Outer Planets Assessment Group (OPAG)
OPAG Committee
OPAG Updates
OPAG Indication of Interest
OPAG Reports
OPAG Reports
OPAG Internal Link
Outer Planets Discussion Documents
Outer Planets Resources
Student Opportunities
OPAG Calendar
Decadal Survey Documents
Europa Jupiter System Mission


Scientific Goals and Pathways for Exploration of the Outer Solar System
Scientific Goals and Pathways
for Exploration of the
Outer Solar System

Solar System Roadmap
Solar System
Exploration Roadmap



Outer Planets Assessment Group

The Outer Planets Assessment Group was established by NASA in late 2004 to identify scientific priorities and pathways for exploration in the outer solar system. The group consists of a 15-person steering committee, which actively solicits input from the scientific community and reports its findings to NASA Headquarters. OPAG provides input to NASA but does not make recommendations.

OPAG Charter

OPAG is NASA's community-based forum designed to provide science input for planning and prioritizing outer planet exploration activities for the next several decades. It is chartered by NASA's Solar System Exploration Division and reports its findings at meetings of the Solar System Exploration Sub-Committee of the NASA Space Science Advisory Committee. Open to all interested scientists, OPAG regularly evaluates outer solar system exploration goals, objectives, investigations and required measurements on the basis of the widest possible community outreach.

Upcoming Meetings

February 19–20, 2015
NASA Ames Research Center
Mountain View, California

One day prior to the OPAG meeting a Workshop on the Potential for Finding Life in a Europa Plume will take place at NASA Ames Research Center.  Please go to this website for more details. 

Note: Since this workshop and the OPAG meeting will be at a NASA center there will be extra requirements for foreign nationals to attend. These additional requirements are described in detail at the links above. The deadline for foreign nationals to register for the OPAG meeting is January 23.

Residents of Alaska, American Samoa, Arizona, Louisiana, Maine, Massachusetts, Minnesota, New York, Oklahoma, and Washington should plan to bring their passports or Enhanced Drivers License or other acceptable form of ID.  A simple driver's license is not adequate. Details are available when you go to the registration website.

November 13, 2014
OPAG Townhall at DPS
Noon to 1:30 p.m.
JW Marriott, Tucson Ballroom G

Recent Meetings

July 23–24, 2014
Bethesda, MD

January 13–14, 2014
Tucson, Arizona

Outer solar system exploration motivation


Opag Science Goals Document 2014

Draft for Community Comment

Scientific Goals for Exploration of the Outer Solar System


Europa Studies

Europa Special Event

2013 Europa Clipper Update
Robert Pappalardo, Jet Propulsion Laboratory, California Institute of Technology
Brain Cooke, Applied Physics Laboratory, Johns Hopkins University

"Science Potential from a Europa Lander" in Astrobiology
Read the definitive, peer-reviewed version of the Science Definition Team's report on "Science Potential from a Europa Lander" in the journal Astrobiology.

Older Europa Mission Studies

Indication of Interest

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