Hayabusa2 LIDAR level 2 data product: time series topography

Overview

This webpage provides Hayabusa2 LIDAR level 2 data product of time series topography. After estimating the spacecraft trajectory with respect to Ryugu, LIDAR ranges are translated into the topography expressed in the asteroid-fixed frame. A paper describing the trajectory correction has been submitted to Icarus (Matsumoto et al., Improving Hayabusa2 trajectory by combining LIDAR data and a shape model, submitted). Currently available are data obtained between 30 June, 2018 and 7 September, 2018.

Files

Visit this directory for the files of the time series topography.

Naming convention

The files are named as follows;
hyb2_ldr_l2_TLM_topo_ts_YYYYMMDD_v1NN.csv

TLM : Telemetry mode: aocsm or hk.
YYYYMMDD: Year, month, date.
NN: version number used for the internal file sharing purpose with the landing site selection team.

Format description

The time series topography, together with LIDAR ranges and spacecraft position with respect to Ryugu, are presented in csv files with 11 columns.

column 1: SHOT_TIME The UTC time of the laser transmission.
column 2: RANGE The distance between spacecraft and asteroid surface calculated from the counter values of laser emission and reception. The accuracy is 0.5 m for AOCSM and 1.0 m for HK. The internal delay time in the LIDAR is taken into account. Unit is in m.
column 3: TOPO_LONGITUDE The longitude of a laser footprint center position in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in degree.
column 4: TOPO_LATITUDE The latitude of a laser footprint center position in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in degree.
column 5: TOPO_HEIGHT The height of a laser footprint center position with respect to the center of the asteroid in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in meter.
column 6: TOPO_X The X component of a laser footprint center position in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in meter.
column 7: TOPO_Y The Y component of a laser footprint center position in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in meter.
column 8: TOPO_Z The Z component of a laser footprint center position in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in meter.
column 9: SC_POS_X The X component of the spacecraft position in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in meter.
column 10: SC_POS_Y The Y component of the spacecraft position in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in meter.
column 11: SC_POS_Z The Z component of the spacecraft position in the asteroid-fixed coordinates, converted from the inertial coordinates by using asteroid ephemeris, and axis and phase of the asteroid rotation. Unit is in meter.

LIDAR related papers

The following papers would be useful to know more about Hayabusa2 LIDAR.
  1. Namiki, N. et al. in New Results in the Observations and Space Exploration of Asteroids, ed. by W-H. Ip (Macau University of Science and Technology, Macao, 2012), pp. 74-96
  2. Mizuno, T., Kase, T., Shiina, T. et al., Space Sci. Rev. (2016). doi:10.1007/s11214-015-0231-2
  3. Yamada, R., Senshu, H., Namiki, N. et al., Space Sci. Rev. (2016). doi:10.1007/s11214-016-0240-9
  4. Senshu, H., Oshigami, S., Kobayashi, M. et al., Space Sci. Rev. (2016). doi:10.1007/s11214-016-0242-7
  5. Noda, H., Kunimori, H., Mizuno, T. et al., Earth, Planets and Space (2017), doi:10.1186/s40623-016-0589-8