TVLM513-46546
Encyclopedia
TVLM513-46546 is an ultracool red dwarf
in the constellation Boötes
, exhibiting a flare star
activity and all the same varying semi-regularly due to dissimilarly bright hemispheres and a rotation period of about two days. The star has a mass as low as 90 times the mass of Jupiter
(or 9 percent of Sun
's mass) and an estimated radius of 11 percent that of Sun
(nearly a Jupiter
-sized star). The star also shows hints of an unseen companion with undetermined mass. Future monitoring will be able to confirm or rule out low-mass stellar or even planetary mass companions (down to 2-10 Jupiter
masses), with orbital periods spanning between 1 and 15 day
s.
Assuming a stellar luminosity of 0.042 percent that of Sun
, the habitable zone where an Earth-like planet
may retain liquid water at comfortable temperatures would be located within 0.02 Astronomical Unit
s (roughly 10 times the distance of the Moon
from Earth
).
Red dwarf
According to the Hertzsprung-Russell diagram, a red dwarf star is a small and relatively cool star, of the main sequence, either late K or M spectral type....
in the constellation Boötes
Boötes
Boötes is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek Βοώτης, Boōtēs, meaning herdsman or plowman...
, exhibiting a flare star
Flare star
A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes. It is believed that the flares on flare stars are analogous to solar flares in that they are due to magnetic reconnection in the atmospheres of the stars. The brightness increase is...
activity and all the same varying semi-regularly due to dissimilarly bright hemispheres and a rotation period of about two days. The star has a mass as low as 90 times the mass of Jupiter
Jupiter
Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...
(or 9 percent of Sun
Sun
The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields...
's mass) and an estimated radius of 11 percent that of Sun
Sun
The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields...
(nearly a Jupiter
Jupiter
Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...
-sized star). The star also shows hints of an unseen companion with undetermined mass. Future monitoring will be able to confirm or rule out low-mass stellar or even planetary mass companions (down to 2-10 Jupiter
Jupiter
Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...
masses), with orbital periods spanning between 1 and 15 day
Day
A day is a unit of time, commonly defined as an interval equal to 24 hours. It also can mean that portion of the full day during which a location is illuminated by the light of the sun...
s.
Assuming a stellar luminosity of 0.042 percent that of Sun
Sun
The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields...
, the habitable zone where an Earth-like planet
Earth-like planet
Earth-like planet is used as a synonym for either of the following:* Earth analog, denoting planets of a higher degree of similarity to Earth than terrestrial planets...
may retain liquid water at comfortable temperatures would be located within 0.02 Astronomical Unit
Astronomical unit
An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....
s (roughly 10 times the distance of the Moon
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
).