Exploration - When worlds colide

hypermumm

hypermumm
I doubt that the system map info is accurat enough to register the change. If they changed it, wich seems likely, they changed it by a tiny amount so that the moons will barely miss ech other.
 

Hank

H
I always wondered what a real planet - moon collision would look like. In the case of a moon orbit decay situation, it could be a slow but devastating process. Of course if a rogue planet came barreling through like a comet or asteroid it would be a noteworthy stellar event. Since my childhood I always admired sci-fi art that had a huge planet dominating the horizon and I wondered what it would be like to live there.
 
Last edited:

ruifo

R
I am curious because they are getting closer:
1634157952529.png
 

Orvidius

Orvidius
The latest scans that I have in my data (from August) show those two as having periods that differ by 0.35 hours. So, is that all FDev did, is change the semi-major axis so they miss each other? :D LOL
 

ruifo

R
MattG said:
Don’t think they’ll collide, but they should be under 250km apart surfrace to surface at their closest.
Click to expand...
I'll go there and check it out. Even if nothing happens, it will be a fun ride. Could someone try to estimate the closest encounter date, in the next few days?
 

ruifo

R
One's orbit line passing pretty close to the other's position:
k2.jpg
k1.jpg


The two orbital lines, as of today:
k3.jpg
 
Last edited:

Bravada Cadelanne

Bravada Cadelanne
ruifo said:
One's orbit line passing pretty close to the other's position:
View attachment 268958View attachment 268957

The two orbital lines, as of today:
View attachment 268964
Click to expand...

The conjunction interval is about 134.2944807 days, or 134 days, 7 hours, 4 minutes, 3 seconds.

It looks like Elite Dangerous mixed up the meaning of Mean Anomaly so that it is the sum of the actual Mean Anomaly and Argument of Periapsis - assuming the MeanAnomaly is the Mean Anomaly, and correcting the Longitude of Ascending Node for 2 c to account for the negative inclination, the moons would be about 75 degrees apart, which they definitely are not.

The Orrery puts the moons about 25 degrees apart, and taking the apparent meaning of the MeanAnomaly field above (once again correcting the Longitude of Ascending Node of 2 c for the negative inclination), the moons would have been about 23.2311 degrees apart at 2021-10-18T13:27:25Z.

Given this, the next conjunction should be at about 2021-10-27T05:26:40Z
 

ruifo

R
Bravada Cadelanne said:
The conjunction interval is about 134.2944807 days, or 134 days, 7 hours, 4 minutes, 3 seconds.

It looks like Elite Dangerous mixed up the meaning of Mean Anomaly so that it is the sum of the actual Mean Anomaly and Argument of Periapsis - assuming the MeanAnomaly is the Mean Anomaly, and correcting the Longitude of Ascending Node for 2 c to account for the negative inclination, the moons would be about 75 degrees apart, which they definitely are not.

The Orrery puts the moons about 25 degrees apart, and taking the apparent meaning of the MeanAnomaly field above (once again correcting the Longitude of Ascending Node of 2 c for the negative inclination), the moons would have been about 23.2311 degrees apart at 2021-10-18T13:27:25Z.

Given this, the next conjunction should be at about 2021-10-27T05:26:40Z
Click to expand...

Excellent, I'll try to be there and check it out. Many thanks.
 

Bravada Cadelanne

Bravada Cadelanne
Bravada Cadelanne said:
The conjunction interval is about 134.2944807 days, or 134 days, 7 hours, 4 minutes, 3 seconds.

It looks like Elite Dangerous mixed up the meaning of Mean Anomaly so that it is the sum of the actual Mean Anomaly and Argument of Periapsis - assuming the MeanAnomaly is the Mean Anomaly, and correcting the Longitude of Ascending Node for 2 c to account for the negative inclination, the moons would be about 75 degrees apart, which they definitely are not.

The Orrery puts the moons about 25 degrees apart, and taking the apparent meaning of the MeanAnomaly field above (once again correcting the Longitude of Ascending Node of 2 c for the negative inclination), the moons would have been about 23.2311 degrees apart at 2021-10-18T13:27:25Z.

Given this, the next conjunction should be at about 2021-10-27T05:26:40Z
Click to expand...
It seems that I fell for bad data.

Measuring the angles (by dropping out with the moon and planet lined up, and looking at the RelPos), gives an angle of about 30.4 degrees between the moons. It seems neither the Orrery nor the scan data can be trusted for moon orbits.

Given this, the next conjunction should actually be at about 8PM UTC on 31 Oct 2021 (plus or minus a few hours).
 

MattG

MattG
Bravada Cadelanne said:
It seems that I fell for bad data.

Measuring the angles (by dropping out with the moon and planet lined up, and looking at the RelPos), gives an angle of about 30.4 degrees between the moons. It seems neither the Orrery nor the scan data can be trusted for moon orbits.

Given this, the next conjunction should actually be at about 8PM UTC on 31 Oct 2021 (plus or minus a few hours).
Click to expand...

Do you (or anyone) happen to have journals for 2b/2c since this system was fixed? Because the old conjunction interval was 134.294 days as you said previously - but if the data on EDSM is correct, the conjunction interval now would be 135.9380731 days. So, did the orbital periods also get tweaked when they fixed this one, or is this down to something else - perhaps my miscalculation, or poor precision data type storing the orbital period?

FWIW, before they fixed this system, I had 31-Oct-2021 20:36 (+/- some hours) as a predicted time based on a reading in July 2018.
 

Bravada Cadelanne

Bravada Cadelanne
Scans from in Odyssey:
2 b:
JSON: 
{
    "timestamp": "2021-10-18T13:29:20Z",
    "event": "Scan",
    "ScanType": "Detailed",
    "BodyName": "Kyloasly DA-A f69 2 b",
    "BodyID": 13,
    "Parents": [
        {
            "Planet": 9
        },
        {
            "Null": 1
        },
        {
            "Star": 0
        }
    ],
    "StarSystem": "Kyloasly DA-A f69",
    "SystemAddress": 37173576805,
    "DistanceFromArrivalLS": 3207.500573,
    "TidalLock": true,
    "TerraformState": "",
    "PlanetClass": "Icy body",
    "Atmosphere": "",
    "AtmosphereType": "None",
    "Volcanism": "major water geysers volcanism",
    "MassEM": 0.003590,
    "Radius": 1346912.875000,
    "SurfaceGravity": 0.788723,
    "SurfaceTemperature": 21.185604,
    "SurfacePressure": 0.000000,
    "Landable": true,
    "Materials": [
        {
            "Name": "sulphur",
            "Percent": 26.291981
        },
        {
            "Name": "carbon",
            "Percent": 22.108835
        },
        {
            "Name": "phosphorus",
            "Percent": 14.154456
        },
        {
            "Name": "iron",
            "Percent": 11.833029
        },
        {
            "Name": "nickel",
            "Percent": 8.950006
        },
        {
            "Name": "chromium",
            "Percent": 5.321705
        },
        {
            "Name": "manganese",
            "Percent": 4.886919
        },
        {
            "Name": "selenium",
            "Percent": 4.114918
        },
        {
            "Name": "tellurium",
            "Percent": 0.879669
        },
        {
            "Name": "niobium",
            "Percent": 0.808724
        },
        {
            "Name": "tungsten",
            "Percent": 0.649752
        }
    ],
    "Composition": {
        "Ice": 0.825448,
        "Rock": 0.158834,
        "Metal": 0.015718
    },
    "SemiMajorAxis": 216169065.237045,
    "Eccentricity": 0.000959,
    "OrbitalInclination": 0.146677,
    "Periapsis": 269.940114,
    "OrbitalPeriod": 120757.567883,
    "AscendingNode": -178.757785,
    "MeanAnomaly": 135.891390,
    "RotationPeriod": 120772.765114,
    "AxialTilt": -0.413393,
    "WasDiscovered": true,
    "WasMapped": true
}
2 c:
JSON: 
{
    "timestamp": "2021-10-18T13:27:25Z",
    "event": "Scan",
    "ScanType": "Detailed",
    "BodyName": "Kyloasly DA-A f69 2 c",
    "BodyID": 14,
    "Parents": [
        {
            "Planet": 9
        },
        {
            "Null": 1
        },
        {
            "Star": 0
        }
    ],
    "StarSystem": "Kyloasly DA-A f69",
    "SystemAddress": 37173576805,
    "DistanceFromArrivalLS": 3207.185830,
    "TidalLock": true,
    "TerraformState": "",
    "PlanetClass": "Icy body",
    "Atmosphere": "",
    "AtmosphereType": "None",
    "Volcanism": "major water geysers volcanism",
    "MassEM": 0.001989,
    "Radius": 1108170.750000,
    "SurfaceGravity": 0.645551,
    "SurfaceTemperature": 21.179810,
    "SurfacePressure": 0.000000,
    "Landable": true,
    "Materials": [
        {
            "Name": "sulphur",
            "Percent": 26.353050
        },
        {
            "Name": "carbon",
            "Percent": 22.160187
        },
        {
            "Name": "phosphorus",
            "Percent": 14.187331
        },
        {
            "Name": "iron",
            "Percent": 11.860512
        },
        {
            "Name": "nickel",
            "Percent": 8.970794
        },
        {
            "Name": "chromium",
            "Percent": 5.334066
        },
        {
            "Name": "manganese",
            "Percent": 4.898270
        },
        {
            "Name": "selenium",
            "Percent": 4.124475
        },
        {
            "Name": "tellurium",
            "Percent": 0.881712
        },
        {
            "Name": "tin",
            "Percent": 0.711670
        },
        {
            "Name": "mercury",
            "Percent": 0.517929
        }
    ],
    "Composition": {
        "Ice": 0.825448,
        "Rock": 0.158834,
        "Metal": 0.015718
    },
    "SemiMajorAxis": 218861830.234528,
    "Eccentricity": 0.001111,
    "OrbitalInclination": -0.073339,
    "Periapsis": 321.730187,
    "OrbitalPeriod": 122027.558088,
    "AscendingNode": -116.328708,
    "MeanAnomaly": 276.350645,
    "RotationPeriod": 122042.850432,
    "AxialTilt": 0.086048,
    "WasDiscovered": true,
    "WasMapped": true
}

It looks like they increased the semimajor axis of 2 c by 630km, and increased the orbital period by 0.04 seconds (where Kepler's third law would have the period increasing by 523 seconds).
They also reduced the semimajor axis of 2 b by 550km, and increased the orbital period by 0.015 seconds (where Kepler's third law would have the period reducing by 461 seconds).
 

Bravada Cadelanne

Bravada Cadelanne
Bravada Cadelanne said:
It seems that I fell for bad data.

Measuring the angles (by dropping out with the moon and planet lined up, and looking at the RelPos), gives an angle of about 30.4 degrees between the moons. It seems neither the Orrery nor the scan data can be trusted for moon orbits.

Given this, the next conjunction should actually be at about 8PM UTC on 31 Oct 2021 (plus or minus a few hours).
Click to expand...
Gah - 178.1 (the measured longitude of 2 b at 11:52:51 UTC) - 157 (the measured longitude of 2 c at 11:57:04 UTC) - 0.7 (the angle 2 c would have travelled in 4m 13s) is 20.4, not 30.4

Code: 
{11:52:51GMT 485.333s} System:"Kyloasly DA-A f69" StarPos:(-10497.625,-1122.344,20810.031)ly Body:9 RelPos:(-3.04698e+06,45897.5,-101151)km NormalFlight
{11:57:04GMT 738.267s} System:"Kyloasly DA-A f69" StarPos:(-10497.625,-1122.344,20810.031)ly Body:9 RelPos:(-2.01086e+06,427725,-853536)km NormalFlight

That would make it about 02:30 UTC on 28 Oct 2021.
 

Bravada Cadelanne

Bravada Cadelanne
Bravada Cadelanne said:
The conjunction interval is about 134.2944807 days, or 134 days, 7 hours, 4 minutes, 3 seconds.

It looks like Elite Dangerous mixed up the meaning of Mean Anomaly so that it is the sum of the actual Mean Anomaly and Argument of Periapsis - assuming the MeanAnomaly is the Mean Anomaly, and correcting the Longitude of Ascending Node for 2 c to account for the negative inclination, the moons would be about 75 degrees apart, which they definitely are not.

The Orrery puts the moons about 25 degrees apart, and taking the apparent meaning of the MeanAnomaly field above (once again correcting the Longitude of Ascending Node of 2 c for the negative inclination), the moons would have been about 23.2311 degrees apart at 2021-10-18T13:27:25Z.

Given this, the next conjunction should be at about 2021-10-27T05:26:40Z
Click to expand...
I was assuming that AscendingNode and Periapsis were in the same direction as MeanAnomaly, but they're actually in the opposite direction. That would have put the moons 25.9 degrees apart at 2021-10-18T13:27:25Z, which would put the conjunction at about 2021-10-28T05:20:46Z (plus or minus a few hours)

24 Oct 2021, 13:00Z
Screenshot_0001.jpg
Screenshot_0003.jpg

Screenshot_0004.jpg
 
You must log in or register to reply here.
Back
Top Bottom