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| Venus Radar Mapper | |
|---|---|
| Name | Venus Radar Mapper |
| Mission type | Planetary reconnaissance |
| Operator | National Aeronautics and Space Administration (NASA) |
| Manufacturer | Jet Propulsion Laboratory (JPL) / industrial partners |
| Launch mass | ~2,500 kg |
| Launch vehicle | Atlas V |
| Launch site | Cape Canaveral Space Force Station |
| Launch date | 2028 (planned) |
| Orbit type | Polar, low Venusian orbit |
| Instruments | Synthetic aperture radar, radiometer, altimeter, spectrometer |
| Programme | Venus Exploration Program |
Venus Radar Mapper The Venus Radar Mapper is a proposed NASA-led planetary reconnaissance mission designed to map the surface and subsurface of Venus with high-resolution synthetic aperture radar, refine models of Venusian geology, and address outstanding questions in planetary evolution. The project brings together teams at the Jet Propulsion Laboratory, Aerospace Corporation, and multiple university research centers to integrate radar, altimetry, and atmospheric sounding into a coordinated orbital campaign. The mission builds on heritage from Magellan (spacecraft), Venus Express, and Akatsuki, while leveraging advances from Cassini–Huygens and Mars Reconnaissance Orbiter radar technologies.
The Venus Radar Mapper is conceived as a polar orbiter carrying a multi-frequency synthetic aperture radar suite, a nadir-pointing altimeter, and passive microwave radiometers to penetrate Venus's dense cloud layers and provide global and regional mapping. The instrument complement enables tie-ins to datasets from Magellan (spacecraft), which provided the first near-global radar maps, and to atmospheric datasets from Pioneer Venus and Venera missions. The mission architecture reflects lessons from Galileo (spacecraft) and Mars Global Surveyor in balancing spacecraft mass, power budgets, and thermal control in harsh environments near Venus.
Primary objectives include producing a global radar map with meter-to-decameter-scale resolution to characterize tectonic features, volcanic constructs, and impact craters; probing subsurface layering to assess volcanic and sedimentary processes; and measuring temporal surface change to test hypotheses about active volcanism. Secondary objectives include coupling surface observations with atmospheric dynamics measured by radiometers to understand volatile exchange and near-surface weathering processes informed by data from Venus Express and laboratory studies at Jet Propulsion Laboratory. The objectives directly address questions raised in the Decadal Survey and feed into comparative planetology studies involving Earth, Mars, and Io.
The spacecraft bus is based on heritage platforms developed by Jet Propulsion Laboratory with contributions from industry partners such as Ball Aerospace and Lockheed Martin Space. The synthetic aperture radar uses multiple bands (X- and S-band) with polarimetric capabilities derived from lessons learned on RADAR systems flown on Cassini–Huygens and Shuttle Radar Topography Mission. Ancillary instruments include a laser or radar altimeter for vertical profiling, a passive microwave radiometer for atmospheric opacity measurements, and a shortwave spectrometer for thermal anomalies. Spacecraft thermal control is informed by studies from Pioneer Venus and materials testing at NASA Ames Research Center. The payload electronics and mission avionics follow standards from Deep Space Network compatible designs and heritage flight software from Mars Reconnaissance Orbiter.
The mission employs a Venus insertion trajectory with gravity assists potentially from Earth or Venus flybys to optimize mass fraction and fuel use, integrating navigation strategies used by MESSENGER and BepiColombo. Operational phases include an initial mapping campaign to obtain global coverage, targeted high-resolution passes of volcanic provinces and tessera highlands, and repeat-pass interferometry for change detection. Ground operations will be supported by the Deep Space Network and science operations coordinated through Jet Propulsion Laboratory and participating university teams. The mission timeline anticipates phased data releases modeled after Magellan (spacecraft) and Mars Global Surveyor to maximize community participation.
Expected scientific outcomes include refined maps of Venusian tectonic fabrics, identification and dating of volcanic resurfacing events through crater statistics and stratigraphic relations, and detection or constraints on recent volcanic activity via thermal anomalies and surface emissivity changes. Radar polarimetry may reveal roughness and dielectric properties tied to rock types, complementing geochemical context from studies of Venera lander samples and laboratory spectroscopy at Smithsonian Institution collections. Subsurface sounding could identify lava flow thicknesses and buried stratigraphy, enabling comparisons with terrestrial flood basalt provinces such as the Deccan Traps and Columbia River Basalt Group.
Processed products will include calibrated radar backscatter mosaics, digital elevation models derived from radar interferometry, polarimetric decomposition products, subsurface radargrams, and time-series change maps. Data pipelines will use algorithms adapted from Mars Reconnaissance Orbiter and Cassini processing toolchains, with community tools hosted at Planetary Data System nodes and distributed centers at Jet Propulsion Laboratory and participating universities. Data formats will adhere to Planetary Data System standards, enabling interoperability with legacy datasets from Magellan (spacecraft) and future missions.
Challenges include operations in the harsh thermal and radiative environment near Venus, management of large data volumes given limited downlink through the Deep Space Network, and balancing radar power requirements with spacecraft mass constraints—issues familiar from Magellan (spacecraft) and debated in Planetary Science Decadal Survey panels. Controversies may arise over prioritization of surface mapping versus in situ atmospheric probes, allocation of mission costs among stakeholders like NASA centers and industry, and interpretation of radar signatures where analogs on Earth and Mars remain ambiguous. Community discussions mirror past debates surrounding missions such as Venus In Situ Explorer and funding choices reflected in Decadal Survey recommendations.
Category:Proposed NASA missions