USA-280 (codenamed "Zuma") was a classifiedUnited States governmentsatellite that was launched bySpaceX on 8 January 2018, on the 47th flight of theFalcon 9 rocket.[1][4]The National Reconnaissance Office was in charge of the Zuma project,[5] though its purpose has not been disclosed.[2][6] In November 2017,Northrop Grumman stated that the launch "is a monumental responsibility and has taken great care to ensure the most affordable and lowest risk scenario for Zuma."[7]The Wall Street Journal reported that the design was very sensitive to vibration and sudden shocks, and had a development cost approachingUS$3.5 billion.[8][9]
Following the launch, unnamed sources stated that the satellite was lost during deployment and re-entered the atmosphere,[10] and independent investigations concluded that the spacecraft likely failed to separate from itspayload adapter.[11]
The satellite, manufactured by Northrop Grumman,[7] was initially scheduled to launch on aFalcon 9 fromKennedy Space CenterLaunch Complex 39A (LC-39A) in mid-November 2017, and launch-licenseLLS 17-104 for the rocket was issued by theOffice of Commercial Space Transportation on 9 November 2017.[13] Northrop Grumman purchased a payload adapter to customize the release mechanism, which was then tested three times on the ground prior to payload fairing encapsulation.[8]
The Falcon rocket performed astatic fire test as part of its pre-flight preparation, but results from apayload fairing test for another customer led to a delay of nearly two months.[14] On 22 December 2017, the launch license was re-issued with a change of the launchpad from Launch Complex 39A to Launch Complex 40.[13] The launch was subsequently rescheduled for 4 January 2018, and was further delayed because of weather concerns related to theJanuary 2018 North American blizzard.[15][16]
The satellite was launched on 8 January 2018 at 01:00 UTC fromCape Canaveral Air Force StationSpace Launch Complex 40 (SLC-40) in Florida.[17] The Falcon 9 first stage touched down atLanding Zone 1, and SpaceX later announced that all data indicated the launch vehicle had performed properly.[18] At approximately 03:15 UTC, the pilot of an aircraft traveling overKhartoum, as well as another person inSudan, observed a spiral-shaped fuel dump attributed to the re-entering upper stage.[19][20][21]
The fate of the spacecraft is not publicly known. According to unsourced media claims, U.S. lawmakers were reportedly briefed about the loss of the spacecraft[4] and an unnamed government official said that it had re-entered the atmosphere over theIndian Ocean,[10][22] possibly due to a failure in thepayload adapter provided by Northrop Grumman in detaching from the second stage.[4][23] According toThe Wall Street Journal, sensors had not reported the initial failure to detach.[8] Later on, Zuma did ultimately detach from the upper stage payload adapter, but only after it was too late and with the orbit too low to attempt a rescue of the satellite.[8][9]
President andCOO of SpaceXGwynne Shotwell stated, "For clarity: after review of all data to date, Falcon 9 did everything correctly on Sunday night. If we or others find otherwise based on further review, we will report it immediately. Information published that is contrary to this statement is categorically false. Due to the classified nature of the payload, no further comment is possible."[24] Lon Rains,Communications Director of Northrop Grumman, stated that the company could not comment on the status of classified missions.[4] Three days later, the Zumamission patch had been removed from sale in the souvenir shop at theAir Force Space and Missile Museum and from online sales.[25]
On 8 April 2018,The Wall Street Journal reported that two independent investigations "tentatively concluded" that the spacecraft failed to separate from the payload adapter after launch due to errors introduced by Northrop Grumman. The adapter had been bought by Northrop Grumman from a subcontractor and heavily modified for use on the mission.[11][8] Due to the classified nature of the mission, detailed information on the satellite and its fate may not be publicly released.[26] Officially,North American Aerospace Defense Command (NORAD) still lists the satellite but with no orbital parameters and the orbital status code "noelements available", which is standard procedure for classified missions.[27][28]
The U.S. government has not publicly stated if there was a failure of Zuma,[29] and this secrecy has generated speculations on its purpose and its fate.[30] A number of articles published by the amateur satellite tracking community stated that if the satellite was still in orbit or operating covertly, then it would likely be located visually.[31][32][33] In the process of searching for Zuma, amateur astronomers instead found radio transmissions fromIMAGE, a NASA satellite that was lost in 2005.[34]
^abWong, Kenneth (22 December 2017).License Number: LLS 17-104 (Rev 1)(PDF) (Report). Commercial Space Transportation License.Office of Commercial Space Transportation.Archived(PDF) from the original on 20 August 2018. Retrieved20 August 2018.Zuma mission ... Original Issued: November 9, 2017 ... Rev 1 Issued: December 22, 2017 ... Changed "Launch Complex 39A at Kennedy Space Center (KSC)" to "Launch Complex 40 at Cape Canaveral Air Force Station(CCAFS)"
Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ). Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).
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