TRAPPIST-1b
| TRAPPIST-1b | |
|---|---|
![Figure of imagination that TRAPPIST-1b and TRAPPIST-1c cause transit at the same time [1]](https://upload.wikimedia.org/wikipedia/commons/thumb/5/50/Artist%27s_view_of_planets_transiting_red_dwarf_star_in_TRAPPIST-1_system.jpg/300px-Artist%27s_view_of_planets_transiting_red_dwarf_star_in_TRAPPIST-1_system.jpg) | |
| Figure of imagination that TRAPPIST-1b and TRAPPIST-1c cause transit at the same time [1] | |
| Constellation | Aquarius |
| Classification | Extrasolar planet Rock planet |
| Orbital kind | Circular orbit |
| Discovery | |
| The discovery year | 2016 [2] |
| Detector | TRAPPIST telescope () |
| Discovery method | The transit method |
| An orbital element and property | |
| Orbit semimajor axis (a) | 0.01111+-0.00040 au [3] |
| Eccentricity (e) | 0 (flxed)[3] |
| Revolution period (P) | 1.510848+-0.000019 days [3] |
| Orbit angle of inclination (i) | 89.41 +-0.41 degrees [3] |
| Planet of TRAPPIST-1 | |
| Position Epoch: J2000.0 | |
| Right ascension (RA,α) | 23h 06m 29.283s [4] |
| Declination (Dec,δ) | -05° 02′ 28.59″[4] |
| Red shift | -0.000188 ± 0.000010[4] |
| Radial velocity (Rv) | -56.3+-3km/s [4] |
| Proper motion (μ) | Right ascension: 922.1+-1.8 milliseconds / year [4] Declination: -471.9+-1.8 milliseconds / year [4] |
| Annual parallax (π) | 82.58 +-2.58 milliseconds / year [4] |
| Distance | 39.4 ± 1.3 Light-year (12.1+-0.4 parsec [2]) |
| Physical property | |
| Diameter | 14,200km |
| Radius | 1.113 +-0.044 RE[3] |
| Surface area | 6.319×108 km2 |
| Volume | 2.486×1012 km3 |
| Mass | 1.38 ME (guess) [5] |
| Surface temperature | 400+-9 K (albedo in the case of 0.00) [3] 285+-7 K (albedo in the case of 0.75) [3] |
| Age | > 500 million years [3] |
| Atmospheric pressure | Ignorance |
| The other name | |
| The other name | 2MASS J23062928-0502285 b |
| ■Project ■ Template | |
TRAPPIST-1b is an extrasolar planet revolving in red dwarf TRAPPIST-1 at the position 39.4 light-year away in the direction of Aquarius seeing from the earth. I was discovered by the transit method in 2016 by TRAPPIST telescope () [6].
Table of contents
Characteristic
| The earth | TRAPPIST-1b |
|---|---|
 |  |
TRAPPIST-1b is assumed a rock planet with size of 1.113 times of the earth and, among the planets of three that pro-TRAPPIST-1, are discovered, revolves most in the inside. The distance from a main star revolves in 0.01111au (approximately 1,660,000km) having only approximately 4 times from the earth to a month in only one and a half days. However, it becomes only 400K (127 degrees Celsius) even if main star TRAPPIST-1 assumes albedo with 0 for the very small fixed star called the Jupiter class. It becomes 285K (7 degrees Celsius) when I suppose albedo to be 0.75 and becomes the temperature that can hold liquid water.
Atmosphere
On May 4, 2016, TRAPPIST-1b caused transit (the fixed star surface passage) at the same time with TRAPPIST-1c which revolved in the outside. The state was observed by the Hubble Space Telescope and tried the analysis of the atmosphere ingredient. As a result, the detailed atmosphere ingredient did not become clear, but became clear when was not the atmosphere met with hydrogen such as at least gas planet [7]; [8].
Source
- ^ Artist's view of planets transiting red dwarf star in TRAPPIST-1 system Spacetelescope
- ^ a b Planet TRAPPIST-1 b The Extrasolar Planet Encyclopaedia
- ^ a b c d e f g h Temperate Earth-sized planets transiting a nearby ultracool dwarf star ArXiv
- ^ a b c d e f g 2MASS J23062928-0502285 - - High proper-motion Star SIMBAD
- ^ Habitable worlds with JWST: transit spectroscopy of the TRAPPIST-1 system? ArXiv
- ^ Around a dwarf star of the very-low temperature, life is discovery AstroArts in three planets of the earth size that can exist
- ^ A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c Nature
- Observation AstroArts first by the atmosphere of the system superior planet of the ^ earth size
Allied item
This article is taken from the Japanese Wikipedia TRAPPIST-1b
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