Kepler-25

	Kepler-25
Observationsdata; Epok: J2000.0
Stjärnbild	Lyran
Rektascension	19t 06m 33,2143s
Deklination	+39° 29′ 16,358 ″
Skenbar magnitud ()	10,623 ± 0,053
Stjärntyp
Spektraltyp	F V
Variabeltyp	Planetpassage-variabel
Astrometri
Radialhastighet ()	-8,557 ± 0,0033 km/s
Egenrörelse (µ)	RA: -0,455 ± 0,040 mas/år; Dek.: +6,169 ± 0,044 mas/år
Parallax ()	4,0822 ± 0,0236
Avstånd	799 ± 5 lå (245 ± 1 pc)
Detaljer
Massa	1,159 +0,040−0,051 M☉
Radie	1,297 ± 0,015 R☉
Luminositet	2,406 +0,126−0,128 L☉
Temperatur	6 270 ± 79 K
Metallicitet	-0,05 ± 0,10
Vinkelhastighet	9,5 km/s
Ålder	3,45 +0,81−0,72 miljarder år
Andra beteckningar
	KOI-244, TYC 3124-1264-1, AP J19063321+3929164, GSC 03124-01264, KIC 4349452, 2MASS J19063321+3929164, SDSS J190633.22+392916.5, UCAC2 45530915, UCAC3 259-146407, UCAC4 648-066811, USNO-B1.0 1294-00318425, Gaia DR3 2100451630105041152, Gaia DR2 2100451630105041152, Gaia DR1 2100451625808756608

Kepler-25 eller KOI-244, är en ensam stjärna belägen i den mellersta delen av stjärnbilden Lyran. Den har en skenbar magnitud av ca 10,62^[3] och kräver ett teleskop för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 4,08 mas,^[2] beräknas den befinna sig på ett avstånd på ca 800 ljusår (ca 245 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -9 km/s.^[5]

Egenskaper[redigera | redigera wikitext]

Kepler-25 är en gul till vit stjärna i huvudserien av spektralklass F V.^[4] Den har en massa som är ca 1,16^[6] solmassa, en radie som är ca 1,3^[6] solradie och utsänder energi från dess fotosfär motsvarande ca 2,4 gånger solen^[6] vid en effektiv temperatur av ca 6 300 K.^[6]

Planetsystem[redigera | redigera wikitext]

År 2011 upptäckte Keplerteleskopet två kandidatplaneter som passerade framför stjärnan.^[10] Dessa planeter har mycket snäv bana men ligger ändå i 1:2 omloppsresonansen till varandra, vilket tyder på frånvaron av andra planetariska objekt i den inre delen av planetsystemen.^[11] Dessa exoplaneter bekräftades genom metoden för mätning av variation i transittid.^[12] En tredje exoplanet upptäcktes genom uppföljande mätningar av radiell hastighet och bekräftades i januari 2014.^[8]

Planeternas omloppsbanor är väl samordnade med stjärnans ekvatorialplan, med en avvikelse av 7 ± 8°.^[13]

Kepler-25 solsystem^[14]^[4]
Planet	Massa	Halv storaxel (AE)	Siderisk omloppstid (d)	Excentricitet	Inklination	Radie
b	8,7 ^+2,5_−3,6 M_🜨	0,068	6,238297 ± 0,000017	0,029 ± 0,0017	92,827 ^+0,084_−0,083	2,748 ± 0,035 R_🜨
c	15,2 ± 1,3 M_🜨	0,11	12,7207 ± 0,0001	0,0061 ^{+ 0,0049}_−0,0041	92,764 ^+0,042_−0,039	5,217 ± 0,065 R_🜨
d	71,9 ± 9,8 M_🜨	-	122,4 ^+0,0_−0,07	0,13 ^+0,13_−0,09	-	-

Se även[redigera | redigera wikitext]

Referenser[redigera | redigera wikitext]

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, Kepler-25, 14 maj 2023..

Noter[redigera | redigera wikitext]

^ 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] 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] Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H. Vizier catalog entry
^ [a b c] Schneider, Jean, "Star: Kepler-25", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-06-16, hämtad 2013-12-18
^ [a b c] Kepler-25 (unistra.fr). Hämtad 2023-07-30.
^ [a b c d e f g h] Silva Aguirre, V.; et al. (2015). "Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology". Monthly Notices of the Royal Astronomical Society. 452 (2): 2127–2148. arXiv:1504.07992. Bibcode:2015MNRAS.452.2127S. doi:10.1093/mnras/stv1388.
^ [a b] Huber, Daniel; et al. (2013). "Fundamental Properties of Kepler Planet-candidate Host Stars using Asteroseismology". The Astrophysical Journal. 767 (2). 127. arXiv:1302.2624. Bibcode:2013ApJ...767..127H. doi:10.1088/0004-637X/767/2/127.
^ [a b] Marcy, Geoffrey W.; et al. (2014). "Masses, Radii, and Orbits of Small Kepler Planets: The Transition from Gaseous to Rocky Planets". The Astrophysical Journal Supplement Series. 210 (2). 20. arXiv:1401.4195. Bibcode:2014ApJS..210...20M. doi:10.1088/0067-0049/210/2/20.
^ "Kepler-25". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2019-10-02.
^ Borucki, William J.; et al. (2011). "Characteristics of Planetary Candidates Observed by Kepler. II. Analysis of the First Four Months of Data". The Astrophysical Journal. 736 (1). 19. arXiv:1102.0541. Bibcode:2011ApJ...736...19B. doi:10.1088/0004-637X/736/1/19.
^ Migaszewski, Cezary; Gozdziewski, Krzysztof (2018), "A periodic configuration of the Kepler-25 planetary system?", Monthly Notices of the Royal Astronomical Society, 480 (2): 1767–1777, arXiv:1803.10285, doi:10.1093/mnras/sty1972, S2CID 55395774
^ Steffen, Jason H.; et al. (2012). "Transit timing observations from Kepler - III. Confirmation of four multiple planet systems by a Fourier-domain study of anticorrelated transit timing variations". Monthly Notices of the Royal Astronomical Society. 421 (3): 2342–2354. arXiv:1201.5412. Bibcode:2012MNRAS.421.2342S. doi:10.1111/j.1365-2966.2012.20467.x.
^ Albrecht, Simon; Winn, Joshua N.; Marcy, Geoffrey W.; Howard, Andrew W.; Isaacson, Howard; Johnson, John A. (2013), "Low Stellar Obliquities in Compact Multiplanet Systems", The Astrophysical Journal, 771 (1): 11, arXiv:1302.4443, Bibcode:2013ApJ...771...11A, doi:10.1088/0004-637X/771/1/11, S2CID 17247029
^ Mills, Sean M.; et al. (2019). "Long-period Giant Companions to Three Compact, Multiplanet Systems". The Astronomical Journal. 157 (4). 145. arXiv:1903.07186. Bibcode:2019AJ....157..145M. doi:10.3847/1538-3881/ab0899.

Externa länkar[redigera | redigera wikitext]

https://www.universeguide.com/star/121495/kepler25.

[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] 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] Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H. Vizier catalog entry

[D-4] [a b c] Schneider, Jean, "Star: Kepler-25", Extrasolar Planets Encyclopaedia, Paris Observatory, archived from the original on 2012-06-16, hämtad 2013-12-18

[SIMBAD-5] [a b c] Kepler-25 (unistra.fr). Hämtad 2023-07-30.

[E-6] [a b c d e f g h] Silva Aguirre, V.; et al. (2015). "Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology". Monthly Notices of the Royal Astronomical Society. 452 (2): 2127–2148. arXiv:1504.07992. Bibcode:2015MNRAS.452.2127S. doi:10.1093/mnras/stv1388.

[F-7] [a b] Huber, Daniel; et al. (2013). "Fundamental Properties of Kepler Planet-candidate Host Stars using Asteroseismology". The Astrophysical Journal. 767 (2). 127. arXiv:1302.2624. Bibcode:2013ApJ...767..127H. doi:10.1088/0004-637X/767/2/127.

[H-8] [a b] Marcy, Geoffrey W.; et al. (2014). "Masses, Radii, and Orbits of Small Kepler Planets: The Transition from Gaseous to Rocky Planets". The Astrophysical Journal Supplement Series. 210 (2). 20. arXiv:1401.4195. Bibcode:2014ApJS..210...20M. doi:10.1088/0067-0049/210/2/20.

[I-9] "Kepler-25". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2019-10-02.

[J-10] Borucki, William J.; et al. (2011). "Characteristics of Planetary Candidates Observed by Kepler. II. Analysis of the First Four Months of Data". The Astrophysical Journal. 736 (1). 19. arXiv:1102.0541. Bibcode:2011ApJ...736...19B. doi:10.1088/0004-637X/736/1/19.

[K-11] Migaszewski, Cezary; Gozdziewski, Krzysztof (2018), "A periodic configuration of the Kepler-25 planetary system?", Monthly Notices of the Royal Astronomical Society, 480 (2): 1767–1777, arXiv:1803.10285, doi:10.1093/mnras/sty1972, S2CID 55395774

[L-12] Steffen, Jason H.; et al. (2012). "Transit timing observations from Kepler - III. Confirmation of four multiple planet systems by a Fourier-domain study of anticorrelated transit timing variations". Monthly Notices of the Royal Astronomical Society. 421 (3): 2342–2354. arXiv:1201.5412. Bibcode:2012MNRAS.421.2342S. doi:10.1111/j.1365-2966.2012.20467.x.

[M-13] Albrecht, Simon; Winn, Joshua N.; Marcy, Geoffrey W.; Howard, Andrew W.; Isaacson, Howard; Johnson, John A. (2013), "Low Stellar Obliquities in Compact Multiplanet Systems", The Astrophysical Journal, 771 (1): 11, arXiv:1302.4443, Bibcode:2013ApJ...771...11A, doi:10.1088/0004-637X/771/1/11, S2CID 17247029

[N-14] Mills, Sean M.; et al. (2019). "Long-period Giant Companions to Three Compact, Multiplanet Systems". The Astronomical Journal. 157 (4). 145. arXiv:1903.07186. Bibcode:2019AJ....157..145M. doi:10.3847/1538-3881/ab0899.

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