Inhomogeneities on the surface of 21 Lutetia, the asteroid target of the Rosetta mission - Ground-based results before the Rosetta fly-by

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Volume 513 (April 2010)

A&A, 513 (2010) L4

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Table 1:

Observational circumstances.
#	Date	$UT _{\rm start}$	$T_{\exp}$	Airm.	Spec.	Rot.	Sol. an.
					slope	phase	airm.
		(hh:mm)	(s)		(%/10 $^3~\AA$ )
1	2008 Nov. 27	23:39	8	1.07	1.5 $\pm$ 0.5	0.018	1.04
2	2008 Nov. 27	23:53	30	1.05	1.0 $\pm$ 0.5	0.046	1.04
3	2008 Nov. 28	00:49	40	1.01	1.4 $\pm$ 0.5	0.161	1.04
4	2008 Nov. 28	01:33	40	1.02	1.8 $\pm$ 0.5	0.251	1.04
5	2008 Nov. 28	02:23	40	1.07	2.2 $\pm$ 0.5	0.353	1.04
6	2008 Nov. 28	03:05	40	1.14	2.0 $\pm$ 0.5	0.438	1.04
7	2008 Nov. 28	03:54	40	1.30	2.1 $\pm$ 0.5	0.538	1.04
8	2008 Nov. 28	04:32	40	1.50	1.7 $\pm$ 0.5	0.616	1.04
9	2008 Nov. 29	22:18	40	1.23	0.7 $\pm$ 0.5	0.731	1.02
10	2008 Nov. 29	23:12	40	1.09	1.4 $\pm$ 0.5	0.841	1.02
11	2008 Nov. 29	23:13	30	1.09	1.6 $\pm$ 0.5	0.843	1.02
12	2008 Nov. 30	00:07	30	1.03	1.7 $\pm$ 0.5	0.953	1.02
13	2008 Nov. 30	00:57	40	1.01	1.7 $\pm$ 0.5	0.056	1.02

Notes. For each spectrum we report the starting time of acquisition corrected for light-time, the exposure length, the airmass of Lutetia, the spectral slope computed between 0.6 $\mu$ m and 0.75 $\mu$ m, the coverage of the rotational phase, and the airmass of the used solar analog.

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