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Near-Earth asteroids (NEAs) are organized into five main classes: Amor,Apollo, Aten, Atira and 'Ayl\'{o}'chaxnim. Asteroids belonging to the'Ayl\'{o}'chaxnim class are located entirely within the orbit of Venus makingthem difficult to detect by ground-based observatories. The first-knownasteroid of this class, (594913) 'Ayl\'{o}'chaxnim, was discovered by theZwicky Transient Facility (ZTF) in 2020 January during a twilight search forasteroids at small solar elongations that ran between September 2019 andJanuary 2020. Due to its large diameter of $\sim$2 km, the discovery of(594913) 'Ayl\'{o}'chaxnim is surprising because contemporary NEA populationmodels predict a scarcity of asteroids of this size located inside the orbit ofVenus. To compare the discovery of (594913) 'Ayl\'{o}'chaxnim by ZTF with thepredictions of NEA population models, we estimated the ZTF survey completenessat detecting 'Ayl\'{o}'chaxnim asteroids and the number of 'Ayl\'{o}'chaxnimasteroids expected to have been discovered by simulating observations ofsynthetic 'Ayl\'{o}'chaxnim asteroids. We find that the 'Ayl\'{o}'chaxnimpopulation completeness of the survey is $\sim$18$\%$ and there is only a 5$\%$probability that a single 'Ayl\'{o}'chaxnim asteroid would have beendiscovered. Given the small chance for (594913) 'Ayl\'{o}'chaxnim to have beendiscovered, its presence is either a statistical fluke or it implies thatasteroid population models may need to be revised.

Preliminary estimates of the Zwicky Transient Facility 'Ayl\'o'chaxnim asteroid population completeness