Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2015

Archinal, B. A.; Acton, C. H.; A’Hearn, Michael F.; Conrad, Albert; Consolmagno, G. J.; Duxbury, T. C.; Hestroffer, Daniel; Hilton, James L.; Kirk, Randolph L.; Klioner, Sergei A.; McCarthy, D.; Meech, К. J.; Oberst, J.; Ping, Jing; Seidelmann, P. K.; Tholen, David J.; Thomas, P. C.; Williams, I. P.

doi:10.1007/s10569-017-9805-5

Cited by 230 publications

(240 citation statements)

References 74 publications

Supporting

Mentioning

225

Contrasting

Unclassified

Order By: Relevance

“…Although the same control network was used, this effort was carried out independently from the bundle adjustment described above (i.e., the mosaics were not produced using any of the updated body parameters except the improved value for W o discussed above). The resulting global shape parameters for Enceladus are given in Table with a comparison to current IAU Working Group on Cartographic Coordinates and Rotational Elements (Archinal et al, ) recommended values, the latter of which were originally derived by Thomas et al (). We find an a , b , and c radius for Enceladus of 256.1, 251.3, and 248.4 km, respectively, where a is the tidal axis and c is the rotation axis.…”

Section: Resulting Productsmentioning

confidence: 99%

“… Note . IAU values are from the IAU Working Group on Cartographic Coordinates and Rotational Elements (Archinal et al, ). This value of W o (indicated with a *) was derived directly from the jigsaw bundle adjustment solution and is independent from our analysis of the position of Salih, which determined the prime meridian offset to be 7.089°.…”

Section: Resulting Productsmentioning

confidence: 99%

“…The first step in our photometric normalization is to apply a modified Minnaert photometric model (Minnaert, 1941) to correct all images to a common viewing geometry: an incidence angle of 30°, an emission angle of 0°, and a phase angle of 30°. The model, which includes a modified empirical phase function, has the form (Takir et al, 2015) (Archinal et al, 2018). This value of W o (indicated with a *) was derived directly from the jigsaw bundle adjustment solution and is independent from our analysis of the position of Salih, which determined the prime meridian offset to be 7.089°.…”

Section: Photometric Corrections and Albedo Mapmentioning

confidence: 99%

See 2 more Smart Citations

A New Enceladus Global Control Network, Image Mosaic, and Updated Pointing Kernels From Cassini's 13‐Year Mission

Bland

Becker

Edmundson

et al. 2018

Earth and Space Science

Self Cite

View full text Add to dashboard Cite

NASA's Cassini spacecraft spent 13 years exploring the Saturn system, including 23 targeted flybys of the small, geologically active moon Enceladus. These flybys provided a wealth of image data from Cassini's Imaging Science Subsystem. To improve the usability of the Enceladus data set, we created a new, global photogrammetric control network for Enceladus that enabled compilation of a versatile cartographic package to support geologic mapping and other investigations. The network used 586 images in four image filters with a pixel scale generally between 50 and 500 m per pixel and a phase angle less than 120° and consisted of 10,362 tie points and 173,704 individual image measures, averaging nearly 17 measures per tie point. Least squares bundle adjustment resulted in a root‐mean‐square residual of 0.45 pixel, corresponding to root‐mean‐square ground point uncertainties of 66, 51, and 46 m in latitude, longitude, and radius, respectively. Using our geodetic control network, we created new global image mosaics, coregistered flyby mosaics to support geologic mapping, and updated pointing kernels for every image used in the solution. These products, including the updated pointing kernels, are available to the community through NASA's Planetary Data System Imaging Annex. The bundle adjustment solution also yielded independently determined shape information, resulting in radii within the stated uncertainty of International Astronomical Union values. The challenges of the data set, and the technical methodology described here are applicable to bodies imaged during multiple flybys with variable viewing and illumination geometry, including other midsized satellites of Saturn, and the Europa Clipper mission.

show abstract

Section: Resulting Productsmentioning

confidence: 99%

Section: Resulting Productsmentioning

confidence: 99%

Section: Photometric Corrections and Albedo Mapmentioning

confidence: 99%

See 1 more Smart Citation

A New Enceladus Global Control Network, Image Mosaic, and Updated Pointing Kernels From Cassini's 13‐Year Mission

Bland

Becker

Edmundson

et al. 2018

Earth and Space Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…4 by the letters A-G. Table 2 summarizes the coordinates, estimated size, and proposed names or designations for the identified topographic features. The reference zero longitude of the asteroid-centric coordinate system was defined as the location of the large equatorial depression Xanthos, following the IAU recommendation for the reference frame (Archinal et al 2018). For each epoch we also indicate whether the feature falls within the visible part of the asteroid and whether it could be identified on the series of images that corresponds to that epoch.…”

Section: Impact Cratersmentioning

confidence: 99%

The shape of (7) Iris as evidence of an ancient large impact?

Hanuš

Marsset

Vernazza

et al. 2019

A&A

View full text Add to dashboard Cite

Context. Asteroid (7) Iris is an ideal target for disk-resolved imaging owing to its brightness (V∼7-8) and large angular size of 0.33 during its apparitions. Iris is believed to belong to the category of large unfragmented asteroids that avoided internal differentiation, implying that its current shape and topography may record the first few 100 Myr of the solar system's collisional evolution. Aims. We recovered information about the shape and surface topography of Iris from disk-resolved VLT/SPHERE/ZIMPOL images acquired in the frame of our ESO large program. Methods. We used the All-Data Asteroid Modeling (ADAM) shape reconstruction algorithm to model the 3D shape of Iris, using optical disk-integrated data and disk-resolved images from SPHERE and earlier AO systems as inputs. We analyzed the SPHERE images and our model to infer the asteroid's global shape and the morphology of its main craters. Results. We present the 3D shape, volume-equivalent diameter D eq =214±5 km, and bulk density ρ=2.7±0.3 g · cm −3 of Iris. Its shape appears to be consistent with that of an oblate spheroid with a large equatorial excavation. We identified eight putative surface features 20-40 km in diameter detected at several epochs, which we interpret as impact craters, and several additional crater candidates. Craters on Iris have depth-to-diameter ratios that are similar to those of analogous 10 km craters on Vesta. Conclusions. The bulk density of Iris is consistent with that of its meteoritic analog based on spectroscopic observations, namely LL ordinary chondrites. Considering the absence of a collisional family related to Iris and the number of large craters on its surface, we suggest that its equatorial depression may be the remnant of an ancient (at least 3 Gyr) impact. Iris's shape further opens the possibility that large planetesimals formed as almost perfect oblate spheroids. Finally, we attribute the difference in crater morphology between Iris and Vesta to their different surface gravities, and the absence of a substantial impact-induced regolith on Iris.

show abstract

“…We suggest that the OGC standards are also largely applicable to planetary needs and that the planetary community should continue to engage the OGC and use, to the greatest extent possible, terrestrial standards (Hare et al, ). Finally, IAU planetary coordinate standards (Archinal et al, ) should be utilized to ensure spatial interoperability. We note that many standards by fiat exist for the definition of coordinate systems and simply suggest that the IAU recommendations (which generally follow historical precedence) be followed.…”

Section: Case Study: a Europa Sdimentioning

confidence: 99%

Framework for the Development of Planetary Spatial Data Infrastructures: A Europa Case Study

Laura

Bland

Fergason

et al. 2018

Earth and Space Science

Self Cite

View full text Add to dashboard Cite

This study presents an implementation framework for the development of planetary spatial data infrastructures (PSDIs) that support improved spatial data management, discovery, access, and utilization. The implementation framework is drawn from terrestrially developed theoretical models (e.g., product‐based, process‐based, and complex adaptive system approaches) and case studies from large‐scale, multiorganization, or transnational spatial data infrastructures. We adapt these terrestrially proven techniques for the planetary sciences and present a Europa case study. This case study includes a knowledge inventory of available foundational and framework data products, the availability and access mechanisms currently used to discover said products, the interoperability of said products in geographic information systems, a review of the policies and standards currently being used by the Europa science community, and discussion of the users a Europa PSDI would serve. This study concludes with a vision for a unified, cross‐organization Europa PSDI to support both current science investigations and future data collection efforts.

show abstract

Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2015

Cited by 230 publications

References 74 publications

A New Enceladus Global Control Network, Image Mosaic, and Updated Pointing Kernels From Cassini's 13‐Year Mission

A New Enceladus Global Control Network, Image Mosaic, and Updated Pointing Kernels From Cassini's 13‐Year Mission

The shape of (7) Iris as evidence of an ancient large impact?

Framework for the Development of Planetary Spatial Data Infrastructures: A Europa Case Study

Contact Info

Product

Resources

About