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Table 1 Summary of the Venus observations taken immediately after the VOI-R1 operation

From: AKATSUKI returns to Venus

  IR1 UVI LIR
Observation date Observation time (UT) December 7, 2015 4:51:56 December 7, 2015 5:19:53 December 7, 2015 5:26:02
Wavelength 0.90 μma 283 nm 10 μm
Exposure time (s) 3.0 0.25 34b
Distance between AKATSUKI and Venus (km) 6.8 × 104 7.2 × 104 7.3 × 104
Apparent diameter (°)c 10.4 9.7 9.6
Spatial resolution (km/pixel)d 14.2 15.1 63.9
Sub-observer point    
 Latitude (°) −6.7 −6.6 −6.6
 Longitude (°) 96.4 95.1 94.9
 Solar phase angle (°) 45.0 46.3 46.6
Subsolar point    
 Latitude (°) −2.6 −2.6 −2.6
 Longitude (°) 141.4 141.5 141.5
 Solar phase angle (°) 48.9 50.0 50.2
  1. aThe filter for dayside imaging was used
  2. bThe composite image was made by superimposing 32 images. Exposure time for an image was 1.1 s
  3. cA tangent height assumed to be 70 km from the surface was added to the radius of Venus (6051.8 km)
  4. dSpatial resolution was calculated with the pixel scale of 0.012 (°/pixel) for IR1 and UVI and 0.05 (°/pixel) for LIR