Beginning of activity in 67P/Churyumov-Gerasimenko and predictions for 2014–2015

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Table 1

Observational circumstances – 67P monitoring 2007/8.

Date	r^a	Δ^b	α^c	Exp^d	Filt.

7/8/07	4.55	3.86	10.1	10 × 60 (4)	R
10/9/07	4.41	4.21	13.1	10 × 60 (5)	R
10/10/07	4.28	4.55	12.5	20 × 60 (10)	R
12/11/07	4.13	4.82	9.2	10 × 60 (7)	R
15/11/07	4.11	4.83	8.8	20 × 30 (0)	R
27/3/08	3.39	3.80	14.6	3 × 15 + 4 × 60 (6)	VRI
29/3/08	3.38	3.76	14.9	3 × 15 + 4 × 60(6)	VRI
30/3/08	3.38	3.74	15.0	3 × 15 + 4 × 60(6)	VRI

Notes.

^(a)

Heliocentric distance (AU).

^(b)

Geocentric distance (AU).

^(c)

Phase angle (degrees).

^(d)

Number of exposures × exposure time (seconds) taken. The number in parenthesis gives the number of frames used in the analysis.

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