Invariants
| Level: | $16$ | $\SL_2$-level: | $16$ | ||||
| Index: | $48$ | $\PSL_2$-index: | $24$ | ||||
| Genus: | $0 = 1 + \frac{ 24 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 6 }{2}$ | ||||||
| Cusps: | $6$ (of which $4$ are rational) | Cusp widths | $1^{2}\cdot2^{3}\cdot16$ | Cusp orbits | $1^{4}\cdot2$ | ||
| Elliptic points: | $0$ of order $2$ and $0$ of order $3$ | ||||||
| $\Q$-gonality: | $1$ | ||||||
| $\overline{\Q}$-gonality: | $1$ | ||||||
| Rational cusps: | $4$ | ||||||
| Rational CM points: | none |
Other labels
| Cummins and Pauli (CP) label: | 16D0 |
| Rouse and Zureick-Brown (RZB) label: | X120f |
| Rouse, Sutherland, and Zureick-Brown (RSZB) label: | 16.48.0.33 |
Level structure
| $\GL_2(\Z/16\Z)$-generators: | $\begin{bmatrix}3&5\\8&1\end{bmatrix}$, $\begin{bmatrix}5&2\\8&5\end{bmatrix}$, $\begin{bmatrix}13&4\\8&1\end{bmatrix}$, $\begin{bmatrix}13&10\\8&3\end{bmatrix}$ |
| Contains $-I$: | no $\quad$ (see 16.24.0.e.1 for the level structure with $-I$) |
| Cyclic 16-isogeny field degree: | $2$ |
| Cyclic 16-torsion field degree: | $8$ |
| Full 16-torsion field degree: | $512$ |
Models
This modular curve is isomorphic to $\mathbb{P}^1$.
Rational points
This modular curve has infinitely many rational points, including 223 stored non-cuspidal points.
Maps to other modular curves
$j$-invariant map of degree 24 to the modular curve $X(1)$ :
| $\displaystyle j$ | $=$ | $\displaystyle -\frac{x^{24}(16x^{8}-128x^{6}y^{2}+80x^{4}y^{4}-16x^{2}y^{6}+y^{8})^{3}}{y^{2}x^{40}(2x-y)^{2}(2x+y)^{2}(8x^{2}-y^{2})}$ |
Modular covers
This modular curve minimally covers the modular curves listed below.
| Covered curve | Level | Index | Degree | Genus | Rank |
|---|---|---|---|---|---|
| 8.24.0-8.n.1.12 | $8$ | $2$ | $2$ | $0$ | $0$ |
| 16.24.0-8.n.1.2 | $16$ | $2$ | $2$ | $0$ | $0$ |
This modular curve is minimally covered by the modular curves in the database listed below.