Heimdal is a relatively recent

impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact crater ...

on the

planet A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a you ...

Mars Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, only being larger than Mercury. In the English language, Mars is named for the Roman god of war. Mars is a terrestrial planet with a thin at ...

. It lies in

Vastitas Borealis (Latin 'northern waste') is the largest lowland region of Mars. It is in the northerly latitudes of the planet and encircles the northern polar region. Vastitas Borealis is often simply referred to as the northern plains, northern lowlands or ...

, the northern plain. It is named after the Norwegian town of

Heimdal Heimdal is a borough in the city of Trondheim in the municipality of Trondheim in Trøndelag county, Norway. It covers the western and southwestern parts of the municipality. The village area that is also called Heimdal is located in the southe ...

. The crater is approximately 20 kilometers from the landing site of the

Phoenix lander ''Phoenix'' was an uncrewed space probe that landed on the surface of Mars on May 25, 2008, and operated until November 2, 2008. ''Phoenix'' was operational on Mars for sols ( days). Its instruments were used to assess the local habitabilit ...

. The landing site area is believed to be blanketed by ejecta excavated by the impact that created Heimdal, approximately 600 million years ago. The spacecraft was photographed during landing by the

Mars Reconnaissance Orbiter ''Mars Reconnaissance Orbiter'' (MRO) is a spacecraft designed to study the geology and climate of Mars, provide reconnaissance of future landing sites, and relay data from surface missions back to Earth. It was launched on August 12, 2005, an ...

, and was captured parachuting in the line of sight to the crater. While appearing to be over the crater, the craft was actually 20 km in front of it.

References

External links

Announcement of naming
* Impact craters on Mars Mare Boreum quadrangle {{Mars-stub