Useful Mission Documents


References
Tolson, R., et al., Application of Accelerometer Data to Mars Odyssey Aerobraking and Atmospheric Modeling, Journal of Spacecraft and Rockets, Vol 42, No. 3, pp. 435-443, 2005

Description of the DATA

For each drag pass (spanning orbits 10 - 336 of the mission) there is an individual ASCII Profile file containing derived density values at 1-second intervals for a time period spanning several hundred seconds centered upon the periapse time. There is also a separate ASCII Altitude file which provides derived density and scale height values at specified altitudes (100 km, 110 km, etc.) for both the inbound and outbound portions of the orbit/drag pass as well as at the periapsis altitude, and 1.26 nanobar pressure level during both the inbound and outbound portions of the orbit/drag pass

The data contained within the Ody aerobraking pds archive odya_0001 are provided in either the Altitude or Profile folders within the DATA folder. Within both the Profile and Altitude folders a user will find subfolders containing ~100 drag passes of data, with each drag pass consisting of a single ASCII file. For instance, the data presented in the left figure above are from the L2P120.TAB file located within the P100_199 folder within the Profile folder, while the data presented in the right-side figure above are located in the L3P120.TAB file located in the P100_199 folder located within the Altitude folder. RAW ODY accelerometer data are also available within their own folder below the Data folder. The contents and structure of the TAB files are described within text within those data file.

Retrieving the data bundle


Calibrated Data


Data can be retrieved at the file level - download the index, (csv) select the desired files and submit a list of URNs. to retrieve the data Link this to a page to retrieve the data.

Example of Data (Partial file)

Orbit 99

Time from Periapse (sec)			Latitude (deg)			Longitude (deg)			Local Solar Time (hr)			Solar Zenith Angle (deg)			Altitude (km)			Density (kg/km**3)			Sigma Density (kg.km**3
-328.9			72			244.7			3			125.9			205.37			-0.103			0.627
-327.9			72.1			244.6			3			125.8			204.73			0.054			0.627
-326.9			72.1			244.6			3			125.8			204.08			-0.288			0.629
-325.9			72.2			244.5			3			125.8			203.45			0.062			0.627
-324.9			72.3			244.5			2.9			125.7			202.81			-0.06			0.627
-323.9			72.3			244.4			2.9			125.7			202.17			-0.037			0.627
-322.9			72.4			244.4			2.9			125.7			201.54			-0.051			0.627
-321.9			72.5			244.3			2.9			125.7			200.91			0.196			0.628
-320.9			72.5			244.3			2.9			125.6			200.28			-0.208			0.628
-319.9			72.6			244.2			2.9			125.6			199.65			0.214			0.628
-318.9			72.7			244.2			2.9			125.6			199.02			-0.111			0.627
-317.9			72.7			244.1			2.9			125.5			198.4			0.126			0.627
-316.9			72.8			244.1			2.9			125.5			197.78			-0.268			0.629
-315.9			72.9			244			2.9			125.5			197.16			0.238			0.629
-320.9			72.5			244.3			2.9			125.6			200.28			-0.208			0.628
-319.9			72.6			244.2			2.9			125.6			199.65			0.214			0.628
-318.9			72.7			244.2			2.9			125.6			199.02			-0.111			0.627
-317.9			72.7			244.1			2.9			125.5			198.4			0.126			0.627
-316.9			72.8			244.1			2.9			125.5			197.78			-0.268			0.629
-315.9			72.9			244			2.9			125.5			197.16			0.238			0.629
-314.9			72.9			244			2.9			125.4			196.54			-0.137			0.628
-313.9			73			243.9			2.9			125.4			195.92			0.195			0.628
-312.9			73.1			243.9			2.9			125.4			195.3			-0.059			0.627
-311.9			73.1			243.8			2.9			125.4			194.69			0.016			0.626

Accelerometer Altitude data description
Accelerometer Altitude data


Data can be retrieved at the file level - download the index, (csv) select the desired files and submit a list of URNs to retrieve the data Link this to a page to retrieve the data.

Orbit 99

Example of Data

			Altitude (km)			Latitude (deg)			Longitude (deg)			Local Solar Time (hr)			Longitude of Sun (deg)			Solar Zenith Angle (deg)			Density (kg/km**3)			Sigma Density (kg/km**3)			Scale Height (km)			Sigma Scale Height (km)
Periapse			96.2			83.28			107.74			17.92			291			113.39			71.69			0.01			7.37			0.52
1.26 nbar inbound			115.03			84.58			210.33			0.72			291			118.97			3.87			0.05			9.36			0.3
1.26 nbar outbound			122.33			72.29			85.7			16.49			291			105.93			4.72			0.11			7.72			0.48
inbound			100			-1			-1			-1			-1			-1			-1			-1			-1			-1
outbound			100			-1			-1			-1			-1			-1			-1			-1			-1			-1
inbound			110			85.52			200.31			0.06			291			118.23			6.83			0.26			7.96			0.82
outbound			110			75.32			88.43			16.66			291			107.96			21.85			0.46			9.71			0.68
inbound			120			83.64			220.22			1.38			291			119.69			2.15			0.05			7.75			0.52
outbound			120			72.77			86.05			16.52			291			106.26			6.39			0.04			7.34			0.11
inbound			130			81.84			228.93			1.95			291			120.83			0.54			0.01			6.99			0.2
outbound			130			70.71			84.56			16.42			291			104.87			1.82			0.02			8.08			0.24
inbound			140			80.19			233.81			2.27			291			121.78			0.14			0.01			7.47			1.36
outbound			140			68.94			83.48			16.36			291			103.68			0.51			0.01			7.89			0.28

Raw Data

Similar aerobraking archives are available for the MGS and MRO orbiter missions.