remove faulty elements
| +-- density_sig: 0.008 g / cm3
| +-- density_ref: Nature vol. 537, pp515-517 (22 September 2016)
| +-- density_note: None
-| +-- rot_per: 9.07417 h
-| +-- rot_per_sig: 1e-06 h
-| +-- rot_per_ref: Nature vol. 537, pp515-517 (22 September 2016)
-| +-- rot_per_note: derived from published value: 952.1532 +/- 0.0001 deg./day
| +-- pole: 291.421/66.758
| +-- pole_sig: 0.007/0.002
| +-- pole_ref: Nature vol. 537, pp515-517 (22 September 2016)
