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Volume DWNCLVIR_V1B
Dawn VIR VIS Calibrated Level-1B (RDR) Ceres Science LAMO Archive
==============================================================================
Brief Volume Description
==============================================================================
This volume contains the Dawn VIR VIS calibrated level-1B (RDR) cubes from
the Dawn Ceres Science LAMO (CSL) encounter phase (2015-10-23 to 2016-06-19).
These data have been decompressed, decoded, and formatted into scientifically
useful data structures from the original raw telemetry packets. These
products, along with their required PDS documentation, form the level-1a data
sets (EDRs). The EDRs and then calibrated using the procedure defined in
the VIR_CALIBRATION document by using the calibration files found in the
CALIB directory.
All data files are stored in the 'DATA' branch of the directory tree. The
data are organized into subdirectories by phase and activity. DATA
subdirectories are named according to the convention:
yyyymmdd_nnnnn
where:
yyyymmdd = phase/activity start date
nnnnn = phase/activity name
A brief overview of the mission phases and activities (including the start
times and names used in the DATA subdirectories is provided in the 'Dawn
Science Observations' table below.
The data on this volume include both raw data QUBEs and housekeeping data
tables. The data QUBEs are named according to the convention:
VIR_sss_ll_v_sctime_z,
where:
'VIR' = literal
sss = sensor ('IR' or 'VIS')
ll = processing level ('1A' or '1B')
v = clock reset number
sctime = the integral portion of the SC_CLK_START_COUNT
z = data file version
The file extension for the data QUBEs is '.QUB'. The housekeeping data are
stored in ASCII tables ('.TAB' file extension). File naming for the
housekeeping files is:
VIR_sss_ll_v_sctime_HK_z
where the 'HK' is literal and the other elements are identical to those in
the QUBE files. Both the data QUBE and HK files are accompanied by a PDS
label file ('.LBL' file extension), which provides information on the
temporal, geometrical, and instrumental conditions under which the data were
taken.
SPICE kernels are archived by the NAIF Node of the PDS. This volume contains
a collection of SPICE metakernel (TM) files in the GEOMETRY directory. These
TMs contain a list SPICE kernels that were used in processing the VIR data
products, and are referenced in the data product labels.
A more detailed description of volume contents and organization is provided
in the Dawn VIR Software Interface Specification (SIS) located on this volume
at:
/DOCUMENT/SIS/
Both PDF-A and HTML (with figures supplied as separate image files) are
available.
Users of these data are encouraged to acknowledge both the PDS and the
principal investigators of the instruments whose data are used in analysis
in all publications.
Following the loss of the 2nd reaction wheel during Vesta departure, Dawn had
to rely on the RCS thrusters, rather than reaction wheels, to maintain
pointing. While the Dawn system does not employ true dead-banding, the net
result of the thruster firings is to introduce pointing offsets of up to
+/- 0.64 degrees in +X and +Y, and rates of up to 0.01 degrees/second (or
~ 0.7 VIR pixels/second). The combination of long VIR integration times with
large pointing and pointing rate errors complicates interpreting the data
acquired as normal spectral cubes. When Dawn is near to Ceres, the timing of
the thruster firings is moderately predicable with the most common attitude
near one of the deadband limits. When Dawn is far from its selected target
the thruster firing is more random and the impact of not being pointed at
Ceres nadir is amplified. This is especially apparent in the VIR cubes since
each frame of the cube effectively has its own pointing. During Approach and
RC3, Ceres is highly distored in the raw data cubes and care must taken to
properly correct the geometry when calibrating and interpretting these data.
==============================================================================
Key References
==============================================================================
The Dawn Science Plan [RAYMOND2007] is critical to the understanding of the
Ceres observations and science objectives. A copy of this document is located
in the /DOCUMENT/SCIENCE_PLAN directory of this archive volume.
The VIR instrument description paper [DESANCTISETAL2010], contains important
information regarding the design and fuction of the VIR instrument, including
its calibration and limitations. This document is not not included in the
archive, but may be accessed online:
De Sanctis, M. C., A. Coradini, E. Ammannito, G. Filacchione
M.T. Capria, S. Fonte, G. Magni, A. Barbis, A. Bini, M. Dami,
I. Ficai-Veltroni, and G. Preti, VIR Team, The VIR Spectrometer,
Space Sci Rev, doi:10.1007/s11214-010-9668-5, 2010.
Other critical documentation in the DOCUMENT directory include the volume SIS,
calibration procedure, and a description of the VIR internal calibration lamp.
==============================================================================
Volume Set Information
==============================================================================
This volume is part of the VIR calibrated level-1B RDR data volume set. This
volume set includes the following volumes:
Volume ID Description
--------------------------------------------------------
DWNXVIR_I1B Dawn VIR-IR L1-B RDR cruise data
DWNXVIR_V1B Dawn VIR-VIS L1-B RDR cruise data
DWNVVIR_I1B Dawn VIR-IR L1-B RDR Vesta data
DWNVVIR_V1B Dawn VIR-VIS L1-B RDR Vesta data
DWNCAVIR_I1B Dawn VIR-IR L1-B RDR Ceres Approach data
DWNCAVIR_V1B Dawn VIR-VIS L1-B RDR Ceres Approach data
DWNCSVIR_I1B Dawn VIR-IR L1-B RDR Ceres Survey data
DWNCSVIR_V1B Dawn VIR-VIS L1-B RDR Ceres Survey data
DWNCHVIR_I1B Dawn VIR-IR L1-B RDR Ceres HAMO data
DWNCHVIR_V1B Dawn VIR-VIS L1-B RDR Ceres HAMO data
DWNCLVIR_I1B Dawn VIR-IR L1-B RDR Ceres LAMO data
DWNCLVIR_V1B Dawn VIR-VIS L1-B RDR Ceres LAMO data
DWNC1VIR_I1B Dawn VIR-IR L1-B RDR Ceres Extended Mission Orbit 1 data
DWNC1VIR_V1B Dawn VIR-VIS L1-B RDR Ceres Extended Mission Orbit 1 data
DWNC2VIR_I1B Dawn VIR-IR L1-B RDR Ceres Extended Mission Orbit 2 data
DWNC3VIR_I1B Dawn VIR-IR L1-B RDR Ceres Extended Mission Orbit 3 data
DWNC3VIR_V1B Dawn VIR-VIS L1-B RDR Ceres Extended Mission Orbit 3 data
DWNC4VIR_I1B Dawn VIR-IR L1-B RDR Ceres Extended Mission Orbit 4 data
DWNC4VIR_V1B Dawn VIR-VIS L1-B RDR Ceres Extended Mission Orbit 4 data
==============================================================================
Mission Facts
==============================================================================
The 'Dawn Ceres Science Observations' table below provides a list of
observations made by the Dawn VIR instrument. It includes the observation
start date, the ID of the phase in which it occurred, the activity name, and
a brief description.
This volume contains Ceres Science LAMO VIS calibrated data. The other
calibrated VIR data are contained on the volumes described above.
----------------------------------------------------------------------------
Dawn Science Observations
----------------------------------------------------------------------------
Start Mission Activity Activity
Date Phase Name Description
============================================================================
14-12-26 CSA APPROACH Ceres Science Approach Phase
----------------------------------------------------------------------------
15-01-13 CSA OPNAV_001 Ride-along cubes to FC OpNav images - 4 obs
15-01-25 CSA OPNAV_002 Ride-along cubes to FC OpNav images - 4 obs
15-02-04 CSA OPNAV_003 Ride-along cubes to FC OpNav images - 5 obs
15-02-12 CSA RC1 Ride-along cubes to FC rotational - 10 obs
characterization movie #1 - 8 obs
15-02-19 CSA RC2 Ride-along cubes to FC rotational - 3 obs
characterization movie #2 - 3 obs
15-02-25 CSA OPNAV_004 Ride-along cubes to FC OpNav images - 3 obs
15-03-01 CSA OPNAV_005 Ride-along cubes to FC OpNav images - 3 obs
15-04-10 CSA OPNAV_006 Ride-along cubes to FC OpNav images - 3 obs
15-04-15 CSA OPNAV_007 Ride-along cubes to FC OpNav images - 3 obs
============================================================================
15-04-24 CSR RC3 Ceres Science Rotational Characterization 3
----------------------------------------------------------------------------
15-04-25 CSR RC3 RC3 Equator Limb 1 (S) high phase - 10 obs
15-04-30 CSR RC3 RC3 Equator Limb 2 (N) high phase - 16 obs
15-05-04 CSR RC3n RC3 North lit side - 16 obs
15-05-05 CSR RC3e RC3 Equator lit side - 16 obs
15-05-07 CSR RC3s RC3 South lit side - 16 obs
----------------------------------------------------------------------------
15-05-09 CTS TRANSFER_ Ceres Transfer to Survey Phase
TO_Survey
----------------------------------------------------------------------------
15-05-16 CTS OPNAV_008 Ride-along cubes to FC OpNav images - 7 obs
15-05-22 CTS OPNAV_009 Ride-along cubes to FC OpNav images - 7 obs
----------------------------------------------------------------------------
15-06-04 CSS SURVEY Ceres Science Survey Phase (range ~4850 km)
----------------------------------------------------------------------------
15-06-04 CSS CYCLE1 Survey Cycle (orbit) 1 - 44 obs
15-06-08 CSS CYCLE2 Survey Cycle (orbit) 2 - 49 obs
15-06-11 CSS CYCLE3 Survey Cycle (orbit) 3 - 44 obs
15-06-14 CSS CYCLE4 Data lost to instrument reset, all data lost
15-06-17 CSS CYCLE5 Survey Cycle (orbit) 5 VIS-Only - 51 obs
15-06-21 CSS CYCLE6 Survey Cycle (orbit) 6 VIS bad - 50 obs
15-06-24 CSS CYCLE7 Survey Cycle (orbit) 7 VIS-Only - 49 obs
15-06-27 CSS CYCLE8 Data lost to instrument reset, all data lost
----------------------------------------------------------------------------
15-07-01 CTH TRANSFER_ Ceres Transfer to HAMO Phase
TO_HAMO
----------------------------------------------------------------------------
No science observation in this phase
----------------------------------------------------------------------------
15-08-17 CSH HAMO Ceres Science HAMO Phase (avg rng ~1950 km)
----------------------------------------------------------------------------
15-08-17 CSH CYCLE1 12 orb pushbroom nadir imaging - 62 obs
15-08-29 CSH CYCLE2 12 orb pushbroom off-nadir imaging - 71 obs
15-09-09 CSH CYCLE3 12 orb pushbroom off-nadir IR-only - 108 obs
15-09-20 CSH CYCLE4 12 orb pushbroom off-nadir imaging - 85 obs
15-10-01 CSH CYCLE5 12 orb pushbroom near nadir IR-only - 84 obs
15-10-12 CSH CYCLE6 12 orb pushbroom off-nadir imaging - 73 obs
----------------------------------------------------------------------------
15-10-23 CTL TRANSFER_ Ceres Transfer to LAMO Phase
TO_LAMO
----------------------------------------------------------------------------
No science observation in this phase
----------------------------------------------------------------------------
15-12-16 CSL LAMO Ceres Science LAMO Phase (range ~850 km)
----------------------------------------------------------------------------
15-12-16 CSL CYCLE0 nadir pushbroom imaging IR-only - 2 obs
15-12-18 CSL CYCLE1 nadir pushbroom imaging IR-only - 9 obs
16-01-10 CSL CYCLE2 nadir scan mirror imaging IR-only - 11 obs
16-02-02 CSL CYCLE3 nadir scan mirror imaging IR-only - 15 obs
16-02-25 CSL CYCLE4 nadir scan mirror imaging IR-only - 18 obs
16-03-19 CSL CYCLE5 off-nadir scan mirror imaging IR-only - 34 obs
16-04-11 CSL CYCLE6 off-nadir scan mirror imaging IR-only - 30 obs
16-05-04 CSL CYCLE7 off-nadir scan mirror imaging - 24 obs
16-05-27 CSL CYCLE8 off-nadir scan mirror imaging - 33 obs
----------------------------------------------------------------------------
16-06-19 CXL XMO1 Ceres Extended LAMO Phase (range ~850 km)
----------------------------------------------------------------------------
16-06-19 CXL CYCLE9 off-nadir scan mirror imaging - 40 obs
16-07-18 CXL CYCLE10 off-nadir scan mirror imaging VIS-only - 38 obs
16-08-10 CXL CYCLE11 off-nadir scan mirror imaging - 29 obs
----------------------------------------------------------------------------
16-09-02 CTJ TRANSFER_ Ceres Transfer to Juling Phase
TO_JULING
----------------------------------------------------------------------------
No VIR science observations in this phase
----------------------------------------------------------------------------
16-10-10 CXJ XMO2 Ceres Extended Juling Phase (range ~1950 km)
----------------------------------------------------------------------------
16-10-10 CXJ CYCLE1 off-nadir imaging IR-only - 12 obs
16-10-24 CXJ CYCLE2 off-nadir imaging IR-only - 6 obs
----------------------------------------------------------------------------
16-11-03 CTG TRANSFER_ Ceres Transfer to GRaND Phase
TO_GRAND
------------------------------------------------------------------------------
No VIR science observations in this phase
==============================================================================
File Formats
==============================================================================
The data cube files on this volume are binary. The housekeeping (HK) data
files are ASCII tables. Both the binary cubes and ASCII HK data have detached
PDS labels. The PDS label is an ASCII file containing information describing
spacecraft, target, and observation parameters characterizing the associated
data file.
A data set description, instrument description, and other PDS documents
are in .CAT files in the /CATALOG directory. In more recent versions of the
Microsoft Windows operating system the .CAT by default is reserved as
'Security Catalog.' The .CAT files contained in this volume are ASCII text
files, and can be read by any form of text editor. To make Windows open
files with this name extension as text files right click the .CAT file, select
with and choose a text editor to open the file.
Additional documentation is located in the DOCUMENT directory.
==============================================================================
Errata
==============================================================================
Every effort has been made to assure that the data and documentation are of
the best possible quality. However, mistakes are inevitable. There is a file
called ERRATA.TXT found at the root level of this volume which contains a list
of known deficiencies or caveats associated with data on this volume at the
time this volume was produced.
==============================================================================
Volume Contents and Structure
==============================================================================
This section describes the volume structure and naming conventions. Below is
a tree diagram of the volume, followed by a description of the directory
function and key files in each directory.
DWNCLVIR_V1B (root directory)
|
|- AAREADME.TXT Describes volume contents, and organization (this file)
|
|- ERRATA.TXT Describes known deficiencies or caveats in the data on
| this volume.
|
|- VOLDESC.CAT High level description of volume contents.
|
|- [CATALOG] PDS catalog files containing information describing the
| data, instrument, instrument personnel, relevant references,
| the spacecraft, and mission.
|
|- [DATA] Contains the data. The DATA directory is subdivided into
| separate subdirectories by mission phase, and observation
| period.
|
|- [DOCUMENT] Contains documents important to the understanding and use
| of the data on this archive volume.
|
|- [EXTRAS] Contains files which are not an official part of the
| archive, and which may not conform with PDS standards,
| but which may be of use to data users.
|
|- [GEOMETRY] Contains VIR SPICE metakernel (TM) files, listing the SPICE
| kernels used in generating the data and data label files.
|
|- [INDEX] Contains a list of all data products on this volume and a
a list of geometric parameters associated with each product.
============================================================================
Contacts
============================================================================
This volume was produced for the Planetary Data System (PDS) at the Small
Bodies node. The images, and associated metadata were supplied by Dr.
Angioletta Coradini at the Istituto Nazionale Di Astrofisica (INAF). The
volume was assembled at the Dawn Science Center (DSC), by Joseph N. Mafi.
For questions or problems regarding the volume, please contact Dr. Carol
Neese at the PDS Small Bodies Node:
Email neese@psi.edu
Telephone 520-622-6300
Mail Carol Neese
Planetary Science Institute
1700 E. Ft. Lowell, Ste. 106
Tuscon, AZ 85719-2395
USA
For question regarding the data, please contact Dr. Maria Cristina De Sanctis
at INAF:
Internet mariacristina.desanctis@iaps.inaf.it
Telephone +39 06 499344448
Mail Area di Ricerca di Tor Vergata
via del Fosso del Cavaliere, 100
00133 Rome
Italy
For questions regarding PDS Standards or other archives available from the
PDS, please contact PDS Operator at the PDS Engineering Node (at JPL):
Email pds_operator@jpl.nasa.gov
Telephone 818-354-4321
Mail Planetary Data System, PDS Operator
Jet Propulsion Laboratory
Mail Stop 202-101
4800 Oak Grove Dr.
Pasadena, CA 91109-8099
USA
The PDS assumes no legal liability for errors on this disk. All users are
encouraged to verify the correctness of the data prior to submitting any
publications or other work based on these data. Please report errors on this
disk to the Small Bodies Node of the PDS through the ERRATA reporting
procedures described above.