Hayabusa Project Science Data Archive

[BobHegwood]

What do you mean by 'behave'? It does look different than other asteroids because it's by far the smallest asteroid we have good images of, and I think that this difference in scale makes it's 'rubble pile' nature more evident than in larger asteroids.

Sorry Chris...
Was very curious about the "Rubble Pile" effect, and of course, the asteroid's
unique rotation, its shape and its path through space. That's all I meant.
Was very interesting.

[CAP-Team]

Sorry for kicking this old thread, but I stumbled upon an Itokawa map, but I do not recall where it came from.



Download here

I tried using this as a map for the cmod model but this doesn't seem to work, even though Celestia says it has loaded the texture.

[Hungry4info]

Yeah I'm having the exact same problem.

[chris]

Sorry for kicking this old thread, but I stumbled upon an Itokawa map, but I do not recall where it came from.



Download here

I tried using this as a map for the cmod model but this doesn't seem to work, even though Celestia says it has loaded the texture.

I believe that the Itokawa model in Celestia lacks texture coordinates, and that's why the texture doesn't appear. Adding texture coordinates is possible, though it'd be a little tricky to get the mapping correct in the area where the map wraps. However, this map doesn't appear to show any albedo variations--all the variations in tone are caused by the geometry of the asteroid. Since that's the case, you probably just want a more detailed mesh. You can try one of these:

http://www.celestiaproject.net/~claurel/celest ... 1.cmod.zip
http://www.celestiaproject.net/~claurel/celest ... 2.cmod.zip
http://www.celestiaproject.net/~claurel/celest ... 3.cmod.zip

They have about 200000, 8000000, and three million triangles, respectively. I recommend itokawa2 as a good compromise between performance and detail.

--Chris

[Limax7]

Hi,

I download trajectory data (hayabusa_itokawarendezvous_v01.bsp 16.5 MB)
and Itokawa trajectory (itokawa_1989_2010.bsp 477 KB) and (sb_25143_140.bsp 134 KB)
from: http://naif.jpl.nasa.gov/pub/naif/HAYAB ... /data/spk/

and I have problem to implement this to Celestia

In spkinfo.txt:

Code: Select all

      hayabusa_itokawarendezvous_v01   SPK file containing the
                                       trajectory of the Hayabusa
                                       spacecraft relative to the
                                       asteroid Itokawa based on
                                       spacecraft telemetry data,
                                       covering most of the surveying
                                       and collection phase of the
                                       mission, created at the end of
                                       the phase by the Hayabusa Joint
                                       Science Team.


Code: Select all

Body: HAYABUSA (-130)* w.r.t. ITOKAWA (2025143)
      Start of Interval (ET)              End of Interval (ET)
      -----------------------------       -----------------------------
      2005 SEP 10 02:58:30.540            2005 NOV 22 05:48:12.566

Body: HAYABUSA (-130)* w.r.t. ITOKAWA (2025143)
      Start of Interval (UTC)             End of Interval (UTC)
      -----------------------------       -----------------------------
      2005-SEP-10 02:57:26.358            2005-NOV-22 05:47:08.384


Help me create ssc files to implement this BSP files to work with Celestia.


FILES:
---------------
http://naif.jpl.nasa.gov/pub/naif/HAYAB ... us_v01.bsp
http://naif.jpl.nasa.gov/pub/naif/HAYAB ... 9_2010.bsp
http://naif.jpl.nasa.gov/pub/naif/HAYAB ... 43_140.bsp
http://naif.jpl.nasa.gov/pub/naif/HAYAB ... pkinfo.txt

[Limax7]

So what about Hayabusa kernels ?

Celestia don't read them?

My SSC file looks:

Code: Select all

"Itokawa:2025143" "Sol"
{
   Class "asteroid"
   BlendTexture "true"
   Mesh   "itokawa.cmod"
   Radius 0.2675  #dimensions : 0.535 x 0.294 x 0.209 km
   InfoURL " http://en.wikipedia.org/wiki/25143_Itokawa"

   Beginning "1989 1 1 00:00:00"
Timeline
[
   {
   Ending "2010 1 1 0:00:00"

   OrbitFrame { EclipticJ2000 { Center "Sol" }}

   SpiceOrbit {
   Kernel         "itokawa_1989_2010.bsp"
   Target         "2025143"
   Origin         "10"
   BoundingRadius  1e10
   Period  1.523
   }
   }

   {   
   EllipticalOrbit
   {
   Epoch             2455197.5  # Fri, 1 Jan 2010 00:00:00 UTC
   Period            1.52361796  # 556.4895735196305 days
   SemiMajorAxis     1.324054118646960E+00
   Eccentricity      2.801091920449724E-01
   Inclination       1.621921024606665E+00
   AscendingNode     6.908553140284295E+01
   ArgOfPericenter   1.627689654096713E+02
   MeanAnomaly       2.476992973430601E+02
   }
   }
]
   RotationPeriod 12.132
   Albedo 0.53
}

"Hayabusa" "Sol/Itokawa"
{
   Class "spacecraft"
   Mesh "satellite.3ds"
   Radius 0.005

   Beginning         "2005 9 10 2:57:26.358"
   Ending            "2005 11 22 5:47:08.384" # JD 2453696.741069259
   OrbitFrame { EclipticJ2000 { Center "Sol/Itokawa" }}
      SpiceOrbit {
      Kernel         "hayabusa_itokawarendezvous_v01.bsp"
      Target          "-130"
      Origin          "2025143"
      BoundingRadius  1e10
   }
   Albedo 0.5
}