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Triesnecker is a prominent lunar impact crater that is located in the Sinus Medii, near the central part of the Moon's near side. Its diameter is 25 km. It was named after Austrian astronomer Franz de Paula Triesnecker.[1] It is located to the north-northwest of the crater Rhaeticus, and to the east-southeast of the flooded Murchison.

Triesnecker crater rilles 4102 h1.jpg
Lunar Orbiter 4 image of Triesnecker crater and the Rille systerm
Coordinates4°11′N 3°36′E / 4.18°N 3.60°E / 4.18; 3.60Coordinates: 4°11′N 3°36′E / 4.18°N 3.60°E / 4.18; 3.60
Diameter25 km
Depth2.8 km
Colongitude356° at sunrise
EponymFranz de Paula Triesnecker

The crater rim of Triesnecker is somewhat distorted from a circular shape, having a notable bulge in the western wall, and lesser rises in the southeastern and northeastern rims. The inner walls are terraced and the interior is somewhat rough, with a central peak at the midpoint. Triesnecker has a ray system that is most prominent when the sun is at a high angle. The rays extend over 300 kilometers.

To the east of this crater is an extensive system of rilles extending over an area 200 kilometers across, running generally north–south. These were likely created by tectonic forces beneath the surface. Beyond, to the northeast, is the Rima Hyginus valley, with the crater Hyginus at the midpoint.


Satellite cratersEdit

Triesnecker crater and its satellite craters taken from Earth in 2012 at the University of Hertfordshire's Bayfordbury Observatory with the telescopes Meade LX200 14" and Lumenera Skynyx 2-1

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Triesnecker.

Oblique Apollo 10 image
Triesnecker Latitude Longitude Diameter
D 3.5° N 6.0° E 6 km
E 5.6° N 2.5° E 5 km
F 4.1° N 4.8° E 4 km
G 3.7° N 5.2° E 3 km
H 3.3° N 2.8° E 3 km
J 3.3° N 2.5° E 3 km


  1. ^ "Triesnecker (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
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  • Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.
  • Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revised ed.). Dover. ISBN 978-0-486-20917-3.
  • Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-62248-6.
  • Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.

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