Gliese 436
Gliese 436 adalah sebuah bintang katai merah yang berjarak sekitar 331 tahun cahaya (101 parsec) jauhnya di rasi bintang zodiak Leo.
| Data pengamatan Epos J2000 Ekuinoks J2000 | |
|---|---|
| Rasi bintang | Leo |
| Asensio rekta | 11j 42m 11.09368d[1] |
| Deklinasi | +26° 42′ 23.6537″[1] |
| Magnitudo tampak (V) | 10.67[2] |
| Ciri-ciri | |
| Kelas spektrum | M2.5 V[2] |
| Magnitudo semu (B) | ~12.20[3] |
| Magnitudo semu (V) | ~10.68[3] |
| Magnitudo semu (J) | 6.900 ± 0.024[4] |
| Magnitudo semu (H) | 6.319 ± 0.023[4] |
| Magnitudo semu (K) | 6.073 ± 0.016[4] |
| Indeks warna U−B | +1.23[5] |
| Indeks warna B−V | +1.52[2] |
| Astrometri | |
| Kecepatan radial (Rv) | +10.0[6] km/s |
| Gerak diri (μ) | RA: +896.07[1] mdb/thn Dek.: –813.54[1] mdb/thn |
| Paralaks (π) | 98,61±2,33[1] mdb |
| Jarak | 33,1 ± 0,8 tc (10,1 ± 0,2 pc) |
| Magnitudo mutlak (MV) | 10.63[2] |
| Detail | |
| Massa | 0.41 ± 0.05[2] M☉ |
| Radius | 0.42[7] R☉ |
| Luminositas | 0.025[2] L☉ |
| Gravitasi permukaan (log g) | 5.0[8] |
| Suhu | 3,318[7] K |
| Metalisitas [Fe/H] | –0.32 ± 0.12[9] |
| Kecepatan rotasi (v sin i) | 1.0[10] km/s |
| Usia | 6.5–9.9[11] gigatahun |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia | data |
Pada 2004, keberadaan sebuah eksoplanet transit, Gliese 436b, diverifikasikan sebagai planet yang mengorbit bintang tersebut. Pada 2012, keberadaan planet kedua, UCF-1.01,[12] juga diverifikasikan.
Properti
Gliese 436 adalah sebuah bintang M2.5V,[2] yang artinya bahwa bintang tersebut merupakan bintang katai merah. Model Stellar memberikan ukuran perkiraan sekitar 42% dari radius matahari. Model yang sama juga memprediksi bahwa atmosfer luar memiliki temperatur efektif 3,318 K[7]
Gliese 436 lebih tua dari Matahari beberapa miliar tahun.
Referensi
- van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. - Butler, R. Paul; et al. (2004). "A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436". The Astrophysical Journal. 617 (1): 580–588. arXiv:astro-ph/0408587
. Bibcode:2004ApJ...617..580B. doi:10.1086/425173. Diakses tanggal 2009-12-26. - Reid, I. Neill; et al. (July 2004), "Meeting the Cool Neighbors. VIII. A Preliminary 20 Parsec Census from the NLTT Catalogue", The Astronomical Journal, 128 (1): 463–483, arXiv:astro-ph/0404061
, Bibcode:2004AJ....128..463R, doi:10.1086/421374 - Cutri, R. M.; et al. (June 2003), 2MASS All Sky Catalog of point sources, NASA/IPAC, Bibcode:2003tmc..book.....C
- "Query Result:LHS 310 -- High proper-motion Star". SIMBAD Astronomical Object Database. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2007-11-28.
- Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953QB901.W495.....
- Johnson, H. M.; Wright, C. D. (1983). "Predicted infrared brightness of stars within 25 parsecs of the sun". Astrophysical Journal Supplement Series. 53: 643–711. Bibcode:1983ApJS...53..643J. doi:10.1086/190905.—see page 673.
- Maness, H. L.; et al. (January 2007), "The M Dwarf GJ 436 and its Neptune-Mass Planet", The Publications of the Astronomical Society of the Pacific, 119 (851): 90–101, arXiv:astro-ph/0608260
, Bibcode:2007PASP..119...90M, doi:10.1086/510689 - Bean, Jacob L.; Benedict, G. Fritz; Endl, Michael (2006). "Metallicities of M Dwarf Planet Hosts from Spectral Synthesis". The Astrophysical Journal (abstract). 653 (1): L65–L68. arXiv:astro-ph/0611060
. Bibcode:2006ApJ...653L..65B. doi:10.1086/510527.—for the metallicity, note that or 48% - Jenkins, J. S.; et al. (October 2009), "Rotational Velocities for M Dwarfs", The Astrophysical Journal, 704 (2): 975–988, arXiv:0908.4092
, Bibcode:2009ApJ...704..975J, doi:10.1088/0004-637X/704/2/975 - Saffe, C.; Gómez, M.; Chavero, C. (2006). "On the Ages of Exoplanet Host Stars". Astronomy & Astrophysics. 443 (2): 609–626. arXiv:astro-ph/0510092
. Bibcode:2005A&A...443..609S. doi:10.1051/0004-6361:20053452. - New Planet Found: Molten "Mars" Is "Right Around the Corner", Dave Mosher, National Geographic News, 19 Juli 2012
- Stevenson, Kevin B.; et al. (July 2012). "Two nearby sub-Earth-sized exoplanet candidates in the GJ 436 system". The Astrophysical Journal. arXiv:1207.4245
. Bibcode:2012ApJ...755....9S. doi:10.1088/0004-637X/755/1/9. - Sherrod, P. Clay; Koed, Thomas L. (2003), A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations, Astronomy Series, Courier Dover Publications, hlm. 9, ISBN 0486428206
- "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, diarsipkan dari versi asli tanggal 2012-03-10, diakses tanggal 2012-01-16
Pranala luar
- "Gliese 436 / AC+27 28217". Sol Company. Diakses tanggal 2007-11-28.
- "GJ 436". l’Observatoire de Paris. Diarsipkan dari versi asli tanggal 2012-04-01. Diakses tanggal 2009-05-20.
- "New Planet Found: Molten "Mars" Is "Right Around the Corner"". National Geographic. Diakses tanggal 2012-07-20.
Templat:Sistem bintang berjarak 30 – 35 tahun cahaya
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