Official name VRAD
Alternative name Ouna
Cospar ID 2007-039C
Norad ID 32056
Launch date 2007-09-14
Launch site TNSTA
Launch vehicle H-2A-2022
Country/Organization Japan
Type application Lunar Orbiter
Operator JAXA (ex NASDA)
RCS size UNKNOWN
Decay date ON ORBIT
Shape Hex Cyl + 1 Arm
Mass (kg) 2938
Diameter (m) 1
Height (m) 0.7
Span (m^2) 1.5
Power Solar cells, batteries

VRAD (Very-Long-Baseline-Interferometer Radio source), later renamed Ouna, is a subsatellite to the Japanese SELENE (Kaguya) lunar orbiter and will be used to conduct precise investigations on the position and precession of the Moon. Radio waves from the VRAD and RSat are received at VERA radio telescopes in NAOJ and others. Orbits of the sub-satellites are precisely determined by tracking the radio sources onboard sub-satellites with differential VLBI, which contributes the accuracy of the gravity field, especially on the lunar limb areas.

Satellite COSPAR Date LS Launch Vehicle Remarks
VRAD 2007-039C 2007-09-14 TNSTA H-2A-2022 with SELENE (Kaguya), Rstar (Okina)