Parameters of the elliptic fit to the limb.
|Apparent semi-major axis||a′ = (383 ± 3) km|
|Apparent oblateness||ɛ′ = 0.066 ± 0.047|
|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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