XRISM
XRISM is a Japanese-led X-ray astronomy mission launched in 2023 with major NASA and ESA participation. Its Resolve instrument uses a microcalorimeter to measure the energy of individual X-ray photons with very high precision, enabling detailed studies of hot gas around black holes, galaxy clusters and stellar explosions.
Object identity
- NORAD ID
- 57800
- COSPAR ID
- 2023-137A
- Operator
- Not listed
- Country
- Not listed
- Launch date
- Not listed
Immediate discovery
Why this satellite matters
A microcalorimeter turns a photon's energy into an extraordinarily small temperature rise. The physics connects photon energy, heat capacity and precision thermometry at very low temperatures.
Understanding the mission
Science and engineering ideas
A microcalorimeter turns a photon's energy into an extraordinarily small temperature rise. The physics connects photon energy, heat capacity and precision thermometry at very low temperatures.
Mission
Mission and purpose
The current public orbital catalog identifies this object, but verified mission-specific information may be limited. TransitSatellite will expand this page when authoritative information is available.
- A microcalorimeter turns a photon's energy into an extraordinarily small temperature rise. The physics connects photon energy, heat capacity and precision thermometry at very low temperatures.
Design
Engineering
A microcalorimeter turns a photon's energy into an extraordinarily small temperature rise. The physics connects photon energy, heat capacity and precision thermometry at very low temperatures.
Real orbital values
The mathematics
The current two-line element set reports approximately 15.1315 revolutions per day. Dividing 1,440 minutes by that value gives an estimated orbital period of 95.2 minutes.
Period
95.2 min
Representative speed
27,353 km/h
Representative altitude
534 km
Inclination
31°
Launch record
Launch and deployment
XRISM launched on 7 September 2023 Japan time aboard an H-IIA from Tanegashima, sharing the mission with the SLIM lunar lander.
Orbit
LEO orbit explained
Low Earth orbit is the region closest to Earth used by most crewed spacecraft, many science missions, Earth-observation satellites, and large constellations. Objects move quickly and commonly complete an orbit in roughly 90 to 130 minutes.
LEO can provide detailed Earth views, lower communications delay, and easier access than higher orbits, but it covers less area per spacecraft and is more affected by atmospheric drag.
Live TransitSatellite experience
See XRISM moving now
Open the live tracker to view its current calculated position, trajectory, orbital information, visibility tools, and Save and Share controls.
Learning
Questions to explore
- What can an orbit tell us before the mission is fully identified?
- Why are stable catalog identifiers important?
Evidence
Sources and data notes
Current identity and orbital elements come from CelesTrak’s public GP data. Calculated orbit values are derived from the current TLE and may change after catalog updates. Mission-history claims are added separately and require authoritative sources.
Catalog updated
Sep 20, 2026, 2:43 AM UTC
Story review
1970-01-01T00:00:00.000Z