Data Set Information
|
| DATA_SET_NAME |
VG2 NEP TRAJECTORY DERIVED SUMM NLS COORDS 12SEC V1.0
|
| DATA_SET_ID |
VG2-N-POS-5-SUMM-NLSCOORDS-12SEC-V1.0
|
| NSSDC_DATA_SET_ID |
|
| DATA_SET_TERSE_DESCRIPTION |
Voyager 2 12 second ion density, temperature, and velocity data
from the Voyager 2 Neptune West Longitude System during
the Neptune encounter from 1989-08-24 to 1989-08-26.
|
| DATA_SET_DESCRIPTION |
Data Set Overview
=================
This dataset contains Voyager 2 spacecraft position vectors relative
to Neptune in minus NLS coordinates. The NLS or Neptune West Longitude
System coordinate system is a planetocentric system fixed to Neptune
which is rotating with a 16.11 hour period.
The NLS coordinate system is defined as follows:
- X lies in the equatorial plane of Neptune, positive away from the
planet, and through the prime meridian.
- Z is parallel to the Neptune spin axis, and,
- Y is X x Z (lefthanded)
The prime meridian of the this system is defined such that at
1989-08-25T03:56:00.000 the Voyager 2 spacecraft was at 167.7
degrees west longitude.
For the PDS archive dataset, the original data archive has been
converted to an east longitude (righthanded) coordinate
system minus NLS (-NLS). This is achieved by reversing the direction
of the Y-axis or in spherical coordinates, subtracting the
NLS longitude from 360.0 degrees. The data are provided in units
of Neptune radii which was taken to be 24,765km by the Voyager
project. Angles are given in degrees. Both cartesian and spherical
coordinates are provided.
Parameters
==========
Sampling parameter name : time
Sampling parameter resolution : 12.0 seconds
Minimum sampling parameter : n/a
Maximum sampling parameter : n/a
Sampling parameter interval : 12.0 seconds
Minimum available sampling interval : 12.0 seconds
Data set parameter name : position vector
Noise level : n/a
Data set parameter unit : Neptune radii (24,765km)
or degrees
Coordinates
===========
Neptune West Longitude System (NLS) Coordinates
-----------------------------------------------
Coordinate System Center Name = NEPTUNE
Coordinate system Ref Epoch = UNK /* 1989-08-25:03:56:00.000 */
The orientation of Neptune's pole is specified by a
right ascension of 298.90 and declination of 42.84 at the time
of the encounter, as given in the Jet Propulsion Laboratory's
distribution of physical constants
dated 11/06/89. Planetary longitudes are based on a
16.11 hour rotation period (Warwick et al., 1989) adopted
by the Voyager Project shortly after the encounter.
The zero longitude is defined by the requirement that the West
Longitude of the spacecraft at 0356 SCET
day 237 (near closest approach) be 167.7 NLS;
West Longitudes of the Neptune Longitude System (NLS)
are simply related to the angle PHI:
WLONG = 360. - PHI (degrees)
This definition of the zero longitude was adopted by the
Voyager Project Steering Group in order to minimize
differences in longitudes resulting from changes in the
assumed rotation period.
Position is given in terms of the following:
RANGE (R) - Range from the planet center to the
spacecraft in units of Rn where
Rn = 24,765km.
LATITUDE (LAT) - Spacecraft latitude in degrees. Valid
range -90.0 -> +90.0.
LONGITUDE (W_LONG) - West longitude where the zero longitude is
defined by the requirement that the West
Longitude of Voyager 2 at
1989-08-25T03:56:00.00 was 167.7 degrees.
|
| DATA_SET_RELEASE_DATE |
1992-11-01T00:00:00.000Z
|
| START_TIME |
1989-08-24T06:00:00.000Z
|
| STOP_TIME |
1989-08-26T08:19:48.000Z
|
| MISSION_NAME |
VOYAGER
|
| MISSION_START_DATE |
1972-07-01T12:00:00.000Z
|
| MISSION_STOP_DATE |
N/A (ongoing)
|
| TARGET_NAME |
NEPTUNE
|
| TARGET_TYPE |
PLANET
|
| INSTRUMENT_HOST_ID |
VG2
|
| INSTRUMENT_NAME |
N/A
|
| INSTRUMENT_ID |
POS
|
| INSTRUMENT_TYPE |
N/A
|
| NODE_NAME |
Planetary Plasma Interactions
|
| ARCHIVE_STATUS |
ARCHIVED
|
| CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview
=========================
There is no dataset confidence information archived with this dataset.
The data provider has included a flag value which is included in the
mag dataset which may reduce confidence in individual vectors due to
telemetry or software errors.
Data Quality and Coverage
=========================
Table 1 contains hourly summaries of the percentage of the data
available, data quality, and contamination codes. Tables 2 and 3
contain descriptions of the data quality and data contamination
ID's respectively.
-------------------------------------------------------------------
Table 1. Hourly Data Coverage and Quality Summaries
-------------------------------------------------------------------
Start Time Mode Percent Qual Contam NumGood
-------------------------------------------------------------------
1989-08-24T19:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-24T20:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-24T21:00:00 ENCOUNTER 95.667 -1 -1 1435
1989-08-24T22:00:00 ENCOUNTER 97.333 -1 -1 1460
1989-08-24T23:00:00 ENCOUNTER 94.333 -1 -1 1415
1989-08-25T00:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-25T01:00:00 ENCOUNTER 93.667 -1 -1 1405
1989-08-25T02:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-25T03:00:00 ENCOUNTER 84.667 -1 -1 1270
1989-08-25T04:00:00 ENCOUNTER 96.667 -1 -1 1450
1989-08-25T05:00:00 ENCOUNTER 94.667 -1 -1 1420
1989-08-25T06:00:00 ENCOUNTER 99.000 -1 -1 1485
1989-08-25T07:00:00 ENCOUNTER 98.333 -1 -1 1475
1989-08-25T08:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-25T09:00:00 ENCOUNTER 98.667 -1 -1 1480
1989-08-25T10:00:12 ENCOUNTER 99.667 -1 -1 1495
1989-08-25T11:00:00 ENCOUNTER 94.667 -1 -1 1420
1989-08-25T12:00:00 ENCOUNTER 98.000 -1 -1 1470
1989-08-25T13:00:00 ENCOUNTER 97.667 -1 -1 1465
1989-08-25T14:00:00 ENCOUNTER 98.667 -1 -1 1480
1989-08-25T15:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-25T16:00:00 ENCOUNTER 98.000 -1 -1 1470
1989-08-25T17:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-25T18:00:00 ENCOUNTER 98.000 -1 -1 1470
1989-08-25T19:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-25T20:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-25T21:00:00 ENCOUNTER 98.333 -1 -1 1475
1989-08-25T22:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-25T23:00:00 ENCOUNTER 96.000 -1 -1 1440
1989-08-26T00:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-26T01:00:00 ENCOUNTER 98.333 -1 -1 1475
1989-08-26T02:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-26T03:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-26T04:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-26T05:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-26T06:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-26T07:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-26T08:00:00 ENCOUNTER 100.000 -1 -1 1500
1989-08-26T08:19:48 ENCOUNTER 33.333 -1 -1 500
--------------------------------------------------------------------
Table 2. Data Quality ID Descriptions
--------------------------------------------------------------------
ID Description
--------------------------------------------------------------------
-1 no attempt has been made to specify a data quality for this
time range
--------------------------------------------------------------------
Table 3. Data Contamination ID Descriptions
--------------------------------------------------------------------
ID Description
--------------------------------------------------------------------
-1 no evaluation of possible contamination has been made
|
| CITATION_DESCRIPTION |
Connerney, J.E.P., VG2-N-POS-5-SUMM-NLSCOORDS-12SEC-V1.0,
VG2 NEP TRAJECTORY DERIVED SUMM NLS COORDS 12SEC V1.0,
NASA Planetary Data System, 1992.
|
| ABSTRACT_TEXT |
This dataset contains Voyager 2 spacecraft position vectors relative
to Neptune in minus NLS coordinates. The NLS or Neptune West Longitude
System coordinate system is a planetocentric system fixed to Neptune
which is rotating with a 16.11 hour period.
|
| PRODUCER_FULL_NAME |
DR. JOHN E. P. CONNERNEY
|
| SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
|
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