Gemini 3 Fast: Collecting specific imagery and filter data for Venus flybys is a task of navigating archival data across decades of space exploration. Below is the breakdown for every major probe that performed a flyby of Venus and returned imagery.
- NASA PDS (Planetary Data System): The "master" archive for NASA missions (Galileo, Cassini, MESSENGER, Parker). pds-imaging.jpl.nasa.gov
- ESA PSA (Planetary Science Archive): The archive for BepiColombo and Solar Orbiter. archives.esac.esa.int/psa/
- NSSDC (National Space Science Data Center): For legacy missions (Mariner). nssdc.gsfc.nasa.gov
The first mission to return high-resolution imagery of Venus’s cloud tops.
- Where to Download: Images are archived at the NSSDC Image Catalog. Raw digital data is notoriously difficult to access as it predates modern PDS standards, but processed versions are available via the Mariner 10 Image Archive.
- Filters Used: 1. UV Bandpass (Primary for cloud structures) 2. Blue Bandpass 3. Yellow Bandpass 4. UV Polarizing 5. Minus UV High Pass 6. Clear 7. Wide-angle relay mirror (No filter) 8. Defocusing lens (Calibration only)
Performed a gravity assist flyby on its way to Jupiter.
- Where to Download: The PDS Image Atlas. Select "SSI" (Solid State Imager) under instruments.
- Filters Used:
- Violet (404 nm)
- Green (559 nm)
- Red (671 nm)
- Near-Infrared (756 nm, 889 nm, 990 nm)
- Clear
Performed two flybys. Because the spacecraft was so close to the Sun, the main camera covers (the "lens caps") were mostly kept closed, but some spectral data was captured.
- Where to Download: Cassini Raw Image Archive. Filter for year 1998/1999 and Target "Venus."
- Filters Used:
- VIMS (Visual and Infrared Mapping Spectrometer): Captured night-side thermal emissions. This uses a continuous spectrum (0.3 to 5.1 µm) rather than discrete filters.
- ISS (Imaging Science Subsystem): Primarily calibration images. Filters used included Clear, UV1, and various IR filters (IR1, IR2).
Two flybys en route to Mercury.
- Where to Download: PDS Geosciences Node (MESSENGER). Use the MDIS (Mercury Dual Imaging System) folders.
- Filters Used:
- MDIS-WAC (Wide Angle Camera): 11 narrowband filters ranging from 415 nm to 1015 nm (Violet to Near-IR).
- MDIS-NAC (Narrow Angle Camera): Monochrome only (broadband).
The WISPR instrument unexpectedly captured the first visible-light images of the Venusian surface by "seeing through" the clouds at specific wavelengths.
- Where to Download: Parker Solar Probe Gateway (Naval Research Lab) or NASA PDS.
- Filters Used: * WISPR (Wide-field Imager): Does not use a filter wheel. It uses a fixed, broad-band visible to near-infrared response (approximately 450–950 nm).
- Note: Surface features were visible because the atmosphere is transparent in a narrow "window" near 1 micron, which falls within the WISPR detector's sensitivity.
A joint ESA/JAXA mission to Mercury.
- Where to Download: ESA PSA (BepiColombo).
- Filters Used:
- MCAM (Monitoring Cameras): These are essentially "selfie cams" (GoPro-style). They are Monochrome only (Black and White) and do not use interchangeable filters.
- MERTIS (Spectrometer): Infrared spectral data (7–14 µm and 3–5 µm); no discrete "filters" in the traditional imaging sense.
Captured Venus to assist with orbital tilting.
- Where to Download: Solar Orbiter Archive (SOAR).
- Filters Used:
- SoloHI (Heliospheric Imager): Visible light, broadband.
- PHI & EUI: Ultraviolet/Extreme Ultraviolet (EUV) filters centered on specific solar emission lines (e.g., 17.4 nm), though these mostly capture the Venusian silhouette or exosphere.
- Mariner 2 & 5: These probes did not carry imaging systems in the visible/UV spectrum. Mariner 2 had a Microwave Radiometer and Infrared Radiometer, but no "camera" with filters.
- Venera 11–14 (Flyby components): While these missions are famous for surface landers, the "Flyby/Bus" segments primarily acted as data relays and did not carry imaging systems for the planet itself.
- Vega 1 & 2: These flybys released landers and balloons. The flyby bus cameras were designed for Comet Halley; they did not perform a primary imaging campaign of Venus during the flyby. Filter data for Venus specifically is not mentioned in public mission logs for the Vega bus.
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First, a scoping note: several probes that flew by Venus had no cameras at all (Mariner 2, Mariner 5, Venera 1). The Vega 1/2 flyby buses had TV cameras, but those were pointed at Comet Halley — they didn't image Venus during the flyby itself. MESSENGER's first Venus flyby (Oct 2006) entered solar conjunction and no observations were conducted. So the actual image-producing flyby list is shorter than the full flyby list.
Camera: Twin vidicon cameras (700 and 1400mm) Filters: near-ultraviolet filter (primary), orange filter also used. The UV work was the science payload — the UV filter brings out details in the Venusian clouds which are otherwise featureless to the human eye.
Download: NASA Photojournal — photojournal.jpl.nasa.gov/spacecraft/Mariner+10
Raw PDS data via the PDS Imaging Node at pds-imaging.jpl.nasa.gov
Cameras: SSI (Solid State Imager) + NIMS (Near-Infrared Mapping Spectrometer)
SSI imaging: day-side, mostly violet filter, a little clear, some near-infrared. No color images. NIMS: night-side lower cloud mapping and atmospheric studies; two partial-disk mosaics, plus scans for water and other gas distribution. Ultraviolet: scans for upper atmosphere composition and distribution.
Data from the Solid State Imager (SSI) and the Near-Infrared Mapping Spectrometer (NIMS) are archived in the Imaging Node. Dataset go_0002 contains SSI images; go_1001 and go_1101 contain NIMS EDRs and CUBEs respectively.
Download: atmos.nmsu.edu/data_and_services/atmospheres_data/Galileo_Venus/venus.html — links out to PDS Imaging Node and PDS PPI Node
Cameras: ISS NAC + WAC (Imaging Science Subsystem); VIMS (Visual-Infrared Mapping Spectrometer) also operated
Several of the Cassini Orbiter scientific instruments were briefly switched on to make observations during the Venus flyby.
Download: PDS Imaging Node — pds-imaging.jpl.nasa.gov/portal/cassini_mission.html
OPUS search engine at the Ring-Moon Systems Node allows filtering by target Venus. The NMSU data page at pds-atmospheres.nmsu.edu/data_and_services/atmospheres_data/Cassini_PDS3/Cassini.html links to atmospheric data.
Flyby 1: MESSENGER passed behind Venus and entered superior conjunction, a period when Earth was on the exact opposite side of the Solar System, with the Sun inhibiting radio contact. For this reason, no scientific observations were conducted during the flyby.
Flyby 2 cameras: MDIS WAC (11-color filter wheel) + NAC (single filter) During the encounter, all instruments were used to observe Venus and prepare for the following Mercury encounters. The encounter provided visible and near-infrared imaging data of the upper atmosphere of Venus.
One filter is specifically cited in the mission documentation: the departure sequence consists of MDIS frames at 430-nm wavelength filter. The WAC's 11 color filters span UV through near-IR but which were used for Venus isn't fully enumerated in public summaries.
Download:
- PDS Imaging Node:
pds-imaging.jpl.nasa.gov/portal/messenger_mission.html - PDS Geosciences Node:
pds-geosciences.wustl.edu/missions/messenger/index.htm - NASA Open Data Portal has the MDIS EDR dataset with all cruise/flyby images
Cameras: MCAM 1, 2, 3 (M-CAM monitoring cameras on Mercury Transfer Module)
The sequence includes images from all three Monitoring Cameras (MCAM) onboard the Mercury Transfer Module, which provides black-and-white snapshots in 1024 x 1024 pixel resolution. It is not possible to image with the high-resolution camera suite during the cruise phase.
Flyby 1: MCAM 1 and 2 only (MCAM 3 not activated) Flyby 2: All three MCAMs
Filters: None. The MCAMs are engineering/monitoring cameras — broadband monochrome, no optical filter wheel.
Download: ESA Planetary Science Archive — archives.esac.esa.int/psa/
The PSA is the canonical archive for all BepiColombo data including both Venus flyby image sequences.
Camera: WISPR-I (inner telescope); WISPR-O (outer telescope, flyby 4 only)
WISPR picked up a range of wavelengths from 470 nanometers to 800 nanometers — this spans visible red to near-infrared. The instrument has no narrowband filter; it's a broadband white-light imager repurposed for planetary observation.
WISPR was designed to see faint features in the solar atmosphere and wind. But instead of just seeing clouds, WISPR also saw through to the surface of the planet. The surface thermal emission detection was an unexpected result.
Flybys 1 and 2 (Venus dayside passes) and flyby 5 onward: check the mission timeline — the published Venus images are specifically from flybys 3 and 4.
Download: WISPR team archive — wispr.nrl.navy.mil/wisprdata
All data released as FITS files with encounter-by-encounter zip archives. The PSP data also mirrors into the PDS.
Filters: None (broadband 470–800nm).
Solar Orbiter — flyby 1: Dec 27, 2020; flyby 2: Aug 9, 2021; flyby 3: Sep 3, 2022; flyby 4: Feb 18, 2025
Camera: SoloHI (Solar Orbiter Heliospheric Imager), operated by Naval Research Lab
The Solar Orbiter Heliospheric Imager, or SoloHI, telescope captured this gleaming view of the planet. SoloHI is a white-light imager (visible broadband, designed for solar wind studies).
Filters: None (broadband visible, no narrowband filter).
Download: ESA Solar Orbiter Science Archive — soar.esac.esa.int
SoloHI data also available via NASA SPDF.
The best single starting point for most of these datasets is pds-atmospheres.nmsu.edu/Venus/venus.html — it has organized links to Galileo, Cassini, and MESSENGER Venus data with notes on which instruments collected what.
| Probe | Date | Camera | Filters | Download |
|---|---|---|---|---|
| Mariner 10 | Feb 1974 | Twin vidicon | Near-UV, orange | PDS Imaging Node / Photojournal |
| Galileo | Feb 1990 | SSI, NIMS | Violet, clear, near-IR | PDS (go_0002, go_1001) |
| Cassini | Apr 1998, Jun 1999 | ISS NAC/WAC, VIMS | PDS Imaging Node / OPUS | |
| MESSENGER | Jun 2007 only | MDIS WAC + NAC | 430nm confirmed; others |
PDS Imaging Node |
| BepiColombo | Oct 2020, Aug 2021 | MCAM 1/2/3 | None (broadband mono) | ESA PSA |
| Parker Solar Probe | Jul 2020, Feb 2021 | WISPR-I, WISPR-O | None (470–800nm broad) | wispr.nrl.navy.mil |
| Solar Orbiter | Aug 2021 confirmed; others |
SoloHI | None (broadband white-light) | soar.esac.esa.int |
The two biggest gaps here are Cassini's filter set (the data is in OPUS but not summarized anywhere) and Solar Orbiter's imaging activity across all four flybys (the Aug 2021 one is documented; the others need confirmation in the mission telemetry).