Rapidly increasing collimation and magnetic field changes of a protostellar H2O maser outflow

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Table 1

Comparison of the fitted parameters of the ellipses from K13 (1999.25, 2005.89, 2007.41) and the present work (2012.54).

(1)	(2)	(3)	(4)	(5)	(6)
Epoch	a	b	PA	e ^a	Expansion velocity^b
	(mas)	(mas)	(°)		(mas yr^-1)	(km s^-1)

1999.25	71 ± 1^c	64 ± 1^c	5 ± 3^c	0.43 ± 0.01
2005.89	97 ± 3	93 ± 2	15 ± 45	0.28 ± 0.02	3.9 ± 0.5	24 ± 3
2007.41^c	111 ± 1	68 ± 1	45 ± 1	0.79 ± 0.02	9.2 ± 2.0	57 ± 12
2012.54	136 ± 4	73 ± 2	45 ± 2	0.84 ± 0.05	4.9 ± 0.8	30 ± 5
					4.9 ± 0.3^d	30 ± 2^d

Notes.

^(a)

Eccentricity, .

^(b)

From the difference in the semi-major axis size of the ellipse between different epochs (1999.25–2005.89; 2005.89–2007.41; 2007.41–2012.54).

^(c)

The considered epoch is May 29, 2007.

^(d)

Between epoch 1999.25 and epoch 2012.54.

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