Upsilon Andromedae d

______________________________________________________________________________________



i recommend downloading to see all detail. also, large file size, sorry if it takes long.

______________________________________________________________________________________


on a roll here! here's another warm jovian planet. i'm really enjoying doing these. spent about 10 hours of time on this mostly tweaking the gas giant and positions of the moons. but i have to say that this is probably the most realistic gas giant planet and moon system i have ever made! i'm really happy with the way it came out and hope that i could make like these in the future, but knowning me that probably won't be easy.

_______________________________________________

Image Self Critique and Description

-here i've depticted the warm super jovian; Upsilon Andromedae d / Majriti. i gave it a deep blue tone with white clouds beneath, which is quite different from my original idea of white with some multicoloured clouds. but it definately came out better, trust me. in actuality the planet is more likely to be whiter with not so much blue and some hints of green. cloud texture was custom made for another planet but worked very well here. the front of the planet is a little too bright, but there wasn't much i could do about that. the shadow came out alot better with less banding which i am glad about, it also looks better with the planet being flattened a bit which i will explain below.

-i did the math and with a mass of 10 jovian masses and age of roughly 3.8 billion years, the planet is likely to have a radius of about 1.03 +/- 0.05 jovian radii. the planet is likely to be quite dense from the gas and so starlight would not penetrate deep into the cloud layers. this would result in a sharper shadow at the terminator which i tried to emulate. the sharper shadow also reduced the banding, so thats another plus.
-i also determined that the planet would have a rotation period estimated at around 4.5 +1.0/-0.25 hours. this rapid rotation would cause the planet to bulge significantly at the equator, however due to the planet's high mass, it is likely to have a huge surface gravity which would help to counteract the bulge and reduce it.

-the moons were a little bit of a pain, i had to completely redo the water moons because they came out horribly. but i fixed them.*obviously it is unknown as to whether or not the planet has moons at this period in time*. for artistic effect i gave the planet 5 major moons; a small dry moon, 2 medium sized water moons and 2 small and cold moons. the total mass of the moon system should be around 0.33 earth masses from models of moon formation, which i tried to stay around.

-using my own calculations and modeling:

moon 1 (just right of planet): dry, volcanic moon with 0.235 earth radii, 0.013 earth masses, orbits at 9.928 planetary radii with an orbital period of 1.190 days.
moon 2 (furthest right of planet): ocean moon with 0.679 earth radii, 0.176 earth masses, orbits at 15.735 planetary radii with an orbital period of 2.375 days.
moon 3 (second left of planet): ocean moon with 0.653 earth radii, 0.140 earth masses, orbits at 24.853 planetary radii with an orbital period of 4.714 days.
moon 4 (furthest left of planet): permafrost moon with 0.457 earth radii, 0.038 earth masses, orbits at 32.872 planetary radii with an orbital period of 7.171 days.
moon 5 (just left of planet): permafrost moon with 0.450 earth radii, 0.030 earth masses, orbits at 42.197 planetary radii with an orbital period of 10.429 days.

all moons orbit near the planet's equator with low eccentricities and inclinations which is to be expected from moons orbiting massive planets.
______________________________________________


you can find out more here:
en.wikipedia.org/wiki/Upsilon_…


so please let your eyes enjoy and leave any comments, favs or critiques,  which are always welcome and appreciated!
________________________________________________________________________________________


Upsilon Andromedae d / Majriti

constellation: ................... Andromedae
distance from earth: ........ 44.25 ly
star's name: ..................... Upsilon Andromedae A / Titawin
star's type: ....................... F8V
star's mass: ...................... 1.270 solar masses
star's radius: ..................... 1.480 solar radii
star's luminosity: .............. 3.570 solar luminosities
star's temperature: ........... 6,074 Kelvin
system's name: ................. Upsilon Andromedae
# stars in system: .............. 2
# planets in system: .......... 4
system's age: ..................... 3.8 billion years

planet's status: ................. confirmed
planet's name: .................. Upsilon Andromedae d / Majriti
planetary class: ................ F - Warm - Jovian - Sudarsky Class II Giant

planet's radius: ................ unknown
planet's mass: .................. 10.19 jovian masses
planet's density: ............... unknown
surface gravity: ................ unknown
rotation period: ................ unknown
average eq. temp: ............. estimated at 218 Kelvin
average stellar flux: .......... 0.568 earth units
# satellites: ....................... unknown

orbital eccentricity: ............ 0.274
orbital distance: ................. 2.550 au
year: .................................. 3.567 earth years
place in system: ................. within conservative habitable zone



Description

Upsilon Andromedae d; now known as Majriti (as of December 2015 via the NameExoWorlds Contest) is a warm jupiter type planet orbiting the sun-like star, Upsilon Andromedae A; now known as Titawin (also via the Name ExoWorlds Contest) about 44 light years away in the constellation of Andromeda. It is the third planet discovered in this system and the third planet from the star.

Majriti has a mass just over 10 times the mass of jupiter which was determined via the radial velocity method, which is also the method used to confirm the planet's existance. The planet's radius is not known though, due to it not transiting it's star as seen from Earth and as such, its density is also unknown, but it can be assumed to be close to that of jupiter due to interior models of gas giants, where electron degeneracy pressure causes planets with masses greater than jupiter's to compress due to gravity. Due to it's high mass, it can be assumed that the planet is also accompanied by a group of orbiting moons.

Majriti orbits its star entirely within the conservative habitable zone but with a mildy eccentric orbit. Due to this eccentric orbit, the planet swings from the inner region to the outer region of the zone over the coarse of its orbit. This would lead to large eccentricity induced temperature and seasonal variations over the coarse of the year. The planet is also in a 1:3 mean motion resonance with planet Upsilon Andromedae c / Samh, completing one orbit for every three that Samh make.
Assuming an atmosphere near chemical equilibrium, the planet is likely to be a Sudarsky Class II Gas Giant, with bright white clouds and somewhat bluish in appearance due to high altitude water clouds.

While it is highly unlikely that the planet itself would support life, any large moons in orbit with sufficient atmospheric pressure may have liquid water on their surfaces and may be conducive to life. The planet's mass is also high enough to assume that these moons are high in mass and are rich in water-ice. As such, these moons would have melted in the habitable zone to form ocean moons with deep oceans. These moons would then provide highly conducive environments for the formation and evolution of marine life. The planet would also have an enormous magnetic field which would protect the moons from stellar radiation and outbursts that would strip them of their atmospheres. The moons are also likely to experience tidal heating from gravitation interactions with the giant planet and other moons, warming and keeping their interiors molten. If the moons formed with enough iron in their cores, it is possible that they would generate their own magnetic fields to help further protect them from radiation and atmospheric loss.

__________________________________________________________________________________________


This Artwork is ­­© 2016 Alpha-Element. ALL RIGHTS RESERVED. DO NOT USE THIS ARTWORK!