Gliese 849

Gliese 849
Gliese 849
Classe spettraleM3,5 V
Distanza dal Sole28,750 ± 0,008 anni luce
CostellazioneAquario
Coordinate
(all'epoca J2000.0)
Ascensione retta22h 09m 40,34431s[1]
Declinazione-04° 38′ 26,6508″[1]
Dati fisici
Raggio medio0,464±0,018[2] R
Massa
0,465±0,011 [2] M
Periodo di rotazione40,45+0,19
−0,18
 giorni
[3]
Temperatura
superficiale
  • 3 467±68[3] (media)
Luminosità
0,02887±0,00025 L
Metallicità0,09±0,09 [Fe/H][3]
Età stimata> 3 miliardi di anni
Dati osservativi
Magnitudine app.10,41[4]
Magnitudine ass.10,62[4]
Parallasse113,4447[1]
Velocità radiale−15,26±0,10[4]
Nomenclature alternative
BD −05°5715, GCRV 13921, GJ=849, HIP 109388, LFT 1689, LHS 517, LPM 814, LTT 8889, NLTT 53078, 2MASS J22094029-0438267[5]

Gliese 849, o GJ 849, è una piccola stella rossastra (nana rossa) nella costellazione equatoriale dell'Acquario ed è invisibile ad occhio nudo, avendo una magnitudine apparente di 10,41.[4] La stella, in base alla parallasse,[1] si trova a 28,8 anni luce (8,8 parsec) dalla Terra e si sta avvicinando al Sole con una velocità radiale di -15,3 km/s.[4] In orbita intorno ad essa sono stati individuati due pianeti giganti gassosi.[6]

La stella ha circa la metà della massa e delle dimensioni del Sole[2] e ruota lentamente con un periodo di rotazione di circa 40 giorni.[3][7] L'età stimata della stella è di oltre tre miliardi di anni.[2] Ha una luminosità che è il 2,9% di quella del Sole[8] e una temperatura superficiale di 3.470 K.[3]

Sistema planetario

Alla fine del 2006, è stato segnalato che un esopianeta di lungo periodo simile a Giove orbitava attorno alla nana rossa per un periodo di poco più di 5 anni. C'era anche un andamento lineare nelle velocità radiali che suggeriva un altro compagno di periodo più lungo. L'andamento delle velocità radiali è stato confermato nel 2013.[9] L’orbita del secondo pianeta extrasolare è stata finalmente determinata nel 2015. Il primo pianeta scoperto, Gliese 849 b, è stato il primo pianeta scoperto in orbita attorno a una nana rossa con un semiasse maggiore maggiore di 0,21 UA.[6]

PianetaTipoMassaPeriodo orb.Sem. maggioreEccentricitàScoperta
bGioviano caldo0,893+0,094
−0,097
 MJ
1925,31±6,5 giorni2,32+0,11
−0,13
UA
0,029±0,0192006
cGioviano caldo0,099±0,011 MJ5990+110
−100
 giorni
4,95+0,25
−0,28
UA
0,092+0,038
−0,036
2015

Note

  1. ^ a b c d Gaia Collaboration, A. Vallenari e A. G. A. Brown, Gaia Data Release 3. Summary of the content and survey properties, in Astronomy and Astrophysics, vol. 674, 1º giugno 2023, pp. A1, DOI:10.1051/0004-6361/202243940. URL consultato il 16 settembre 2023.
  2. ^ a b c d R. Paul Butler, John Asher Johnson e Geoffrey W. Marcy, A Long‐Period Jupiter‐Mass Planet Orbiting the Nearby M Dwarf GJ 8491, in Publications of the Astronomical Society of the Pacific, vol. 118, n. 850, 2006-12, pp. 1685–1689, DOI:10.1086/510500. URL consultato il 17 settembre 2023.
  3. ^ a b c d e M. Pinamonti, D. Barbato e A. Sozzetti, The GAPS programme at TNG. XLVI. Deep search for low-mass planets in late-dwarf systems hosting cold Jupiters, in Astronomy & Astrophysics, vol. 677, 2023-09, pp. A122, DOI:10.1051/0004-6361/202346476. URL consultato il 16 settembre 2023.
  4. ^ a b c d e E. Anderson e Ch. Francis, XHIP: An extended hipparcos compilation, in Astronomy Letters, vol. 38, 1º maggio 2012, pp. 331–346, DOI:10.1134/S1063773712050015. URL consultato il 16 settembre 2023.
  5. ^ GJ 849, su simbad.cds.unistra.fr. URL consultato il 16 settembre 2023.
  6. ^ a b (EN) Y. Katherina Feng, Jason T. Wright e Benjamin Nelson, THE CALIFORNIA PLANET SURVEY IV: A PLANET ORBITING THE GIANT STAR HD 145934 AND UPDATES TO SEVEN SYSTEMS WITH LONG-PERIOD PLANETS*, in The Astrophysical Journal, vol. 800, n. 1, 2015-02, pp. 22, DOI:10.1088/0004-637X/800/1/22. URL consultato il 17 settembre 2023.
  7. ^ (EN) A. Suárez Mascareño, R. Rebolo e J. I. González Hernández, Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators, in Monthly Notices of the Royal Astronomical Society, vol. 452, n. 3, 21 settembre 2015, pp. 2745–2756, DOI:10.1093/mnras/stv1441. URL consultato il 17 settembre 2023.
  8. ^ J. Sebastian Pineda, Allison Youngblood e Kevin France, The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars, in The Astrophysical Journal, vol. 918, n. 1, 1º settembre 2021, pp. 40, DOI:10.3847/1538-4357/ac0aea. URL consultato il 17 settembre 2023.
  9. ^ (EN) X. Bonfils, X. Delfosse e S. Udry, The HARPS search for southern extra-solar planets - XXXI. The M-dwarf sample, in Astronomy & Astrophysics, vol. 549, 1º gennaio 2013, pp. A109, DOI:10.1051/0004-6361/201014704. URL consultato il 17 settembre 2023.

Voci correlate

Altri progetti

Collegamenti esterni

  Portale Stelle: accedi alle voci di Wikipedia che trattano di stelle e costellazioni

Read other articles:

Facciata del Collegio Borromeo di Pellegrino Tibaldi Per ville e palazzi di Pavia si intendono gli edifici civili di particolare rilievo artistico della città di Pavia. Indice 1 Storia 2 Elenco palazzi 2.1 XII secolo 2.2 XIII secolo 2.3 XIV secolo 2.4 XV secolo 2.5 XVI secolo 2.6 XVII secolo 2.7 XVIII secolo 2.8 XIX secolo 2.9 XX secolo 3 Note 4 Bibliografia 5 Voci correlate Storia Città fondata in epoca romana, le prime notizie certe sulla presenza di palazzi a Pavia risalgono tuttavia al ...

 

سرشيو تقسيم إداري البلد إيران  [1] التقسيم الأعلى محافظة أذربيجان الغربية  إحداثيات 36°16′17″N 45°26′42″E / 36.27138889°N 45.445°E / 36.27138889; 45.445  السكان التعداد السكاني 91 نسمة (إحصاء 2016) الرمز الجغرافي 6676913  تعديل مصدري - تعديل   سرشيو هي قرية في مقاطعة سردشت، إير

 

  هذه المقالة عن مصطلح سياسي. لمعانٍ أخرى، طالع تمرد (توضيح). جزء من سلسلة عنالثورات أنواع ملونة اشتراكية ديموقراطية سلمية دائمة سياسية اجتماعية موجة الطرق مقاطعة عصيان مدني حرب أهلية صراع الطبقات الاجتماعية انقلاب مظاهرات حرب عصابات عصيان مسلح مقاومة سلمية احتجاج تمر

Urso-polar Indivíduo nas proximidades de Kaktovik, Ilha Barter, Alasca. Estado de conservação Vulnerável (IUCN 3.1) [1] Classificação científica Reino: Animalia Filo: Chordata Classe: Mammalia Ordem: Carnivora Família: Ursidae Género: Ursus Espécie: U. maritimus Nome binomial Ursus maritimusPhipps, 1774 Distribuição geográfica Distribuição do urso-polar (em verde). Sinónimos Sinonímia da espécie[2] Ursus marinus Pallas, 1776 Ursus polaris Shaw, 1792 Thalassarctos eogroenland...

 

Angie Craig Angela Dawn Craig (lahir 14 Februari 1972) adalah seorang politikus Amerika Serikat yang menjabat sebagai anggota DPR sejak 2019. Sebagai anggota Partai Demokrat, ia mengalahkan petahana Partai Republik Jason Lewis dalam pemilu 2018.[1] Referensi ^ Angie Craig Tops Jason Lewis For 2nd District Seat. WCCO. November 6, 2018.  Pranala luar Wikimedia Commons memiliki media mengenai Angie Craig. Congresswoman Angie Craig official U.S. House website Campaign website Diarsip...

 

مصطفى البياز معلومات شخصية الاسم الكامل مصطفى البياز الميلاد 12 فبراير 1960 (العمر 63 سنة)المغرب الطول 1.73 م (5 قدم 8 بوصة) مركز اللعب مدافع الجنسية المغرب  المسيرة الاحترافية1 سنوات فريق م. (هـ.) – الكوكب المراكشي 1987–1988 بينافيل 1 (0) المنتخب الوطني –  المغرب 8 (0) المواقع...

بيانيزا Villa_Leumann, house of the town hall. شعار بيانيزاشعار بيانيزاشعار الاسم الرسمي Comune di Pianezza   الإحداثيات 45°6′N 7°33′E / 45.100°N 7.550°E / 45.100; 7.550 تقسيم إداري  البلد إيطاليا[1]  التقسيم الأعلى مدينة تورينو الحضرية (1 يناير 2015–)  خصائص جغرافية  المساحة 16٫5 كم2 (6٫4...

 

مسييه 102معلومات عامةرمز الفهرس 2MASX J15062956+5545479[1]IRAS 15051+5557[1]IRAS F15051+5557[1] الكوكبة التنين الانزياح الأحمر 0٫002528[2] المسافة من الأرض 14٫72 megaparsec (en) [3] السرعة الشعاعية 674 كيلومتر في الثانية[4][3] الشكل المورفولوجي للمجرة SAB0[5] القدر الظاهري 9٫89[6] الحقب...

 

2016 studio album by Little SimzStillness in WonderlandStudio album by Little SimzReleased16 December 2016Length44:28LanguageEnglishLabelAge 101 MusicLittle Simz chronology A Curious Tale of Trials + Persons(2015) Stillness in Wonderland(2016) Grey Area(2019) Singles from Stillness In Wonderland Poison IvyReleased: 12 December 2016 Picture PerfectReleased: 14 December 2016 BackseatReleased: 11 May 2017 Good For WhatReleased: 11 October 2017 Stillness in Wonderland is the second studio...

American judge (born 1949) Thomas L. AmbroSenior Judge of the United States Court of Appeals for the Third CircuitIncumbentAssumed office February 6, 2023Judge of the United States Court of Appeals for the Third CircuitIn officeFebruary 16, 2000 – February 6, 2023Appointed byBill ClintonPreceded byWalter King StapletonSucceeded byTamika Montgomery-Reeves Personal detailsBornThomas Lee Ambro[1] (1949-12-27) December 27, 1949 (age 73)Cambridge, Ohio, U.S.EducationGeo...

 

У Вікіпедії є статті про інші значення цього терміна: Церква святих верховних апостолів Петра і Павла. Церква святих верховних апостолів Петра і Павла (Лозова) Тип церкваКраїна  Україна : ISO3166-1 alpha-3:UKR; ISO3166-1 цифровий:804; Розташування ЛозоваКонфесія УГКЦБудівниц...

 

Catholic ecclesiastical territory Diocese of Saint John in New BrunswickDioecesis Sancti Ioannis CanadensisDiocèse de Saint-Jean au Nouveau-Brunswickcatholic Cathedral of the Immaculate ConceptionCoat of armsLocationCountryCanadaEcclesiastical provinceMonctonHeadquartersSaint John, New BrunswickCoordinates45°16′48″N 66°03′25″W / 45.28000550°N 66.05683120°W / 45.28000550; -66.05683120StatisticsArea60,000 km2 (23,000 sq mi)Population- Tot...

Motoniveladora. Una motoniveladora es una máquina de construcción que cuenta con una larga hoja metálica empleada para nivelar terrenos. Además posee escarificadores para terrenos duros, los cuales puede ubicar al frente, en medio del eje delantero y la cuchilla o en la parte trasera, llamándose en este caso ripper. Motoniveladora GS-14.02 Generalmente presentan tres ejes: la cabina y el motor se encuentran situados en la parte posterior, sobre los dos ejes tractores, y el tercer eje se ...

 

У этого термина существуют и другие значения, см. Покровский собор. Православный храмПокровский собор 59°33′51″ с. ш. 30°07′19″ в. д.HGЯO Страна  Россия Город Гатчина Конфессия Православие Епархия Гатчинская Архитектурный стиль Русский Автор проекта Леонид Харла...

 

Management model For other uses of McKinsey, see McKinsey (disambiguation). This article may require cleanup to meet Wikipedia's quality standards. The specific problem is: Most of the history section seems to be taken from the Wikipedia article for In Search of Excellence, and its relevance here is not clear. There is very little content about the actual structure and use of the model except for a few bullet points. Please help improve this article if you can. (June 2021) (Learn how and when...

Не следует путать с Цифровая бумага. Электронная книга — устройство, в котором используется электронная бумага Электро́нная бума́га (англ. e-paper, electronic paper; также электронные чернила, англ. e-ink) — технология отображения информации, разработанная для имитации об...

 

Probabilistic graphical model Dynamic Bayesian Network composed by 3 variables. Bayesian Network developed on 3 time steps. Simplified Dynamic Bayesian Network. All the variables do not need to be duplicated in the graphical model, but they are dynamic, too. A dynamic Bayesian network (DBN) is a Bayesian network (BN) which relates variables to each other over adjacent time steps. History A dynamic Bayesian network (DBN) is often called a two-timeslice BN (2TBN) because it says that at any poi...

 

German cigarette brand This article contains content that is written like an advertisement. Please help improve it by removing promotional content and inappropriate external links, and by adding encyclopedic content written from a neutral point of view. (April 2022) (Learn how and when to remove this template message) R6Product typeCigaretteOwnerReemtsma, a subsidiary of Imperial TobaccoProduced byReemtsma, a subsidiary of Imperial TobaccoCountryWeimar RepublicIntroduced1921; 102...

2012 United States gubernatorial elections ← 2011 November 6, 2012June 5 (Wisconsin recall) 2013 → 14 governorships12 states; 2 territories[a]   Majority party Minority party   Party Republican Democratic Seats before 29 20 Seats after 30 19 Seat change 1 1 Popular vote 8,305,687[1] 7,992,567 Percentage 49.7% 47.9% Seats up 4 8 Seats won 5 7 Map of the results     Democratic hold   ...

 

South Korean TV series The Liar and His LoverPromotional PosterAlso known asLovely Love LieHangul그녀는 거짓말을 너무 사랑해Literal meaningShe Loves Lies Too MuchRevised RomanizationGeunyeoneun Geojitmaleul Neomu Saranghae GenreRomantic comedyBased onKanojo wa Uso o Aishisugiteruby Kotomi AokiDeveloped byStudio DragonWritten byKim Kyung-MinDirected byKim Jin-minCreative directorJinnie Jin-hee ChoiStarringLee Hyun-wooPark Soo-youngLee Jung-jinLee Seo-wonHong Seo-youngCountry of ori...

 

Strategi Solo vs Squad di Free Fire: Cara Menang Mudah!