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Ina (crater)
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Ina (crater)
Ina is a peculiar small depression ("crater" in IAU nomenclature) on the Moon, in Lacus Felicitatis. It is D-shaped, 2.9 km × 1.9 km wide and 64 m deep (from the deepest point of the bottom to the highest point of the rim).
Ina is remarkable for several dozens low hills with flat or rounded tops and very sharp rounded boundaries, looking like drops of mercury. Their surface looks like the usual surface of the Moon while the space between them is very different. Ina is the most prominent of several dozen similar features on the Moon. Their origin is unclear.
Ina was discovered on photographs taken in 1971 by the crew of Apollo 15 from lunar orbit. It could have been found 5 years earlier on images taken by Lunar Orbiter 4 had a photographic flaw not prevented this. At the end of 1972 Ina was observed and photographed by the crew of Apollo 17. After Apollo it was reconnoitred by several orbiting spacecraft beginning in 2009 when the Lunar Reconnaissance Orbiter obtained photos of Ina with resolution of about 0.5 m/pixel and with varying illumination angles.
On a topophotomap published in 1974 by NASA this feature was given the Latin female name Ina, in accordance with the convention to give small lunar craters human first names. In 1979 this name was adopted by the International Astronomical Union. In Apollo-era publications the feature is called D-caldera due to its shape, and at the time it was believed to be a unique feature on the moon.
Two neighbouring features were named in 1976. They are the small craters Osama on Ina's southwestern edge and Dag to its northwest (both 400 m in diameter). The widest hill in the eastern part of Ina (650 m wide) was named Mons Agnes in 1979.
In July 2023, NASA announced the selection of a new scientific payload called Dating an Irregular Mare Patch with a Lunar Explorer (DIMPLE) to establish the age and composition of volcanic activity at Ina.
Ina is located on top of a rounded upland (dome) 300 m high and 15 km in diameter. It is situated on an elongated plateau (horst) about 30 km wide. This plateau stands in the middle of Lacus Felicitatis ‒ a small lunar lake between Mare Serenitatis, Mare Vaporum and Mare Imbrium.
Ina is a D-shaped depression 2.9 km × 1.9 km wide. It has an elevated rim 600–1000 m wide and 30–40 m high. The eastern part of the rim is 10 m higher than the western. Its outer slope is very gently sloping (1°–3°) and lacks a distinct edge while the inner slope is very steep (tens of degrees) and has a very sharp border with the depression. The deepest point of the depression is located somewhat to the northwest of its center. This point is 30 m deeper than the edges of the depression and 64 m deeper than the highest point of the rim.
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Ina (crater)
Ina is a peculiar small depression ("crater" in IAU nomenclature) on the Moon, in Lacus Felicitatis. It is D-shaped, 2.9 km × 1.9 km wide and 64 m deep (from the deepest point of the bottom to the highest point of the rim).
Ina is remarkable for several dozens low hills with flat or rounded tops and very sharp rounded boundaries, looking like drops of mercury. Their surface looks like the usual surface of the Moon while the space between them is very different. Ina is the most prominent of several dozen similar features on the Moon. Their origin is unclear.
Ina was discovered on photographs taken in 1971 by the crew of Apollo 15 from lunar orbit. It could have been found 5 years earlier on images taken by Lunar Orbiter 4 had a photographic flaw not prevented this. At the end of 1972 Ina was observed and photographed by the crew of Apollo 17. After Apollo it was reconnoitred by several orbiting spacecraft beginning in 2009 when the Lunar Reconnaissance Orbiter obtained photos of Ina with resolution of about 0.5 m/pixel and with varying illumination angles.
On a topophotomap published in 1974 by NASA this feature was given the Latin female name Ina, in accordance with the convention to give small lunar craters human first names. In 1979 this name was adopted by the International Astronomical Union. In Apollo-era publications the feature is called D-caldera due to its shape, and at the time it was believed to be a unique feature on the moon.
Two neighbouring features were named in 1976. They are the small craters Osama on Ina's southwestern edge and Dag to its northwest (both 400 m in diameter). The widest hill in the eastern part of Ina (650 m wide) was named Mons Agnes in 1979.
In July 2023, NASA announced the selection of a new scientific payload called Dating an Irregular Mare Patch with a Lunar Explorer (DIMPLE) to establish the age and composition of volcanic activity at Ina.
Ina is located on top of a rounded upland (dome) 300 m high and 15 km in diameter. It is situated on an elongated plateau (horst) about 30 km wide. This plateau stands in the middle of Lacus Felicitatis ‒ a small lunar lake between Mare Serenitatis, Mare Vaporum and Mare Imbrium.
Ina is a D-shaped depression 2.9 km × 1.9 km wide. It has an elevated rim 600–1000 m wide and 30–40 m high. The eastern part of the rim is 10 m higher than the western. Its outer slope is very gently sloping (1°–3°) and lacks a distinct edge while the inner slope is very steep (tens of degrees) and has a very sharp border with the depression. The deepest point of the depression is located somewhat to the northwest of its center. This point is 30 m deeper than the edges of the depression and 64 m deeper than the highest point of the rim.
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