The orbit of an Earth - like planet around the tight binary system that star Ba forms with its brown dwarf companion in the liquid water zone would have to be centered around 1.1 AU — a little farther than Earth's
orbital distance around Sol — with an orbital period exceeding one Earth year.
The planet moves between 1.7 and 2.5 AUs in
orbital distance around Errai A, with an average separation of around 1.8 AUs, which would be between the orbital distance of Earth and Mars in the Solar System.
It is possible, however, that the presence of massive planetary candidate c at
an orbital distance around two AUs could disrupt the orbital stability of an Earth - mass planet in the habitable zone.
Viewed from a planet at Earth's
orbital distance around Alpha Centauri A, stellar companion B would provide more light than the full Moon does on Earth as its brightest night sky object, but the additional light at a distance greater than Saturn's orbital distance in the Solar System would not be significant for the growth of Earth - type life.
Not exact matches
They eliminated those with
orbital radii less than one tenth that of Earth's, because at that
distance moon systems might not remain in stable orbits
around their planets on billion - year timescales.
«To be able to directly image planetary birth environments
around other stars at
orbital distances comparable to the solar system is a major advancement,» said Dr Nikku Madhusudhan of Cambridge's Institute of Astronomy, one of the paper's co-authors.
Still, its sun is smaller and cooler than ours, and Gliese 667Cc's
orbital distance means it probably receives
around 90 percent of the energy we get from the sun.
A substellar companion at that
distance would imply an
orbital period of
around a year, or it could be in a highly eccentric orbit with a much greater average
distance from Proxima.
Giant stars Aa and Ab are separated by less than the Earth - Sun
orbital distance (
around 0.73 AU).
At that
distance from the star, such a planet would have an
orbital period of about 124 days, or
around a third of an Earth year.
The
distance from Vega where an Earth - type planet would be «comfortable» with liquid water is centered
around 7.1 AU — between the
orbital distances of Jupiter and Saturn in the Solar System.
An Earth - type planet could have liquid water in a stable orbit centered
around 0.036 AU from Star B — well within the
orbital distance of Mercury in the Solar System.
If so, then conditions would be more favorable for the existence of stable orbit for an Earth - like planet (with liquid water) centered
around 1.5 AU from
around Iota Persei —
around the
orbital distance of Mars in the Solar System.
At that
distance from the star, such a planet would have an
orbital period of
around 4.7 Earth years.
An Earth - type planet could have liquid water in a stable orbit centered
around 1.18 AU from Star A — between the
orbital distances of Earth and Mars in the Solar System.
The orbit of an Earth - like planet (with liquid water)
around close - orbiting Stars A and B may be centered as close as 1.06 AU — between the
orbital distances of Earth and Mars in the Solar System — with an
orbital period of over 384 days (1.05 years).
In any case, a circumbinary
orbital distance from CM Draconis Aab where an Earth - type planet would be comfortable with liquid water would be centered
around 0.3 AU, with a «year» of 18 to 35 days.
At their closest approach, Stars A and B are about two AUs farther apart than the average
orbital distance of Saturn
around the Sun, while their widest separation is still about six AUs farther the average
orbital distance of Neptune.
Calculations by to Weigert and Holman (1997) indicated that the
distance from the star where an Earth - type planet would be «comfortable» with liquid water is centered
around 0.73 to 0.74 AU — somewhat beyond the
orbital distance of Venus in the Solar System — with an
orbital period under an Earth year using calculations based on Hart (1979).
For an Earth - type planet
around HD 189733 A to have liquid water at its surface, it would need a stable orbit centered
around 0.5 AU — between the
orbital distances of Mercury and Venus in the Solar System (with an
orbital period
around 150 days assuming a stellar mass
around 82 percent of Sol's.
A planet with at least 5.7 Earth - masses has been found in orbit
around Star C of triple - star system MLO 4 at an
orbital distance of only 0.05 AUs (more info and video).
Calculations by to Weigert and Holman (1997) indicated that the
distance from the star where an Earth - type planet would be «comfortable» with liquid water is centered
around 1.25 AUs (1.2 to 1.3 AUs)-- about midway between the orbits of the Earth and Mars in the Solar System — with an
orbital period of 1.34 years using calculations based on Hart (1979).
Their simulations suggest that at least one planet in the one to two Earth - mass range could have formed within
orbital distances of 0.5 to 1.5 AUs
around both heavy - element - rich stars; of particularly note, the simulations frequently generated a Earth - like planet in or near Star B's habitable zone (where liquid water could exist on the planet's surface).
However, owing to the relatively large
orbital distances of the currently known NIR stars
around Sgr ~ A *, there have been no dynamical measurements of its spin magnitude or orientation.
Planet «b» completes an inner orbit
around BD +26 2184 in 9.494 + / - 0.995 days at an average
orbital distance of 0.0831 + / - 0.0011 AU.
If you include infrared radiation, the orbit of an Earth - like planet with surface water would be centered
around 0.57 AU — between the
orbital distances of Mercury and Venus in the Solar System.
The orbit of an Earth - like planet (with liquid water)
around this star would be centered
around 1.14 AU — somewhat outside the
orbital distance of Earth in the Solar System — with an
orbital period of about one and a quarter of an Earth year.
Based on its estimated bolometric luminosity, the
distance from HR 4523 A where an Earth - type planet would be «comfortable» with liquid water is centered
around 0.88 AU — between the
orbital distance of Venus and Earth in the Solar System, with an
orbital period about 330 days, or about 90 percent of an Earth year.
Hence, planet b's average
orbital distance of
around 2.1 AUs places its orbit at
around the outer edge of the habitable zone at
around.
In any case, the orbit of an Earth - like planet (with liquid water)
around Zeta2 would have to be centered at
around one AU — the
orbital distance Earth in the Solar System — with an
orbital period of just over a year.
Lastly, there may be an additional third planet «d,» which may have
around 54 percent of Jupiter's mass and an average
orbital distance of
around 3 AUs with a period of
around 6 years (2,172 + / - 158 and an eccentricity near 0.48.
The
orbital distance from Gamma Pavonis where an Earth - type planet would be «comfortable» with liquid water is centered
around 1.2 AU — between the
orbital distances of Earth and Mars in the Solar System.
Moving outwards from host star, planet «c» has 72 percent of Jupiter's mass and an
orbital period of 2.8 years (1,024 days) with an average
orbital distance of 1.76 AUs and eccentricity
around 0.28.
The
distance from Star A where an Earth - type planet would be «comfortable» with liquid water is centered
around only 0.56 AU — between the
orbital distances of Mercury and Venus in the Solar System.
Around dimmer Zeta1, the orbit of an Earth - like planet would be closer in around 0.9 AU — between the orbital distances of Venus and Earth in the Solar System — with an orbital period of around 320
Around dimmer Zeta1, the orbit of an Earth - like planet would be closer in
around 0.9 AU — between the orbital distances of Venus and Earth in the Solar System — with an orbital period of around 320
around 0.9 AU — between the
orbital distances of Venus and Earth in the Solar System — with an
orbital period of
around 320
around 320 days.
If so, then conditions would be more favorable for the existence of stable orbit for an Earth - like planet (with liquid water) centered
around 1.15 AU from
around 15 Sge — between the
orbital distances of Earth and Mars in the Solar System.
Assuming that the spectroscopic companion B does not preclude a stable inner planetary orbit, the
distance from Star A where an Earth - type planet would be «comfortable» with liquid water is centered
around only 0.457 AU — between the
orbital distances of Mercury and Venus in the Solar System.
This star is located about 224 AUs away on average (a semi-major axis of 14.39» at a HIPPARCOS
distance of 50.87 light - years) with an
orbital period
around 2,000 years and an extremely high
orbital eccentricity of 0.91.
It moves
around Star A at an average
distance of less than 0.05 AUs (a semi-major axis well within Mercury's
orbital distance) in a near circular orbit (e = 0.23 + / - 0.015) that takes 3.312 days to complete.
The
distance from Beta Comae Berenices where an Earth - type planet would be «comfortable» with liquid water may be centered
around 1.2 AU — between the
orbital distances of Earth and Mars in the Solar System with an
orbital period of 1.29 Earth Years.
If so, then conditions would be more favorable for the existence of stable orbit for an Earth - like planet (with liquid water) centered
around 1.12 AU from
around 37 Gem — between the
orbital distances of Earth and Mars in the Solar System.
It moves
around Star A at an average
distance of 0.35 AUs (a semi-major axis inside the
orbital distance of Mercury) in an elliptical orbit (e = 0.21) that takes about 75.6 days to complete.
The
distance from Kappa Ceti where an Earth - type planet would be «comfortable» with liquid water is centered
around only 0.92 AU — between the
orbital distances of Earth and Venus in the Solar System.
The orbit of an Earth - like planet (with liquid water)
around Star A may be centered as close as 1.8 AU — between the
orbital distances of Mars and the Main Asteroid Belt in the Solar System — with an
orbital period of 2.2 years.
Today, the
distance from Delta Eridani where an Earth - type planet would be «comfortable» with liquid water is centered
around 1.7 AU — beyond the
orbital distance of Mars in the Solar System.
At that
distance from Epsilon Indi and assuming that it has 0.77 Solar - mass, such a planet would have an
orbital period of
around 199 days (or a bit over half an Earth year).
The
distance from the star where an Earth - type planet could have liquid water on its surface is centered
around 0.611 AU — between the
orbital distances of Mercury and Venus in the Solar System.
At the planet's
orbital distance of only 0.014 AU from its host star, however, the surface temperature has been estimated to be
around 400 ° Fahrenheit (200 ° Celsius), which is way too hot for liquid water.
The
distance from Chi1 Orionis A where an Earth - type planet would be «comfortable» with liquid water is centered within 1 AU —
around inside the
orbital distance of Earth in the Solar System.
For an Earth - type planet, the
orbital distance where it would have liquid water zone on its surface would be
around 0.884 AU, where the
orbital period would be 392 days (1.073 years) if the star actually does have
around 60 percent of a Solar - mass.