55 Cancri e, also known as Janssen, orbits a star – Earthtopomaps

55 Cancri e , also known as Janssen , orbits a star

DISCOVERED 2004

PLANET TYPE: Super Earth

55 Cancri e , also known as Janssen , orbits a star called Copernicus only 41 light years away.

The molten surface is completely uninhabitable, but above the burning horizon, Janssen’s sister planet, Galileo, hangs in a dark sky. Silicates in the atmosphere would condense into clouds on the tidally-locked planet’s darkside reflecting the lava below. So, the skies would sparkle.

55 Cancri e , also known as Janssen , orbits a star

55 Cancri e is a super-Earth exoplanet that orbits a G-type star similar to our Sun. Its mass is 8.08 Earths, it takes 0.7 days to complete one orbit of its star, and is 0.01544 AU from its star. Its discovery was announced in 2004.

A) ORBITAL RADIUS 0.01544AU

B) ORBITAL PERIOD 0.7 days

C) ORBITAL ECCENTRICITY 0.05

Planet Comparison 55 Cancri eEarth MASS7.99 Earths RADIUS1.875 x Earth

Star Comparison 55_CncOur Sun MASS0.91 x Our Sun RADIUS0.94 x Our Sun

How long to Travel Here from Earth?

TRAVEL SPEED 60 Miles per hour

TRAVEL TIME 459 Million years

Detection Method: Radial Velocity

The radial velocity method measures slight changes in a star’s velocity as the star and the planet move about their common center of mass. Astronomers can detect these variances by analyzing the spectrum of starlight. In an effect known as Doppler shift, light waves from a star moving toward us are shifted toward the blue end of the spectrum. If the star is moving away, the light waves shift toward the red end of the spectrum. This happens because the waves become compressed when the star is approaching the observer and spread out when the star is receding. The effect is similar to the change in pitch we hear in a train’s whistle as it approaches and passes.

Observed By:

55 Cancri e
55 Cancri e

McDonald Observatory

Source: Exoplanets Nasa Gov exoplanet catalog

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Super Earth K2 18 B is a Super Earth exoplanet

55 Cancri e, also known as Janssen, orbits a star. 55 Cancri e, also known as Janssen, orbits a star called Copernicus only 41 light years away. The molten surface is completely uninhabitable, but above the burning horizon, Janssen’s sister planet, Galileo, hangs in a dark sky. So, the skies would sparkle. 55 Cancri e, also known as Janssen, orbits a star. This happens because the waves become compressed when the star is approaching the observer and spread out when the star is receding.

Super Earth K2-18 b is a super Earth exoplanet

Super Earth K2-18 b is a super Earth exoplanet

Super Earth K2-18
Super Earth K2-18

DISCOVERED 2015 K2-18 b

PLANET TYPE Super Earth

K2-18 b is a super Earth exoplanet that orbits an M-type star. Its mass is 8.92 Earths. It takes 32.9 days to complete one orbit of its star. And is 0.1429 AU from its star. Its discovery was announced in 2015.

Super Earth K2-18 b is a super Earth exoplanet

A) ORBITAL RADIUS 0.1429AU

B) ORBITAL PERIOD 32.9 days

C) ORBITAL ECCENTRICITY 0.2

Planet Comparison K2-18 b Earth MASS8.92 Earths RADIUS2.37 x Earth

Star Comparison K2-18 Our Sun MASS0.36 x Our Sun RADIUS0.41 x Our Sun

How long to Travel Here from Earth ?

TRAVEL SPEED 60 Miles per hour

TRAVEL TIME 1 Billion years

AUTO BULLET TRAIN JET VOYAGER LIGHT SPEED

Detection Method: Transit

If a planet passes directly between a star and an observer’s line of sight. It blocks out a tiny portion of the star’s light. Thus reducing its apparent brightness. Sensitive instruments can detect this periodic dip in brightness. From the period and depth of the transits. The orbit and size of the planetary companions can be calculated. Smaller planets will produce a smaller effect, and vice-versa. A terrestrial planet in an Earth-like orbit, for example, would produce a minute dip in stellar brightness that would last just a few hours.

Observed By

Super Earth K2-18
Super Earth K2-18

K2

K2-18 b is a super Earth exoplanet

In 2019 the presence of water vapour in K2-18b’s atmosphere was discovered, drawing attention to this system. Its atmosphere may have an unexpectedly small concentration of methane, although observation uncertainties preclude a definitive determination. K2-18b has been studied as a potential habitable word that, temperature aside, resembles more a gas planet like Uranus or Neptune than Earth.

If a planet passes directly between a star and an observer’s line of sight. It blocks out a tiny portion of the star’s light.

Super Earth K2-18 b is a super Earth exoplanet

Source: En Wikipedia org wiki K2-18b

Source: Exoplanet K2-18 b

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Earth to exoplanet hunting for planets

G) Thus reducing its apparent brightness. A terrestrial planet in an Earth-like orbit, for example, would produce a minute dip in stellar brightness that would last just a few hours. Its atmosphere may have an unexpectedly small concentration of methane, although observation uncertainties preclude a definitive determination. K2-18b has been studied as a potential habitable word that, temperature aside, resembles more a gas planet like Uranus or Neptune than Earth.

H) Thus reducing its apparent brightness. A terrestrial planet in an Earth-like orbit, for example, would produce a minute dip in stellar brightness that would last just a few hours. Its atmosphere may have an unexpectedly small concentration of methane, although observation uncertainties preclude a definitive determination. K2-18b has been studied as a potential habitable word that, temperature aside, resembles more a gas planet like Uranus or Neptune than Earth.

I) Thus reducing its apparent brightness. A terrestrial planet in an Earth-like orbit, for example, would produce a minute dip in stellar brightness that would last just a few hours. Its atmosphere may have an unexpectedly small concentration of methane, although observation uncertainties preclude a definitive determination. K2-18b has been studied as a potential habitable word that, temperature aside, resembles more a gas planet like Uranus or Neptune than Earth.

I) Thus reducing its apparent brightness. A terrestrial planet in an Earth-like orbit, for example, would produce a minute dip in stellar brightness that would last just a few hours. Its atmosphere may have an unexpectedly small concentration of methane, although observation uncertainties preclude a definitive determination. K2-18b has been studied as a potential habitable word that, temperature aside, resembles more a gas planet like Uranus or Neptune than Earth.

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Super Earth K2-18
Super Earth K2-18

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Super Earth K2-18
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Super Earth K2-18
Super Earth K2-18

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