On Sept. 18, propulsion engineers finished filling Lucy’s fuel tanks with approximately 1,600 pounds (725 kilograms) of liquid hydrazine and liquid oxygen, which make up 40% of the mass of the spacecraft. The fuel will be used for precise maneuvers that will propel Lucy to its asteroid destinations on schedule, while the solar arrays – each the width of a school bus – will recharge the batteries that will power spacecraft instruments.

Source: https://www.scientiststudy.com/2021/09/nasas-lucy-mission-prepares-for-launch.html

The probe is fuelled by 725 kg of liquid hydrazine and liquid oxygen, making up 40% of its mass.

Source: https://spacewatch.global/2021/10/nasas-lucy-to-probe-trojan-asteroids/

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Source: https://english.lokmat.com/technology/nasas-lucy-mission-prepares-for-launch-to-trojan-asteroids/

Is Lucy really fueled with cryogenic liquid oxygen?

The combination of hydrazine and dinitrogen tetroxide is used very often for space probes that should work for several years requiring fuels that are liquid at non cryogenic temperatures.

  • 1
    $\begingroup$ I'd say this is a duplicate of the unanswered space.stackexchange.com/questions/49947/… $\endgroup$
    – asdfex
    Oct 8, 2021 at 14:24
  • 2
    $\begingroup$ Do we need a "misleading/wrong press release" tag? There have been several questions about them. $\endgroup$ Oct 8, 2021 at 14:37
  • 1
    $\begingroup$ You don't need to add all these sources, just link to the original press release: nasa.gov/press-release/… $\endgroup$
    – asdfex
    Oct 8, 2021 at 14:40
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    $\begingroup$ related: space.stackexchange.com/q/33970/40257 $\endgroup$ Oct 8, 2021 at 14:45
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    $\begingroup$ @BrendanLuke15 The datasheet does specify the oxidiser MON, a solution of nitric oxide (NO) in dinitrogen tetroxide/nitrogen dioxide (N2O4 and NO2). So liquid oxygen is wrong. What about writing an answer? $\endgroup$
    – Uwe
    Oct 8, 2021 at 17:10


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