Space Launch Report:   ATHENA
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LM4.jpg (10741 bytes)Lockheed Martin Athena

Athena 2 (LM-004) used to launch Lunar Prospector

Athena is series of solid-motor based orbital launch vehicles offered by Lockheed Martin.  The vehicle was originally developed by Lockheed Corporation in 1993, when it was called the "Lockheed Launch Vehicle" (LLV).  Only the first unsuccessful launch in 1995 was conducted under the LLV name, as an LLV-1 variant. 

Lockheed merged with Martin Marietta shortly after that first flight.  For a time the rocket family was known as the "Lockheed Martin Launch Vehicle" (LMLV), but it was given the Athena name soon after it returned to flight in 1997.  Seven LLV/LMLV/Athena launch vehicles flew before the family was retired after 2001.  The retirement turned out to be temporary.  On March 25, 2010, Lockheed Martin announced plans to return a modified Athena to service using a new upper stage.      

Two Athena versions were originally flown.  Athena 1 used a Thiokol (later ATK) Castor 120 first stage and a United Technologies Chemical Systems Division Orbus 21D second stage.  Castor 120 was a commercial solid motor derived from the Peacekeeper first stage program.  The Orbus 21D stage was derived from an Inertial Upper Stage solid motor flown atop Shuttle, Titan 34D, and Titan 4.  Athena 2 used Castor 120 both as a first and second stage, with Orbus 21D as a third stage.  An original Lockheed designed Athena 3 was designed, but never flown.  It would have added two to six Castor 4A strap-on motors to an Athena 2 first stage, creating a rocket able to lift 1.8 to 3.6 tonnes to LEO.

LM4s1s.jpg (20175 bytes)Castor 120 First Stage Lift at SLC-46

Both Athena types could be equipped with an optional monopropellant Orbit Adjust Module (OAM) origionally developed by Primex Technologies (acquired by General Dynamics in 2001).  OAM used low-thrust pressure-fed monomethylhydrazine (MMH) thrusters to fine-tune or raise orbits, to provide roll control during solid motor burns, and to provide three-axis control during coast periods.

The first two launches took place from Vandenberg AFB Space Launch Complex 6, the mothballed, never-used Space Shuttle launch facility that itself had originally been constructed for the never-flown U.S. Air Force Titan 3M Manned Orbiting Laboratory program.  The first launch, on August 15, 1995, failed due to loss of flight control, causing a range safety destruct command to be issued 160 seconds into the flight.  Multiple failures plagued the flight.  A cable burned through near the end of the first stage burn, causing loss of first stage thrust vector control for a few moments.  Still, the rocket could have recovered from that problem during the second stage burn if the inertial navigation system had not failed.   Arcing due to the presence of ionized particles at high altitude created false readings, causing the rocket to steer in the wrong direction.  It turned out that the INS unit had originally been designed for use on helicopters and was not meant for use in the near-vacuum of space.

orbus21d.jpg (13957 bytes)Orbus 21D Upper Stage Lift

The second launch, of an LMLV-1 on August 22, 1997, successfully orbited NASA's Lewis satellite.  Unfortunately, Lewis failed only three days after reaching its initial near-polar orbit.  The dead spacecraft reentered a few days after launch since it was unable to maneuver to its intended, higher altitude sun synchronous operating orbit.

The Athena team moved to Cape Canaveral's new Space Launch Complex 46 for the rocket's next two launches.  On January 7, 1998 the first Athena-2 orbited NASA's Lunar Prospector.  The rocket, topped by an OAM fourth stage, boosted a 1,523 kg payload into low Earth orbit (LEO).  The payload mass mostly consisted of a Star 37FM solid motor that served as a trans-lunar injection (TLI) stage for the spin-stabilized spacecraft.  Five days after launch, Lunar Prospector used its on-board monopropellant system to maneuver itself into lunar orbit for a magnetic field mapping mission.

One year later, an Athena 1 launched ROCSAT 1, Taiwan's first satellite, into a 588 x 601 km x 35 deg orbit from SLC 46.  The rocket's OAM performed two burns to insert the 400 kg satellite into its orbit.   It would be the last launch from the Spaceport Florida pad for the original Athena program.

LM1OAMs.jpg (19574 bytes)OAM Stage Stacked on Final Athena 1

1999 also saw two Athena 2 launches from Vandenberg SLV 6.  Both carried Lockheed Martin-built 726 kg Ikonos commercial imaging satellites.  The first on April 27 failed to reach orbit due to a payload fairing separation failure.  The second, on September 24, succeeded.  Ikonos was lifted by Athena's OAM stage toward its final 678 km sun synchronous orbit.   Commentators noted that the latter launch was the first fully successful mission flown from SLC 6 after billions of dollars had been spent on the site over more than two decades.    

Two more years would pass before the next launch, of an Athena 1 that orbited several microsatellites from a new site on Kodiak Island, Alaska.  The rocket's OAM stage performed multiple burns to insert satellites into high and low orbits.  Having consumed its inventory of solid motors, Lockheed Martin quietly shelved Athena after the flight. 
 

LM1.jpg (8918 bytes)Athena 1 LM-001 Performs First Kodiak Orbital Launch

It seemed likely that Athena would not fly again, but on March 25, 2010 Lockheed Martin and ATK announced plans to restore Athena to service in the form of modified Athena 1c and Athena 2c rockets.  Both would use the same Castor 120 solid rocket motors, but would replace the retired Orbus 21D with ATK's new Castor 30 solid motor.  At the time, Athena 1c and 2c were expected to be available beginning in 2012.  Athena 2c was expected to be able to lift up to 1,712 kilograms into low Earth orbit (LEO). 

In March, 2012, Lockheed Martin announced that it had selected Alaska’s Kodiak Launch Complex (KLC) as its dedicated West Coast launch facility for its renewed Athena program.  Alaska Aerospace Corporation planned to update Kodiak facilities, including the possible construction of a brand new medium–lift launch pad to support a new Athena 3.  Lockheed Martin was evaluating "the business case" for Athena 3, which at the time was expected to be capable of launching satellites weighing 4,600 kg into polar orbits from Kodiak or 5,900 kg into lower inclination orbits from an East Coast pad.  

athenacharts.jpg (22621 bytes)Lockheed Martin Athena Family Chart, September 2013

In early September, 2013, Lockheed Martin revealed new plans for an Athena 2cS variant that would add two to six Orion 50SXLG strap on motors to the Castor 120 first stage.  Athena 2cS-6, the most powerful version, would more than double the capabilities of Athena 2c.  The design was similar to, but more capable than, the 1993 original never-flown "Athena 3"

Another SRB-based "Athena 3" design has been contemplated.  It was originally proposed in 2007 for the losing Planetspace Commercial Orbital Transporatation Service contract entry.  Lockheed Martin continued to study the design as of late 2013. 


Vehicle Configurations

  LEO
Payload
(metric tons)
(1) 200 km x 28.7 deg
(2) 200 km x 90 deg
(3) 500 km x 28.5 deg
(4) 700 km x 98 deg
GTO
(185 x 35,788km x 28.5 deg) with Star 37FM Stg 5
Earth Escape (C3=0)
with Star 37FM Stg 5
Configuration LIftoff
Height
(meters)
Liftoff
Mass
(metric tons)
(no payoad)
Athena 1 0.795 t (1)
0.515 t (2)
- - Castor 120 Stg 1 + Orbus 21D Stg 2
+ OAM Stg 3
~23 m ~64.8 t
Athena 2 1.985 t (1)
1.490 t (2)
0.593 t - Castor 120 Stg 1 + Castor 120 Stg 2 + Orbus 21D Stg 3 + OAM Stg 4 ~24.7 m ~117.9 t
Athena 1c 0.760 t (3)
0.470 t (4)
- - Castor 120 Stg 1 + Castor 30 Stg 2 + OAM Stg 3 20.0 m 69.17 t
Athena 2c 1.885 t (3)
1.295 t (4)
0.605 t 0.374 t Castor 120 Stg 1 + Castor 120 Stg 2 + Castor 30 Stg 3 + OAM Stg 4 29.5 m 123.65 t
Athena 2c "XL" 2.145 t (3)
1.550 t (4)
- - Castor 120XL Stg 1 + Castor 120 Stg 2 + Castor 30 Stg 3 + OAM Stg 4 - -
Athena 2cS-2 2.675 t (3)
1.895 t (4)
- - 2xOrion 50XSLG Boosters + Castor 120 Stg 1 +
Castor 120 Stg 2 + Castor 30 Stg 3 + OAM Stg 4
29.5 m ~156 t
Athena 2cS-4 3.520 t (3)
2.525 t (4)
- - 4xOrion 50XSLG Boosters + Castor 120 Stg 1 +
Castor 120 Stg 2 + Castor 30 Stg 3 + OAM Stg 4
29.5 m ~188 t
Athena 2cS-6 4.190 t (3)
3.030 t (4)
- - 6xOrion 50XSLG Boosters + Castor 120 Stg 1 +
Castor 120 Stg 2 + Castor 30 Stg 3 + OAM Stg 4
29.5 m ~221 t

Note:  No specifications available for Castor 120XL

Vehicle Components

Orion 50SXLG Castor 120 Orbus 21D Castor 30 Orbit Adjust
Module
Payload
Fairing
Diameter (m) 1.2703 m 2.36 m - 2.34 m 2.3 m 2.3 m (est)
Length (m) 9.4512 m 10.7 m - 3.5 m 1.0 m 9 m (est)
Empty Mass (tonnes) 1.1789 t 4.07 t 0.848 t 1.224 t 0.36 t 0.45 t (est)
Propellant Mass (tonnes) 15.0236 t 49.00 t 9.766 t 12.834 t 0.354 t -
Total Mass (tonnes) 16.2025 t 53.07 t 10.614 t 14.06 t 0.714 t -
Engine Orion 50SXLG Castor 120 Orbus 21D Castor 30 MR-107 -
Engine Mfgr ATK ATK UTC ATK Primex -
Fuel solid HTPB solid HTPB Solid HTPB solid HTPB Hydrazine -
Oxidizer solid HTPB solid HTPB Solid HTPB solid HTPB - -
Thrust
(SL tons)
- 163.27 t - - - -
Thrust
(Vac tons)
59.962 t (avg) 171.88 t (avg) 19.833 t 26.39 t (avg) 0.09 t -
ISP (SL sec) 229 s - - -
ISP (Vac sec) 273 s (avg) 278.9 s (avg) 293 s 294 s (avg, est) 222 s -
Burn Time (sec) 68.4 s 79.55 s 150 s 143 s 1,500 s -
No. Engines 1 1 1 1 4 -
Comments
TVC Nozzle TVC Nozzle TVC Nozzle TVC Nozzle Monopropellant,
Pressure Fed
-

References

http://www.flightglobal.com/articles/2008/01/21/220950/picture-atk-releases-first-image-of-planetspace-cots-bid-launch-vehicle.html
ATK Space Propulsion Products Catalog, May 2008
Lockheed Martin Press Release, March 2012
"Modular Athena Launch Vehicle Family", Lockheed Martin, September 2013
"Athena Mission Planners Guide", Lockheed Martin, January 2012

Last Update:  October 27, 2013