HD 142

	HD 142 B
Observationsdata
Rektascension	00t 06m 19,1480 s
Deklination	-49° 04′ 34,9177 ″
Skenbar magnitud ()	+11,5 (V)
Stjärntyp
Spektraltyp	K8.5 – M1.5
Astrometri
Egenrörelse (µ)	RA: +566,923 ± 0,387 mas/år; Dek.: -16,876 ± 0,273 mas/år
Parallax ()	38,2968 ± 0,0875
Avstånd	85,2 ± 0,2 lå (26,11 ± 0,06 pc)
Detaljer
Massa	0,54 ± 0,10 M☉
Andra beteckningar
	CD−49°14337B, WDS J00063-4905B, NLTT 218, 2MASS J00061919-4904348

	HD 142 A
Observationsdata; Epok: J2000.0
Stjärnbild	Fenix
Rektascension	00t 06m 19,1754 s
Deklination	-49° 04′ 30,6741 ″
Skenbar magnitud ()	+5,711 ± 0,003 (V)
Stjärntyp
Spektraltyp	F7 V
B–V	+0,519 ± 0,011
Astrometri
Radialhastighet ()	+6,00 ± 0,53 km/s
Egenrörelse (µ)	RA: +75,030 ± 0,058 mas/år; Dek.: -40,690 ± 0,077 mas/år
Parallax ()	38,1605 ± 0,0648
Avstånd	85,5 ± 0,1 lå (26,21 ± 0,04 pc)
Absolut magnitud ()	+3,66 ± 0,02
Detaljer
Massa	1,25 ± 0,10 M☉
Radie	1,41 ± 0,11 R☉
Luminositet	2,9 L☉
Temperatur	6 338 ± 46 K
Metallicitet	+0,03 ± 0,04 (Fe/H) dex
Vinkelhastighet	9,58 ± 0,74 km/s
Ålder	2,5 miljarder år
Andra beteckningar
	LHS 1020, CCDM J00063-4905A, CD-49 14337, CPD-49 11858, GJ 9002 A, GJ 4.2 A, HD 142, HD 142A, HIC 522, HIP 522, HR 6, 2MASS J00061921-4904307, NLTT 217, PLX 8, PPM 304555, SAO 214963, TD1 15, TYC 8025-341-1, uvby98 100000142, WDS J00063-4905A, WISEA J000619.77-490430.3, Gaia DR2 4976894960284258048

HD 142 är en vid dubbelstjärna^[12] i den mellersta delen av stjärnbilden Fenix. Den har en skenbar magnitud av ca 5,71^[3] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 38,2^[2] mas, beräknas den befinna sig på ett avstånd på ca 85 ljusår (ca 26 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 6 km/s.^[6]

Egenskaper

Primärstjärnan HD 142 A är en gul till vit stjärna i huvudserien av spektralklass F7 V.^[4] Den har en massa som är ca 1,3^[8] solmassor, en radie som är ca 1,4^[8] solradier och har ca 2,9 gånger solens utstrålning av energi^[8] från dess fotosfär vid en effektiv temperatur av ca 6 300 K.^[8]

En stjärna, HD 142 B, med skenbar magnitud 11,5^[8] upptäcktes 1894 vilket gjorde HD 142 till en dubbelstjärna.^[17] Följeslagaren bekräftades 2007 vara gravitationellt bunden och fastställdes till att vara en röd dvärg av spektraltyp K8.5-M1.5^[13] med 54 procent av solens massa.^[8] Paret har en beräknad separation av 120,6 AE.^[15]

Planetsystem

År 2001 tillkännagav det anglo-australiska planetsökteamet under ledning av Chris Tinney upptäckten av en exoplanet som kretsar kring primärstjärnan.^[18]^[19] En extra linjär trend i radiala hastighetsdata noterades 2006^[20] som kunde orsakas av en annan planet eller av följeslagaren.^[21] År 2012 medförde ytterligare mätningar upptäckten av en andra planet. En tredje möjlig planet med en period på 108 dygn sågs i datan, men med en felsannolikhet på fem procent.^[22] En annan rapport från samma team uppdaterade parametrarna för b och c men nämnde inte den möjliga planeten d.^[23]

HD 10647 solsystem^[22]^[23]
Planet	Massa	Halv storaxel (AE)	Siderisk omloppstid (d)	Excentricitet	Inklination	Radie
d (obekräftad)	≥ 0,30 M_J	0,469	108,39	0,12	-	-
b	≥1,268 ± 0,107 M_J	1,0467 ± 0,0015	352,48 ± 0,77	0,294 ± 0,076	-	-
c	≥5,35 ± 0,27 M_J	7,139 ± 0,025	6,268 ± 0,32	0,138 ± 0,055	-	-

Se även

Lista över exoplaneter

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 142, 27 juni 2021.

Noter

^ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
^ [a b c d e f g h] 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] Olsen, E. H. (1994). "Stroemgren photometry of F- and G-type stars brighter than V = 9.6. I. UVBY photometry". Astronomy and Astrophysics Supplement Series. 106: 257–266. Bibcode:1994A&AS..106..257O. Vizier catalog entry
^ [a b] Gray, R. O.; et al. (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.
^ 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] Valenti, J. A.; Fischer, D. A. (2005). "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs". The Astrophysical Journal Supplement Series. 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500.
^ Holmberg; et al. (2009). "HD 142". Geneva-Copenhagen Survey of Solar neighbourhood III. Hämtad 2010-01-27.
^ [a b c d e f g h i j k l] Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290
^ Soto, M. G.; Jenkins, J. S. (July 2018). "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue". Astronomy & Astrophysics. 615: 28. arXiv:1801.09698. Bibcode:2018A&A...615A..76S. doi:10.1051/0004-6361/201731533. A76.
^ [a b] HD 142 (u-strasbg.fr) |Hämtad 2022-01-17.
^ "HD 142". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2020-08-12.
^ [a b] Eggleton, P. P.; Tokovinin, A.A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
^ [a b] Eggenberger, A.; et al. (2007). "The impact of stellar duplicity on planet occurrence and properties I. Observational results of a VLT/NACO search for stellar companions to 130 nearby stars with and without planets". Astronomy and Astrophysics. 474 (1): 273–291. Bibcode:2007A&A...474..273E. doi:10.1051/0004-6361:20077447.
^ [a b c] 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] Tokovinin, A.; Kiyaeva, O. (February 2016). "Eccentricity distribution of wide binaries". Monthly Notices of the Royal Astronomical Society. 456 (2): 2070–2079. arXiv:1512.00278. Bibcode:2016MNRAS.456.2070T. doi:10.1093/mnras/stv2825.
^ "HD 142B". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2020-08-12.
^ Raghavan, Deepak; et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal. 646 (1): 523–542. arXiv:astro-ph/0603836. Bibcode:2006ApJ...646..523R. doi:10.1086/504823.
^ "Astronomers close in on Solar System's 'siblings'" (Press release). Marsfield, New South Wales, Australia: Australian Astronomical Observatory. October 15, 2001. Hämtad 10 juli 2016.
^ Tinney, C. G.; et al. (2002). "Two Extrasolar Planets from the Anglo-Australian Planet Search". The Astrophysical Journal. 571 (1): 528–531. arXiv:astro-ph/0111255. Bibcode:2002ApJ...571..528T. doi:10.1086/339916.
^ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.
^ Wright, J. T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658. Bibcode:2007ApJ...657..533W. doi:10.1086/510553.
^ [a b] Wittenmyer, Robert A.; et al. (2012). "The Anglo-Australian Planet Search. XXII. Two New Multi-planet Systems". The Astrophysical Journal. 753 (2). 169. arXiv:1205.2765. Bibcode:2012ApJ...753..169W. doi:10.1088/0004-637X/753/2/169.
^ [a b] Wittenmyer, Robert A.; et al. (2020). "Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search". Monthly Notices of the Royal Astronomical Society. 492 (1): 377–383. arXiv:1912.01821. Bibcode:2020MNRAS.492..377W. doi:10.1093/mnras/stz3436.

Externa länkar

https://www.universeguide.com/star/522/hd142.
”HD 142”. Open Exoplanet Catalogue. http://www.openexoplanetcatalogue.com/system.html?id=HD+142+A+b. Hämtad 2014-09-08.

[A-1] Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form

[B-2] [a b c d e f g h] 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.

[C-3] [a b] Olsen, E. H. (1994). "Stroemgren photometry of F- and G-type stars brighter than V = 9.6. I. UVBY photometry". Astronomy and Astrophysics Supplement Series. 106: 257–266. Bibcode:1994A&AS..106..257O. Vizier catalog entry

[F-4] [a b] Gray, R. O.; et al. (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.

[H-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.

[I-6] [a b] Valenti, J. A.; Fischer, D. A. (2005). "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs". The Astrophysical Journal Supplement Series. 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500.

[J-7] Holmberg; et al. (2009). "HD 142". Geneva-Copenhagen Survey of Solar neighbourhood III. Hämtad 2010-01-27.

[K-8] [a b c d e f g h i j k l] Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290

[L-9] Soto, M. G.; Jenkins, J. S. (July 2018). "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue". Astronomy & Astrophysics. 615: 28. arXiv:1801.09698. Bibcode:2018A&A...615A..76S. doi:10.1051/0004-6361/201731533. A76.

[SIMBAD-10] [a b] HD 142 (u-strasbg.fr) |Hämtad 2022-01-17.

[N-11] "HD 142". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2020-08-12.

[E-12] [a b] Eggleton, P. P.; Tokovinin, A.A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.

[G-13] [a b] Eggenberger, A.; et al. (2007). "The impact of stellar duplicity on planet occurrence and properties I. Observational results of a VLT/NACO search for stellar companions to 130 nearby stars with and without planets". Astronomy and Astrophysics. 474 (1): 273–291. Bibcode:2007A&A...474..273E. doi:10.1051/0004-6361:20077447.

[D-14] [a b c] 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.

[M-15] [a b] Tokovinin, A.; Kiyaeva, O. (February 2016). "Eccentricity distribution of wide binaries". Monthly Notices of the Royal Astronomical Society. 456 (2): 2070–2079. arXiv:1512.00278. Bibcode:2016MNRAS.456.2070T. doi:10.1093/mnras/stv2825.

[O-16] "HD 142B". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2020-08-12.

[P-17] Raghavan, Deepak; et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal. 646 (1): 523–542. arXiv:astro-ph/0603836. Bibcode:2006ApJ...646..523R. doi:10.1086/504823.

[Q-18] "Astronomers close in on Solar System's 'siblings'" (Press release). Marsfield, New South Wales, Australia: Australian Astronomical Observatory. October 15, 2001. Hämtad 10 juli 2016.

[R-19] Tinney, C. G.; et al. (2002). "Two Extrasolar Planets from the Anglo-Australian Planet Search". The Astrophysical Journal. 571 (1): 528–531. arXiv:astro-ph/0111255. Bibcode:2002ApJ...571..528T. doi:10.1086/339916.

[S-20] Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.

[T-21] Wright, J. T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658. Bibcode:2007ApJ...657..533W. doi:10.1086/510553.

[U-22] [a b] Wittenmyer, Robert A.; et al. (2012). "The Anglo-Australian Planet Search. XXII. Two New Multi-planet Systems". The Astrophysical Journal. 753 (2). 169. arXiv:1205.2765. Bibcode:2012ApJ...753..169W. doi:10.1088/0004-637X/753/2/169.

[V-23] [a b] Wittenmyer, Robert A.; et al. (2020). "Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search". Monthly Notices of the Royal Astronomical Society. 492 (1): 377–383. arXiv:1912.01821. Bibcode:2020MNRAS.492..377W. doi:10.1093/mnras/stz3436.

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Observationsdata Epok: J2000.0
HD 142 A

Stjärnbild	Fenix^[1]
Rektascension	00^t 06^m 19,1754 ^s^[2]
Deklination	-49° 04′ 30,6741 ″^[2]
Skenbar magnitud ( $V$ )	+5,711 ± 0,003 (V)^[3]
Stjärntyp
Spektraltyp	F7 V^[4]
B–V	+0,519 ± 0,011^[5]
Astrometri
Radialhastighet ( $R_{v}$ )	+6,00 ± 0,53^[6] km/s
Egenrörelse (µ)	RA: +75,030 ± 0,058^[2] mas/år Dek.: -40,690 ± 0,077^[2] mas/år
Parallax ( $\pi$ )	38,1605 ± 0,0648^[2]
Avstånd	85,5 ± 0,1 lå (26,21 ± 0,04 pc)
Absolut magnitud ( $M_{V}$ )	+3,66 ± 0,02^[7]
Detaljer
Massa	1,25 ± 0,10^[8] M_☉
Radie	1,41 ± 0,11^[8] R_☉
Luminositet	2,9^[8] L_☉
Temperatur	6 338 ± 46^[8] K
Metallicitet	+0,03 ± 0,04 (Fe/H) ^[8] dex
Vinkelhastighet	9,58 ± 0,74^[9] km/s
Ålder	2,5^[8] miljarder år
Andra beteckningar
LHS 1020, CCDM J00063-4905A, CD-49 14337, CPD-49 11858, GJ 9002 A, GJ 4.2 A, HD 142, HD 142A, HIC 522, HIP 522, HR 6, 2MASS J00061921-4904307, NLTT 217, PLX 8, PPM 304555, SAO 214963, TD1 15, TYC 8025-341-1, uvby98 100000142, WDS J00063-4905A, WISEA J000619.77-490430.3, Gaia DR2 4976894960284258048 ^[10]^[11]

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