Mission
Building on lessons learned from previous ocean color studies, a team of dedicated people is bringing PACE to life. PACE will face a series of important milestones during its mission development. The Development Team at Goddard Space Flight Center (GSFC) will guide PACE through each phase as the instruments, spacecraft, and observatory are built, tested, and flown.
PACE will also include two polarimeters. Such instruments are used to measure how the oscillation of sunlight within a geometric plane - known as its polarization - is changed by passing through clouds, aerosols, and the ocean.
The polarimeters onboard the PACE observatory are the Spectro-polarimeter for Planetary Exploration (SPEXone) and the Hyper Angular Research Polarimeter (HARP2). They will be contributed by a consortium based in the Netherlands and University of Maryland Baltimore County, respectively.
Together, SPEXone and HARP2 will meet the PACE mission's needs by providing complementary spectral and angular sampling, polarimetric accuracy, and spatial coverage (see table below). They will provide opportunities for improved OCI atmospheric correction, as well as a comprehensive range of aerosol and cloud science data products beyond what could be accomplished by the OCI alone. Thus, the synergistic payload of the OCI, SPEXone, and HARP2 will be poised to make significant breakthroughs in aerosol-cloud-ocean research.
Observatory
GSFC is responsible for the principal mission elements, including the design and fabrication of the spacecraft, development of scientific instrumentation.| Observatory Overview | |
|---|---|
| Mass with fuel | Not to exceed 1700 kg (3748 lb) |
| Dimensions | 1.5 m x 1.5 m x 3.2 m (4.9 ft x 4.9 ft x 10.5 ft) |
| Power | 1000 Watts |
| Communications | S-Band - Command & Telemetry Ka-Band - Science Data |
Instruments
The primary science instrument planned for PACE is the Ocean Color Instrument (OCI) which will be capable of measuring the color of the ocean from ultraviolet to shortwave infrared. Learn more about the OCI »
PACE will also include two polarimeters. Such instruments are used to measure how the oscillation of sunlight within a geometric plane - known as its polarization - is changed by passing through clouds, aerosols, and the ocean.
The polarimeters onboard the PACE observatory are the Spectro-polarimeter for Planetary Exploration (SPEXone) and the Hyper Angular Research Polarimeter (HARP2). They will be contributed by a consortium based in the Netherlands and University of Maryland Baltimore County, respectively.
Together, SPEXone and HARP2 will meet the PACE mission's needs by providing complementary spectral and angular sampling, polarimetric accuracy, and spatial coverage (see table below). They will provide opportunities for improved OCI atmospheric correction, as well as a comprehensive range of aerosol and cloud science data products beyond what could be accomplished by the OCI alone. Thus, the synergistic payload of the OCI, SPEXone, and HARP2 will be poised to make significant breakthroughs in aerosol-cloud-ocean research.
| SPEXone | HARP2 | |
|---|---|---|
| Attributes | Hyperspectral (UV) & narrow swath | Hyperangular & wide swath |
| Spectral range [resolution] | 385-770 nm in 2-4 nm steps | 440, 550, 670 nm [10 nm] & 870 nm [40 nm] |
| Polarized bands | Same range as above in 15-45 nm steps | All |
| Number of viewing angles [degrees] | 5 [-57°, -20°, 0°, 20°, 57°] | 10 for 440, 550, 870 nm & 60 for 670 nm [spaced over 114°] |
| Coverage [swath width] | ±4° [100 km at nadir] | ±47° [1556 km at nadir] |
| Global coverage | About 30 days | 2 days |
| Ground sample distance | 2.5 km | 3 km |
Mission Architecture
PACE StoryMap
Visualizations of PACE in Orbit
Click image to view movie. Credit: NASA Scientific Visualization Studio.
Click image to view movie. Credit: NASA Scientific Visualization Studio.
Click image to view movie. Credit: NASA Scientific Visualization Studio.
Mission Status
In August 2019, the mission entered Phase C, Final Design & Fabrication, with an expected launch readiness date of 2024.
View the full mission timeline »