Gliese 42

Short description: Star in the constellation of Sculptor

Gliese 42  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Sculptor
Right ascension |  00h 53m 00.71555s[1]
Declination | −30° 21′ 25.1677″[1]
Apparent magnitude (V) | +7.3029[1]
Characteristics
Spectral type | K2.5 V (k)[2]
B−V color index | 0.936[1]
Astrometry
Radial velocity (Rv)| −13.021±0.0064[3] km/s
Proper motion (μ)|  RA: +620.35[1] mas/yr
Dec.: +30.26[1] mas/yr
Parallax (π)| 71.5472 ± 0.0573[4] mas
Distance| 45.59 ± 0.04 ly
(13.98 ± 0.01 pc)
Absolute magnitude (MV)| +6.39[5]
Details
Radius| 0.660[6] R☉
Luminosity| 0.29[5] L☉
Surface gravity (log g)| 4.55[2] cgs
Temperature| 4,822[2] K
Metallicity [Fe/H]| −0.21[2] dex
Rotational velocity (v sin i)| 1.8[7] km/s
Age| 6.67±4.74[8] Gyr
Other designations

BD−31° 325, Gaia DR2 5031808453624044800, GJ 42, HD 5133, HIP 4148, SAO 192793, LTT 498, 2MASS J00530108-3021249[9]

Database references
SIMBAD| data

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.[1] 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[10] arcseconds across the sky per annum, and is moving closer to the Sun with a radial velocity of −13 km/s.[3]

The spectrum of the star matches a stellar classification of K2.5 V (k),[2] indicating it is an ordinary K-type main-sequence star that is generating energy through hydrogen fusion at its core. It is radiating 29%[5] of the Sun's luminosity from its photosphere at an effective temperature of 4,822 K.[2] The star has 66%[6] of the Sun's radius.

## Debris disk

An infrared excess has been detected around this star,[11] most likely indicating the presence of a circumstellar disk at a radius of 45.7 Astronomy:astronomical unit|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)[6] according to measurement by Herschel Space Observatory. Later that measurement was deemed questionable,[12] and fixed temperature of 62 K (−211.2 °C; −348.1 °F) was obtained in 2020.[13]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
3. ↑ 3.0 3.1 Soubiran, C. et al. (April 2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics 552: 11. doi:10.1051/0004-6361/201220927. A64. Bibcode: 2013A&A...552A..64S.
4. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
5. ↑ 5.0 5.1 5.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
6. ↑ 6.0 6.1 6.2 Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series 225 (1): 24, doi:10.3847/0067-0049/225/1/15, 15, Bibcode: 2016ApJS..225...15C.
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, doi:10.3847/1538-4357/aa6a14, Bibcode: 2017ApJ...839...97A
8. ↑ Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics 551: 4, doi:10.1051/0004-6361/201220364, L8, Bibcode: 2013A&A...551L...8P.
9. ↑ "HD 5133". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+5133.
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, doi:10.1086/340115, Bibcode: 2002ApJS..141..187B.
11. ↑ Eiroa, C. et al. (July 2013). "DUst around NEarby Stars. The survey observational results". Astronomy & Astrophysics 555: A11. doi:10.1051/0004-6361/201321050. Bibcode: 2013A&A...555A..11E.
12. ↑ THE HERSCHEL COLD DEBRIS DISKS: CONFUSION WITH THE EXTRAGALACTIC BACKGROUND AT 160 μm
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, doi:10.1093/mnras/staa1316

## External links

* University of Heidelberg, The. "ARICNS ARI Data Base for Nearby Stars.". http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00078.htm. Retrieved 8 May 2012.
* University of Strasbourg, The. "SIMBAD star database.". http://cdsbib.u-strasbg.fr/cgi-bin/bibobj?2001A&A...373.1019S;&HD+5133+. Retrieved 8 May 2012.
* University of Hamburg, The. "NEXXUS 2 - The database for Nearby X-ray and extreme UV emitting Stars.". http://www.hs.uni-hamburg.de/DE/For/Gal/Xgroup/nexxus/nstarpage.cgi?identifier=0139. Retrieved 8 May 2012.
* Sol Stations, The. "K stars within 100 light-years.". http://www.solstation.com/stars3/100-ks.htm. Retrieved 8 May 2012.

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Constellation of Sculptor

* List of stars in Sculptor
* Sculptor in Chinese astronomy

Stars|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ1
* κ2
* λ1
* λ2
* μ
* ξ
* π
* σ
* τ

|

Variable|

* R
* S
* Z
* RT
* SY
* VY
* VZ
* AI
* AL
* AP
* AU
* AV
* AW
* BB
* BU
* BW
* BX

HR|

* 13
* 42
* 43
* 54
* 57
* 102
* 138
* 268
* 300
* 400
* 436
* 441
* 445
* 453
* 471
* 494
* 498
* 8802
* 8813
* 8871
* 8883
* 8914
* 8999
* 9026
* 9044
* 9058
* 9102

HD|

* 3074
* 3605
* 4113
* 4208
* 6403
* 9151
* 9578
* 219580
* 219823

Other|

* CD -38 245
* GD 659
* GJ 2005
* Gliese 1
* HE 2359-2844
* WASP-8
* WASP-45
* WD 0137−349

| Exoplanets|

* HD 4113 b
* HD 4208 b
* HD 9578 b
* WASP-8 b

|

| 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
* 612
* 613
* 630
* 7793
* 7812

|

Other|

* A2744 YD4
* Abell 2744 Y1
* Cartwheel Galaxy
* Comet Galaxy
* ESO 540-030
* Haro 11
* Sculptor Galaxy
* Sculptor Dwarf Galaxy
* Sculptor Dwarf Irregular Galaxy

| Galaxy clusters|

* Abell 2667
* Abell 2744

|

| Astronomical events|

* SN 2009gj

|

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