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Table 2

Geometric properties of the elliptical belt.

Opticala 70 μm 160 μm

Semi-major axisa (AU)b 141 ± 2 137.5 ± 0.9 125 ± 3c
Eccentricity e 0.11 ± 0.01 0.125 ± 0.006 0.17 ± 0.07
Inclination i (°) 65.6 ± 0.4 65.6 ± 0.5 64 ± 2
Longitude of ascending node Ω (°) 156.0 ± 0.3 156.9 ± 0.5 160 ± 2
Argument of periastron ω (°) 31 ± 6 1 ± 6 ...   d
Offset between star and ring center (AU)e 15 ± 1 17.2 ± 0.9 ...   d

Notes. 

(b)

At peak surface brightness.

(c)

Spatial resolution of the 160 μm image is insufficient to derive a reliable semi-major axis.

(d)

Star not visible at 160 μm.

(e)

In the plane of the belt.

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