[PPS06-01] Next generation Japan's Venus Exploration in 2020s
Keywords:Venus, Exploration, Lagrange points
We are considering that two small probes put at the Lagrange 1 and 2 points of Venus, which is located almost 106 km from its dayside and nightside. This idea is inspired by Limaye and Kovalenko 1. From Lagrange 1(2) point, the dayside (nightside) hemisphere can be always observed. The radius of the Lissajous orbits depends on the delta-V which is required in the insertion. We assumed that the observation phase angle is 25 degrees and estimated total delta-V (for the orbit maneuver to Venus and L1(2) Lissajous orbit insertion) as 720 m s-1.
One idea is to use JAXA’s Epsilon launcher. Epsilon launch vehicle of JAXA is expected to launch 200-250 kg mass to Venus. Then the weight of each probe is about 100 kg, and the required fuel (monopropellant) for the delta-V is estimated to be 36 kg. Assuming 10 kg for the science payload, remaining mass of 54 kg can be used for the bus system including the propulsion, telecommunication, etc. Other possibilities inserting two probes to Lagrange points of Venus, e.g. using H3 launch vehicle or others, should be investigated.
We will discuss follow up Venus science as well as more detail of our future mission plan (launcher, orbit insertion, probe system, etc.) to Venus in the presentation.
1. Monitoring Venus and communications relay from Lagrange Points, Limaye and Kovalenko, Planetary and Space Science 2019, https://doi.org/10.1016/j.pss.2019.104710