How Would You Like To Vacation At TRAPPIST-1 ?
Dear Friends & Neighbors,
(Please click on red links & note magenta)
Something quite exciting happened this month, on 22 February 2017, astronomers announced four additional exoplanets around TRAPPIST-1. This work used the NASA Spitzer Space Telescope and the Very Large Telescope at Paranal, among others, and brought the total number of planets to seven, of which three are considered to be within its habitable zone; conceivably, the others also could be habitable so far as they may possess liquid water somewhere on their surface. If any of the habitable zone planets have an atmosphere similar to that of the Earth, they are expected to possess oceans. However, this is unlikely as the extreme ultraviolet and x-ray radiation of the host star is much greater than that of the Sun and is high enough to have likely to have stripped these planets dry in a very short time.
TRAPPIST-1 is an ultra-cool dwarf star, of spectral class M8.0 ± 0.5, that is approximately 8% the mass of and 11% the radius of the Sun and, although slightly larger than Jupiter, about 84 times more massive. It has a temperature of 2550 K and is at least 500 million years old (beyond this minimum, indicating the star is past its youthful active phase, the age is poorly constrained due to the very slow evolution of this class of stars). In comparison, the Sun is about 4.6 billion years old and has a temperature of 5778 K.
In February 2017, astronomers announced that the planetary system of this star is composed of seven temperate terrestrial planets, of which five (b, c, e, f and g) are similar in size to Earth, and two (d and h) are intermediate in size between Mars (which has a diameter about half that of Earth) and Earth. Three (e, f and g) orbit in the habitable zone.The total mass of the six inner planets is about 0.02% the mass of TRAPPIST-1, a fraction similar to that for the Galilean satellites of Jupiter, suggesting perhaps a similar formation history.
Whether or not your children and/or grand children may be able to consider emigrating to one of these seven planets of the Trappist-1 system in the future, the finding of these planets indicates that we may not be alone! Some day our posterity may even be able to vacation on some of these planets of TRAPPIST-1 System.
(in order from star)
|b||0.85±0.72 M⊕||0.01111 (1.66 mln km)||1.51087081 ± 0.00000060||< 0.081||89.65 ± 0.25°||1.086 ± 0.035 R⊕|
|c||1.38±0.61 M⊕||0.01522 (2.28 mln km)||2.4218233 ± 0.0000017||< 0.083||89.67 ± 0.17°||1.056 ± 0.035 R⊕|
|d||0.41±0.27 M⊕||0.021 ± 0.006 (3.14 mln km)||4.049610 ± 0.000063||< 0.070||89.75 ± 0.16°||0.772 ± 0.030 R⊕|
|e||0.62±0.58 M⊕||0.028 (4.19 mln km)||6.099615 ± 0.000011||< 0.085||89.86 ± 0.11°||0.918 ± 0.039 R⊕|
|f||0.68±0.18 M⊕||0.037 (5.54 mln km)||9.206690 ± 0.000015||< 0.063||89.680 ± 0.034°||1.045 ± 0.038 R⊕|
|g||1.34±0.88 M⊕||0.045 (6.73 mln km)||12.35294 ± 0.00012||< 0.061||89.710 ± 0.025°||1.127 ± 0.041 R⊕|
|h||unknown (likely <1) M⊕||0.063+0.027
−0.013 (~9.4 mln km)
|unknown||89.80 ± 0.07°||0.755 ± 0.034 R⊕|
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