2009
DOI: 10.2322/tstj.7.tk_1
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The Exploration of Lunar Gravity by VLBI Observations of SELENE (Kaguya)

Abstract: SELENE (Kaguya), which was successfully launched on Sep. 14, 2007, consists of the main orbiter, and two small free-flying sub-satellites, called Rstar (OKINA) and Vstar (OUNA). We use multi-frequency VLBI to measure the angular distance between the two sub-satellite radio sources Okina and Ouna in order to improve the accuracy of the low degree gravitational harmonics and the gravity field near the limb. The observations are made at three frequencies in S-band, (2212, 2218 and 2287 MHz), and one in X-band, (8… Show more

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“…Analysis of the coverage considering the four-way links indicates that our methods will yield a global gravity map and will improve the model of the gravity coefficients between 5 and 35 degrees by an order of magnitude compared to LP165P 6) . Differential VLBI Radio Sources (VRAD) on Rstar and Vstar enable phase-delay differential VLBI observations with multi-frequency methods 7) . VRAD is composed of the radio sources on Rstar and Vstar.…”
Section: Mission For Selenodetic Measurementsmentioning
confidence: 99%
“…Analysis of the coverage considering the four-way links indicates that our methods will yield a global gravity map and will improve the model of the gravity coefficients between 5 and 35 degrees by an order of magnitude compared to LP165P 6) . Differential VLBI Radio Sources (VRAD) on Rstar and Vstar enable phase-delay differential VLBI observations with multi-frequency methods 7) . VRAD is composed of the radio sources on Rstar and Vstar.…”
Section: Mission For Selenodetic Measurementsmentioning
confidence: 99%