode:2013A&A...552A..64S. doi:10.1051/0004-6361/201220927. S2CID 56094559. A64.
4. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
6. ^ Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv:1606.01134, Bibcode:2016ApJS..225...15C, doi:10.3847/0067-0049/225/1/15, S2CID 118438871, 15.
7. Andretta, Vincenzo; Giampapa, Mark S.; Covino, Elvira; Reiners, Ansgar; Beeck, Benjamin (2017), "ESTIMATES OF ACTIVE REGION AREA COVERAGE THROUGH SIMULTANEOUS MEASUREMENTS OF HE I λλ 5876 AND 10830 LINES", The Astrophysical Journal, 839 (2): 97, arXiv:1703.10060, Bibcode:2017ApJ...839...97A, doi:10.3847/1538-4357/aa6a14, S2CID 119201107
8. Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics, 551: 4, arXiv:1301.5651, Bibcode:2013A&A...551L...8P, doi:10.1051/0004-6361/201220364, S2CID 56420519, L8.
9. "HD 5133". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-01.
10. Bakos, Gáspár Á.; et al. (July 2002), "Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog", The Astrophysical Journal Supplement Series, 141 (1): 187–193, arXiv:astro-ph/0202164, Bibcode:2002ApJS..141..187B, doi:10.1086/340115, S2CID 36667868.
11. Eiroa, C.; et al. (July 2013). "DUst around NEarby Stars. The survey observational results". Astronomy & Astrophysics. 555: A11. arXiv:1305.0155. Bibcode:2013A&A...555A..11E. doi:10.1051/0004-6361/201321050. S2CID 377244.
12. Gáspár, András; Rieke, George H. (2014). "THE HERSCHEL COLD DEBRIS DISKS: CONFUSION WITH THE EXTRAGALACTIC BACKGROUND AT 160 μm". The Astrophysical Journal. 784 (1): 33. arXiv:1308.1954. Bibcode:2014ApJ...784...33G. doi:10.1088/0004-637X/784/1/33. Archived from the original on 2022-08-06. Retrieved 2020-10-16.
13. Su, Kate Y L.; Kennedy, Grant M.; Yelverton, Ben (2020), "No significant correlation between radial velocity planet presence and debris disc properties", Monthly Notices of the Royal Astronomical Society, 495 (2): 1943–1957, arXiv:2005.03573, doi:10.1093/mnras/staa1316, S2CID 218538179

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.

v t e Constellation of Sculptor
List of stars in Sculptor Sculptor in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η θ ι κ κ λ λ μ ξ π σ τ Variable R BW HD 4113 4208 (Cocibolca) 9578 Other Gliese 1 Gliese 42 HE 2359-2844 LTT 9779 TOI-178 WASP-8 WASP-45 WD 0137−349
Exoplanets HD 4113 b HD 4208 b TOI-178c WASP-8b
Star clusters Blanco 1 NGC 288
Galaxies	NGC 7 10 24 55 101 115 131 134 148 150 174 254 264 289 300 314 334 365 378 409 415 418 423 424 427 438 439 441 461 491 526 527 544 549 612 613 626 630 7793 7812 Other 2MASX J00482185−2507365 occulting pair A2744 YD4 Abell 2744 Y1 Cartwheel Galaxy Comet Galaxy ESO 540-030 H2356-309 Haro 11 IC 5332 Sculptor Galaxy Sculptor Dwarf Galaxy Sculptor Dwarf Irregular Galaxy UNCOVER-z12 UNCOVER-z13
Galaxy clusters Abell 2667 Abell 2744
Astronomical events SN 2009gj
Category

• K-type main-sequence stars
• Solar-type stars
• Gliese and GJ objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Durchmusterung objects
• 2MASS objects
• Sculptor (constellation)