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‘Darkish universe’ telescope Euclid faces some setbacks throughout commissioning

September 27, 2023
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‘Darkish universe’ telescope Euclid faces some setbacks throughout commissioning
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The European House Company’s (ESA) Euclid area telescope launched from Cape Canaveral on July 1. By all accounts, the launch handed easily. Even when mission management lit up Euclid’s devices and took the telescope’s first check pictures, the whole lot appeared properly. However as with all area mission — and, for that matter, any advanced sufficient endeavor — problems inevitably arose. 

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Euclid’s problems began when its steerage system failed to trace faint stars.

Euclid’s Fantastic Steerage Sensor (FGS) is an equipment that helps orient the telescope. Beneath regular circumstances, the FGS locks onto recognized stars to plot the place the telescope is pointing within the sky. Engineers can exhaustively check the FGS earlier than launch, however actual area situations are very tough to simulate. Floor assessments don’t essentially account for components like cosmic rays that intervene with the machine. 

Mission management prolonged Euclid’s commissioning part with a view to write up a software program replace that addresses the system’s anomaly, and ESA is optimistic that this replace has mounted the issue.

Associated: Who’s the Euclid ‘darkish universe’ area telescope named after?

“I’m relieved to say that preliminary assessments are trying good. We’re discovering many extra stars in all our assessments, and whereas it’s too early to rejoice and extra observations are wanted, the indicators are very encouraging,” Micha Schmidt, Euclid’s operation supervisor, said in a statement.

However that wasn’t the tip of Euclid’s points. 

Considered one of Euclid’s devices often appeared to be choosing up unusual streaks of sunshine. Quickly, ESA mission management discovered the offender: The solar.

Euclid is positioned on the Solar-Earth Lagrange Level 2, sharing this area with NASA’s James Webb House Telescope. Right here, “behind” the Earth, the Solar stays on the telescope’s again, and the telescope lies in Earth’s shadow. To offer Euclid much more safety, the telescope has a sunshield.

However the sunshield didn’t shadow the whole lot.

A part of one among Euclid’s thrusters mirrored a tiny quantity of sunshine that appears to have evaded the sunshield. Euclid’s Visible light instrument (VIS) is delicate sufficient to discern that mirrored mild when the instrument is turned to sure angles. In all, the stray mild pops in round 10 p.c of VIS’s pictures.

How a lot that impacts Euclid’s mission stays an open query.



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