The burns were so shorter than expected because Ariane 5 basically targeted the thing perfectly and very little fuel was required for the mid course corrections
The Nancy Grace Roman Space Telescope – or Roman Space Telescope, for short – is a NASA observatory designed to settle essential questions in the areas of dark energy, exoplanets, and infrared astrophysics. The Roman Space Telescope is currently planned for launch in the mid-2020s. The telescope was initially developed as the Wide Field InfraRed Survey Telescope (WFIRST), and renamed in 2020 to honor Nancy Grace Roman, NASA’s first Chief of Astronomy. Roman has been called the “mother” of NASA’s Hubble Space Telescope.
The Roman Space Telescope [*] will have a field of view that is 100 times greater than the Hubble infrared instrument, capturing more of the sky with less observing time. As the primary instrument, the Wide Field Instrument will measure light from a billion galaxies over the course of the mission lifetime. It will perform a microlensing survey of the inner Milky Way to find ~2,600 exoplanets. The Coronagraph Instrument will perform high contrast imaging and spectroscopy of dozens of individual nearby exoplanets. The Roman Space Telescope is designed for a 6 year mission, and will launch on a EELV out of Cape Canaveral.
So… hearing “we used a lot less fuel than we thought we would” makes me think that they may have gotten uncomfortably close to the other safety margin.
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