Installation 09

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Installation 09
HW2 I04C.png
Operation overview


Halo Installation


Galactic sterilization

Date of construction:

Between December 2552 and March 2559


Structural information


10,000 kilometres (6,200 mi)[2][3]

Surface width:

318 kilometres (198 mi)[2][3]


.992G (approx)[2]

Surface temperature:

-23°C to 40°C (-9°F to 104°F) (controlled)[2]

Atmospheric composition:

1 (N2, O2)[2]


"I discovered the Ark keeps an almost finished ring in its central forges at all times. It's an emergency replacement in case one of the other rings breaks down."
Ellen Anders on the Halo.[4]

Installation 09[5] or Anders' Ring after its discoverer during the battle for the Ark in 2559,[6] is a Halo installation which was constructed at the Ark after the destruction of the previous replacement for the original Installation 04.[4][7]


As with Installation 08 before it, Installation 09 is a replacement for the original Installation 04, designated Alpha Halo. Within the Halo Array's firing sequence, Alpha Halo is the first ring to fire, and the destruction of the original Alpha ring in 2552 left a gap in the array that required filling. As a replacement for Installation 04, Installation 09 follows Installation 08 in having an overall design extremely similar in nature to the original ring, with only a few minor superficial differences.[7]



Replacing a replacement[edit]

In the final months of the Human-Covenant War, Installation 00 constructed a replacement for Installation 04, which had been destroyed by John-117 during the Battle of Installation 04. The still-incomplete replacement ring, Installation 08, was launched from the Ark's Foundry during the war's final battle, but was subsequently destroyed by its own premature firing, initiated by the Master Chief and Cortana in order to sterilize a Flood incursion on the Ark. The ring's firing severely damaged the Ark, though the massive installation was able to repair itself in time, and March 2559, the Ark's Foundry had finished constructing a new replacement ring, Installation 09.[4]

The existence of Installation 09 was known to United Nations Space Command forces by 2558, thanks to the monitoring of the Henry Lamb Research Outpost on the Ark, which reported that the new ring had entered construction within the Foundry.[8]


Main articles: Second Ark Conflict, Battle of Installation 09

During the battle between the United Nations Space Command forces of the UNSC Spirit of Fire and the Banished occupying the Ark, the newly built replacement Halo was discovered by Professor Ellen Anders. Consequently, she and Captain James Cutter formulated a plan to deploy the ring to the Soell system, Installation 04's former site, where it could be used to raise a distress beacon to the UNSC.[4] The plan was not approved until Isabel proposed a plan to destroy Banished's assault carrier Enduring Conviction when it launched an assault on UNSC Spirit of Fire after Decimus was defeated.[4] After succeeding in destroying the flagship, Anders went to the Foundry and activated the installation, prompting Atriox to order all available units to take the ring from the UNSC. While the Banished contested the UNSC for control of the new Halo, the humans gained a foothold, allowing Anders to enter the control room where she successfully disarmed the ring's firing mechanism and manipulated its gravity anchors to eject a section of the Halo's landmass housing Banished forces into space. Although the UNSC forces evacuated to their ship, Anders could not make it out of the control room in time before Installation 09 entered a slipspace portal to the Soell system. En route to its destination, however, the Halo was intercepted by a Guardian.[1]


List of appearances[edit]


  1. ^ a b Halo Wars 2, campaign level Last Stand
  2. ^ a b c d e Halo: The Essential Visual Guide, page 6: Statistics provided for Alpha Halo are relevant for all Neoteric Halo rings.
  3. ^ a b Halo Encyclopedia (2022 edition), page 340
  4. ^ a b c d e Halo Wars 2, campaign level Hold the Line
  5. ^ Reddit, Return to the denomination. Installation 04 (B), (C). Canonically. 343 PLS: "Sorry, 08 and 09 make way more sense :-)
    In actuality, they aren't meant to directly replace an individual ring, but to replace the loss in coverage that ring offered the galaxy."
    - Jeff Easterling (Retrieved on Jan 14, 2024) [archive]
  6. ^ YouTube - HALO, Halo Lore Stream: The Halo Array: 42:47 (Retrieved on Mar 8, 2024)
  7. ^ a b Halo Encyclopedia (2022 edition), page 357
  8. ^ Halo: Official Spartan Field Manual, page 99