KerbalEDU Exploration of TRAPPIST-1 ( Principia variation of SLIPPIST-1 )

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Where Planet Years are only a few Earth Days...more like Jupiter & its large moons.

1.5 b,  2.4 c,  4.1 d,  6.1 e,  9.2 f,  12.4 g,  18.8 h 

Earth days per "year"yrpS2HG.png?1


This "Topic" is an invitation to join an exploration of the TRAPPIST-1 system ...students, teachers, KSP players all welcome to share fun & significant TRAPPIST-1 related insights...

  • missions you build either for SLIPPIST-1 or TRAPPIST-1,
  • a place to share your explorations of this exoplanet  system,
  • contrasts with Jupiter or Pluto moon systems in KSP RSS Principia, e.g. orbit transfers, etc.,
  • cool research you discover about this system,
  • remarkable moments encountered while exploring this model system in Kerbal,
  • etc, focus on creating together a fun & educational concentration of information about TRAPPIST-1 & our exploration of it.

NASA JPL: TRAPPIST-1 Compared to Jovian Moons and Inner Solar System - Updated Feb. 2018


"All seven planets discovered in orbit around the red dwarf star TRAPPIST-1 could easily fit inside the orbit of Mercury, the innermost planet of our solar system. In fact, they would have room to spare. TRAPPIST-1 also is only a fraction of the size of our Sun; it isn't much larger than Jupiter. So, the TRAPPIST-1 system's proportions look more like Jupiter and its moons than those of our solar system."


Observe 'actual' planet transits in Kerbal!

For the Principia adjusted version, the epoch start date is  "JD2457000.000000000" =  UTC Noon  Monday 2014 December 08.  Here is an excerpt from the Principia GitHub FAQ:


"The simulation uses the most recently published observational data (from K2 and Spitzer) and is based on a transit-timing variation optimization. It accurately models the real-life behavior of the planetary system: the transits are accurate to within a minute."



@GregroxMun ( SLIPPIST-1 ) & the Principia team @eggrobin & @pleroy

( TRAPPIST-1 for Principia )


a remarkable model of the TRAPPIST-1 system that works well in both 

x64 KerbalEDU & KSP 1.3.1 & 1.4.5 








Save files & Mission links (To_Be_Added):

  • TRAPPIST1_system
  1. stationary 1d orbit
  • Jovian system 
  1. stationary Europa orbit

"This chart shows, on the top row, artist concepts of the seven planets of TRAPPIST-1 with their orbital periods, distances from their star, radii, masses, densities and surface gravity as compared to those of Earth. These numbers are current as of February 2018."  source link


Seven Worlds of SLIPPIST-1, and an Astronomy Lesson on Stars and the Exoplanets around TraPPiST-1

At the above link, Gregrox has written a fun & insightful astronomy lesson with some cool details about the beautiful model images of this system...'almost eyeball' planets & all!...a few excerpts:

  • "You get a hot zone, and then progressively cooler zones down to the night side of frigid temperatures and nothing but ice! You'd have a band of scorching desert, a band of rainforests, a band of tundra, and a massive cap of ice. Or if it's colder and wetter, it can look even more eyeball-like, maybe a cracked frozen ice ball like a huge Europa with a circular sea of melted ice. But these don't account for the fact that real tidally locked exoplanets spin. The Coriolis force drives winds that completely change the climate."
  • "Try to figure out the resonant chain in TRAPPIST-1! Just kidding, I'll tell you. It's in a 24:15:9:6:4:3:2 resonance. Neighboring planets are in 8:5, 5:3, 3:2, 3:2, 4:3, and 3:2 resonances"
sGnb2Zc.png  Gregrox SLIPPIST-1
KerbalEDU x64 1.4.5 Install via CKAN: .
KerbalEDU x64 1.3.1 Install Instructions, SLIPPIST-1 & Principia mod page links, & additional useful Mod lists (see hidden contents):

Essential MODs:

  • PRINCIPIA REQUIRES x64 version of KerbalEDU or KSP
  • KSP page for SLIPPIST-1
  1. Kopernicus
  2. Kopernicus Expansion Continued

Many Useful Optional MODs see CKAN file or the list at the google doc links below:


KerbalEDU 1.3.1 Install Instructions for SLIPPIST-1 & conversion to TRAPPIST-1:

Install Instructions for SLIPPIST-1 & conversion to TRAPPIST-1

Link to the original instruction post: 




You'll want to use version 0.6.0 with KSP 1.3.1. All you need to do to make sure the game is installed correctly is the following:

  • Install Kopernicus from THIS direct download link.
  • Install Kopernicus Expansion Continued--Regional PQSMods from THIS direct download link.
  • (OPTIONAL) Install E.V.E. version for 1.3.1, only the plugin. Do NOT download the configs, SLIPPIST-1 has its own.
  • (OPTIONAL) Install Scatterer version for 1.3.1.
  • Download the KSP 1.4.x version of SLIPPIST-1 (v0.6.0)
  • Unzip the folder and install only SLIPPIST-1 into gamedata, do not install the newer version of Kopernicus Expansion.

(In short, install Kopernicus and Kopernicus Expansions Regional PQSMods for 1.3.1, making sure not to overwrite Kopernicus Expansions when you install SLIPPIST-1.

ADDITIONAL Principia Install instructions To  ADD  Principia to make the SLIPPIST-1 model quite accurately reflect the observed transit timings with the epoch start date "JD2457000.000000000" =  UTC Noon  Monday 2014 December 8 
Install the most current release of Principia from the link to the right
ADD to your GameData  folder the "Trappist-1 for Principia" folder download available from the  link to the right,-reporting-bugs,-and-frequently-asked-questions#installing-trappist-1-for-principia




Edited by AloE
WIP updates
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StarryNight7 suggests that the plane of the planet orbits in the TRAPPIST-1 system appears to be about perpendicular to the plane of the Earth traveling around the Sun. 

The Sun is ~40ly in the distance slightly left above image center & the pink ~horizontal  line approximates the orientation of Earth's orbit around the sun:


TRAPPIST-1 'near' the Moon in the sky

Some times, like on 2018 September 23, 

the Moon passes near line of sight for an observer on Earth towards the Trappist-1 system: 

(click image to see detail)OhEJFg2.png


Edited by AloE
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NASA artists suggest planets as Earth like 'apparent view' sized moons in the sky viewed from some planets in the TRAPPIST-1 system...but the NASA painting is a bit exaggerated ;-)

Indeed at some points in the orbits especially for planets 1c & 1d, planet 1b is over 2x the apparent size of our moon & the sun TRAPPIST-1 nearly 10x the apparent diameter of Earth's Moon & Sun...the views of TRAPPIST-1 solar transits, of large crescent 'planet' phases near greatest elongation, & of some of the planets going from brilliant 'dot sized' to as large in the sky as we see our Moon from Earth in just a day or so are highlights for tourists in orbit of 1c :-) 

However, closer to home, the view of Jupiter from Io as well as Io & Jupiter from Europa would be stunning...especially for the 2032 March 20 Jupiter tipple shadow transit!  Even just the 3 shadows would barely fit into the field of view of 7x50 binoculars!  The apparent diameter of Jupiter being a gorgeous equivalent to ~30 Earth's sky apparent Moon diameters.

Animated gif below alternates views from TRAPPIST 1c & view from Io...many more detailed StarryNight7 & Kerbal images in the album at:






Edited by AloE

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KSP TRAPPIST1 for Principia video comparison with published planet transit data.  Considering the opportunity to create KSP 'observatories' as well as 'tourist' colonies to explore 'real' events in KerbalEDU...

and experience the differences between the Jovian & TRAPPIST1 systems.

TRAPPIST1 planet 1b is about 45 minutes early compared to published data...whereas planets 1c,1d,1e,1f,1g,1h transit within a few minutes of published observations for late 2016.  I have asked the Principia team about 1b.

This is very initial ground work for Principia RSS & TRAPPIST1 & KerbalEDU in 1.4.5 so that a few highlight missions can be created to make it easier to compare the two systems in KerbalEDU e.g. Calisto & 1b.

KSP 1.4.5 TRAPPIST1 Planet Transits & KerbalEDU 1.3.1 2032 Jupiter Triple Shadow Transit 1080p captures

Considerations about Tides:

exo-planet tides. "Implications of tides for life on exoplanets"

heating: "Magma oceans and enhanced volcanism on TRAPPIST-1 planets due to induction heating" & "Interior structures and tidal heating in the TRAPPIST-1 planets"


Edited by AloE
fix links & update

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