Size comparison: Ceres vs Haumea

Here is the size comparison of the dwarf planets Ceres and Haumea.

Haumea is a trans-Neptunian dwarf planet. It is located in the Kuiper belt. It takes 284 years for Hauméa to go around the sun. It has the shape of a rugby ball, its dimensions are 2100 km by 1680 km by 1074 km. Two satellites orbit Haumea: Hi'iaka and Namaka. Haumea is the name of the goddess of fertility in Hawaiian mythology. This planet has a ring. It is mostly rocky, with a 70 km thick ice mantle at the poles and 170 km along its axis. The composition of Haumea's atmosphere is unknown. There are no high definition images of this planet.

Ceres is the smallest dwarf planet in the solar system. It is located in the main asteroid belt, between the planets Mars and Jupiter. Ceres is geologically dead. It is assumed to have an icy ocean between the core and the mantle. But it may be that this ocean is liquid if it holds ammonia in large quantities, thus serving as antifreeze. If so, then Ceres could be conducive to life.

There are mysterious bright spots in several craters, notably in the Occator crater which is 90 km wide, the Kupalo crater which is 26 km wide. Scientists assume that these clear spots are in fact mineral salts based on magnesium sulphate hexahydrate, clays rich in ammonia, materials composed of sodium carbonate, ammonium chloride, ammonium bicarbonate.

Mount Ahuna, which rises to 6,000 meters above sea level, is also of interest to astronomers, as it has a rather unusual conical shape.

Object	Ceres	Haumea
Type	Dwarf planet	Dwarf planet
Age	4.5 billion years	4.5 billion years
Diameter	938 km	2,100 km
Mean radius	469 km	816 km
Mass	1.3 × 1022 kg	4 × 1021 kg
Orbital period	4.6 years	284 years
Rotation duration	9 hours	4 hours
Surface temperature (average)	172 K -101 °C -150 °F	50 K -223 °C -369 °F
Surface gravity	0.28 m/s²	0.44 m/s²
Mean density	2.16 g/cm3	2.6 g/cm3
Orbital distance	419 million km	6.4 billion km
Circumference	2,946 km	5,127 km
Surface area	2.7 million km²	9.1 million km²
Volume	4.3 × 108 km3	2.2 × 109 km3
Escape velocity	1.21 km/s	0.84 km/s
Average orbital speed	0.51 km/s	4.53 km/s
Semi major axis	414 million km	6.4 billion km
Inclination	10.59°	28.2°
Crust composition	water ice, silicate	water ice, silicate
Distance from the Milky Way center	27,200 light years	27,200 light years

Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.