Page 18 of 99
Posted: 01.07.2018, 13:02
by toutatis
and now I present the project GRAIL for Celestia...
Added after 5 minutes 12 seconds:The Gravity Recovery and Interior Laboratory (GRAIL) was an American lunar science mission in NASA's Discovery Program which used high-quality gravitational field mapping of the Moon to determine its interior structure. The two small spacecraft GRAIL A (Ebb) and GRAIL B (Flow) were launched on 10 September 2011 aboard a single launch vehicle: the most-powerful configuration of a Delta II, the 7920H-10. GRAIL A separated from the rocket about nine minutes after launch, GRAIL B followed about eight minutes later. They arrived at their orbits around the Moon 25 hours apart. The first probe entered orbit on 31 December 2011 and the second followed on 1 January 2012. The two spacecraft impacted the Lunar surface on December 17, 2012...
https://en.wikipedia.org/wiki/GRAIL
Posted: 01.07.2018, 13:33
by toutatis
Can I ask you, dear members of this forum... Why the Moon without shadow?
![Не понимаю :insane:](./images/smilies/smile_insane.gif)
Posted: 01.07.2018, 13:43
by Croc
Posted: 01.07.2018, 15:22
by gironde
The model is very well.
But the orbit (red)… is not around the Moon.
![Sad :sad:](./images/smilies/smile_sad.gif)
Posted: 01.07.2018, 15:47
by toutatis
But the orbit (red)… is not around the Moon
Because it is Sampled Trajectory... lol
Gironde... do you see that for the first time...???
![Огромная улыбка :biggrin:](./images/smilies/smile_biggrin.gif)
Posted: 01.07.2018, 15:52
by toutatis
I will change step in XYZV-files for GRAIL... currently step is 20 mins... but I will change to 5 mins... otherwise these spacecrafts will crash before real endind date... lol too low orbita....
Posted: 01.07.2018, 15:57
by toutatis
Adjust the illumination [Ambient Light Level]...
![Улыбается :smile:](./images/smilies/smile_real.gif)
Croc... I am not about it... See... when Spacecraft at the night side of the Moon... it still continue to reflect the sun light... that is very interesting...
Posted: 01.07.2018, 17:06
by gironde
Code: Select all
for Grail, I prefer this orbit obtained by:
"GRAIL-A(Ebb)" "Sol/Earth/Moon"
{
Class "spacecraft"
Mesh "grail-a.cmod"
Radius 0.0015
Beginning "2012 08 30" # launch, wake up from the satellite 30-08-2012
Ending "2012 12 16" # Impact date December 17, 2012, 22:28:51 UTC
EllipticalOrbit #
{
Epoch 2456230.50 # 30-10-2012 04-02-2012 ?
Period 0.07673501089679145
SemiMajorAxis 1760.758052604271
Eccentricity 0.004771242459779582
Inclination 89.59983804382647
AscendingNode 115.2294647611078
ArgOfPericenter 152.9789886943472
MeanAnomaly 94.50137164555893
}
}
"GRAIL-B(Flow)" "Sol/Earth/Moon"
{
Class "spacecraft"
Mesh "grail-b.cmod"
Radius 0.0015
Beginning "2012 08 30" # launch, wake up from the satellite 30-08-2012
Ending "2012 12 16" # Impact date December 17, 2012, 22:29:21 UTC
EllipticalOrbit #
{
Epoch 2456230.50 # 30-10-2012
Period 0.07673681928438110
SemiMajorAxis 1760.785715948266
Eccentricity 0.004807627121886406
Inclination 89.60042710505637
AscendingNode 115.2190714991370
ArgOfPericenter 153.3239299934955
MeanAnomaly 91.92928566236402
}
}
It is truly the orbit of the satellite around the Moon which is displayed and not the curve drawn in relation to its absolute spatial position unrelated to the Moon.
![Hi! :hi:](./images/smilies/smile_hand.gif)
Posted: 01.07.2018, 17:25
by toutatis
It is truly the orbit of the satellite around the Moon which is displayed and not the curve drawn in relation to its absolute spatial position unrelated to the Moon.
that is funny... the orbit of GRAIL was changed several times during mission....
Posted: 01.07.2018, 17:29
by toutatis
Watch Gironde... but your orbit can show only VERY SMALL part of GRAIL mission...
Posted: 01.07.2018, 17:34
by gironde
Grail-A timeline :
10-09-2011 : launch
12-2011 : Lagrange L1 Earth-Moon
31-12-2011 : approach Moon
31-12-2011 to 02-2012 : modified orbit
08-03-2012 : beginning of mission for 82 days
alt 15km, alt 50km
29-05-2012 : ending of principal mission
30-08-2012 : new mission (alt 23km)
17-12-2012 : ending, crash to the Moon
periods with the same orbit are short-lived.
Yes my orbit in ssc is a very small part but it seems to me more just.
It is necessary to regulate the Orbit Center with the files .xyzv otherwise it turns around the Sun.
To have longer periods, you have to program a TimeLine with several different periods and orbits.
![Hi! :hi:](./images/smilies/smile_hand.gif)
Posted: 01.07.2018, 17:45
by toutatis
Gironde... You need to watch Cassini spacecraft trajectory in Celestia... or MESSENGER... learn it better...
Posted: 01.07.2018, 18:43
by gironde
Cassini has an OrbitFrame centered on the Sun with use of .xyz, okay.
But the first line of the script says it's in orbit around Saturn
"Cassini" "Sol / Saturn".
There are 3 phases in the Timeline at different dates for 3 different orbits.
Messenger also uses .xyz but is in orbit around Mercury
"Messenger" "Sol / Mercury"
You put everything around "Sol"
so your satellites orbit around "Sol"
Added after 17 minutes 25 seconds:Messenger uses only one .xyz file between 2004 and 2015 and even there, the orbit is drawn around the Sun and never around Mercury. This is where we see the limit of .xyz files
The curve drawn around the Sun is indeed all spatial positions but is not the orbit around the Orbit Center.
Posted: 01.07.2018, 20:56
by toutatis
Okay Gironde... You can stay with your orbit... but I will stay with my opinion...
![Подмигивает :wink:](./images/smilies/smile_wink.gif)
Posted: 02.07.2018, 06:48
by gironde
No problem, Toutatis, and bravo for your excellent modeling work !
![Hi! :hi:](./images/smilies/smile_hand.gif)
Posted: 02.07.2018, 08:52
by toutatis
Just prepared SSC-file for GRAIL... there I used timeline which include Sampled Orbits in the start and the end of mission... and also Ecliptical Orbits... now I testing it... Central body for all of these orbits is Moon...
Added after 56 seconds:No problem, Toutatis, and bravo for your excellent modeling work !
Thanks Gironde...
![Улыбается :smile:](./images/smilies/smile_real.gif)
Posted: 02.07.2018, 11:10
by gironde
Designation : DSP-22
Number in the catalog of space objects: 28158
COSPAR ID: 2004-004-A
Name in the catalog of space objects: USA 176
Satellite details
Orbit: 35,741 x 35,753 km, 8.1 °
category: military observatory
Nationality / organization of origin: United States
Intrinsic brightness (Magnitude): ?
launching Date (UTC): Saturday, February 14, 2004 18:50
Launch site: Cape Canaveral Air Force Station, United States
Launcher: Titan 402B / IUS
it is a satellite of detection and military observation but it has also been used for civil observations.
I can not put some textures on some faces, so I'll be able to do it with the available textures and the .dae and .3ds files that have been used to release a cmod.
The file size is due to the textures. Some will be useless in the end.
![Hi! :hi:](./images/smilies/smile_hand.gif)
Posted: 02.07.2018, 11:28
by toutatis
GRAIL with modified orbit... added still 2 xyzv-files...
Code: Select all
"GRAIL-A(Ebb)" "Sol/Earth/Moon"
{
Class "spacecraft"
Mesh "grail-a.cmod"
Radius 0.0015
Timeline
[
{
Beginning "2011 09 10 13:10"
Ending 2455928.5 # 2012 Jan 02 00:00
SampledTrajectory
{
Source "grail-a.xyzv"
DoublePrecision true
Interpolation "cubic"
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-A(Ebb)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2455987.5 # 2012 Mar 01 00:00
OrbitFrame
{
EclipticJ2000 {Center "Sol/Earth/Moon"}
}
EllipticalOrbit
{
Epoch 2455928.5 # 2012 Jan 02 00:00
Period 0.4764834279979402
SemiMajorAxis 5948.432131563661
Eccentricity 0.6924146547374508
Inclination 88.27157197861658
AscendingNode 118.978766816641
ArgOfPericenter 356.9882234966317
MeanAnomaly 109.2409392047193
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-A(Ebb)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2456076.5 # 2012 May 29 00:00
OrbitFrame
{
EclipticJ2000 {Center "Sol/Earth/Moon"}
}
EllipticalOrbit
{
Epoch 2455987.5 # 2012 Mar 01 00:00
Period 0.07883396109724304
SemiMajorAxis 1792.721703634708
Eccentricity 0.01710133334446178
Inclination 90.06810582250156
AscendingNode 118.4533517003967
ArgOfPericenter 177.2661887477396
MeanAnomaly 50.21593309775926
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-A(Ebb)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2456169.5 # 2012 Aug 30 00:00
OrbitFrame
{
EclipticJ2000 {Center "Sol/Earth/Moon"}
}
EllipticalOrbit
{
Epoch 2456076.5 # 2012 May 29 00:00
Period 0.078820329650388
SemiMajorAxis 1792.515040629732
Eccentricity 0.01871946854820806
Inclination 90.31650960495885
AscendingNode 117.330938345788
ArgOfPericenter 343.615030837698
MeanAnomaly 142.6507686350161
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-A(Ebb)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2456276.5 # 2012 Dec 15 00:00
OrbitFrame
{
EclipticJ2000 {Center "Sol/Earth/Moon"}
}
EllipticalOrbit
{
Epoch 2456169.5 # 2012 Aug 30 00:00
Period 0.07678416670471568
SemiMajorAxis 1761.509923626031
Eccentricity 0.001284622322057169
Inclination 90.76557145585075
AscendingNode 116.4163077005435
ArgOfPericenter 132.8817359984076
MeanAnomaly 252.7076545510066
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-A(Ebb)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2456279.437431 # 2012 Dec 17 22:29:54.0000 TDB
SampledTrajectory
{
Source "grail-a-final.xyzv"
DoublePrecision true
Interpolation "cubic"
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-A(Ebb)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-A(Ebb)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
]
}
"GRAIL-B(Flow)" "Sol/Earth/Moon"
{
Class "spacecraft"
Mesh "grail-b.cmod"
Radius 0.0015
Timeline
[
{
Beginning "2011 09 10 13:10"
Ending 2455928.5 # 2012 Jan 02 00:00
SampledTrajectory
{
Source "grail-b.xyzv"
DoublePrecision true
Interpolation "cubic"
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-B(Flow)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2455987.5 # 2012 Mar 01 00:00
OrbitFrame
{
EclipticJ2000 {Center "Sol/Earth/Moon"}
}
EllipticalOrbit
{
Epoch 2455928.5 # 2012 Jan 02 00:00
Period 0.4776203291674804
SemiMajorAxis 5957.890442931774
Eccentricity 0.6892279568464152
Inclination 89.44122051016714
AscendingNode 118.8202029291941
ArgOfPericenter 355.6639584569451
MeanAnomaly 50.01164219731344
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-B(Flow)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2456076.5 # 2012 May 29 00:00
OrbitFrame
{
EclipticJ2000 {Center "Sol/Earth/Moon"}
}
EllipticalOrbit
{
Epoch 2455987.5 # 2012 Mar 01 00:00
Period 0.07882694403541249
SemiMajorAxis 1792.615321178112
Eccentricity 0.0170408602073046
Inclination 90.06475023433207
AscendingNode 118.4469278176967
ArgOfPericenter 177.2667388208952
MeanAnomaly 52.77210628335125
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-B(Flow)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2456169.5 # 2012 Aug 30 00:00
OrbitFrame
{
EclipticJ2000 {Center "Sol/Earth/Moon"}
}
EllipticalOrbit
{
Epoch 2456076.5 # 2012 May 29 00:00
Period 0.07882308655490666
SemiMajorAxis 1792.556838340461
Eccentricity 0.01872549084043667
Inclination 90.31192170687589
AscendingNode 117.3188144256476
ArgOfPericenter 343.600352008243
MeanAnomaly 145.4291974597704
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-B(Flow)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2456276.5 # 2012 Dec 15 00:00
OrbitFrame
{
EclipticJ2000 {Center "Sol/Earth/Moon"}
}
EllipticalOrbit
{
Epoch 2456169.5 # 2012 Aug 30 00:00
Period 0.07678298347220741
SemiMajorAxis 1761.521427216069
Eccentricity 0.001436897456442038
Inclination 90.77673513209157
AscendingNode 116.3983333835724
ArgOfPericenter 140.6915682827892
MeanAnomaly 242.6018881352763
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-B(Flow)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
{
Ending 2456279.437431 # 2012 Dec 17 22:29:54.0000 TDB
SampledTrajectory
{
Source "grail-b-final.xyzv"
DoublePrecision true
Interpolation "cubic"
}
BodyFrame
{
TwoVector
{
Center "Sol/Earth/Moon/GRAIL-B(Flow)"
Primary
{
Axis "-z"
RelativePosition
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol"
}
}
Secondary
{
Axis "y"
RelativeVelocity
{
Observer "Sol/Earth/Moon/GRAIL-B(Flow)"
Target "Sol/Earth"
}
}
}
}
FixedRotation
{
Period 0.0
}
}
]
}
Posted: 02.07.2018, 11:33
by gironde
Now a little japanese launcher: Epsilon 1
height 24.4m
payload 1T5
small size for small satellites and small launch site.
3 launches, all successful, but others are already planned.
I put it in launch situation, on the ground, without being able to align it correctly.
It's up to you to try.
Posted: 02.07.2018, 12:02
by gironde
attached list of addons published on topic "Spacecrafts for Celestia"
this list is in Excel format.
The different posts for each addon are listed in different columns with the direct link in comentaire.
This allows you to find more easily a subject and its modifications.