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PIA21429 - Transit Illustration of TRAPPIST-1.jpg
Airtist's impression o TRAPPIST-1 an its seiven planets
Observation data
Epoch       Equinox
Constellation Aquarius
Richt ascension 23h 06m 29.283s[2]
Declination –05° 02′ 28.59″[2]
Apparent magnitude (V) 18.80
Spectral type M8V[3]
M8.2V[note 1]
V−R colour index 2.33
R−I colour index 2.47
Radial velocity (Rv)−56.3 km/s
Parallax (π)82.58 mas
Distance39.5 ± 1.3 ly
(12.1 ± 0.4 pc)
Absolute magnitude (MV)18.4 ± 0.1
Mass0.08 ± 0.009 M
Mass83.8048 ± 9.428 MJup
Radius0.114 ± 0.006 R
Luminosity (bolometric)0.000525±0.000036[4] L
Luminosity (visual, LV)0.00000373[note 2] L
Surface gravity (log g)~5.227[note 3][5] cgs
Temperatur2550 ± 55 K
Metallicity0.04 ± 0.08
Rotation1.40 ± 0.05 days
Rotational velocity (v sin i)6 ± 2 km/s
Age> 1 Gyr
Ither designations
2MASS J23062928-0502285, 2MASSI J2306292-050227, 2MASSW J2306292-050227, 2MUDC 12171
Database references

TRAPPIST-1, an aa kent as 2MASS J23062928-0502285,[6] is an ultra-cuil dwarf starn[4][7] locatit 39 light-years (12 parsecs; 370 petametres) away frae Yird in the constellation Aquarius.[8]

In 2015 astronomers discovered three Yird-sized planets orbitin the dwarf starn. The team wis led bi Michaël Gillon at the Varsity o Liège in Belgium; thay detectit the planets uisin transit photometry wi the Transiting Planets and Planetesimals Small Telescope (TRAPPIST) at the La Silla Observatory in Chile.[9][7][10] On 22 Februar 2017, astronomers annoonced fower additional exoplanets aroond TRAPPIST-1.[11] Besides TRAPPIST, this wirk utilised the Very Large Telescope at Paranal an the NASA Spitzer Space Telescope, amang ithers, an brocht the tot nummer o planets orbitin the starn tae seiven, o which at least three, an possibly aw, are in its habitable zone.[12][13]

Notes[eedit | eedit soorce]

  1. based on photometric spectral teep estimation
  2. Takin the absolute veesual magnitude o TRAPPIST-1 an the absolute veesual magnitude o the Sun , the veesual luminosity can be calculatit bi
  3. The surface gravity is calculatit directly frae Newton's law o universal gravitation, which gies the formula whaur M is the mass o the object, r is its radius, an G is the gravitational constant.

References[eedit | eedit soorce]

  1. "TRAPPIST-1b". Open Exoplanet Catalogue. Retrieved 2 May 2016.
  2. 2.0 2.1 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (June 2003). "2MASS All Sky Catalog of point sources". VizieR Online Data Catalog. European Southern Observatory with data provided by the SAO/NASA Astrophysics Data System. 2246. Bibcode:2003yCat.2246....0C.
  3. Costa, E.; Mendez, R.A.; Jao, W.-C.; Henry, T.J.; Subasavage, J.P.; Ianna, P.A. (4 August 2006). "The Solar Neighborhood. XVI. Parallaxes from CTIOPI: Final Results from the 1.5 m Telescope Program". The Astronomical Journal. The American Astronomical Society. 132 (3): 1234. Bibcode:2006AJ....132.1234C. doi:10.1086/505706.
  4. 4.0 4.1 Gillon, M.; Jehin, E.; Lederer, S. M.; Delrez, L.; De Wit, J.; Burdanov, A.; Van Grootel, V.; Burgasser, A. J.; Triaud, A. H. M. J.; Opitom, C.; Demory, B.-O.; Sahu, D. K.; Bardalez Gagliuffi, D.; Magain, P.; Queloz, D. (2016). "Temperate Earth-sized planets transiting a nearby ultracool dwarf star" (PDF). Nature. 533 (7602): 221–224. doi:10.1038/nature17448.
  5. Viti, Serena; Jones, Hugh R. A. (November 1999). "Gravity dependence at the bottom of the main sequence". Astronomy and Astrophysics. 351: 1028–1035. Bibcode:1999A&A...351.1028V. Retrieved 6 May 2016.
  6. *"2MASS J23062928-0502285". SIMBAD. Centre de données astronomiques de Strasbourg.
  7. 7.0 7.1 "Three Potentially Habitable Worlds Found Around Nearby Ultracool Dwarf Star – Currently the best place to search for life beyond the Solar System". European Southern Observatory.
  8. Chang, Kenneth (22 February 2017). "7 Earth-Size Planets Identified in Orbit Around a Dwarf Star". New York Times. Retrieved 22 February 2017.
  9. "Could these newly-discovered planets orbiting an ultracool dwarf host life?". The Guardian. 2 May 2016.
  10. "Three New Planets Are the Best Bets for Life". Popular Mechanics. 2 May 2016. Retrieved 2 May 2016.
  11. TRAPPIST-1 System - Discovery of Earth-Like Planets - Check123, Video Encyclopedia (in Inglis), retrieved 2017-02-23
  12. "Temperate Earth-Sized Planets Found in Extraordinarily Rich Planetary System TRAPPIST-1". SpaceRef. 22 February 2017. Retrieved 11 February 2017.
  13. "NASA telescope reveals largest batch of Earth-size, habitable-zone planets around single star". Exoplanet Exploration: Planets Beyond our Solar System. NASA. Retrieved 22 February 2017.

Coordinates: Sky map 23h 06m 29.383s, −05° 02′ 28.59″