De Roy (crater)
lunar impact crater
De Roy is a lunar impact crater that is located on the far side of the Moon, just behind the southwestern limb. This crater lies within the Mendel-Rydberg Basin, a 630 km wide impact basin of Nectarian age. De Roy is situated to the west of the crater Arrhenius, and east of the larger Lippmann.
This crater has a worn and rounded outer rim, forming a slightly irregular circle. A pair of tiny craterlets lie along the southeast rim, and there is a narrow cleft in the northern wall. The interior floor is level and nearly featureless, with only a few tiny crater pits to mark the surface.
This crater is named after Belgian journalist and amateur astronomer Felix de Roy (1883–1942), who was noted for his observation of variable stars. Its designation was formally adopted by the International Astronomical Union in 1970.
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to De Roy.
The following crater has been renamed by the IAU.
De Roy X — See Chadwick.
“De Roy (crater)” enters the record as lunar impact crater. Crown Archives preserves that source wording while asking what crater, lunar and impact can confirm, complicate or overturn.
Why this record matters
“De Roy (crater)” is worth following because a concise public description often conceals a longer documentary argument. Here, crater, lunar and impact provides the most credible route into that argument.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 13, 2026. The linked authority identifier is Q1748944. Authority coordinates are -55.240, -98.990. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1883, 1942 and 1970.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “De Roy (crater)”, its source revision and the description used here.
- Expand the search: follow De Roy (crater) primary sources, De Roy (crater) archive and crater research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “De Roy (crater)”?
- Which institution is responsible for the underlying evidence?
- What terminology or title could unlock a more precise catalogue search?
Search terms from this dossier
This entry incorporates text from “De Roy (crater)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.