Specific physical data for Minmus?

avan · May 18, 2012

I was wondering if anyone has all the specific physical data for it, like exists for the Mun and Kerbin?

Also, what are the highest mountains on it, relative to its \'sea level\' (0-altitude)?

[The following list I just copied/pasted from the Mun\'s article on the wiki, and removed the data values]

Equatorial Radius: ?? km

Mass: ??x10^?? kg

Surface Gravity: ?? m/s^2 or ??G

Gravitational parameter: ?? km^3/s^2

Escape velocity from surface: ?? m/s

Rotation Period: ?? hours; Rotation: ?? degrees per hour, or ?? m/s

Theoretical Selensynchronous Orbit altitude: ?? m; Selenstationary Orbit velocity: ?? m/s

Orbital Characteristics

Parent Body: Kerbin

Semi-Major Axis: ?? km

Velocity: ??

Orbital Period: ?? hours, ?? minutes, ?? seconds

Sphere of influence: ~ ?? km or ?? body radii

Inclination: ?? degrees

Candre · May 18, 2012

SMA: 47,000km

Velocity: 274.1m/s

I think the radius is 60km; I looked at the persistence file after I landed for the first time.

avan · May 18, 2012

Derp, just realized it replaced all the

???

with ???... will fix that now.

Kosmo-not · May 18, 2012

From my calculations:

radius: 60km

gravitational parameter: 2.829 km^3/s^2

surface gravity: 0.7858 m/s^2

Mass: 4.239e19

Escape velocity from surface: 307m/s

Correct me if I\'m wrong on any of this.

deadshot462 · May 18, 2012

Don\'t have numbers, but Minmus is tidally locked to Kerbin, so it always face the same way towards Kerbin.

UmbralRaptor · May 18, 2012

It\'s full of question marks because that\'s all the data I had. Kosmo-not\'s mass and gravitational parameter figures seem right for one way I tried to get them, but I got 1.35e19 kg from another way. o_O

The 60 km radius was mentioned in the forums, and I\'m measuring something similar.

@Candre: er, the map screen figures are altitudes. Don\'t forget to add Kerbin\'s radius. (So the SMA is 47e6 m)

Trekkin · May 18, 2012

I believe we know the inclination to be 15 degrees.

Also, what\'s the adjective for things relating to Minmus? If the Mun is Munar...

UmbralRaptor · May 18, 2012

Data provisionally added to the (temporary) wiki. I\'ll want to try a few more orbits to confirm things. >_>

Also, what\'s the adjective for things relating to Minmus? If the Mun is Munar...

Minimal? =P

thorfinn · May 18, 2012

I was wondering if anyone has all the specific physical data for it, like exists for the Mun and Kerbin?

I had prepared a table during experimentals, then Squad changed Minmus because PQS was having trouble ^^ (Also, the ultra-low gravity was making people impatient... landings were veeery slow.)

I\'ll post it anyway for 'historical reference'... the only changes from it should be, now the surface gravity is doubled and the radius is 60 kilometers. Other parameters follow accordingly. I\'ll check for myself in the following days, though...

[glow=red,2,300]Old astronomical table:[/glow]

[table]

[tr]

[td] [/td][td]Kerbin[/td][td]Mun[/td][td]Minmus[/td][td]Kerbol[/td]

[/tr]

[tr]

[td]

Mass (kg)

[/td][td]5.29x10²² [/td][td]9.76x10²⁰ [/td][td]1.836(5)x10¹⁸ [/td][td]1.75x10²⁸ [/td]

[/tr]

[tr]

[td]

Radius (km)

[/td][td]600[/td][td]200[/td][td]25[/td][td]65400[/td]

[/tr]

[tr]

[td]

Density (g/cm³)

[/td][td]58.5[/td][td]29[/td][td]28[/td][td]---[/td]

[/tr]

[tr]

[td]

Surface gravity (m/s²)

[/td][td]9.81[/td][td]1.63[/td][td]0.196[/td][td]273[/td]

[/tr]

[tr]

[td]

Escape velocity (m/s)

[/td][td](3430)[/td][td]806[/td][td]99[/td][td](188900)[/td]

[/tr]

[tr]

[td]

Safe orbit period (minutes)

[/td][td]30.5[/td][td]38.1[/td][td]45[/td][td]??[/td]

[/tr]

[tr]

[td]

Semimajor axis (km)

[/td][td]13.5998x10⁶ [/td][td]12000[/td][td]47000[/td][td]N/A[/td]

[/tr][tr]

[td]

Eccentricity

[/td][td]zero[/td][td]zero[/td][td]zero[/td][td]N/A[/td]

[/tr]

[tr]

[td]

Inclination

[/td][td]zero[/td][td]zero[/td][td]6Â°[/td][td]N/A[/td]

[/tr]

[tr]

[td]

Orbital period

[/td][td]106d17h[/td][td]38h36m[/td][td]299h18m[/td][td]N/A[/td]

[/tr]

[tr]

[td]

Rotational period

[/td][td]6h[/td][td]~41h[/td][td]still?[/td][td]??[/td]

[/tr]

[/table]

[glow=red,2,300]Official 0.15.0 astronomical table (data courtesy of UmbralRaptor)[/glow]

[table]

[tr]

[td] [/td][td]Kerbin[/td][td]Mun[/td][td]Minmus[/td][td]Kerbol[/td]

[/tr]

[tr]

[td]

Mass (kg)

[/td][td]5.29x10²² [/td][td]9.76x10²⁰ [/td][td]4.233(7)x10¹⁹ [/td][td]1.75x10²⁸ [/td]

[/tr]

[tr]

[td]

Radius (km)

[/td][td]600[/td][td]200[/td][td]60[/td][td]65400[/td]

[/tr]

[tr]

[td]

Density (g/cm³)

[/td][td]58.5[/td][td]29[/td][td]47[/td][td]---[/td]

[/tr]

[tr]

[td]

Surface gravity (m/s²)

[/td][td]9.81[/td][td]1.63[/td][td]0.78[/td][td]273[/td]

[/tr]

[tr]

[td]

Escape velocity (m/s)

[/td][td](3430)[/td][td]806[/td][td]307[/td][td](188900)[/td]

[/tr]

[tr]

[td]

Safe orbit period (minutes)

[/td][td]30.5[/td][td]38.1[/td][td]32.7[/td][td]??[/td]

[/tr]

[tr]

[td]

Semimajor axis (km)

[/td][td]13.5998x10⁶ [/td][td]12000[/td][td]47000[/td][td]N/A[/td]

[/tr][tr]

[td]

Eccentricity

[/td][td]zero[/td][td]zero[/td][td]zero[/td][td]N/A[/td]

[/tr]

[tr]

[td]

Inclination

[/td][td]zero[/td][td]zero[/td][td]6Â°[/td][td]N/A[/td]

[/tr]

[tr]

[td]

Orbital period

[/td][td]106d17h[/td][td]38h36m[/td][td]299h18m[/td][td]N/A[/td]

[/tr]

[tr]

[td]

Rotational period

[/td][td]6h[/td][td]~41h[/td][td]~300h??[/td][td]??[/td]

[/tr]

[/table]

mossman · May 18, 2012

Honestly I think I\'d prefer Minmus to be the smaller, 25km comet-like body instead of the larger and current version just because it\'s more different then existing bodies to land on and provides a different set of challenges, as well as giving a taste of what\'s to be expected from asteroids and whatnot in the future.

Candre · May 18, 2012

@Candre: er, the map screen figures are altitudes. Don\'t forget to add Kerbin\'s radius. (So the SMA is 47e6 m)

Yikes. 47,000km it is then!

UmbralRaptor · May 18, 2012

Okay, some data from a mission in orbit around Minmus. (ignore my terrible spelling)

Including the 60 km radius (which seems accurate, when I compare altitudes with in-save SMA), I get:

a = 74007.5 m

T = 2380 s

r = 80216 m

v = 179.6 m/s

To get the gravitational parameter, I averaged the results from:

TÂ² == (4?Â²/?)*aÂ³

vÂ² == ?*(2/r - 1/a)

yielding: 284747099.7197 mÂ³/sÂ²

Using 6.67384e-11 for G gets a mass of 4.23257e19 kg.

Actual precision for ? and m is probably 2-4 significant figures. I\'m still curious about the rotational information, though. >_>

thorfinn · May 18, 2012

Nice work, Raptor. I updated my post.

So the gravity is 0.08 G; Strange, Harv was speaking of 0.04....

UmbralRaptor · May 19, 2012

So I took a few extra measurements to knock down random errors a bit:

I suspect that getting much more precision will require reading data directly out of the game.

DeltaBravo · May 20, 2012

There is a 4km high mountain range facing Kerbin.

tncm · May 20, 2012

Very cool... but the gravity sure does feel to be less than 0.78. It does feel more like the .4 you were referencing. ???

VincentMcConnell · May 22, 2012

I believe the number someone mentioned was as low as .04m/s^2, but that can\'t be right.

The calculations some have done seem to have given better results.

Waterhouse · May 25, 2012

I landed on Minmus and jotted down the six following morning times:

96:17:39

110:22:50

124:23:06

139:00:04

153:00:05

167:00:07

181:09:09

Those are dd:hh:mm, I would\'ve seconds but after T +100 they get displaced.

Using this I get times between 14 days, 6 hours and 14 days on the nose. Using the difference betweeen the first and last observation (and division) I get 14 days, 02 hours and 3 minutes.

This data was brought to you by the brothers Munman, Alan and Fredford Kerman. I hope their spouses see the value in the mission

Specific physical data for Minmus?

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