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Global Navigation Satellite System (GNSS) Final Combined Station Positions/Velocities Product from NASA CDDIS

This derived product set consists of Global Navigation Satellite System Final Combined Station Positions/Velocities Product available from the Crustal Dynamics Data Information System (CDDIS). GNSS provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at the CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Since 2011, the CDDIS GNSS archive includes data from other GNSS (Europe’s Galileo, China’s Beidou, Japan’s Quasi-Zenith Satellite System/QZSS, the Indian Regional Navigation Satellite System/IRNSS, and worldwide Satellite Based Augmentation Systems/SBASs), which are similar to the U.S. GPS in terms of the satellite constellation, orbits, and signal structure. Analysis Centers (ACs) of the International GNSS Service (IGS) retrieve GNSS data on regular schedules to produce precise orbits identifying the position and velocity of the GNSS satellites as well as precise station positions and velocities for the network of GNSS receivers. The IGS Reference Frame Coordinator uses these individual AC solutions to generate the official IGS station position/velocity product. The final products are considered the most consistent and highest quality IGS solutions and consists of daily and weekly station position and velocity files in SINEX format, generated on a daily/weekly basis by combining solutions from individual IGS ACs, approximately 11-17 days after the end of the solution week.

Positions and Proper Motions Catalog

The PPM database is the Catalog of Positions and Proper Motions. It combines the two catalogs for PPM North and PPM South, the Bright Stars Supplement to PPM, and the 90,000 Stars Supplement to the PPM. The PPM North list gives positions and proper motions of 181731 stars north of -2.5 degrees declination. PPM South gives positions and proper motions of 197179 stars south of about -2.5 degrees declination. The star density of PPM South is slightly higher than that of its northern counterpart and the accuracy of the present-epoch positions is roughly twice that in the north. A number of bright stars are missing from the PPM and PPM South Star Catalogs. The Bright Stars Supplement included here makes the PPM catalogs complete down to V=7.5 mag. For this purpose it adds all missing stars brighter than V=7.6 mag that could be found in published star lists. Their total number is 321. Only 5 of them are brighter than V=3.5 Since its appearance in 1966, the SAO Catalogue has been the primary source for stellar positions and proper motions. Typical values for the rms errors are 1 arcsec in the positions at epoch 1990, and 1.5 arcsec/century in the proper motions. The corresponding figures for the AGK3 Catalog in the northern hemisphere are 0.45 arcsec and 0.9 arcsec/century. Common to both of these catalogues is the fact that proper motions are derived from two observational epochs only, and that positions are nominally in the B1950/FK4 coordinate system. The PPM Star Catalogue (Roeser and Bastian, 1991, Bastian et al., 1993; for a short description see Roeser and Bastian, 1993) effectively replaced these catalogues by providing more precise astrometric data for more stars on the J2000/FK5 coordinate system. Compared to the SAO Catalogue the improvement in precision is about a factor of 3 on the northern and a factor of 6 to 10 on the southern hemisphere. In addition, the number of stars is increased by about 50 percent. Typical values for the rms errors on the northern hemisphere are 0.27 arcsec in the positions at epoch 1990, and 0.42 arcsec/century in the proper motions. On the southern hemisphere PPM is much better, the corresponding figures being 0.11 arcsec and 0.30 arcsec/century. The improvement over the SAO Catalogue was made possible by the advent of new big catalogues of position measurements and by the inclusion of the century-old Astrographic Catalogue (AC) into the derivation of proper motions. The AC contains roughly four million stars that are not included in PPM. For most of them no precise modern-epoch position measurements exist. Thus it is not yet possible to derive proper motions with PPM quality for all AC stars. But among the 4 million there is a subset of some 100,000 CPC-2 stars that are not included in PPM. These stars constitute the 90,000 Stars Supplement to PPM, and can be identified from their PPM Number having a value between 700001 and 789676. This database was updated by the HEASARC in October 1999 based on ADC/CDS catalogs I/146 (PPM - North), I/193 (PPM - South), I/206 (Bright Stars Supplement to PPM), and I/208 (90,000 Stars Supplement to PPM). This is a service provided by NASA HEASARC .

SAGE IRAC Offset Position Archive

The Spitzer Space Telescope Survey of the Large Magellanic Cloud Legacy Project Surveying the Agents of a Galaxy's Evolution (SAGE) traces the life cycle of observable matter that drives the evolution of a galaxy's appearance. SAGE has revealed over 6 million sources including ~150,000 evolved stars, ~50,000 young stellar objects and the diffuse interstellar medium with column densities > 1.2×1021 cm -2. The data will provide fundamental insights into the physical processes of the interstellar medium, the formation of new stars and the injection of mass by evolved stars and their relationships on the galaxy-wide scale of the Large Magellanic Cloud.In comparison to the catalog, the archive has more source fluxes (fewer nulled wavelengths) and some more sources but these additions have more uncertainty associated with them. For the catalog, the S/N must be greater than [6, 6, 6, 10] for IRAC bands [3.6um], [4.5um], [5.8um] and [8.0um] for the flux to appear in the corresponding wavelength column. Whereas for the archive, the S/N must be greater than [5, 5, 5, 5] for IRAC bands [3.6um], [4.5um], [5.8um] and [8.0um]. For the catalog, sources with neighbors within a 2" radius are excluded (culled). For the archive, sources within a 0.5" radius are excluded. The difference in criteria for the catalog and archive creation is more complex and described in Section 5.2 of the SAGE Data Delivery Document.The offset position is a calibration field at RA=82.25d Dec=-45.95d.

SAGE IRAC Offset Position Catalog

Polar Definitive Orbit, 1 min Data, Spacecraft Position and Velocity in GCI, GSE, GSM, and HEC Coordinates

Polar Definitive Orbit, Spacecraft Position and Velocity in Geocentric Celestial Inertial, GCI, Geocentric Solar Ecliptic, GSE, Geocentric Solar Magnetospheric, GSE, Heliospheric Ecliptic, HEC, Coordinates

Wind Magnetic Fields Instrument (MFI) Magnetic Field Vector and Spacecraft Position, Key Parameter (K0), 92 s Data

Wind Magnetic Fields Investigation, MFI, Key Parameter magnetic field data in GSE and GSM coordinates.References:* 1. Panetta P, GSFC, GGS Wind MFI Operators Manual, September 15, 1992.* 2. Computer Sciences Corporation, Data Format Control Document, DFCD, between the International Solar-Terrestrial Physics, ISTP, program information investigators, CSC/TR-91/6014, 560-1DFD/0190, July 1992.* 3. Behannon, K.W., International Solar Terrestrial Physics, ISTP, program investigator data analysis requirements for Wind and Geotail spacecraft magnetometer experiment, September 1987.

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PVO VENUS SC POSITION DERIVED VSO COORDS 12 SECOND VER1.0

This dataset contains Pioneer Venus Orbiter (PVO) spacecraft position and orientation data in Venus Solar Orbital (VSO) coordinates. This dataset is sampled every 12 seconds near periapsis, and at 1 minute or 10 minute rates in the solar wind, the lowest rates near apoapsis. Planetocentric and heliocentric position vectors and solar zenith angle (Sun-Venus-PVO) are also provided. The VSO parameters are derived from the PVO Supplemental Experimenter Data Records (SEDR), other parameters are taken directly from the SEDR dataset.

CDDIS_GNSS_products_positions

Weekly station positions and velocity solutions in Software INdependent EXchange (SINEX) format derived from analysis of Global Navigation Satellite System (GNSS) data. These products are the generated by analysis centers in support of the International GNSS Service (IGS) and combined by the IGS reference frame coordinator to form the official IGS station position product (weekly).

VOYAGER 2 JUPITER POSITION RESAMPLED DATA 48.0 SECONDS

This data set includes Voyager 2 Jupiter encounter position data that have been generated at a 48.0 second sample rate using the NAIF SPICE kernals. The data set is composed of 4 columns: 1) ctime - this column contains the data acquisition time. The time is always output in the ISO standard spacecraft event time format (yyyy-mm-dd-Thh:mm:ss.sss) but is stored internally in Cline time which is measured in seconds after 00:00:00.000 Jan 01, 1966, 2) r - this column contains the radial distance from Jupiter in Rj = 71398 km, 3) longitude - this column contains the east longitude of the spacecraft in degrees, 4) latitude - this column contains the latitude of the spacecraft in degrees. Position data is given in Minus System III coordinates.

MEaSUREs Annual Greenland Outlet Glacier Terminus Positions from SAR Mosaics V002

This data set, part of the NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) program, consists of annual, digitized (polyline) ice front positions for 239 outlet glaciers in Greenland. Ice front positions are derived from Sentinel-1A, Sentinel-1B, and RADARSAT-1 synthetic aperture radar (SAR) mosaics, plus imagery from Landsat 1 through Landsat 5 and Landsat 7 and Landsat 8. Although temporal coverage varies by glacier, data are available for the winter seasons 1972–1973 through 2020–2021. Data are provided as shapefiles. See <a href="http://nsidc.org/data/measures/gimp">Greenland Ice Mapping Project (GrIMP)</a> for related data.

VOYAGER 2 DAILY POSITION V1.0

This dataset contains Voyager 2 trajecotyr data from the interplanetary cruise sampled daily in Solar Ecliptic and Heliographic coordinates.

MEaSUREs Weekly to Monthly Greenland Outlet Glacier Terminus Positions from Sentinel-1 Mosaics V001

This data set consists of sub-seasonal, digitized (polyline) ice front positions for 219 outlet glaciers in Greenland. For 199 glaciers, ice front positions are digitized at a monthly resolution. For 20 glaciers in northwestern Greenland, ice front positions are digitized at a 6-12 day resolution, depending on the availability of satellite imagery. Ice front positions are derived from Sentinel-1A and Sentinel-1B synthetic aperture radar (SAR) mosaics.

Wind Definitive Orbit, 10 min Data, Spacecraft Position and Velocity in GCI, GSE, GSM, HEC, and HG Coordinates

Wind Definitive Orbit, Spacecraft Position and Velocity in Geocentric Celestial Inertial, GCI, Geocentric Solar Ecliptic, GSE, Geocentric Solar Magnetospheric, GSM, Heliospheric Ecliptic, HEC, and Heliographic, HG, Coordinates

CDDIS_DORIS_products_positions

Station position and velocity solutions (weekly and cumulative) in Software INdependent EXchange (SINEX) format derived from analysis of Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) data. The solutions include daily values of Earth Orientation Parameters (EOPs). These products are the generated by analysis centers in support of the International DORIS Service (IDS). Time series of station coordinate solutions in Station Coordinate Difference (STCD) are also generated by the IDS analysis centers. Weekly solutions represent the IDS contribution to the International Terrestrial Reference Frame (ITRF) determination.

HerMES Band-merged Catalog (24 micron positions)

The Herschel Multi-tiered Extragalactic Survey (HerMES) is a legacy programme (KPGT_soliver1) designed to map a set of nested fields totalling 380 sq. deg. Fields range in size from 0.01 to 20 sq. deg., using SPIRE at 250, 350 and 500 microns. These bands cover the peak of the redshifted thermal spectral energy distribution from interstellar dust and thus capture the reprocessed optical and ultraviolet radiation from star formation that has been absorbed by dust, and are critical for forming a complete multiwavelength understanding of galaxy formation and evolution.

HerMES Band-merged Catalog (250 micron positions)

VOYAGER 2 SATURN POSITION RESAMPLED DATA 48.0 SECONDS

This data set includes Voyager 2 Saturn encounter position data that have been generated at a 48.0 second sample rate using the NAIF SPICE kernals. The data set is composed of 4 columns: 1) ctime - this column contains the data acquisition time. The time is always output in the ISO standard spacecraft event time format (yyyy-mm-dd-Thh:mm:ss.sss) but is stored internally in Cline time which is measured in seconds after 00:00:00.000 Jan 01, 1966, 2) r - this column contains the radial distance from Saturn in Rs = 60330 km, 3) longitude - this column contains the east longitude of the spacecraft in degrees, 4) latitude - this column contains the latitude of the spacecraft in degrees. Position data is given in Minus Saturn Longitude System (kronographic) coordinates.

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GALILEO CRUISE POSITION DATA (RTN COORDINATES)

This dataset contains the Galileo spacecraft trajectory during the interplanetary cruise. The data have been derived from SPICE kernels at a 1 minute sample rate. The data are provided in RTN coordinates.

VOYAGER 1 JUPITER POSITION RESAMPLED DATA 48.0 SECONDS

This data set includes Voyager 1 Jupiter encounter position data that have been generated at a 48.0 second sample rate using the NAIF SPICE kernals. The data set is composed of 4 columns: 1) ctime - this column contains the data acquisition time. The time is always output in the ISO standard spacecraft event time format (yyyy-mm-dd-Thh:mm:ss.sss) but is stored internally in Cline time which is measured in seconds after 00:00:00.000 Jan 01, 1966, 2) r - this column contains the radial distance from Jupiter in Rj = 71398 km, 3) longitude - this column contains the east longitude of the spacecraft in degrees, 4) latitude - this column contains the latitude of the spacecraft in degrees. Position data is given in Minus System III coordinates.

MPF LANDER MARS IMP STEREO-DERIVED 3D POSITIONS V1.0

Three-dimensional position information for pixels in IMP (Imager for Mars Pathfinder) stereo-pair images.