HN Librae

HN Librae
	Estrella variable, Estrella variable BY Draconis (es) , estrella con movimiento propio alto (es) , estrella y near-IR source (en)
Datos d'observación
Ascensión reuta (α)	218,57004859311 °
Declinación (δ)	−12,519559582094 °
Distancia a la Tierra	6,253 pc
Magnitú aparente (V)	11,317 (banda V)
Constelación	Llibra
Velocidá de rotación	0,52 km/s
Velocidá radial	−1,426 km/s
Parallax	159,9225 mas
Carauterístiques físiques
Radiu	0,299 Radius solars
Masa	0,291 M☉
Gravedá superficial	81 500 cm/s²
Tipu espectral	M3.96
Otros nomes
	Ver llista GJ 555 (Catálogu Gliese); GSC 05572-00804 (Guide Star Catalog (es) ); HIC 71253 (Hipparcos Input Catalogue (en) ); HIP 71253 (Catálogu Hipparcos); JP11 280 (JP11 (en) ); LFT 1120 (Luyten Five-Tenths catalogue (en) ); LHS 2945 (Luyten Half-Second catalogue (en) ); LPM 532 (Luyten Proper-Motion catalogue (en) ); LTT 5759 (Luyten Two-Tenths catalogue (en) ); 2MASS J14341683-1231106 (2MASS (es) ); NLTT 37751 (New Luyten Two-Tenths catalogue (en) ); NSV 6707 (New Catalogue of Suspected Variable Stars (es) ); PLX 3296 (General Catalogue of Trigonometric Stellar Parallaxes (es) ); PLX 3296.00 (General Catalogue of Trigonometric Stellar Parallaxes (es) ); UBV 12727 (UBV Photoelectric Photometry Catalogue (en) ); UCAC4 388-063886 (Fourth USNO CCD Astrograph Catalog (en) ); Zkh 208 (Catálogo Zakhozhaj (es) ); Karmn J14342-125 (CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS (en) ); PM J14342-1231 (Catalogs of proper-motion stars. I. Stars brighter than visual magnitude 15 and with annual proper motion of 1" or more (en) ); Ci 20 870 (Catalogue of proper motion stars (en) ); PM 14316-1219 (Catalogs of proper-motion stars. I. Stars brighter than visual magnitude 15 and with annual proper motion of 1" or more (en) ); Gaia DR2 6324325225803432320 (Gaia DR2 (es) ); HN Lib (General Catalogue of Variable Stars); Gaia DR3 6324325225803432320 (Gaia DR3 (es) ); TIC 294401924 (TESS Input Catalog (en) ); TYC 5572-804-1 (Tycho Catalogue (en) ); UBV M 5328 (UBV Photoelectric Photometry Catalogue (en) );

Coordenaes: 14^h 34^m 16.812^s, -12^° 31^′ 10.414^″

HN Librae (HN Lib / GJ 555 / HIP 71253)^[9] ye una estrella na constelación de Llibra de magnitú aparente +11,35. Asitiada a 20,0 años lluz de distancia, ye una de les 100 estrelles más cercanes al Sistema Solar.^[10]

HN Librae ye una nana colorada de tipu espectral M3.5V^[10] con una temperatura efectivo de 3150 K.^[11] Tien una masa de 0,22 mases solares^[10] y relluma con una lluminosidá equivalente al 0,1% de la lluminosidá solar.^[12] El so metalicidá, espresada como la rellación ente los conteníos de fierro y hidróxenu, ye aproximao igual a la solar ([Fe/H] = +0,01).^[13] Ye una estrella variable del tipu BY Draconis, onde les fluctuaciones de lluminosidá tán rellacionaes cola presencia de manches na superficie o otru tipu d'actividá cromosférica. La variación de rellumu de HN Librae ye de 0,03 magnitúes.^[14]

Los sistemes estelares más cercanos a Gliese 555 son Gliese 570, a 3,6 años lluz, y Gliese 581, a 4,3 años lluz; esta postrera ye una estrella bien similar a HN Librae onde s'afayaron dellos planetes estrasolares. 61 Virginis, nana mariella análoga al Sol, alcuéntrase a pocu más de 11 años lluz de HN Librae.^[15]

Referencies[editar | editar la fonte]

↑ ^1,0 ^1,1 ^1,2 ^1,3 ^1,4 Afirmao en: SIMBAD.
↑ Afirmao en: General Catalogue of Variable Stars.
↑ ^3,0 ^3,1 ^3,2 ^3,3 Afirmao en: Gaia EDR3. Stated in source according to: SIMBAD. Llingua de la obra o nome: inglés. Data d'espublización: 3 avientu 2020.
↑ «UBV(RI)C JHKobservations ofHipparcos-selected nearby stars» (n'inglés). Monthly Notices of the Royal Astronomical Society (4): páxs. 1949–1968. 21 abril 2010. doi:10.1111/J.1365-2966.2009.16182.X.
↑ Caroline Soubiran (agostu 2018). «Gaia Data Release 2. The catalogue of radial velocity standard stars» (n'inglés). Astronomy and Astrophysics: páxs. 7–7. doi:10.1051/0004-6361/201832795.
↑ ^6,0 ^6,1 Afirmao en: The CARMENES search for exoplanets around M dwarfs. A sub-Neptunian mass planet in the habitable zone of HN Lib. Stated in source according to: Extrasolar Planets Encyclopaedia. Extrasolar Planets Encyclopaedia exoplanet ID: hn_lib_b--8687. DOI: 10.1051/0004-6361/202346276. Data d'espublización: 2023.
↑ Jason Wright (xunetu 2021). «The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades» (n'inglés). The Astrophysical Journal Supplement Series (1): páxs. 8. doi:10.3847/1538-4365/ABE23C.
↑ Suvrath Mahadevan (23 marzu 2015). «M dwarf luminosity, radius, and {alpha}-enrichment from I-band spectral features» (n'inglés). The Astrophysical Journal (1): páxs. 10. doi:10.1088/2041-8205/802/1/L10.
↑ HN Librae - Variable Star (SIMBAD)
↑ ^10,0 ^10,1 ^10,2 The One Hundred Nearest Star Systems (RECONS)
↑ Morales, J. C.; Ribas, I.; Jordi, C. (2008). «The effect of activity on stellar temperatures and radii». Astronomy and Astrophysics 478 (2). pp. 507-512 (Tabla consultada en CDS). http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008A%26A...478..507M&db_key=AST&nosetcookie=1.
↑ Gliese 555 (The Internet Stellar Database)
↑ Bonfils, X.; Delfosse, X.; Udry, S.; Santos, N. C.; Forveille, T.; Ségransan, D. (2005). «Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence». Astronomy and Astrophysics 442 (2). pp. 635-642. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...442..635B&db_key=AST&nosetcookie=1.
↑ HN Librae (General Catalogue of Variable Stars)
↑ Stars within 15 light-years of Bonner Durchmusterung -11°3759 (The Internet Stellar Database)

Coordenaes: 14^h 34^m 16.812^s, -12^° 31^′ 10.414^″

[8ba559d5760a03bedaaacc3c347bbfe4981560bf-1] 1,0 ^1,1 ^1,2 ^1,3 ^1,4 Afirmao en: SIMBAD.

[b2ad9017671982757d0f49921afa6c148c9cb871-2] Afirmao en: General Catalogue of Variable Stars.

[88f46fab9cce60c7e274ff942763157775017282-3] 3,0 ^3,1 ^3,2 ^3,3 Afirmao en: Gaia EDR3. Stated in source according to: SIMBAD. Llingua de la obra o nome: inglés. Data d'espublización: 3 avientu 2020.

[2689ae0347ecc8f2daa26956f02e559c5bb77868-4] «UBV(RI)C JHKobservations ofHipparcos-selected nearby stars» (n'inglés). Monthly Notices of the Royal Astronomical Society (4): páxs. 1949–1968. 21 abril 2010. doi:10.1111/J.1365-2966.2009.16182.X.

[23a8a76a076e8c6f97400bff58e706d0e856d2ea-5] Caroline Soubiran (agostu 2018). «Gaia Data Release 2. The catalogue of radial velocity standard stars» (n'inglés). Astronomy and Astrophysics: páxs. 7–7. doi:10.1051/0004-6361/201832795.

[bf24b79094e170b69b35f39428236fa917461bf6-6] 6,0 ^6,1 Afirmao en: The CARMENES search for exoplanets around M dwarfs. A sub-Neptunian mass planet in the habitable zone of HN Lib. Stated in source according to: Extrasolar Planets Encyclopaedia. Extrasolar Planets Encyclopaedia exoplanet ID: hn_lib_b--8687. DOI: 10.1051/0004-6361/202346276. Data d'espublización: 2023.

[a44d9a97bc87eaeee10abf86bcf7f301a57627cb-7] Jason Wright (xunetu 2021). «The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades» (n'inglés). The Astrophysical Journal Supplement Series (1): páxs. 8. doi:10.3847/1538-4365/ABE23C.

[74ff480e7aae534a24c89f565aa90c1575c4e9f5-8] Suvrath Mahadevan (23 marzu 2015). «M dwarf luminosity, radius, and {alpha}-enrichment from I-band spectral features» (n'inglés). The Astrophysical Journal (1): páxs. 10. doi:10.1088/2041-8205/802/1/L10.

[SIMBAD-9] HN Librae - Variable Star (SIMBAD)

[RECONS-10] 10,0 ^10,1 ^10,2 The One Hundred Nearest Star Systems (RECONS)

[11] Morales, J. C.; Ribas, I.; Jordi, C. (2008). «The effect of activity on stellar temperatures and radii». Astronomy and Astrophysics 478 (2). pp. 507-512 (Tabla consultada en CDS). http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008A%26A...478..507M&db_key=AST&nosetcookie=1.

[12] Gliese 555 (The Internet Stellar Database)

[13] Bonfils, X.; Delfosse, X.; Udry, S.; Santos, N. C.; Forveille, T.; Ségransan, D. (2005). «Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence». Astronomy and Astrophysics 442 (2). pp. 635-642. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...442..635B&db_key=AST&nosetcookie=1.

[14] HN Librae (General Catalogue of Variable Stars)

[15] Stars within 15 light-years of Bonner Durchmusterung -11°3759 (The Internet Stellar Database)

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