Difference between revisions of "Tutorial:How to get to Minmus"

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This tutorial will attempt to teach you how to get to [[Minmus]].  It assumes that you have successfully completed a trip to [[Mun|The Mun]], if you haven't I suggest you [[Mun Landing|check out the tutorial]].
 
This tutorial will attempt to teach you how to get to [[Minmus]].  It assumes that you have successfully completed a trip to [[Mun|The Mun]], if you haven't I suggest you [[Mun Landing|check out the tutorial]].
 +
 +
Click [[Tutorial:Mun For Dummies|here]] for a more up-to-date version of the Mun tutorial.
  
 
==Introduction==
 
==Introduction==
  
Landing on Minmus is almost identical to landing on the Mun, with a few minor exceptions:
+
Landing on Minmus is similar to landing on the Mun, with a few minor exceptions:
  
 
# Minmus is further from [[Kerbin]] than the Mun, which means:
 
# Minmus is further from [[Kerbin]] than the Mun, which means:
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#*Landing on, and achieving orbit from Minmus is significantly easier due to lower gravity, requiring much less fuel.
 
#*Landing on, and achieving orbit from Minmus is significantly easier due to lower gravity, requiring much less fuel.
 
#*Its Sphere of Influence (SOI) is smaller, which (plus the distance) requires more precision.
 
#*Its Sphere of Influence (SOI) is smaller, which (plus the distance) requires more precision.
#Minmus has a more eccentric orbit, which means:
+
#*Its gravity is low enough that [[Reaction Control System]] alone is enough to correct a smaller spacecraft if it has been tipped over.
 +
#Minmus has an inclined orbit, which means:
 
#*Direct injection has a higher failure rate.
 
#*Direct injection has a higher failure rate.
 
#*Matching orbits requires a little extra knowledge about adjusting orbital inclination (and fuel).
 
#*Matching orbits requires a little extra knowledge about adjusting orbital inclination (and fuel).
 +
#Minmus is not tidally locked to Kerbin which means.
 +
#*More precision is needed when using direct injection when trying to land on a selected location.
  
 
==Constructing a Minmus Rocket==
 
==Constructing a Minmus Rocket==
  
===*The Upper Stage (Lander)===
+
===The Upper Stage (Lander)===
  
 
This stage should be much lighter than the one you would use to reach The Mun.  Landing on Minmus and returning to Kerbin only requires about as much fuel put together as the landing phase of a Mun visit.
 
This stage should be much lighter than the one you would use to reach The Mun.  Landing on Minmus and returning to Kerbin only requires about as much fuel put together as the landing phase of a Mun visit.
  
===*The Middle Stage (Transfer Burn)===
+
===The Middle Stage (Transfer Burn)===
  
 
Take advantage of the weight you have saved on your lander to pack more fuel for this one.  You will need it for the trip between Kerbin and Minmus.
 
Take advantage of the weight you have saved on your lander to pack more fuel for this one.  You will need it for the trip between Kerbin and Minmus.
  
===*The Lower Stage (Launch)===
+
===The Lower Stage (Launch)===
  
 
This stage should not be much different than the one you would use on a Mun attempt.  If you are not feeling confident about your middle stage, it never hurts to pack a little more fuel/thrust.
 
This stage should not be much different than the one you would use on a Mun attempt.  If you are not feeling confident about your middle stage, it never hurts to pack a little more fuel/thrust.
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==Minmus Injection==
 
==Minmus Injection==
  
Similar to the Mun guide, wait until Minmus is about 4-5 degrees over the horizon to begin your burn.  It will appear as a small dot above the horizon.  Burn until your apoapsis intersects Minmus' orbit, and (hopefully) you will be caught.
+
While it may not be absolutely necessary, [[Basic_maneuvers#Match_Orbital_Inclination|matching your orbital inclination]] with Minmus makes it much easier to get caught in its SOI. Set Minmus as your target and burn perpendicular to your orbital plane at one of the nodes until they read '0.0' or 'NaN'.
 +
 
 +
Similar to the Mun guide, wait until Minmus is about 4-5 degrees over the horizon (20-40 degrees in the map) to begin your burn.  It will appear as a small dot above the horizon.  Burn until your apoapsis intersects Minmus' orbit, and (hopefully) you will be caught. Alternatively, you could also burn until your apoapsis intersects Minmus's orbit without changing your inclination. You probably won't see an encounter, so to fix your inclination for much cheaper, halfway to the apoapsis burn antinormal to drag it down until you see an encounter. This takes less thrust and is more efficient.
  
 
==Landing on Minmus==
 
==Landing on Minmus==
  
Your orbit, retrograde burn, and landing will all be at much lower speeds than they would be at either the Mun or Kerbin.  In fact, it's unlikely that you will (or should) reach speeds above 100m/s at any point near Minmus.  Try aiming for [[Minmus#Topography|a frozen lake]] if you are looking for an easier landing, close to chart datum. Munmus' large mountain ranges make for more of a challenge elsewhere on the surface.
+
Your orbit, retrograde burn, and landing will all be at much lower speeds than they would be at either the Mun or Kerbin.  In fact, it's unlikely that you will (or should) reach speeds above 100 m/s at any point near Minmus.  Try aiming for [[Minmus#Topography|a frozen lake]] if you are looking for an easier landing, close to chart datum. Minmus' large mountain ranges make for more of a challenge elsewhere on the surface. And no, it's not a big ice cream!
  
 
==Returning to Kerbin==
 
==Returning to Kerbin==
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===Basic method===
 
===Basic method===
 
This is a crude but effective method, using slightly more fuel than the [[Tutorial:How to get to Minmus#Returning to Kerbin#Advanced method|advanced method]] below.
 
This is a crude but effective method, using slightly more fuel than the [[Tutorial:How to get to Minmus#Returning to Kerbin#Advanced method|advanced method]] below.
Begin a light burn until you escape Minmus' SOI, then apply retrograde thrust until your periapsis is below 65km altitude on Kerbin.  Happy Landings!
+
Begin a light burn until you escape Minmus' SOI, then apply retrograde thrust until your periapsis is below 65 km altitude on Kerbin.  Happy Landings!
  
 
===Advanced method===
 
===Advanced method===
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* Burn to raise the apoapsis to around 10,000m.
 
* Burn to raise the apoapsis to around 10,000m.
* Burn Easterly to achieve a low equatorial orbit.
+
* Burn prograde at apoapsis to achieve a low equatorial orbit.
* When the craft is ahead of the moon in its orbit, burn again to escape velocity, ensuring to stop the burn early.
+
* When the craft is moving retrograde relative to Minmus's orbit around Kerbin, face prograde and burn again to escape velocity.
* You will now be on a [[Tutorial:Free Return Trajectory|"free return"]] type of trajectory to Kerbin. You will not need to burn again to re-enter the planet's atmosphere.
+
* Keep burning until your periapsis around Kerbin is below 32,000m.
 +
* You will now be on a trajectory towards Kerbin. You will not need to burn again to re-enter the planet's atmosphere.
  
 
==See also==
 
==See also==
 +
* [[Tutorial:Mun For Dummies|Mun For Dummies: Travelling to the Mun and Back]] by nicnacnic (For Version 1.0 to 1.2)
 
* [[Mun Landing]]
 
* [[Mun Landing]]
 
* [[How to get to Eve]]
 
* [[How to get to Eve]]
 
* [[Tutorials]]
 
* [[Tutorials]]
  
[[Category:Tutorials]]
+
[[Category:Tutorials|How to get to Minmus]]

Latest revision as of 20:15, 2 May 2019

This tutorial will attempt to teach you how to get to Minmus. It assumes that you have successfully completed a trip to The Mun, if you haven't I suggest you check out the tutorial.

Click here for a more up-to-date version of the Mun tutorial.

Introduction

Landing on Minmus is similar to landing on the Mun, with a few minor exceptions:

  1. Minmus is further from Kerbin than the Mun, which means:
    • More fuel is required from the trip between Kerbin's orbit and Minmus.
    • It has a slower orbit, making intercept velocities lower.
  2. Minmus is significantly smaller than The Mun, which means:
    • Landing on, and achieving orbit from Minmus is significantly easier due to lower gravity, requiring much less fuel.
    • Its Sphere of Influence (SOI) is smaller, which (plus the distance) requires more precision.
    • Its gravity is low enough that Reaction Control System alone is enough to correct a smaller spacecraft if it has been tipped over.
  3. Minmus has an inclined orbit, which means:
    • Direct injection has a higher failure rate.
    • Matching orbits requires a little extra knowledge about adjusting orbital inclination (and fuel).
  4. Minmus is not tidally locked to Kerbin which means.
    • More precision is needed when using direct injection when trying to land on a selected location.

Constructing a Minmus Rocket

The Upper Stage (Lander)

This stage should be much lighter than the one you would use to reach The Mun. Landing on Minmus and returning to Kerbin only requires about as much fuel put together as the landing phase of a Mun visit.

The Middle Stage (Transfer Burn)

Take advantage of the weight you have saved on your lander to pack more fuel for this one. You will need it for the trip between Kerbin and Minmus.

The Lower Stage (Launch)

This stage should not be much different than the one you would use on a Mun attempt. If you are not feeling confident about your middle stage, it never hurts to pack a little more fuel/thrust.

Launching Into Kerbin's Orbit

Same as any standard launch, presumably on a much larger scale. Read the tutorial for how to reach orbit if you haven't already figured it out.

Minmus Injection

While it may not be absolutely necessary, matching your orbital inclination with Minmus makes it much easier to get caught in its SOI. Set Minmus as your target and burn perpendicular to your orbital plane at one of the nodes until they read '0.0' or 'NaN'.

Similar to the Mun guide, wait until Minmus is about 4-5 degrees over the horizon (20-40 degrees in the map) to begin your burn. It will appear as a small dot above the horizon. Burn until your apoapsis intersects Minmus' orbit, and (hopefully) you will be caught. Alternatively, you could also burn until your apoapsis intersects Minmus's orbit without changing your inclination. You probably won't see an encounter, so to fix your inclination for much cheaper, halfway to the apoapsis burn antinormal to drag it down until you see an encounter. This takes less thrust and is more efficient.

Landing on Minmus

Your orbit, retrograde burn, and landing will all be at much lower speeds than they would be at either the Mun or Kerbin. In fact, it's unlikely that you will (or should) reach speeds above 100 m/s at any point near Minmus. Try aiming for a frozen lake if you are looking for an easier landing, close to chart datum. Minmus' large mountain ranges make for more of a challenge elsewhere on the surface. And no, it's not a big ice cream!

Returning to Kerbin

Basic method

This is a crude but effective method, using slightly more fuel than the advanced method below. Begin a light burn until you escape Minmus' SOI, then apply retrograde thrust until your periapsis is below 65 km altitude on Kerbin. Happy Landings!

Advanced method

This method is cheaper on fuel.

  • Burn to raise the apoapsis to around 10,000m.
  • Burn prograde at apoapsis to achieve a low equatorial orbit.
  • When the craft is moving retrograde relative to Minmus's orbit around Kerbin, face prograde and burn again to escape velocity.
  • Keep burning until your periapsis around Kerbin is below 32,000m.
  • You will now be on a trajectory towards Kerbin. You will not need to burn again to re-enter the planet's atmosphere.

See also