K2-18

K2-18
	; Artist's impression of the K2-18 system, with K2-18 on left, K2-18b on right, and K2-18c between.
	; Approximate two-dimensional location of the star (in red circle); Sigma Leonis is the nearest bright star, which is in a southerly direction, and the boundary of Virgo is similarly far.
Data pengamatan; Epos J2000.0 Ekuinoks J2000.0
Rasi bintang	Leo
Asensio rekta	11j 30m 14.518d
Deklinasi	+07° 35′ 18.26″
Magnitudo tampak (V)	13.50
Ciri-ciri
Tahap evolusi	Katai merah
Kelas spektrum	M2.8
Astrometri
Gerak diri (μ)	RA: −80,377 mdb/thn ; Dek.: −133,142 mdb/thn
Paralaks (π)	26,2686±0,0546 mdb
Jarak	124,2 ± 0,3 tc ; (38,07 ± 0,08 pc)
Detail
Massa	0.495 M☉
Radius	0.469 R☉
Luminositas	0.0234 L☉
Suhu	3,503 K
Metalisitas [Fe/H]	0,123±0,157
Referensi basis data
SIMBAD	data

K2-18, juga disebut EPIC 201912552, adalah sebuah bintang katai merah yang berjarak 124 tahun cahaya (38 pc) dari bumi, di konstelasi Leo. Bintang ini memiliki 2 eksoplanet yang mengitarinya, salah satunya adalah Bumi super yang terletak di zona layak huni K2-18, dan satunya lagi adalah sebuah eksoplanet bernama K2-18c, yang sudah dikonfirmasi.^[7]

Planet

Anggota
(diurut dari bintang) Massa Sumbu semimayor
(AU) Periode orbit
(hari) Eksentrisitas Inklinasi Jari-jari

c 7.5±1.3 M_⊕ 0.060±0.003 8.962±0.008 < 0.4700 — —

b

8.0±1.9 M_⊕

0.143±0.006

32.9396±0.0001

<0.43

—

2.4±0.2 R_⊕|}

Referensi

^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (kolaborasi Gaia) (Agustus 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  . Catatan Gaia DR2 untuk sumber tersebut di VizieR.
^ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog. Bibcode:2012yCat.1322....0Z.
^ Montet, Benjamin T.; et al. (5 August 2015). "Stellar and Planetary Properties of K2 Campaign 1 Candidates and Validation of 17 Planets, Including a Planet Receiving Earth-like Insolation". The Astrophysical Journal. 809 (1): 25. arXiv:1503.07866  . Bibcode:2015ApJ...809...25M. doi:10.1088/0004-637X/809/1/25.
^ ^a ^b ^c Cloutier, R.; Astudillo-Defru, N.; Doyon, R.; Bonfils, X.; Almenara, J.-M.; Bouchy, F.; Delfosse, X.; Forveille, T.; Lovis, C.; Mayor, M.; Menou, K.; Murgas, F.; Pepe, F.; Santos, N. C.; Udry, S.; Wünsche, A. (2019). "Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES". Astronomy & Astrophysics. 621: A49. arXiv:1810.04731  . Bibcode:2019A&A...621A..49C. doi:10.1051/0004-6361/201833995.
^ Martinez, Arturo O.; Crossfield, Ian J. M.; Schlieder, Joshua E.; Dressing, Courtney D.; Obermeier, Christian; Livingston, John; Ciceri, Simona; Peacock, Sarah; Beichman, Charles A.; Lépine, Sébastien; Aller, Kimberly M.; Chance, Quadry A.; Petigura, Erik A.; Howard, Andrew W.; Werner, Michael W. (2017). "Stellar and Planetary Parameters for K2's Late-type Dwarf Systems from C1 to C5". The Astrophysical Journal. 837 (1): 72. arXiv:1701.00588  . Bibcode:2017ApJ...837...72M. doi:10.3847/1538-4357/aa56c7.
^ Benneke, Björn; Werner, Michael; Petigura, Erik; Knutson, Heather; Dressing, Courtney; Crossfield, Ian J. M.; Schlieder, Joshua E.; Livingston, John; Beichman, Charles; Christiansen, Jessie; Krick, Jessica; Gorjian, Varoujan; Howard, Andrew W.; Sinukoff, Evan; Ciardi, David R.; Akeson, Rachel L. (2017). "Spitzer Observations Confirm and Rescue the Habitable-zone Super-Earth K2-18b for Future Characterization". The Astrophysical Journal. 834 (2): 187. arXiv:1610.07249  . Bibcode:2017ApJ...834..187B. doi:10.3847/1538-4357/834/2/187.
^ ^a ^b Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama :0

Kesalahan pengutipan: Tag <ref> dengan nama "exmachina" yang didefinisikan di <references> tidak digunakan pada teks sebelumnya.
Kesalahan pengutipan: Tag <ref> dengan nama "habitable" yang didefinisikan di <references> tidak digunakan pada teks sebelumnya.

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Artikel bertopik bintang ini adalah sebuah rintisan. Anda dapat membantu Wikipedia dengan mengembangkannya.

[dr2-1] Brown, A. G. A.; et al. (kolaborasi Gaia) (Agustus 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  . Catatan Gaia DR2 untuk sumber tersebut di VizieR.

[UCAC4-2] Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog. Bibcode:2012yCat.1322....0Z.

[montet2015-3] Montet, Benjamin T.; et al. (5 August 2015). "Stellar and Planetary Properties of K2 Campaign 1 Candidates and Validation of 17 Planets, Including a Planet Receiving Earth-like Insolation". The Astrophysical Journal. 809 (1): 25. arXiv:1503.07866  . Bibcode:2015ApJ...809...25M. doi:10.1088/0004-637X/809/1/25.

[cloutier2019-4] Cloutier, R.; Astudillo-Defru, N.; Doyon, R.; Bonfils, X.; Almenara, J.-M.; Bouchy, F.; Delfosse, X.; Forveille, T.; Lovis, C.; Mayor, M.; Menou, K.; Murgas, F.; Pepe, F.; Santos, N. C.; Udry, S.; Wünsche, A. (2019). "Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES". Astronomy & Astrophysics. 621: A49. arXiv:1810.04731  . Bibcode:2019A&A...621A..49C. doi:10.1051/0004-6361/201833995.

[arturo2017-5] Martinez, Arturo O.; Crossfield, Ian J. M.; Schlieder, Joshua E.; Dressing, Courtney D.; Obermeier, Christian; Livingston, John; Ciceri, Simona; Peacock, Sarah; Beichman, Charles A.; Lépine, Sébastien; Aller, Kimberly M.; Chance, Quadry A.; Petigura, Erik A.; Howard, Andrew W.; Werner, Michael W. (2017). "Stellar and Planetary Parameters for K2's Late-type Dwarf Systems from C1 to C5". The Astrophysical Journal. 837 (1): 72. arXiv:1701.00588  . Bibcode:2017ApJ...837...72M. doi:10.3847/1538-4357/aa56c7.

[benneke2017-6] Benneke, Björn; Werner, Michael; Petigura, Erik; Knutson, Heather; Dressing, Courtney; Crossfield, Ian J. M.; Schlieder, Joshua E.; Livingston, John; Beichman, Charles; Christiansen, Jessie; Krick, Jessica; Gorjian, Varoujan; Howard, Andrew W.; Sinukoff, Evan; Ciardi, David R.; Akeson, Rachel L. (2017). "Spitzer Observations Confirm and Rescue the Habitable-zone Super-Earth K2-18b for Future Characterization". The Astrophysical Journal. 834 (2): 187. arXiv:1610.07249  . Bibcode:2017ApJ...834..187B. doi:10.3847/1538-4357/834/2/187.

[:0-7] Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama :0

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Data pengamatan Epos J2000.0 Ekuinoks J2000.0
Artist's impression of the K2-18 system, with K2-18 on left, K2-18b on right, and K2-18c between.
Approximate two-dimensional location of the star (in red circle); Sigma Leonis is the nearest bright star, which is in a southerly direction, and the boundary of Virgo is similarly far.
Rasi bintang	Leo
Asensio rekta	11^j 30^m 14.518^d^[1]
Deklinasi	+07° 35′ 18.26″^[1]
Magnitudo tampak (V)	13.50^[2]
Ciri-ciri
Tahap evolusi	Katai merah
Kelas spektrum	M2.8^[3]
Astrometri

Gerak diri (μ)	RA: −80,377^[1] mdb/thn Dek.: −133,142^[1] mdb/thn
Paralaks (π)	26,2686±0,0546^[1] mdb
Jarak	124,2 ± 0,3 tc (38,07 ± 0,08 pc)

Detail

Massa	0.495^[4] M_☉
Radius	0.469^[4] R_☉
Luminositas	0.0234^[5] L_☉
Suhu	3,503^[4] K
Metalisitas [Fe/H]	0,123±0,157^[6]

Referensi basis data
SIMBAD	data