Kepler-89

	Kepler-89
Sterrebeeld	Swaan
Spektraaltipe	F8 V
Soort	Hoofreeksster
	Waarnemingsdata (Epog J2000)
Regte klimming	19h 49m 19.9345s
Deklinasie	+41° 53′ 28.0059″
Skynmagnitude (m)	12,4
	Besonderhede
Massa (M☉)	1,25+0,03−0,04
Radius (R☉)	1,61+0,11−0,12
Ouderdom (jaar)	3,9+0,3−0,2 miljard
Temperatuur (K)	6 116
Rotasiespoed (km/s)	7,33 ± 0,32
Metaalinhoud [Fe/H]	-0,01 ± 0,04
	Ander name
	KOI-94, KIC 6462863, 2MASS J19491993+4153280
Portaal	Sterrekunde

Kepler-89 is ’n F-tipe ster in die sterrebeeld Swaan met vier bevestigde planete.^[4] Dit is moontlik ’n wye dubbelster.^[5]

Planeetstelsel

Die ontdekking van die vier planete in data van die Kepler-ruimteteleskoop is in Oktober 2012 aangekondig.^[6] Daaropvolgende metings van radiale snelheid het Kepler-89d se bestaan bevestig en aangedui dit is effens groter en swaarder as Saturnus.^[7] In Oktober 2013 is die ander drie planete se bestaan ook bevestig.

In 2012 is ’n gedeeltelike oorgang van die tweede buitenste planeet deur die buitenste planeet waargeneem – dit was die eerste keer dat ’n planeet-planeet-oorgang voor ’n ster gesien is.^[8]^[6]

Die Kepler-89-stelsel
Planeet of skyf (vanaf ster)	Massa	Halwe lengteas (AE)	Wentelperiode (dae)	Eksentrisiteit	Baanhelling (°)	Radius
b	<10,5 M_⊕	0,05	3,7	—	89,3	0,13 R_J
c	7,3-11,8 M_⊕	0,099	10,4	<0,1	88,36	0,31 R_J
d	0,33±0,034 M_J	0,165	22,3	<0,1	89,871	0,83 R_J
e	11,9-15,5 M_⊕	0,298	54,3	<0,1	89,76	0,49 R_J

Verwysings

↑ ^1,0 ^1,1 Brown, A.G.A.; et al. (Gaia collaboration) (Augustus 2018). "Gaia-data-uitreiking 2 (DR2): Opsomming van die inhoud". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2-rekord vir hierdie bron by VizieR.
↑ "Planet Kepler-89 b". Extrasolar Planets Encyclopaedia (in Engels). Geargiveer vanaf die oorspronklike op 1 Januarie 2019. Besoek op 26 April 2018.
↑ Hirano, Teruyuki; Narita, Norio; Sato, Bun'ei; Takahashi, Yasuhiro H; Masuda, Kento; Takeda, Yoichi; Aoki, Wako; Tamura, Motohide; Suto, Yasushi (2012). "Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler Photometry". The Astrophysical Journal. 759 (2): L36. arXiv:1209.4362. Bibcode:2012ApJ...759L..36H. doi:10.1088/2041-8205/759/2/L36.
↑ "Kepler-89". Simbad. Centre de données astronomiques de Strasbourg. Besoek op 2018-12-09
↑ Takahashi, Yasuhiro H.; Norio Narita; Teruyuki Hirano; Masayuki Kuzuhara; Motohide Tamura; Tomoyuki Kudo; Nobuhiko Kusakabe; Jun Hashimoto et al. (2013). "A Discovery of a Candidate Companion to a Transiting System KOI-94: A Direct Imaging Study for a Possibility of a False Positive".
↑ ^6,0 ^6,1 Teruyuki Hirano; Norio Narita; Bun'ei Sato; Takahashi, Yasuhiro H.; et al. (2012). "Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler Photometry". The Astrophysical Journal. 759 (2): L36. arXiv:1209.4362. Bibcode:2012ApJ...759L..36H. doi:10.1088/2041-8205/759/2/L36.
↑ Weiss, Lauren M.; Marcy, Geoffrey W.; Rowe, Jason F.; Howard, Andrew W.; Isaacson, Howard; Fortney, Jonathan J.; Miller, Neil; Demory, Brice-Olivier; Fischer, Debra A.; Adams, Elisabeth R.; Dupree, Andrea K.; Howell, Steve B.; Kolbl, Rea; Johnson, John Asher; Horch, Elliott P.; Everett, Mark E.; Fabrycky, Daniel C.; Seager, Sara (2013). "The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux". The Astrophysical Journal. 768 (1): 14. arXiv:1303.2150. Bibcode:2013ApJ...768...14W. doi:10.1088/0004-637X/768/1/14.
↑ "First ever discovery of planet-planet eclipse | UTokyo Research" (in Engels). u-tokyo.ac.jp. Geargiveer vanaf die oorspronklike op 4 November 2013. Besoek op 20 Januarie 2014.

Eksterne skakels

Tabel van bevestigde planete Geargiveer 1 April 2017 op Wayback Machine by Nasa se Kepler-sending
Hierdie artikel is vertaal uit die Engelse Wikipedia

[Gaia_DR2-1] 1,0 ^1,1 Brown, A.G.A.; et al. (Gaia collaboration) (Augustus 2018). "Gaia-data-uitreiking 2 (DR2): Opsomming van die inhoud". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2-rekord vir hierdie bron by VizieR.

[EU-2] "Planet Kepler-89 b". Extrasolar Planets Encyclopaedia (in Engels). Geargiveer vanaf die oorspronklike op 1 Januarie 2019. Besoek op 26 April 2018.

[Hirano-3] Hirano, Teruyuki; Narita, Norio; Sato, Bun'ei; Takahashi, Yasuhiro H; Masuda, Kento; Takeda, Yoichi; Aoki, Wako; Tamura, Motohide; Suto, Yasushi (2012). "Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler Photometry". The Astrophysical Journal. 759 (2): L36. arXiv:1209.4362. Bibcode:2012ApJ...759L..36H. doi:10.1088/2041-8205/759/2/L36.

[4] "Kepler-89". Simbad. Centre de données astronomiques de Strasbourg. Besoek op 2018-12-09

[5] Takahashi, Yasuhiro H.; Norio Narita; Teruyuki Hirano; Masayuki Kuzuhara; Motohide Tamura; Tomoyuki Kudo; Nobuhiko Kusakabe; Jun Hashimoto et al. (2013). "A Discovery of a Candidate Companion to a Transiting System KOI-94: A Direct Imaging Study for a Possibility of a False Positive".

[ref-504692851-6] 6,0 ^6,1 Teruyuki Hirano; Norio Narita; Bun'ei Sato; Takahashi, Yasuhiro H.; et al. (2012). "Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler Photometry". The Astrophysical Journal. 759 (2): L36. arXiv:1209.4362. Bibcode:2012ApJ...759L..36H. doi:10.1088/2041-8205/759/2/L36.

[7] Weiss, Lauren M.; Marcy, Geoffrey W.; Rowe, Jason F.; Howard, Andrew W.; Isaacson, Howard; Fortney, Jonathan J.; Miller, Neil; Demory, Brice-Olivier; Fischer, Debra A.; Adams, Elisabeth R.; Dupree, Andrea K.; Howell, Steve B.; Kolbl, Rea; Johnson, John Asher; Horch, Elliott P.; Everett, Mark E.; Fabrycky, Daniel C.; Seager, Sara (2013). "The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux". The Astrophysical Journal. 768 (1): 14. arXiv:1303.2150. Bibcode:2013ApJ...768...14W. doi:10.1088/0004-637X/768/1/14.

[u-tokyo-8] "First ever discovery of planet-planet eclipse | UTokyo Research" (in Engels). u-tokyo.ac.jp. Geargiveer vanaf die oorspronklike op 4 November 2013. Besoek op 20 Januarie 2014.

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