TRACKER-1
48.8566°N / 2.3522°E
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NI
Space telescopes·NASA

NICER

ActiveLaunched in 2017·Aboard the ISS

An X-ray detector mounted outside the International Space Station, measuring the size and behaviour of neutron stars — the densest known objects.

Main objectives
  • Measure the radius of neutron stars.
  • Monitor X-ray bursts from pulsars and magnetars.
  • Detect exoplanet X-ray transits.
Did you know?

NICER relies on the GPS satellite fleet: it uses their clocks to time each photon to within a few nanoseconds.

Timeline

Jun 03, 2017
Launch

Falcon 9 lift-off from Kennedy Space Center, bound for the ISS.

Jun 14, 2017
Installed on the ISS

Mounted outside the International Space Station.

Dec 12, 2019
Neutron-star radius

First precise radius measurement of pulsar J0030+0451.

NICER
Photo of NICER
Mission data
StatusActive
PositionAboard the ISS
Launched in2017
TargetNeutron stars
Budget0.08B USD

Instruments

[01]
XTI

56 X-ray concentrators coupled to timing detectors.

Specifications

Mass372 kg
TimingTiming to ~100 ns
PositionISS exterior

Discoveries

[01]

Official sources

NASA NICER↗