The Crater Theon Senior

Feature Profile & Selenographic Data

Feature type

crater

Coordinates

0.81° S · 15.42° E

Diameter

18.02 km

IAU approval

1935/01/01 00:00:00

LAC quadrangle

LAC-78 · Theophilus

Geological Chronicle

Theon Senior is a lunar impact crater that is located to the northwest of the crater Delambre, and south of D'Arrest. The formation spans an official diameter of 18.02 kilometers.

It forms a matching pair with Theon Junior, about two crater diameters to the south-southeast. It is recorded in the IAU Gazetteer under quadrangle LAC-78.

Chronology & Exploration

1. IAU Name Adopted

   The International Astronomical Union officially approves the crater name.

Scientific Sources & References

• IAU Gazetteer of Planetary Nomenclature — Of Smyrna; Greek mathematician and astronomer (c. A.D. 130).
• Wikipedia (en) — Theon Senior (crater)

Name Origin

Of Smyrna; Greek mathematician and astronomer (c. A.D. 130).