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{{Era|UNSC|HCW}}
{{Status|Canon}}
{{Weapon Infobox
{{Weapon infobox
|image=[[File:HReach-OnagerMDC.png|300px]]
|image=[[File:HReach-OnagerMDC.png|300px]]
|name=Onager
|name=Mark 2488 Magnetic Accelerator Cannon
|manufacturer=
|manufacturer=[[Misriah Armory]]
|model=Mk/2488
|model=Mk/2488
|type=Magnetic Accelerator Cannon
|type=Magnetic Accelerator Cannon
|cost=
|cost=
|size=32.6 m (106.9 ft)
|length={{Convert|106.9|ft|m|sp=us|disp=flip}}{{Ref/Book|Id=Enc22|Enc22|Page=182}}
|damage per hit=1.1 gigajoules
|width={{Convert|46.2|ft|m|sp=us|disp=flip}}{{Ref/Reuse|Enc22}}
|height={{Convert|33|ft|m|sp=us|disp=flip}}{{Ref/Reuse|Enc22}}
|weight=93.4 tonnes (103 tons){{Ref/Reuse|Enc22}}
|damage per hit=
|magazine=
|magazine=
|maxammo=
|maxammo=
|fire=
|fire=
|ammotype=15 cm ferric-tungsten slug<ref name="vis">'''[[Halo: The Essential Visual Guide]]''', ''page 114''</ref>
|ammotype=15 cm M895 HV/FTHPP (1.1 gigajoules per hit){{Ref/Reuse|Enc22}}<ref name="vis">'''[[Halo: The Essential Visual Guide]]''', ''page 114''</ref>
|operation=[[Wikipedia:Coilgun|Electromagnetic linear motor]]
|operation=[[Wikipedia:Coilgun|Electromagnetic linear motor]]
|rate of fire=20 rounds a minute
|rate=20 rounds a minute
|velocity=High
|velocity=High
|accuracy=High
|optics=
|range=
|range=Long
|era=[[Human-Covenant War]]
|service=[[Human-Covenant War]]
|counterpart=
|counterwep=
|affiliation=United Nations Space Command
|affiliation=United Nations Space Command
|mpguide=
}}
}}
The '''Mark 2488 Magnetic Accelerator Cannon''', formally designated '''15cm Mark/2488 1.1GJ MAC''', also known as the '''Onager''' and often referred to as a "'''[[mass driver]]'''", is a stationary [[Magnetic Accelerator Cannon]] used by the [[United Nations Space Command]] during the [[Human-Covenant War]].<ref name="stats">'''[[Bungie.net]]''' ''Halo: Reach'' game stats</ref>
The '''Mark 2488 Magnetic Accelerator Cannon''', formally designated '''15&nbsp;cm Mark/2488 1.1GJ MAC''', also known as the '''Onager''' and often referred to as a "'''[[mass driver]]'''", is a stationary [[Magnetic Accelerator Cannon]] used by the [[United Nations Space Command]] during the [[Human-Covenant War]].<ref name="stats">'''[[Bungie.net]]''' ''Halo: Reach'' game stats</ref>
 
The [[Mark 2551 Magnetic Accelerator Cannon|Mark 2551/25cm Portable]] is an upgraded variant of the weapon brought into service after the war.


==Design details==
==Design details==
The Onager is capable of firing a 15 cm round with up to 1.1 gigajoules of kinetic energy.<ref name="stats"/> It has five linearly arranged magnetic coils, each of which needs to charge individually before each shot. The weapon needs to cool off after every shot, and does so by opening a radial vent on the upper portion of the barrel. The weapon is operated from a small booth on the left side of the cannon.<ref name="reach"/>
The Onager is capable of firing a 15&nbsp;cm ferric-tungsten hollow-point round with up to 1.1 gigajoules of kinetic energy.{{Ref/Reuse|stats}} It has five linearly arranged magnetic coils, each of which needs to charge individually before each shot. The weapon needs to cool off after every shot, and does so by opening a radial vent on the upper portion of the barrel. The weapon is operated from a small booth on the left side of the cannon.{{Ref/Reuse|reach}}


==Operational history==
==Operational history==
During the [[Fall of Reach]], a group of [[UNSC Marine Corps|UNSC Marines]] installed an Onager on top of one of the planet's [[Aszod ship breaking yards|ship-breaking facilities]] in [[Aszod]] to protect the drydocked {{UNSCShip|Pillar of Autumn}}. [[Emile-A239]] manned the mass driver to fend off incoming Covenant [[Type-26 Ground Support Aircraft|Banshees]] and [[Type-52 Troop Carrier|Phantoms]] before the ''Autumn'' could take off.<ref name="reach">'''Halo: Reach''', campaign level ''[[The Pillar of Autumn (Halo: Reach level)|The Pillar of Autumn]]''</ref> However, the SPARTAN was killed by a [[Sangheili Zealot]], prompting [[SPARTAN-B312]] to commandeer the cannon and successfully delay the Covenant assault on the ''Autumn'' by crippling an incoming [[CCS-class battlecruiser]] with a shot to its ventral [[energy projector]].<ref name="reach"/>
During the [[Fall of Reach]], a group of [[UNSC Marine Corps|UNSC Marines]] installed an Onager on top of one of the planet's [[Asźod ship breaking yards|ship-breaking facilities]] in [[Asźod]] to protect the drydocked {{UNSCShip|Pillar of Autumn}}. [[Emile-A239]] manned the mass driver to fend off incoming Covenant [[Type-26 Ground Support Aircraft|Banshees]] and [[Kez'katu-pattern Phantom|Phantoms]] before the ''Autumn'' could take off.<ref name="reach">'''Halo: Reach''', campaign level ''[[The Pillar of Autumn (Halo: Reach level)|The Pillar of Autumn]]''</ref> However, the Spartan was killed by a [[Sangheili Zealot]], prompting [[SPARTAN-B312]] to commandeer the cannon and successfully delay the Covenant assault on the ''Autumn'' by crippling an incoming {{Pattern|Ket|battlecruiser}} with a shot to its ventral [[energy projector]].{{Ref/Reuse|reach}}
 
The UNSC's postwar prototype flagship, {{UNSCShip|Infinity}}, is equipped with a number of dorsal turrets quite similar to the Mark 2488. During the initial skirmishes on the [[Forerunner]] [[shield world]] [[Requiem]] in [[2557]], these turrets were used to fend off the [[Didact]]'s [[Cryptum]], forcing the Didact to retreat.<ref>'''Halo 4''', campaign level ''[[Infinity (level)|Infinity]]''</ref> Several automated Onagers were mounted across [[Ivanoff Station]] and were used by the UNSC forces to defend the [[Composer]] from invading [[Covenant remnant]] forces under the Didact, including the Didact himself.<ref>'''Halo 4''', campaign level ''[[Composer (level)|Composer]]''</ref>


==Trivia==
==Trivia==
*The Onager named after a [[Wikipedia:Onager (siege weapon)|medieval siege weapon]], which in turn takes its name from a [[Wikipedia:Onager|horse species]].
*The Onager is named after a [[Wikipedia:Onager (siege weapon)|medieval siege weapon]], which in turn takes its name from a [[Wikipedia:Onager|horse species]].
*On the ''Bungie.net'' weapons statistics page, the description for the Onager is simply "I need a weapon", a reference to a line by [[John-117]] in the opening cinematic of the level ''[[Cairo Station (level)|Cairo Station]]'' in ''[[Halo 2]]''.
*On the ''Bungie.net'' weapons statistics page, the description for the Onager is simply "I need a weapon", a reference to a line by [[John-117]] in the opening cinematic of the level ''[[Cairo Station]]'' in ''[[Halo 2]]''.
*"S-239" is painted on the Onager's frame. This is a reference to Emile-A239, who was killed while operating the weapon.
*"S-239" is painted on the Onager's frame. This is a reference to [[Emile-A239]], who was killed while operating the weapon. Also, "S-266" is painted on the left side. That is a reference to [[Jun-A266]].
*The "[[using Onager early]]" glitch can be exploited so that a player can reach the driver before the scripted cutscene. This glitch can provide a player with an easy killing spree by shooting down [[Banshees]], or avoiding enemy lances by shooting the Phantoms carrying them.
*The "[[using Onager early]]" glitch can be exploited so that a player can reach the driver before the scripted cutscene. This glitch can provide a player with an easy killing spree by shooting down [[Banshees]], or avoiding enemy lances by shooting the Phantoms carrying them.


==Gallery==
==Gallery==
<gallery>
<gallery>
File:HR_Onager_Early_Concept.jpg|An early concept for the Onager by [[Isaac Hannaford]].
File:HR_Onager_Concept.jpg|The cannon's final design.
File:HaloReach - Mass Driver Cannon.jpg|A first-person view of the Onager.
File:HaloReach - Mass Driver Cannon.jpg|A first-person view of the Onager.
File:Onager.jpg|The Onager installed in the Aszod ship breaking yards.
File:Onager.jpg|The Onager installed in the Asźod ship breaking yards.
File:HaloReach - MACrusher.jpg|The Onager, manned by SPARTAN-B312, firing a round at the incoming Covenant ''CCS''-class battlecruiser.
File:HaloReach - MACrusher.jpg|The Onager, manned by SPARTAN-B312, firing a round at the incoming Covenant ''Ket''-pattern battlecruiser.
File:HReach-PillarOfAutumn-MDC.jpg|The Onager discharging a ferric-tungsten slug at the Covenant ''CCS''-class battlecruiser.
File:HReach-PillarOfAutumn-MDC.jpg|The Onager discharging a ferric-tungsten slug at the Covenant ''Ket''-pattern battlecruiser.
File:Onager_charging.jpg|An Onager's electromagnetic coils charging before it fires.
File:Onager_charging.jpg|An Onager's electromagnetic coils charging before it fires.
File:Onager_controls.jpg|The control booth of an Onager cannon.
File:Onager_controls.jpg|The control booth of an Onager cannon.
File:IH_Onager.jpg|An early concept for the Onager by [[Isaac Hannaford]].
File:RD_Onager.jpg|The cannon's final design.
File:Onager.png|A blueprint for the Onager.
File:Onager.png|A blueprint for the Onager.
</gallery>
</gallery>
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==List of appearances==
==List of appearances==
*''[[Halo: Reach]]'' {{1st}}
*''[[Halo: Reach]]'' {{1st}}
*''[[Halo 4]]''


==Sources==
==Sources==
<references/>
{{Ref/Sources}}
 
{{UNSC heavy weapons}}
{{UNSC heavy weapons}}
[[Category:Magnetic acceleration weapons]]
[[Category:Magnetic acceleration weapons]]
[[Category:Artillery]]
[[Category:Artillery]]
[[Category:UNSC ground weapons]]
[[Category:UNSC ground weapons]]

Latest revision as of 13:43, August 6, 2023

Mark 2488 Magnetic Accelerator Cannon
HReach-OnagerMDC.png
Production overview

Manufacturer:

Misriah Armory

Type:

Magnetic Accelerator Cannon

Specifications

Length:

32.6 meters (106.9 ft)[1]

Width:

14.1 meters (46.2 ft)[1]

Height:

10 meters (33 ft)[1]

Weight:

93.4 tonnes (103 tons)[1]

Ammunition type:

15 cm M895 HV/FTHPP (1.1 gigajoules per hit)[1][2]

Operation:

Electromagnetic linear motor

Rate of fire:

20 rounds a minute

Muzzle velocity:

High

Effective range:

Long

Service history

In service:

Human-Covenant War

 

The Mark 2488 Magnetic Accelerator Cannon, formally designated 15 cm Mark/2488 1.1GJ MAC, also known as the Onager and often referred to as a "mass driver", is a stationary Magnetic Accelerator Cannon used by the United Nations Space Command during the Human-Covenant War.[3]

The Mark 2551/25cm Portable is an upgraded variant of the weapon brought into service after the war.

Design details[edit]

The Onager is capable of firing a 15 cm ferric-tungsten hollow-point round with up to 1.1 gigajoules of kinetic energy.[3] It has five linearly arranged magnetic coils, each of which needs to charge individually before each shot. The weapon needs to cool off after every shot, and does so by opening a radial vent on the upper portion of the barrel. The weapon is operated from a small booth on the left side of the cannon.[4]

Operational history[edit]

During the Fall of Reach, a group of UNSC Marines installed an Onager on top of one of the planet's ship-breaking facilities in Asźod to protect the drydocked UNSC Pillar of Autumn. Emile-A239 manned the mass driver to fend off incoming Covenant Banshees and Phantoms before the Autumn could take off.[4] However, the Spartan was killed by a Sangheili Zealot, prompting SPARTAN-B312 to commandeer the cannon and successfully delay the Covenant assault on the Autumn by crippling an incoming Ket-pattern battlecruiser with a shot to its ventral energy projector.[4]

Trivia[edit]

  • The Onager is named after a medieval siege weapon, which in turn takes its name from a horse species.
  • On the Bungie.net weapons statistics page, the description for the Onager is simply "I need a weapon", a reference to a line by John-117 in the opening cinematic of the level Cairo Station in Halo 2.
  • "S-239" is painted on the Onager's frame. This is a reference to Emile-A239, who was killed while operating the weapon. Also, "S-266" is painted on the left side. That is a reference to Jun-A266.
  • The "using Onager early" glitch can be exploited so that a player can reach the driver before the scripted cutscene. This glitch can provide a player with an easy killing spree by shooting down Banshees, or avoiding enemy lances by shooting the Phantoms carrying them.

Gallery[edit]

  • An early concept for the Onager by Isaac Hannaford.

    An early concept for the Onager by Isaac Hannaford.

  • The cannon's final design.

    The cannon's final design.

  • A first-person view of the Onager.

    A first-person view of the Onager.

  • The Onager installed in the Asźod ship breaking yards.

    The Onager installed in the Asźod ship breaking yards.

  • The Onager, manned by SPARTAN-B312, firing a round at the incoming Covenant Ket-pattern battlecruiser.

    The Onager, manned by SPARTAN-B312, firing a round at the incoming Covenant Ket-pattern battlecruiser.

  • The Onager discharging a ferric-tungsten slug at the Covenant Ket-pattern battlecruiser.

    The Onager discharging a ferric-tungsten slug at the Covenant Ket-pattern battlecruiser.

  • An Onager's electromagnetic coils charging before it fires.

    An Onager's electromagnetic coils charging before it fires.

  • The control booth of an Onager cannon.

    The control booth of an Onager cannon.

  • A blueprint for the Onager.

    A blueprint for the Onager.

List of appearances[edit]

Sources[edit]

  1. ^ a b c d e Halo Encyclopedia (2022 edition), page 182
  2. ^ Halo: The Essential Visual Guide, page 114
  3. ^ a b Bungie.net Halo: Reach game stats
  4. ^ a b c Halo: Reach, campaign level The Pillar of Autumn

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