Sample Descriptions

The descriptions contain the name, size or amount, analysis history, storage, condition availability of the Bennu Sample AO, and scientific reference information related to the sample.

Bennu Sample Database System (BS-DBS) on the Data Archives and Transmission System (DARTS) by the JAXA curation

Item Definition
Sample name The naming convention for Bennu samples by JAXA will uniquely identify them in the format "XXX-YYYYY-ZZ" as the Sample ID. This system is intended for sample management and not for hardware management. For example, there is no plan to assign a Sample ID to the transport containers received from JSC. First 3 characters: Represent the project name. OSIRIS-REx is ORX, Hayabusa is HY1, Hayabusa2 is HY2, and MMX is MMX. These are represented using uppercase letters or numbers. Next 5 digits: Represent the sample ID in numerical form. The leftmost digit is used to identify samples allocated by NASA. Contact pads are assigned #0, and bulk samples are assigned numbers #1 to #5 based on dish numbers prepared by JAXA. The second digit from the left is used as a control number, with #9 indicating bulk samples (mother bottles). The remaining 3 digits are incrementally assigned for individual sample identification. Last 2 digits: Represent the subsample ID, indicated by numbers
Tentative name A temporal/unofficial name or nickname of the sample that requires no specific format. This is given for traceability of the sample handling record because some samples are handled with a temporal name before being given the official sample name
Source The original sample number of the source sample, provided by JSC/NASA, of the sample was recovered
Sample form The form of the sample, such as “individual particle,” “aggregate,” “gas,” and “previously allocated sample.” The previously allocated sample indicates that the sample has been analyzed after the initial description and the general term for “polished section,” “FIB section,” and so on
Condition The current sample condition (pristine or not). The term “pristine” here implies that the sample has not been exposed to air nor experienced any destructive analysis but has only undergone the initial description measurements (e.g., optical microscope, MicrOmega and FT-IR)
Category An identifier of the sample type (1: Bennu material, 2: others such as potential contaminants)
Initial weight (mg) The sample weight (mg) measured in the JAXA clean chamber for the first time
Weight (mg) The sample weight (mg) is given here if it was remeasured after the initial measurement
Size: long length (mm) The maximum caliper length of an individual particle (mm) measured on a microscope image captured in the clean chamber. This information is given only for individual particles, not for aggregates
Size: short length (mm) The minimum caliper length, of an individual particle (mm) measured on a microscope image captured in the clean chamber. This information is given only for individual particles, not for aggregates
Size: height (mm) The height (mm) measured by focusing on the top and bottom of the particle using the optical microscope. This information is given only for individual particles, not for aggregates
Status The current sample status (on-loan, transfer, lost, or consumed). The term “consumed” means consumption of a sample by a destructive analysis
Measurement history A brief description of analysis records
Distribution history A brief description of distribution records
Container The ID of the sample dish
Storage The name of current sample storage
Quality An identifier of the level and a brief description of the sample’s cleanliness. Class-1 or -2 indicates the cleanliness level. Three capital letters in a bracket after the class number describe the environmental conditions that the sample has been exposed to, with three ranks from A–C. For example, “Class-1 (AAA)” describes the best conditionsClass-1 or -2 indicates the cleanliness level1: the sample has been handled with the standard process2: the sample has been handled with a nonstandard process (e.g., the sample was accidentally touched with a Teflon material.)Three capital letters indicate the environmental conditions with three ranks from A–CThe first letter explains the atmospheric conditionA: under vacuum or purified nitrogen conditionB: other gassesC: atmospheric air on the earthThe second letter explains the contact materials of the sampleA: quarts glass, sapphire glass, stainless steel, and aluminumB: TeflonC: other materials (such as Viton)The third letter explains the cleaning process of the contact materials of the sampleA: a combination process of ultrasonic, degreasing, alkali solvent, and ozone cleaningB: a combination of ultrasonic cleaning and degreasingC: other cleaning methods or no cleaning
Description Brief description about the sample
Reference Access to the published papers related to this sample
Data source Access to directories of the DARTS file server for the entire processed analytical data of the sample
Family tree (Parent and child) A description of the relationship among the sample, the sample source (mother sample), and the sub-sample. There are several parent samples when th

 

Analytical Data Descriptions

There are six types of measurements derived from the Initial Description (Yada et al. 2022): (1) microbalance; (2) microscopic imaging; (3) FT-IR (Hatakeda et al. 2023); (4) MicrOmega (Pilorget et al. 2022); (5) multi-band spectroscopy (Cho et al. 2022); and (6) stereo-imaging system (Cho et al. 2022)

Bennu Sample Database System (BS-DBS) on the Data Archives and Transmission System (DARTS) by the JAXA curation

Measurement Item Definition
Optical microscope Date and time The date and time when the measurement was performed
Sample length long (mm) The maximum caliper length of an individual particle (mm) measured on a microscope image captured in the clean chamber. This information is given only for individual particles, not for aggregates
Sample length short (mm) The minimum caliper length, of an individual particle (mm) measured on a microscope image captured in the clean chamber. This information is given only for individual particles, not for aggregates
Sample length height (mm) The sample length (mm) measured by focusing on the top and bottom of the particle using the optical microscope. This information is given only for individual particles, not for aggregates
Image A microscopic image of the sample captured by the microscope system
Scaled image A microscopic image of the sample with two lines representing a long and a short length of the sample, respectively
Comment A remark for the measurement or data
Weight Date and time The date and time when the measurement was performed
Total weight (mg) The sample weight (mg), including the sample dish weight, measured by the electric balance in the clean chamber. This is an average of five weight measurements
Sample dish weight (mg) The sample dish weight (mg) measured by the electric balance in the clean chamber. This is an average of five measurements
Sample weight (mg) The sample weight (mg), excluding the sample dish weight, measured by the electric balance in the clean chamber. This is an average of five weight measurements
Sample weight error (mg) The standard deviation as a measurement error of the sample weight (mg) calculated
Dish The ID of the sample dish
Comment A remark for the measurement or data
FT-IR Date and time The date and time when the measurement was performed
Spectrum image A spectrum chart of the sample measured by the FT-IR system. The chart shows the relative reflectance intensity per wavelength (mm)
ROI image Images file of the sample taken by the FT-IR system. This optical image shows the measured region of interest by the laser guide from the FT-IR system
ROI light image Images file of the sample taken by the FT-IR system. This optical image shows the measured region of interest by the laser guide and the supplemental light from the FT-IR system
CSV file A CSV file of the spectrum image, including the information on measurement conditions
Comment A remark for the measurement or data
MicrOmega Date and time The date and time when the measurement was performed
Position The number of the measurement position. When the target sample is larger than the field of view of MicrOmega, this position number is used to identify the measurement area during measurement
Angle (°) The sample’s horizontal rotation angle (degree) on the sample stage. This value is relative and used to identify the measurement position easier during measurement
Monochromatic image Images file of the sample captured by MicrOmega. This is a reflectance intensity map of a single wavelength (2.50 µm )
ROI image Where available, image file of the sample captured by MicrOmega. The image shows the region of interest in color
ROI spectrum image Where available, a chart of the average reflectance spectrum of the region of interest displayed in the ROI image measured by MicrOmega,
ROI spectrum CSV Where available, a CSV file of the average reflectance spectrum of the region of interest displayed in the ROI image measured by MicrOmega
Comment A remark for the measurement or data
Multi-band spectroscopy Date and time The date and time when the measurement was performed
Measurement condition CSV A CSV file describing the information of measurement conditions
IF map image Reflectance (radiance factor or I/F) map at 550 nm (v-band) measured with an incidence angle of 30°, emission angle of 0°, and phase angle of 30°. The photometric effect due to the roughness of the sample surface is not corrected. The solid line outlines the particle rim and the dashed line represents the region used to calculate the particle-averaged spectrum
Color ratio image Color map showing the v-to-b band ratio (R550/R480 nm). The solid line marks the particle rim and the dashed line shows the region used to calculate the particle-averaged spectrum
Average spectrum image Particle-averaged spectrum taken by the multi-band spectroscopy system in absolute reflectance (Left) and reflectance normalized at 550 nm (Right). The spectrum of each particle (solid black line) is compared with the brightest (orange dashed line), darkest (green dashed line), most red-colored (red dashed line), and most blue-colored (blue dashed line) particles. Error bars show the measurement uncertainty reported by Cho et al. (2022). The photometric effect due to the roughness of the sample surface is not corrected
Comment A remark for the measurement or data
Stereo imaging Date and Time The date and time when the measurement was performed
Elevation map image Microscopic image (Left) and elevation map (Right) of the particle. The elevation map was calculated from a 3D digital elevation model using a structure from motion technique, and the sample was imaged from multiple angles
Comment A remark for the measurement or data