## The modular curve $X_{24h}$

Curve name $X_{24h}$
Index $24$
Level $8$
Genus $0$
Does the subgroup contain $-I$? No
Generating matrices $\left[ \begin{matrix} 3 & 0 \\ 0 & 5 \end{matrix}\right], \left[ \begin{matrix} 1 & 0 \\ 0 & 3 \end{matrix}\right], \left[ \begin{matrix} 1 & 0 \\ 4 & 1 \end{matrix}\right], \left[ \begin{matrix} 3 & 6 \\ 6 & 3 \end{matrix}\right]$
Images in lower levels
 Level Index of image Corresponding curve $2$ $6$ $X_{8}$ $4$ $12$ $X_{24}$
Meaning/Special name
Chosen covering $X_{24}$
Curves that $X_{24h}$ minimally covers
Curves that minimally cover $X_{24h}$
Curves that minimally cover $X_{24h}$ and have infinitely many rational points.
Model $\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is given by $y^2 = x^3 + A(t)x + B(t), \text{ where}$ $A(t) = -108t^{8} - 324t^{6} - 432t^{4} - 324t^{2} - 108$ $B(t) = 432t^{12} + 1944t^{10} + 2592t^{8} - 2592t^{4} - 1944t^{2} - 432$
Elliptic curve whose $2$-adic image is the subgroup $y^2 = x^3 - x^2 - 758x - 7488$, with conductor $2400$
Generic density of odd order reductions $289/1792$