Welcome to OPUS3, the 10th anniversary version of OPUS released May, 2019. OPUS3 has a new look-and-feel and new functionality. Please see the FAQ section or our blog for details.

OPUS (Outer Planets Unified Search), a web-based data search tool for NASA outer planet missions, is a project of the Ring-Moon Systems Node of NASA's Planetary Data System (PDS). The PDS is a carefully-curated permanent archive of data from and supporting NASA missions, which are freely available to researchers and the general public. The Ring-Moon Systems Node, one of six Discipline Nodes, specializes in imaging, spectral, and occultation data related to the outer planets, rings, and moons of our solar system. It is hosted at The SETI Institute in Mountain View, California.

OPUS supports user-friendly searching on metadata normally associated with observations, such as the mission, instrument, intended target, observation time, and PDS4 bundle name or PDS3 volume name, as well as metadata specific to each supported mission and instrument.

In addition, OPUS excels at multi-mission and multi-instrument searches by providing search parameters that are more generic in nature; these are computed by the Ring-Moon Systems Node and uniquely available in OPUS. Among these are:

• Ring Geometry, such as radius, longitude, resolution, and phase angle, calculated separately for each observation relative to the ring plane of the appropriate planet.
  For example, this query searches for:
  • Images taken by Cassini's ISS Narrow-Angle Camera
  • of the Keeler Gap in Saturn's rings (136,400-136,600 km)
  • at high resolution (< 2 km per pixel)
  • on the lit side of the rings (emission angle 0-75°)
• Body Surface Geometry, such as longitude, latitude, distance, resolution, and phase angle, calculated separately for each observation for all bodies in the field of view.
  For example, this query searches for:
  • All observations of Pluto
  • at high phase (> 160°)
  • and high resolution (< 5 km per pixel)
• Observation Type, such as "Image", "Spectrum", or "Spectral Time Series".
• Measurement Quantity, such as "Reflectivity" or "Optical Depth".
• Image attributes, such as size in pixels, image type, and exposure duration.
• Wavelength attributes, such as wavelength range and resolution, which permit searching for observations in a particular bandpass across instruments and filters.

OPUS supplies data from the following missions and instruments. In addition to the data supplied by the instrument teams, OPUS provides calibrated images for Cassini ISS and Voyager ISS.

If you use OPUS in your own research, we would appreciate an acknowledgment in your paper, poster, or presentation. You may describe OPUS as "The PDS Ring-Moon Systems Node's OPUS search service". We would also appreciate if you would drop us a note to let us know about it.

Please note that OPUS requires a browser size of at least 600 by 350. We support Firefox (64+), Chrome (56+), Safari (10.1+), and Opera (42+).

Updates are announced on our blog, Mastodon, BlueSky, and the opus-users mailing list.

We actively solicit questions, comments, and feedback and look forward to hearing from you.

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