Hanami Planum

On 5 March 2015, NASA's Dawn spacecraft entered orbit around Ceres, observing and mapping its surface features in detail for the first time.^[3] The plateau was originally given the name Erntedank Planum by the International Astronomical Union (IAU) on 4 December 2015, after the German thanksgiving festival of Erntedankfest.^[4] However, the name was dropped on 20 June 2016 and replaced with Hanami Planum. The new name comes from Hanami, the Japanese custom of viewing cherry blossoms.^[1]

Hanami Planum is a highland area centered near 15°N, 130°W, primarily placing it inside the Occator quadrangle. Spanning about 555 kilometres (345 mi) and rising as high as 6 kilometres (3.7 mi), it is the only discrete topographic high on Ceres^{[5]: 130 [2]: 741} It is the third largest geological feature on Ceres, after Vendimia Planitia and Samhain Catenae;^[6] the latter broadly coincides with Hanami Planum.^[7]: 11 Several major named craters occupy the highland, including Nepen, Azacca, Lociyo, and the bright Occator.^{[5]: 130 [6]} Other major craters border Hanami Planum, such as Kirnis to the east and Ezinu to the northwest.^{[5]: 130 [8]: 3195}

Hanami Planum is associated with a broad, distinct negative isostatic gravity anomaly,^[2]: 741 meaning that local gravity is weaker than normal.^[9] The negative gravity anomalies suggest that Hanami Planum lies in a region of low-density material, with a mass deficit of 97.1+1.6
−1.5×10¹⁶ kg, ~0.1% the mass of Ceres. The region includes the most extreme negative anomaly observed on Ceres, with a strength of < –95 mGal southeast of Occator at 12°N, 113°W. This anomaly is associated with a 70 by 30 kilometres (43 mi × 19 mi) dome that rises 2–3 kilometres (1.2–1.9 mi) above the surrounding terrain. Another distinct local anomaly crosses Samhain Catenae. It overlaps with a large dome within Kirnis and a 2 kilometres (1.2 mi) high dome to the southwest.^{[2]: 741–742}

• Yamor Mons – A mountain on Ceres whose name was changed from Ysolo Mons in 2016