Interferometric mapping of the 3.3-mm continuum emission of comet 17P/Holmes after its 2007 outburst

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Volume 542 (June 2012)

A&A, 542 (2012) A73

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Table 2

Position of the brightness centre.

Date	Freq.	UT time^a	Ephemeris position (C)^b^,^c		Observed position (O)^b		(O–C)^d
			RA	Dec	RA	Dec	(RA, Dec)
(2007)	(GHz)	(h)	(h:min:s)	(°:′:″)	(h:min:s)	(°:′:″)	(″,″)

Total datasets
27 October	88.6	7.0000	03:51:30.418	50:19:16.48	03:51:30.418	50:19:16.76	(+0.00, +0.28)
28 October	90.6	8.0000	03:50:30.701	50:23:04.37	03:50:30.733	50:23:04.66	(+0.31, +0.29)

Subsets
27 October	88.6	7.0000	03:51:30.418	50:19:16.48	03:51:30.436	50:19:16.59	(+0.17, +0.11)
28 October	90.6	6.0000	03:50:35.552	50:22:46.94	03:50:35.569	50:22:47.26	(+0.16, +0.31)

Notes.

^(a)

Reference time for the position in RA, Dec of the comet.

^(b)

The coordinate system is apparent positions, geocentric frame.

^(c)

Ephemeris computed from the HORIZONS system, solution JPL K077/15 based on 3265 astrometric data from 1964 July 16 to 2008 April 22.

^(d)

Offset between the peak of the continuum emission and the position given by the ephemeris.

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