Gliese 42

	Gliese 42
Observationsdata; Epok: J2000.0
Stjärnbild	Bildhuggaren
Rektascension	00t 53m 00,71555 s
Deklination	-30° 21′ 25,1677″
Skenbar magnitud ()	+7,3029 (v)
Stjärntyp
Spektraltyp	K2.5 V (k)
B–V	+0,936
Astrometri
Radialhastighet ()	-13,021 ± 0,0064 km/s
Egenrörelse (µ)	RA: +620,35 mas/år; Dek.: +30,26 mas/år
Parallax ()	71,5472 ± 0,0573
Avstånd	45,59 ± 0,04 lå (13,98 ± 0,01 pc)
Absolut magnitud ()	+6,39
Detaljer
Radie	0,660 R☉
Luminositet	0,29 L☉
Temperatur	4 822 K
Metallicitet	-0,21 (Fe/H) dex
Vinkelhastighet	1,8 km/s
Ålder	6,67 ± 4,74 miljarder år
Andra beteckningar
	LHS 1163, CD-31 325, CPD-31 92, G 269-49, GJ 42.0, GJ 42, HD 5133, HIC 4148, HIP 4148, IRAS 00505-3037, 2MASS J00530108-3021249, NLTT 2941, PLX 177, PPM 276466, RAVE J005301.1-302125, SAO 192793, TYC 6998-1282-1, uvby98 100005133, WISEA J005301.69-302124.2, Gaia DR2 5031808453624044800, Gaia EDR3 5031808453624044800, Gaia DR1 5031808449327958912

Gliese 42 är en ensam stjärna i den mellersta delen av stjärnbilden Bildhuggaren. Den har en skenbar magnitud av ca 7,30^[1] och kräver åtminstone en stark handkikare för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 70,1^[4] mas, beräknas den befinna sig på ett avstånd på ca 46 ljusår (ca 14 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -13 km/s.^[3] Stjärnan har en relativt stor egenrörelse av 0,62 bågsekund per år över himlavalvet.^[11]

Egenskaper redigera

Gliese 42 är en orange till gul stjärna i huvudserien av spektralklass K2.5 V (k),^[2] Den har en radie som är ca 0,66^[6] solradier och har ca 0,29 gånger solens utstrålning av energi^[5] från dess fotosfär vid en effektiv temperatur av ca 4 800 K.^[2]

Ett överskott av infraröd strålning har observerats kring stjärnan,^[12] vilket sannolikt anger närvaro av en omkretsande stoftskiva med en radie av 45,7 astronomiska enheter (6,84×10⁹ km). Temperaturen hos detta stoft uppskattades ursprungligen till 30 K (−243,2 °C)^[6] enligt mätningar av Herschels rymdobservatorium. Senare ansågs mätningen tveksam,^[13] och 2020 fastställdes temperaturen till 62 K (−211,2 ° C).^[14]

Referenser redigera

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, Gliese 42, 1 juli 2022.

Noter redigera

^ [a b c d e f g] 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.
^ [a b c d e] 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.
^ [a b] 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.
^ [a b] 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.
^ [a b c] 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.
^ [a b c] 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.
^ 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, doi:10.3847/1538-4357/aa6a14, S2CID 119201107
^ 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.
^ HD 5133 (unistra.fr), Hämtad 2022-07-01.
^ "HD 5133". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2018-01-01.
^ 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.
^ 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.
^ THE HERSCHEL COLD DEBRIS DISKS: CONFUSION WITH THE EXTRAGALACTIC BACKGROUND AT 160 μm
^ 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

Externa länkar redigera

University of Heidelberg, The. ”ARICNS ARI Data Base for Nearby Stars.”. ARICNS ARI Data Base for Nearby Stars.. http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00078.htm. Läst 8 maj 2012.
University of Strasbourg, The. ”SIMBAD star database.”. SIMBAD star database.. http://cdsbib.u-strasbg.fr/cgi-bin/bibobj?2001A%26A...373.1019S&HD+5133+. Läst 8 maj 2012.
University of Hamburg, The. ”NEXXUS 2 - The database for Nearby X-ray and extreme UV emitting Stars.”. 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. Läst 8 maj 2012.
Sol Stations, The. ”K stars within 100 light-years.”. K stars within 100 light-years.. http://www.solstation.com/stars3/100-ks.htm. Läst 8 maj 2012.

[A-1] [a b c d e f g] 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.

[B-2] [a b c d e] 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.

[C-3] [a b] 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.

[D-4] [a b] 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.

[E-5] [a b c] 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.

[F-6] [a b c] 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.

[G-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, doi:10.3847/1538-4357/aa6a14, S2CID 119201107

[H-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.

[SIMBAD-9] HD 5133 (unistra.fr), Hämtad 2022-07-01.

[I-10] "HD 5133". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2018-01-01.

[J-11] 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.

[K-12] 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.

[L-13] THE HERSCHEL COLD DEBRIS DISKS: CONFUSION WITH THE EXTRAGALACTIC BACKGROUND AT 160 μm

[M-14] 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

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Observationsdata Epok: J2000.0
Gliese 42

Stjärnbild	Bildhuggaren
Rektascension	00^t 53^m 00,71555 ^s^[1]
Deklination	-30° 21′ 25,1677″^[1]
Skenbar magnitud ( $V$ )	+7,3029 (v)^[1]
Stjärntyp
Spektraltyp	K2.5 V (k)^[2]
B–V	+0,936^[1]
Astrometri
Radialhastighet ( $R_{v}$ )	-13,021 ± 0,0064^[3] km/s
Egenrörelse (µ)	RA: +620,35^[1] mas/år Dek.: +30,26^[1] mas/år
Parallax ( $\pi$ )	71,5472 ± 0,0573^[4]
Avstånd	45,59 ± 0,04 lå (13,98 ± 0,01 pc)
Absolut magnitud ( $M_{V}$ )	+6,39^[5]
Detaljer
Radie	0,660^[6] R_☉
Luminositet	0,29^[5] L_☉
Temperatur	4 822^[2] K
Metallicitet	-0,21 (Fe/H)^[2] dex
Vinkelhastighet	1,8^[7] km/s
Ålder	6,67 ± 4,74^[8] miljarder år
Andra beteckningar
LHS 1163, CD-31 325, CPD-31 92, G 269-49, GJ 42.0, GJ 42, HD 5133, HIC 4148, HIP 4148, IRAS 00505-3037, 2MASS J00530108-3021249, NLTT 2941, PLX 177, PPM 276466, RAVE J005301.1-302125, SAO 192793, TYC 6998-1282-1, uvby98 100005133, WISEA J005301.69-302124.2, Gaia DR2 5031808453624044800, Gaia EDR3 5031808453624044800, Gaia DR1 5031808449327958912 ^[9]^[10]