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Table 5

Parameters of the elliptic fit to the limb.

Apparent semi-major axis a′ = (383 ± 3) km
Apparent oblateness ɛ′ = 0.066 ± 0.047
Equivalent radius(a) km
Geometric albedo(b) pv = 0.099 ± 0.002
Position angle P′ = (67 ± 8) deg
Best fit (c)

Varda J2000 geocentric position(d) on September 10, 2018, at 03:34:00 UT

RA 17 18 25.12972 ± 0.197 mas
Dec –02 05 14.3055 ± 0.143 mas

Notes. (a) The apparent area-equivalent radius is , where c′ is the apparent polar radius. (b)We do not know the rotational phase of Varda at the occultation epoch, therefore we cannot account for the peak-to-peak Δmag =  0.06 mag amplitude of the rotational light-curve (Thirouin et al. 2010). This adds an additional uncertainty of ± 0.03 on p. (c) The calculation of is explained in the text. (d) The associated centre (fc, gc) = (47.0 ± 3.5, 62.0 ± 1.6) km of the ellipse (Fig. 6) measuresthe offsets in α and δ that is to beapplied to the adopted NIMAv6 ephemeris, which yields this new astrometric position.

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