You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
for CR3BP, NASA uses EMR as the term for Earth Moon Rotating Frame.
although I like EMB Earth Moon Barycenter or EMBR (EMB rotating)
For conversion of EMR units to m/sec and km and seconds
I'm using the following information:
27.32167 days per lunar sidereal revolution
1 EMB_days is 27.32167/2pi = 4.348378 days
1 EMB_secs = 375700. seconds (same as per radian of lunar revolution)
1 EMB distance =384400. km
1 EMB velocity = 1023.157 m/sec (Lunar rotational velocity)
1 EMB accel. = .002723335 m/sec2 EMBv/EMBsec=1023.157 / 375700.
Note: Don't forget that for EMB the location of X is the Barycenter.
So when converting EMB states to Kepler states for Lunar orbits:
The X coordinate needs to be subtracted by (1-mu) the X location of moon.
For X Earth orbits, subtract Mu from X because Earth is at [-mu, 0]
EMB_mu = .012153619
so for moon relative coordinates: X_km = ( X_EMB - (1 - .0121505845)) * 384400.
and for earth relative coordinates: X_km = ( X EMB + mu) * 384400.
The text was updated successfully, but these errors were encountered:
rslippert
changed the title
Convertion from cr3bp fixed frame units to m/sec and km and seconds
Conversion from cr3bp fixed frame units to m/sec and km and seconds
Mar 9, 2024
for CR3BP, NASA uses EMR as the term for Earth Moon Rotating Frame.
although I like EMB Earth Moon Barycenter or EMBR (EMB rotating)
For conversion of EMR units to m/sec and km and seconds
I'm using the following information:
27.32167 days per lunar sidereal revolution
1 EMB_days is 27.32167/2pi = 4.348378 days
1 EMB_secs = 375700. seconds (same as per radian of lunar revolution)
1 EMB distance =384400. km
1 EMB velocity = 1023.157 m/sec (Lunar rotational velocity)
1 EMB accel. = .002723335 m/sec2 EMBv/EMBsec=1023.157 / 375700.
Note: Don't forget that for EMB the location of X is the Barycenter.
So when converting EMB states to Kepler states for Lunar orbits:
The X coordinate needs to be subtracted by (1-mu) the X location of moon.
For X Earth orbits, subtract Mu from X because Earth is at [-mu, 0]
EMB_mu = .012153619
so for moon relative coordinates: X_km = ( X_EMB - (1 - .0121505845)) * 384400.
and for earth relative coordinates: X_km = ( X EMB + mu) * 384400.
The text was updated successfully, but these errors were encountered: