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HAYABUSA2 HAYABUSA KAGUYA AKATSUKI Curation SAKIGAKE Viking Apollo

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Sakigake (MS-T5) Orbit Data

Summary

This page archives the orbit data of Sakigake (MS-T5) for the period between 1985-02-19 and 1997-10-09.

Terms and Conditions

  1. You can freely use the archival data of Sakigake on this site without asking for an explicit permission if the use of the data is for media-reports, academic researches, or education, or if it is for private use.
  2. If your use of these data is for any commercial or business purposes, please contact us at "darts-admin AT ML.isas.jaxa.jp".

Sakigake orbit data files

  1. orb8587_eclp.txt Orbits of Sakigake and the earth (Ecliptic coordinates) 1985-1987 (1 data point per day)
  2. orb9194_eclp.txt Orbits of Sakigake and the earth (Ecliptic coordinates) 1991-1994 (1 data point per 12 hours)
  3. orb9194_eqtr.txt Orbits of Sakigake and the earth (Equator coordinates) 1991-1994 (1 data point per 12 hours)
  4. orb9194_GSE.txt Orbit of Sakigake in the earth-based coordinates (GSE coordinates) 1991-1994 (1 data point per 12 hours)
  5. orb92ja_eclp.txt Orbits of Sakigake and the earth (Ecliptic coordinates) 1992-01-06 – 1992-01-09 (during the passage of the Earth's magnetosphere; 1 data point per hour)
  6. orb92ja_GSE.txt Orbit of Sakigake in the earth-based coordinates (GSE coordinates) 1992-01-06 – 1992-01-09 (during the passage of the Earth's magnetosphere; 1 data point per hour)
  7. orb92ja_GSM.txt Orbit of Sakigake in the earth-based coordinates (GSM coordinates) 1992-01-06 – 1992-01-09 (during the passage of the Earth's magnetosphere; 1 data point per hour)
  8. orb92sp_eclp.txt Orbits of Sakigake and the earth (Ecliptic coordinates) 1992-09-09 – 1992-10-17 (during the passage of the tail of the Earth's magnetosphere; 1 data point per hour)
  9. orb92sp_GSE.txt Orbit of Sakigake in the earth-based coordinates (GSE coordinates) 1992-09-09 – 1992-10-17 (during the passage of the tail of the Earth's magnetosphere; 1 data point per hour)
  10. orb92sp_GSM.txt Orbit of Sakigake in the earth-based coordinates (GSM coordinates) 1992-09-09 – 1992-10-17 (during the passage of the tail of the Earth's magnetosphere; 1 data point per hour)

Description of the Sakigake orbit data

Files orb8587_eclp.txt, orb9194_eclp.txt, orb92ja_eclp.txt, orb92sp_eclp.txt

These list the orbits of Sakigake and the earth (Ecliptic coordinates).

Example of the data file
1985 3 18 0 0 -0.1285849100D+09 -0.8054390000D+07 -0.3114340000D+07
-0.1487426400D+09 0.6898921000D+07 0.3422209500D+03
1985 3 19 0 0 -0.1281220000D+09 -0.1086963800D+08 -0.3123910000D+07
-0.1488822200D+09 0.4316731000D+07 0.3355095200D+03
Format
  • Year(4-digit integer) Space(1x)
  • Month(2-digit integer) Space(1x)
  • Day(2-digit integer) Space(1x)
  • Hour(2-digit integer) Space(1x)
  • Minute(2-digit integer) Spaces(2x)
  • Sakigake orbital position: X (D17.10 (Float number in 17 characters of double exponential format including 10 digits after the decimal point) in [km])
  • Sakigake orbital position: Y (The same as for X)
  • Sakigake orbital position: Z (The same as for X)
  • New-line, Spaces(19x)
  • Earth position: X (D17.10 (Float number in 17 characters of double exponential format including 10 digits after the decimal point) in [km])
  • Earth position: Y (The same as for X)
  • Earth position: Z (The same as for X)

The coordinates are EME50 (i.e., the right-handed ecliptic coordinates in which the origin of the coordinates is at the sun with the X-axis defined as the vector from the earth on the spring equinox toward the sun and Z-axis defined as perpendicular to the ecliptic plane toward the north).

File orb9194_eqtr.txt

The format is the same as above, but in the equatorial coordinates.

Files orb9194_GSE.txt, orb92ja_GSE.txt, orb92sp_GSE.txt

These list the orbit of Sakigake in the earth-based coordinates (GSE coordinates) in units of [km].

Example of the data file
199191 000.1455233377D+08 -0.1107301902D+080.2750523857D+07
1991911200.1440548931D+08 -0.1126439082D+080.2772088867D+07
199192 000.1425871162D+08 -0.1145297199D+080.2793382823D+07
Format
  • Year(4-digit integer) Space(1x)
  • Month(2-digit integer) Space(1x)
  • Day(2-digit integer) Space(1x)
  • Hour(2-digit integer) Space(1x)
  • Minute(2-digit integer) Spaces(2x)
  • Sakigake orbital position: X (D17.10 (Float number in 17 characters of double exponential format including 10 digits after the decimal point) in [km])
  • Sakigake orbital position: Y (The same as for X)
  • Sakigake orbital position: Z (The same as for X)

The coordinates are the GSE coordinates, which are the right-handed system with the origin at the earth, (positive) X-axis pointing towards the sun, and Z-axis perpendicular to the ecliptic plane toward the north.

Files orb92ja_GSM.txt, orb92sp_GSM.txt

These are similar to the above (the GSE ones), but in the GSM coordinates in units of [km]. The format is the same as for the GSE ones, except described in the GSM coordinates.

The GSM coordinates are right-handed. Their origin is at the earth. The X-axis is defined as pointing towards the sun (the same as for the GSE coordinates), but the Y-Z plane is rotated around the X-axis so that the magnetic poles of the earth are sitting on the X-Z plane.

Last Modified: 08 February 2019