Mapping the topography of Mercury with MESSENGER laser altimetry by Sun, Xiaoli, Cavanaugh, John, Neumann, Gregory A, Zuber, Maria, Smith, David Edmund

“…MLA had accumulated about 8.3 million laser ranging measurements to Mercury’s surface, as of 31 July 2012, i.e., over six Mercury years (528 Earth days).…”
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Seven Sisters: a mission to study fundamental plasma physical processes in the solar wind and a pathfinder to advance space weather prediction by Katariina Nykyri, Xuanye Ma, Brandon Burkholder, Yu-Lun Liou, Roberto Cuéllar, Shiva Kavosi, Joseph E. Borovsky, Jeff Parker, Mitchell Rosen, Lauren De Moudt, Robert Wilkes Ebert, Keiichi Ogasawara, Merav Opher, David Gary Sibeck, Simone Di Matteo, Simone Di Matteo, Nicholeen Viall, Samantha Wallace, Therese M. Jorgensen, Michael Hesse, Matthew J. West, Laxman Adhikari, Matthew R. Argall, Jan Egedal, Frederick Wilder, Jeffrey Broll, Gangkai Poh, Simon Wing, Christopher Russell

“…The Seven Sisters mission includes seven individual spacecraft designed to uncover fundamental physical processes in the solar wind and provides up to ≈ 2 days of advanced space weather warnings for 550 Earth days during the mission. The mission will collect critical measurements of the thermal and suprathermal plasma and magnetic fields, utilizing, for the first time, Venus–Sun Lagrange points. …”
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The 2010 European Venus Explorer (EVE) mission proposal by Wilson, C, Chassefiere, E, Hinglais, E, Baines, K, Balint, T, Berthelier, J, Blamont, J, Durry, G, Ferencz, C, Grimm, R, Imamura, T, Josset, J, Leblanc, F, Lebonnois, S, Leitner, J, Limaye, S, Marty, B, Palomba, E, Pogrebenko, S, Rafkin, S, Talboys, D, Wieler, R, Zasova, L, Szopa, C, Team, EVE

“…The balloon float lifetime would be at least 10 Earth days, long enough to guarantee at least one full circumnavigation of the planet. …”

Future and Planned Spacecraft Missions to Mars / by Workman, Miles, author 648278

“…The MSL Curiosity rover will be launched by an Atlas V 541 rocket and will be expected to operate for at least 1 Martian year (668 Martian sols/686 Earth days) as it explores with greater range than any previous Mars rover. …”
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Maps of Solar Wind Plasma Precipitation onto Mercury’s Surface: A Geographical Perspective by Federico Lavorenti, Elizabeth A. Jensen, Sae Aizawa, Francesco Califano, Mario D’Amore, Deborah Domingue, Pierre Henri, Simon Lindsay, Jim M. Raines, Daniel Wolf Savin

“…These maps are then integrated over two full Mercury orbits (176 Earth days). We found that the plasma precipitation pattern at the surface is most strongly affected by the upstream solar wind conditions, particularly the interplanetary magnetic field direction, and less by Mercury’s 3:2 spin–orbit resonance. …”
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Long-duration Venus lander for seismic and atmospheric science by Kremic, T, Ghail, R, Gilmore, M, Hunter, G, Kiefer, W, Limaye, S, Pauken, M, Tolbert, C, Wilson, C

“…An exciting and novel science mission concept called Seismic and Atmospheric Exploration of Venus (SAEVe) has been developed which uses high-temperature electronics to enable a three-order magnitude increase in expected surface life (120 Earth days) over what has been achieved to date. This enables study of long-term, variable phenomena such as the seismicity of Venus and near surface weather, near surface energy balance, and atmospheric chemical composition. …”