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Table 5 Estimated relative sensitivities and exposure time ratios for the new target asteroids

From: Inflight calibration of the optical navigation camera for the extended mission phase of Hayabusa2

Asteroid

Ryugu

2001 CC21

1998 KY26

Spectral types

C

L

L

Arrival date*

2018/06/27

2026/07/15

2031/07/15

Days since arrival at Ryugu

0

2940

4766

Estimated relative sensitivity [%]

–

80.6–84.1

77.8–84.1

Heliocentric distance [km]

1.4665E + 08

1.2062E + 08

1.6710E + 08

Albedo [%]

4

20

4

20

4

Exposure time ratio**

1

0.17

0.84

0.33

1.67

  1. *Because the exact arrival date has not yet been determined, we chose a date near the middle of the expected arrival month
  2. **Value for the worst expected sensitivity