Table 1 Observations and occulting radii and altitudes of Venus at different wavelengths during the transit of June 2012.

From: Using the transit of Venus to probe the upper planetary atmosphere

Band

λ (Å)

Start time UTC (5 June)

End time UTC (6 June)

Radius (km)

Altitude versus clouds * (km)

Altitude versus surface (km)

Optical

4,500

23:30

01:16

6131±13†

0±13†

79±13†

Ultraviolet

1,700

22:26

04:14

6169±4

38±4

117±4

 

1,600

22:26

04:14

6179±3

48±3

127±3

Extreme ultraviolet

335

22:23

04:20

6228±6

97±6

176±6

 

304

22:23

04:20

6219±4

88±4

167±4

 

211

22:23

04:20

6214±3

83±3

162±3

 

193

22:23

04:20

6217±4

86±4

165±4

 

171

22:23

04:20

6216±4

85±4

164±4

X-rays

10

22:51

04:24

6202±6

71±6

150±6

  1. *‘Clouds’ is used here as reference altitude for simplicity, since the optical opacity in limb view is actually limited by clouds and haze on top of it without a precise boundary.
  2. †Upper limit for the uncertainty estimated as half of our sensitivity, that is, 0.1 pixels, with the SDO/AIA instrument in the optical band.
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