House station trajectory knowledge now accessible

House Station trajectory knowledge is now accessible to the general public! This knowledge, known as an ephemeris, is generated by the ISS Trajectory Operations and Planning Officer (TOPO) flight controllers within the Mission Management Heart at NASA’s Johnson House Heart. TOPO retains monitor of the place the ISS is, the place it will be, and most significantly makes positive it is not susceptible to colliding with different objects in area.

At ISS’s altitude, a really skinny environment continues to be current. This skinny environment creates drag and over time may cause TOPO’s predicted ISS trajectory to build up errors. Due to this, TOPO updates the expected trajectory roughly thrice every week, so the ISS Flight Management Workforce has the most effective trajectory estimate attainable. An correct trajectory is important for sustaining communications hyperlinks, planning visiting automobile rendezvous, and guaranteeing ISS’s path is evident of any potential collisions.

The hyperlinks are to probably the most present posted ephemeris. The ephemeris is within the CCSDS Orbital Ephemeris Message (OEM) normal and is obtainable in .txt and .xml file codecs. Every file accommodates header strains with the ISS mass in kg, drag space in m², and drag coefficient utilized in producing the ephemeris.

The header additionally accommodates strains with particulars for the primary and final ascending nodes inside the ephemeris span. Following this can be a itemizing of upcoming ISS translation maneuvers, known as “reboosts,” and visiting automobile launches, arrivals, and departures.

After the header, ISS state vectors within the Imply of J2000 (J2K) reference body are listed at four-minute intervals spanning a complete size of 15 days. Throughout reboosts (translation maneuvers), the state vectors are reported in two-second intervals. Every state vector lists the time in UTC; place X, Y, and Z in km; and velocity X, Y, and Z in km/s.

Orbit Ephemeris Message (OEM)

Customers of this knowledge ought to monitor this web page for info concerning any future modifications to the file format. Previous knowledge postings will be discovered archived on data.nasa.gov by looking “ISS COORDS.”