Amaral is a

crater A crater is a landform consisting of a hole or depression (geology), depression on a planetary surface, usually caused either by an object hitting the surface, or by geological activity on the planet. A crater has classically been described ...

on the

planet A planet is a large, Hydrostatic equilibrium, rounded Astronomical object, astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. The Solar System has eight planets b ...

Mercury. With its smooth floor, surrounding

ejecta Ejecta (; ) are particles ejected from an area. In volcanology, in particular, the term refers to particles including pyroclastic rock, pyroclastic materials (tephra) that came out of a explosive eruption, volcanic explosion and magma eruption v ...

, and small

secondary crater Secondary craters are impact craters formed by the ejecta that was thrown out of a larger crater. They sometimes form radial crater chains. In addition, secondary craters are often seen as clusters or rays surrounding primary craters. The study of ...

s, it appears noticeably younger than the heavily cratered surface around it. Along with a smooth crater floor, Amaral also has a central peak. Bright material on this peak is of particular interest as it appears to have an unusual color. In color-enhanced images, the central peak of Amaral appears as a bright

blue Blue is one of the three primary colours in the RYB color model, RYB colour model (traditional colour theory), as well as in the RGB color model, RGB (additive) colour model. It lies between Violet (color), violet and cyan on the optical spe ...

color in striking contrast to the otherwise

orange Orange most often refers to: *Orange (fruit), the fruit of the tree species '' Citrus'' × ''sinensis'' ** Orange blossom, its fragrant flower ** Orange juice *Orange (colour), the color of an orange fruit, occurs between red and yellow in the vi ...

tones of surface material nearby. The different color of the central peak likely indicates rocks with different

chemical composition A chemical composition specifies the identity, arrangement, and ratio of the chemical elements making up a compound by way of chemical and atomic bonds. Chemical formulas can be used to describe the relative amounts of elements present in a com ...

from those on the neighboring surface. Amaral is the second-largest crater of the Kuiperian system on Mercury, at diameter, after Bartók at . It is followed by

Tyagaraja Sadguru Tyagaraja Swami ( Telugu: సద్గురు త్యాగరాజ స్వామి; 4 May 1767 – 6 January 1847), also known as Tyagayya, and in full as Kakarla Tyagabrahmam ( Telugu: కాకర్ల త్యాగబ ...

crater. A confirmed ''dark spot'' is present in southeastern Amaral.Zhiyong Xiao, Robert G. Strom, David T. Blewett, Paul K. Byrne, Sean C. Solomon, Scott L. Murchie, Ann L. Sprague, Deborah L. Domingue, Jörn Helbert, 2013. ''Dark spots on Mercury: A distinctive low-reflectance material and its relation to hollows''. Journal of Geophysical Research Planets.
doi.org/10.1002/jgre.20115
/ref> The crater Heaney is to the southeast of Amaral. Amaral crater EN0251518331M.jpg, High resolution view of the interior, from

MESSENGER Messenger, Messengers, The Messenger or The Messengers may refer to: People * Courier, a person or company that delivers messages, packages, or mail * Messenger (surname) * Bicycle messenger, a bicyclist who transports packages through cities * M ...

Amaral crater EN0236873588M.jpg, Oblique view at a low sun angle Amaral crater EN0264042540M EN0264071220M.jpg, Mosaic showing most of the crater at a high sun angle. Note the bright central peak complex. Amaral crater Heaney crater MESSENGER WAC IGF to RGB.jpg, Regional approximate color view with Amaral at left, showing its bright, extensive

ray system In planetary geology, a ray system comprises radial streaks of fine '' ejecta'' thrown out during the formation of an impact crater, looking somewhat like many thin spokes coming from the hub of a wheel. The rays may extend for lengths up to ...

References

Impact craters on Mercury {{Mercury-crater-stub