Spectral and rotational properties of near-Earth asteroid (162173) Ryugu, target of the Hayabusa2 sample return mission

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Table 1

Observational circumstances.

Spectrum ID	Instrument	Date	UT_start	t_exp (s)	Airmass	Rot. phase (t₀ = 57 581.0 MJD)	Spec. slope (%/100 nm)

F01	FORS2	12 Jul. 2016	3:15	450	1.26	0.426	1.28
F02	FORS2	12 Jul. 2016	4:40	900	1.08	0.620	0.55
F03	FORS2	12 Jul. 2016	6:55	450	1.14	0.907	1.66
F04	FORS2	12 Jul. 2016	7:10	450	1.17	0.939	2.63
XS1	X-shooter	11 Aug. 2016	2:36	4 × 600/628^a	1.07	0.752	0.65
XS2	X-shooter	11 Aug. 2016	3:31	6 × 235/263^b	1.12	0.856	0.66
XS3	X-shooter	11 Aug. 2016	4:30	4 × 600/628^a	1.29	1.000	–1.18

Notes.

^(a)

Exposure time was of 600 s for UVB and NIR arms, 628 s for VIS arm.

^(b)

Exposure time was of 235 s for UVB and NIR arms, 263 s for VIS arm.

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