Venera-D (Russian: Венера-Д, pronounced [vʲɪˈnʲɛrə ˈdɛ]) is a proposed Russian space mission to Venus that would include an orbiter and a lander to be launched in 2026 or 2031. The orbiter's prime objective is to perform radar remote-sensing observations with the use of a powerful radar. A lander, based on the Venera design, is also planned, capable of operating for a long duration (24 h) on the planet's surface.
Artist's concept of the Venera-D spacecraft approaching clouds-veiled Venus
|Operator||Russian Federal Space Agency|
|Mission duration||Orbiter: ≥3 years (proposed)|
Lander: 2 - 24 h (proposed)
|Launch mass||5,800 - 7,000 kg |
|Dry mass||Orbiter: 990 kg|
Lander: 1,600 kg
|Payload mass||Orbiter instruments: 1,200 kg |
Lander instruments: 100 - 120 kg 
|Power||Orbiter: 1,700 W |
|Start of mission|
|Launch date||Proposed between 2026 - 2031|
|Rocket||Proton or Angara A5|
|Launch site||Vostochny Cosmodrome|
|Pericytherion altitude||300 km|
|Apocytherion altitude||500 km|
|Band||X band, Ka band |
|Capacity||16 Mbit/sec |
The "D" in Venera-D stands for "dolgozhivushaya," which means "long lasting" in Russian. Venera-D will be the first Venus probe launched by the Russian Federation (the earlier Venera probes were launched by the former Soviet Union). Venera-D will serve as the flagship for a new generation of Russian-built Venus probes, culminating with a lander capable of withstanding the harsh Venerian environment for more than the 1½ hours logged by the Soviet probes. The surface of Venus experiences average temperatures of 462° Celsius (864 Fahrenheit), crushing 90-bar pressures, and corroding clouds of carbon dioxide laced with sulfuric acid. Venera-D would be launched with either a Proton or Angara A5 rocket.
In 2003, Venera-D was proposed to the Russian Academy of Sciences for its "wish list" of scientific projects to be included into the Federal Space Program in 2006–2015. During the formulation of the mission concept in 2004, the launch of Venera-D was expected in 2013 and its landing on the surface of Venus in 2014. In its original conception, it had a large orbiter, sub-satellite, two balloons, two small landers, and a large, long-lived lander (24 h).
By 2011, the mission had been pushed back to 2018, and scaled back to an orbiter with a subsatellite orbiter, and a single lander with an expected 3-hour operation time. By the beginning of 2011, the Venera-D project entered Phase A (Preliminary Design) stage of development.
Following the loss of the Phobos-Grunt spacecraft in November 2011 and resulting delays in all Russian planetary projects (with the exception of ExoMars, a joint effort with the European Space Agency), the implementation of the project was again delayed to no earlier than 2026.
Lavochkin Association are leading the effort in the development of the mission concept architecture. It may include instruments from NASA. As of 2018, the second phase of the science activities between NASA and the Russian Space Research Institute (IKI) is refining the science concepts, the orbiter and lander mission architecture, as well as a detailed examination of the types of aerial platforms that could address key Venus science in situ. It is anticipated that additional workshops will be held as the mission concept develops. From the standpoint of total mass delivered to Venus, the best launch opportunities occur in 2026 and 2031.
The mission has an emphasis on the atmospheric superrotation, the geological processes that have formed and modified the surface, the mineralogical and elemental composition of surface materials, and the chemical processes related to the interaction of the surface and the atmosphere.
- Study of the dynamics and nature of superrotation, radiative balance, and the nature of the greenhouse effect
- Characterize the thermal structure of the atmosphere, winds, thermal tides, and solar locked structures
- Measure the composition of the atmosphere, study the clouds, their structure, composition, microphysics, and chemistry
- Investigate the upper atmosphere, ionosphere, electrical activity, magnetosphere, and the gas escape rate
- Perform chemical analysis of surface materials and study the elemental composition of the surface, including radiogenic elements
- Study of interaction between the surface and the atmosphere
- Investigate the structure and chemical composition of the atmosphere down to the surface, including the abundances and isotopic ratios of the trace and noble gases
- Perform direct chemical analysis of the cloud aerosols
- Characterize the geology of local landforms at different scales
Notional science instrumentsEdit
To achieve the mission's science goals, the team is assessing the following instruments for the orbiter: 
- PFS-VD Fourier transform spectrometer, 250–2000 cm-1 λ=5-45 μm, Δν = 1 cm-1
- UV mapping spectrometer, 190–490 nm, Δʎ=0.3 nm
- MM-radiometer, Millimeter Wave Radiometer; Ka, V and W bands
- UV-IR Imaging Spectrometer, VENIS
- Monitoring camera
- Solar and star occultation spectrometer, SSOE
- Infrared heterodyne spectrometer, IVOLGA
- Radio-science 1 Orbiter to ground, two-frequency occultation in S- and X-bands
- Radio-science 2 Ground to orbiter two-frequency occultation in S- and X-bands
- GROZA-SAS2-DFM-D, Electromagnetic waves generated by lightning and other electric phenomena
- Suite of 3 plasma instruments: 1) Panoramic energy mass-analyzer of ions; 2) CAMERA-O, electron spectrometer ELSPEC, fast neutrals analyzer FNA; 3) Energetic particle spectrometer.
- Lander instruments
The lander will carry between 100-120 kg of instruments, that may include: 
Potential NASA collaborationEdit
In 2014, Russian scientists asked NASA if the U.S. space agency would be interested in collaborating some instruments to the mission. Under this potential collaboration, the study team "Venera-D Joint Science Definition Team" (JSDT) was established in 2015. Venera-D could incorporate some US components, including balloons, a subsatellite for plasma measurements, or a long-lived (24 hours) surface station on the lander. Any potential collaboration is still under discussion, and as of late 2018, the second phase of the science definition activities between NASA and the Russian Space Research Institute (IKI) is currently underway. The Venera-D JSDT Phase 2 report will be completed by 31 January 2019.
Potential science instruments NASA could contribute include a Raman spectrometer and an Alpha-Proton X-Ray Spectrometer (APXS). Also, the three types of atmospheric maneuverable platforms under consideration by NASA include super pressure balloons, altitude controlled balloons, the Venus Atmospheric Maneuverable Platform (VAMP) semi-buoyant aircraft, and solar powered aircraft.
The solar-powered Venus Atmosphere Mobile Platform (VAMP) is currently under development by the Northrop-Grumman Corp. If included, it would be capable of flying within the cloud layer between 50–62 km, and is being developed to operate over the 117 Earth days needed for complete monitoring over one full Venus day. It would carry instruments to acquire observations of the atmospheric structure, circulation, radiation, composition and trace gas species, along with cloud aerosols and the unknown ultraviolet absorber(s).
Unrelated NASA lander proposals:
- NASA Studying Shared Venus Science Objectives with Russian Space Research Institute. NASA. 10 March 2017
- Senske, D.; Zasova, L. (31 January 2017). "Venera-D: Expanding our horizon of terrestrial planet climate and geology through the comprehensive exploration of Venus" (PDF). NASA. Retrieved 2017-10-29.
- Status Report of the Venera-D Joint Science Definition Team. D. Senske, L. Zasova, A. Burdanov, T. Economou, N. Eismont, M. Gerasimov, D. Gorinov, J. Hall, N. Ignatiev, M. Ivanov, K. Lea Jessup, I. Khatuntsev, O. Korablev, T. Kremic, S. Limaye, I. Lomakin, A. Martynov, A. Ocampo, S. Teselkin, O. Vaisberg, and V. Vorontsov. Lunar and Planetary Institute conference. 11 December 2017.
- Venera-D: Expanding our horizon of terrestrial planet climate and geology through the comprehensive exploration of Venus. Report of the Venera-D Joint Science Definition Team. 31 January 2017.
- Development of the Venera-D Mission Concept, from Science Objectives to Mission architecture. 49th Lunar and Planetary Science Conference 2018 (LPI Contrib. No. 2083).
- Venera-D Mission Concept for Study Atmosphere, Surface and Plasma Environment of Venus. 42nd COSPAR Scientific Assembly. Held 14-22 July 2018, in Pasadena, California, USA, Abstract id. PEX.1-26-18. July 2018.
- "РАН: запуск "Венеры-Д" состоится не ранее 2024 года". Gazieta.ru. 9 April 2012. Retrieved September 26, 2013.
- Wall, Mike (17 January 2017). "Russia, US Mulling Joint Mission to Venus". Space. Retrieved 2017-10-29.
- Venera-D mission at Russia Space Web (accessed 25 November 2013)
- Ted Stryk, Russia's Venera-D mission (DPS-EPSC 2011), Planetary Society, 10/05/2011 (accessed 25 November 2013)
- Should We Land on Venus Again? Scientists Are Trying to Decide. Meghan Bartels, Space.com. 2 October 2018.
- Report of the Venera-D Joint Science Definition Team. 31 January 2017. JSDT, VEXAG at NASA.
- Solar Airplane Concept Developed for Venus Exploration. (PDF) NASA. Glenn Research Center. 2018.