To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
Show all languages
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

From Wikipedia, the free encyclopedia

TDRS-L Undergoes Checkouts.jpg
TDRS-L at the Astrotech payload processing facility
Mission typeCommunications
COSPAR ID2014-004A
SATCAT no.39504
Mission durationPlanned: 15 years
Elapsed: 7 years, 4 months, 19 days
Spacecraft properties
Launch mass3,454 kg (7,615 lb)[1]
Start of mission
Launch date24 January 2014, 02:33 (2014-01-24UTC02:33) UTC[2]
RocketAtlas V 401
Launch siteCape Canaveral SLC-41
ContractorUnited Launch Alliance
Orbital parameters
Reference systemGeocentric
RegimeGeosynchronous orbit
Perigee altitude35,785 kilometers (22,236 mi)[3]
Apogee altitude35,797 kilometers (22,243 mi)[3]
Inclination6.77 degrees[3]
Period1436.03 minutes[3]
Epoch22 January 2015, 07:10:47 UTC[3]
TDRS L Project fairing logo.png

TDRS-12, known before launch as TDRS-L, is an American communications satellite operated by NASA as part of the Tracking and Data Relay Satellite System. The twelfth Tracking and Data Relay Satellite, it is the second third-generation spacecraft to be launched, following TDRS-11 in 2013.[4]


TDRS-12 was constructed by Boeing, based on the BSS-601HP satellite bus. Fully fueled, it has a mass of 3,454 kg (7,615 lb), with a design life of 15 years.[1] It carries two steerable antennas capable of providing S, Ku and Ka band communications for other spacecraft, with an additional array of S-band transponders for lower-rate communications with five further satellites.[4] The satellite is powered by two solar arrays, which produce 2.8 to 3.2 kilowatts of power, while an R-4D-11-300 engine is present to provide propulsion.[1][5]


The United Launch Alliance was contracted to launch TDRS-12. The spacecraft was launched on 24 January 2014 at 02:33 UTC (21:33 local time on 23 January).[2] An Atlas V rocket was used, flying in the 401 configuration, with tail number AV-043.[5] After launch, TDRS-12 was deployed into a high-perigee geosynchronous transfer orbit.[6] The spacecraft raised itself into a geosynchronous orbit using its onboard propulsion system.



  1. ^ a b c Krebs, Gunter. "TDRS K, L, M". Gunter's Space Page. Retrieved 23 January 2013.
  2. ^ a b "TRDS-L Lifts Off". NASA. Retrieved 24 January 2014.
  3. ^ a b c d e "TDRS-12 Satellite details 2014-004A NORAD 39504". N2YO. 22 January 2015. Retrieved 25 January 2015.
  4. ^ a b "TDRS-K Media Kit" (PDF). NASA. Retrieved 23 January 2014.
  5. ^ a b Graham, William (23 January 2014). "ULA set to open 2014 campaign with Atlas V launch of TDRS-L". Retrieved 23 January 2014.
  6. ^ "TDRS-L Atlas V Mission Overview" (PDF). United Launch Alliance. Archived from the original (PDF) on 1 February 2014. Retrieved 23 January 2014.

This page was last edited on 27 July 2020, at 11:20
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.