---

Transposition, docking, and extraction

From MedBib.com - Medicine & Nature

Transposition, docking, and extraction (abbreviated to TD&E, often just transposition and docking) is a space rendezvous maneuver performed during the Apollo lunar missions of the 1960s and 70s. It was performed after the trans lunar injection burn that placed the Apollo spacecraft on the trajectory towards the moon, but before reaching the Moon or attaining lunar orbit.

Contents 1 Performing TD&E 2 Missions 3 References 4 See also 5 External links

Performing TD&E

It was performed by the Command Module pilot (although as a contingency, the Lunar Module pilot and commander were also trained to perform the maneuver), and involved separating the CSM from the Lunar Module, pitching the CSM 180° to reattach the two spacecraft, by inserting a probe on the CSM into the Lunar Module. Then, the Apollo spacecraft stack would separate from the LM container of on the S-IVB, which would then either continue on to a heliocentric orbit or be deliberately steered into a crash landing on the Moon.

Missions

TD&E was performed on all Apollo missions from Apollo 9 onward, as these flights carried the LM. The maneuver was first practiced on the earth-orbiting Apollo 7 flight, but the S-IVB utlized a LM fairing adapter that did not separate from the S-IVB, thus the crew could not approach the S-IVB in fear that the adapter "petals" would strike the Apollo CSM. This was corrected with all flights commencing with Apollo 8 when the fairing "petals" would fall away from the S-IVB.^[1]

The last mission to use the TD&E maneuver was the Apollo-Soyuz Test Project mission in which the Apollo CSM used the procedure to extract the docking adapter used to link up the Apollo and Soyuz 19 spacecraft in the first, and only joint mission between the U.S. and the Soviet Union (although there would be much future cooperation in space between the post-Soviet Roskosmos and NASA).

References

See also

• Manned Venus Flyby - a TD&E maneuver would also have been required on this mission

External links

• Apollo 15 Flight Journal: Transposition, Docking and Extraction

v • d • e Orbits   Types General Box · Capture · Circular · Elliptical / Highly elliptical · Escape · Graveyard · Hyperbolic trajectory · Inclined / Non-inclined · Osculating · Parabolic trajectory · Parking · Synchronous (semi · sub) Geocentric Geosynchronous · Geostationary · Sun-synchronous · Low Earth · Medium Earth · Molniya · Near-equatorial · Orbit of the Moon · Polar · Tundra · Two-line elements About other points Areosynchronous · Areostationary · Halo · Lissajous · Lunar · Heliocentric · Heliosynchronous   Parameters Classical  Inclination ·  Longitude of the ascending node ·  Eccentricity ·  Argument of periapsis ·  Semi-major axis ·  Mean anomaly at epoch Other  True anomaly ·  Semi-minor axis ·  Linear eccentricity ·  Eccentric anomaly ·  Mean longitude ·  True longitude ·  Orbital period   Maneuvers Bi-elliptic transfer · Delta-v budget · Geostationary transfer · Gravity assist · Gravity turn · Hohmann transfer · Low energy transfer · Oberth effect  · Inclination change · Phasing · Rendezvous · Transposition, docking, and extraction   Other orbital mechanics topics Apsis · Celestial coordinate system · Direct motion · Epoch · Ephemeris · Equatorial coordinate system · Ground track · Interplanetary Transport Network · Kepler's laws of planetary motion · Lagrangian point · n-body problem · Orbit equation · Orbital speed · Orbital state vectors · Perturbation · Retrograde motion · Specific orbital energy · Specific relative angular momentum List of orbits

This spacecraft or satellite related article is a stub. You can help Wikipedia by expanding it. v • d • e

---

This article is licensed under the GNU Free Documentation License.
All material adapted used from Wikipedia is available under the terms of the GNU Free Documentation License.
Seeking health information online: does Wikipedia matter?

---

---