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Proxima Centauri

Proxima Centauri

Posisi Proxima Centauri
Dhata pangamatan
Epos J2000.0
Rasi lintang Centaurus
Asensio rekta 14j 29m 42.9487d[1]
Dhéklinasi −62° 40′ 46.141″[1]
Magnitudo katon (V) 11,05[1]
Ciri-ciri
Kelas spektrumM5.5 Ve[1]
Indèks warna U-B1,43[1]
Indèks warna B-V1,90[1]
Jinis variabelLintang suar
Astrometri
Kacepetan radhial (Rv)−21,7 ± 1,8[2] km/s
Gerak dhiri (μ) RA: −3775,40[1] mas/taun
Dek.: 769,33[1] mas/taun
Paralaks (π)768.7 ± 0.3[3] mas
Let4.243 ± 0.002 tc
(1.3009 ± 0.0005 pc)
Magnitudo mutlak (MV)15,49[4]
Detail
Massa0,123 ± 0,006[5] M☉
Radhius0,145 ± 0,011[5] R☉
Gravitasi permukaan (log g)5,20 ± 0,23[5]
Luminositas (bolometrik)0,0017[6] L☉
Suhu3,042 ± 117[5] K
Rotasi83,5 hari[7]
Umur4,85 × 109[8] taun
Pamènèhan jeneng liya
Alpha Centauri C, CCDM J14396-6050C, GCTP 3278.00, GJ 551, HIP 70890, LFT 1110, LHS 49, LPM 526, LTT 5721, NLTT 37460, V645 Centauri[1]
Réferènsi database
SIMBAD data

Proxima Centauri[9] iku lintang kate abang kang manggon adohé 4,2 taun cahya (3,97×1013 km). Lintang iki ana ing rasi lintang Centaurus. Proxima Centauri tinemu nalika taun 1915 déning Robert Innes, Dirèktur Observatorium Union ing Aprikah Kidul. Lintang iki wujud lintang paling cerak saka srengéngé,[8] sanajan mbleret banget kanggo dideleng nganggo mata langsung. Leté menyang lintang paling cerak kaloro lan katelu (kang tatalaku lintang gandha Alpha Centauri) yaiku 0,237 ± 0,011 taun cahya (15.000 ± 700 ékan astronomi).[10] Proxima Centauri kamungkinan wujud péranganing tatalaku lintang telu bebarengan karo Alpha Centauri A lan B.

Amarga kacerakané, dhiameter pojok lintang iki bisa diukur kanthi langsung, yaiku watara 1/7 saka srengéngé.[8] Bobot isen Proxima Centauri diprakirakaké watara 1/8 saka srengéngé, sauntara rata-rata bobot jinisé watara kaping 40é srengéngé.[nb 1] Sanajan duwé drajat luminositas kang asor, Proxima iku lintang suar kang ngalami paningkatan kacerahan minangka akibat saka kamobahan mahnitjati.[11] Médhan mahnit lintang iki kawangun liwat konvèksi ing badan lintang, lan marakake kamobahan semburan kang ngetokaké piwetu sinar X.[12] Pacampuran "bahan obong" ing inti Proxima Centauri liwat konvèksi lan drajat prodhuksi ènèrgi lintang kang rélatif asor nuduhaké yèn lintang iki kamungkinan bakal tetep dadi lintang dhèrèt utama suwéné patang trilyun taun sabanjuré.[13][14]

Panggolèkan bandha langit pangiring Proxima Centauri ora olèh kasil. Kamungkinan anané katé coklat lan raseksa gas wis dibusak.[15] Drajat kamobahan lintang nambah riricuh marang pangukuran karikatan radhial, saéngga matesi prospèk panemon objèk pangorbit.[16][17] Paninjoan karikatan radhial uga nyingkiraké kamungkinan anané bumi super ing laladan pantes panggon Proxima Centauri.[18][19][20][nb 2] Panggolèkan bandha-bandha langit kang luwih cilik merlokaké piranti-piranti anyar, kaya ta teleskop antariksa James Webb.[21] Amarga kacerakané karo Bumi, lintang iki wis diusulaké minangka pituju saka panjlajahan antarlintang.[22]

  1. ↑ a b c d e f g h i "SIMBAD query result: V* V645 Cen -- Flare Star". Centre de Données astronomiques de Strasbourg. Dibukak ing 2008-08-11.—some of the data is located under "Measurements".
  2. ↑ García-Sánchez, J.; Weissman, P. R.; Preston, R. A.; Jones, D. L.; Lestrade, J.-F.; Latham, D. W.; Stefanik, R. P.; Paredes, J. M. (2001). "Stellar encounters with the solar system". Astronomy and Astrophysics. 379: 634–659. doi:10.1051/0004-6361:20011330. Dibukak ing 2008-06-12.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. ↑ Masalah sitiran: Tenger <ref> ora trep; ora ana tèks tumrap refs kanthi jeneng apj118
  4. ↑ Kamper, K. W.; Wesselink, A. J. (1978). "Alpha and Proxima Centauri". Astronomical Journal. 83: 1653–1659. doi:10.1086/112378. Dibukak ing 2008-08-03.
  5. ↑ a b c d Ségransan, D.; Kervella, P.; Forveille, T.; Queloz, D. (2003). "First radius measurements of very low mass stars with the VLTI". Astronomy and Astrophysics. 397: L5–L8. doi:10.1051/0004-6361:20021714. Dibukak ing 2008-08-07.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  6. ↑ See Table 1, Doyle, J. G.; Butler, C. J. (1990). "Optical and infrared photometry of dwarf M and K stars". Astronomy and Astrophysics. 235: 335–339. Bibcode:1990A&A...235..335D. and p. 57, Peebles, P. J. E. (1993). Principles of Physical Cosmology. Princeton, New Jersey: Princeton University Press. ISBN 0691019339.
  7. ↑ Benedict, G. Fritz; et al. (1998). "Photometry of Proxima Centauri and Barnard's Star Using Hubble Space Telescope Fine Guidance Sensor 3: A Search for Periodic Variations". The Astronomical Journal. 116 (1): 429–439. doi:10.1086/300420. Dibukak ing 2007-07-09.
  8. ↑ a b c Kervella, Pierre; Thevenin, Frederic (2003-03-15). "A Family Portrait of the Alpha Centauri System: VLT Interferometer Studies the Nearest Stars". ESO. Diarsip saka sing asli ing 2008-06-16. Dibukak ing 2007-07-09.{{cite news}}: CS1 maint: multiple names: authors list (link)
  9. ↑ "Latin Resources". Joint Association of Classical Teachers. Diarsip saka sing asli ing 2007-07-08. Dibukak ing 2007-07-15.
  10. ↑ Wertheimer, Jeremy G.; Laughlin, Gregory (2006). "Are Proxima and α Centauri Gravitationally Bound?". The Astronomical Journal. 132 (5): 1995–1997. doi:10.1086/507771. Dibukak ing 2007-07-09.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  11. ↑ Christian, D. J.; Mathioudakis, M.; Bloomfield, D. S.; Dupuis, J.; Keenan, F. P. (2004). "A Detailed Study of Opacity in the Upper Atmosphere of Proxima Centauri". The Astrophysical Journal. 612 (2): 1140–1146. doi:10.1086/422803. Dibukak ing 2008-06-13.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  12. ↑ Masalah sitiran: Tenger <ref> ora trep; ora ana tèks tumrap refs kanthi jeneng apj547
  13. ↑ Masalah sitiran: Tenger <ref> ora trep; ora ana tèks tumrap refs kanthi jeneng adams
  14. ↑ Dunkley, J.; et al. "Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results". NASA. Dibukak ing 2008-03-06.
  15. ↑ Kürster, M.; et al. (1999). "Precise radial velocities of Proxima Centauri. Strong constraints on a substellar companion". Astronomy & Astrophysics Letters. 344: L5–L8. Bibcode:1999A&A...344L...5K. Dibukak ing 2008-12-19.
  16. ↑ Saar, Steven H.; Donahue, Robert A. (1997). "Activity-related Radial Velocity Variation in Cool Stars". Astrophysical Journal. 485: 319–326. doi:10.1086/304392. Dibukak ing 2008-07-11.
  17. ↑ Masalah sitiran: Tenger <ref> ora trep; ora ana tèks tumrap refs kanthi jeneng apj119
  18. ↑ Tarter, Jill C.; et al. (2007). "A Reappraisal of The Habitability of Planets around M Dwarf Stars". Astrobiology. 7 (1): 30–65. doi:10.1089/ast.2006.0124. PMID 17407403.
  19. ↑ Khodachenko, Maxim L.; et al. (2007). "Coronal Mass Ejection (CME) Activity of Low Mass M Stars as An Important Factor for The Habitability of Terrestrial Exoplanets. I. CME Impact on Expected Magnetospheres of Earth-Like Exoplanets in Close-In Habitable Zones". Astrobiology. 7 (1): 167–184. doi:10.1089/ast.2006.0127. PMID 17407406.
  20. ↑ Endl, M. and Kürster, M. (2008). "Toward detection of terrestrial planets in the habitable zone of our closest neighbor: Proxima Centauri". Astronomy and Astrophysics. 488 (3): 1149–1153. Bibcode:2008A&A...488.1149E. doi:10.1051/0004-6361:200810058.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  21. ↑ Masalah sitiran: Tenger <ref> ora trep; ora ana tèks tumrap refs kanthi jeneng numbers
  22. ↑ Gilster, Paul (2004). Centauri Dreams: Imagining and Planning. Springer. ISBN 038700436X.


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