Spacecraft Anomaly Data A data base of spacecraft anomalies has been started at the Solar- Terrestrial Physics Division of the National Geophysical Data Center in 1984. It included the date, time, location, and other pertinent information about incidents of spacecraft operational irregularity due to the environment. These events range from minor operational problems which can be easily corrected to permanent spacecraft failures. The data base includes spacecraft anomalies in interplanetary space and in near-earth orbit but it's main component comes from geostationary spacecraft. Many spacecraft are identified by aliases in order to preserve confidentiality, these are prefaced with the "@" character. Anomaly contributions slowed to a trickle and ceased in the early 1990s. The orginal database files have been converted to Excel Spreadsheets, however, here are the original column and field definitions. SPACECRAFT ANOMALY DATA FORMAT Version 5 / September 2, 1988 Column Fmt Description ---------------------------------------------------------------------------- 1 A1 Format version. 2- 9 I8 Date that this anomaly report was entered (CCYYMMDD) 10- 19 A10 Spacecraft identification, i.e GOES-2, @AA0301, @AA0302. Alias spacecraft identifications should be 7 digits: 1 = @, Digit 2-3 = Contributors ID, 4-5 = spacecraft family, 6-7 = sequence # within the family. 20- 27 I8 Date of anomaly (CCYYMMDD Universal Time) 28- 31 A4 Start time of anomaly, 9999 = no time (HHMM Universal Time) 32- 34 I3 Uncertainty in time (Minutes) 35- 38 I4 Duration (Minutes) 39- 42 A4 Time of anomaly (HHMM Local Time) 43 A1 Orbit type, G= geostationary, P= polar circular, E= elliptical, I= inclined, etc. 44 A1 N= North, S= South for following latitude, blank => no Lat. 45- 46 I2 Geographic latitude of sub-orbit point at anomaly start. 47- 48 I2 Uncertainty in latitude (Degrees) 49 A1 E= east, W= west for following longitude, blank => no Lat. 50- 52 I3 Geographic longitude of sub-orbit point at anomaly start. 53- 54 I2 Uncertainty in longitude (Degrees) 55- 59 I5 Altitude (Kilometers) 60- 64 A5 Anomaly type, what was the anomalous behavior? The coded definitions will evolve as needed. PC : Phantom Command - uncommanded status change. PF : Part Failure. TE : Telemetry Error. SE : Soft Error, recoverable bit flip type error. HE : Hard Error, permanent chip damage or Latch-Up. SS : System Shutdown. ESDM : ElectroStatic Discharge Measured (SCATHA specific). ATT : Attitude Control Problem. UNK : Unknown. 65- 69 A5 Anomaly diagnosis, what type of event caused the anomaly? The coded definitions will evolve as needed. ECEMP : Electron Caused ElectroMagnetic Pulse. Internal, Deep dielectric charging ESD : ElectroStatic Discharge. Surface charging SEU : Single Event Upset, Solar or Galactic Cosmic Rays. MCP : Mission Control Problem, human induced or software error. RFI : Radio Frequency Interference. UNK : Unknown diagnosis. 70-148 A79 Comment related to the anomaly 149-151 I3 Sun-Vehicle-Earth angle in degrees. 152 A1 S = spin stabilized, A = 3-Axis stabilized.