Takayoshi (Mercurian crater)
Takayoshi is an impact crater on Mercury, 136 km in diameter, centered at 37.23°S, 163.82°W in the planet's southern hemisphere.
| Key fact | Detail |
|---|---|
| Feature type | Crater on Mercury, IAU Gazetteer Feature ID 58311 |
| Diameter | 136 km (list value); the Gazetteer polygon geometry gives 135.86 km and 136.00 km, and the bounding-box entry gives 139.00 km1 |
| Location | Center latitude -37.23°, center longitude 163.82°W (equivalently about 196.2°E)1 |
| Geologic setting | Associated with smooth plains units regarded as among the oldest surfaces on Mercury, of pre-Tolstojan to Tolstojan age2 |
Naming
Mercury craters are named under an IAU convention that assigns them the names of artists, musicians, painters, and authors who have made outstanding or fundamental contributions to their field and have been recognized as art historically significant figures for more than 50 years.3
The Gazetteer of Planetary Nomenclature, maintained by the U.S. Geological Survey Astrogeology Science Center in cooperation with the IAU Working Group for Planetary System Nomenclature, records the crater as Feature ID 5831 with the clean name Takayoshi, target Mercury, and feature type crater.1
Location and setting
The crater lies at southern latitudes of about 37°S and longitudes near 164°W, which corresponds to roughly 196°E in the east-longitude convention used in some geological mapping.1 • 2 A geological mapping study that lists Takayoshi among reference craters places it in association with smooth plains units that are regarded as among the oldest surfaces on Mercury, with ages assigned to the pre-Tolstojan to Tolstojan periods, the earliest divisions of Mercury's stratigraphy.2
Observations
The MESSENGER spacecraft, the first to orbit Mercury, imaged the crater with its Narrow Angle Camera; image EN0227764948M was acquired at an emission angle of 23.0, an incidence angle of 77.4, and a phase angle of 85.5, with the crater centered near latitude -37.2 and longitude 195.6 in that image's convention.4 MESSENGER entered orbit in March 2011 and covered more than 99% of the planet's surface with imaging by the end of its one-Earth-year primary mission, providing global coverage at higher resolution and better illumination conditions than the earlier Mariner 10 imagery.5
References
- Gazetteer of Planetary Nomenclature, Feature 5831: Takayoshi, USGS Astrogeology Science Center
- Journal of Management and Planning Research (2025), geological units reference listing Takayoshi crater
- Categories (Themes) for Naming Features on Planets and Satellites, USGS/IAU
- MESSENGER photos of Mercury, Takayoshi crater image EN0227764948M
- Gault et al. (1975), Some comparisons of impact craters on Mercury and the Moon, Journal of Geophysical Research (context for Mariner 10 coverage and MESSENGER imaging)
Initially written Oct 20, 2026 · Edited: Oct 25, 2026
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