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 $2$ are rational) | Cusp widths | $1^{4}\cdot4\cdot16$ | Cusp orbits | $1^{2}\cdot2^{2}$ | ||
| Elliptic points: | $0$ of order $2$ and $0$ of order $3$ | ||||||
| $\Q$-gonality: | $1$ | ||||||
| $\overline{\Q}$-gonality: | $1$ | ||||||
| Rational cusps: | $2$ | ||||||
| Rational CM points: | none |
Other labels
| Cummins and Pauli (CP) label: | 16C0 |
| Rouse and Zureick-Brown (RZB) label: | X115e |
| Rouse, Sutherland, and Zureick-Brown (RSZB) label: | 16.48.0.39 |
Level structure
| $\GL_2(\Z/16\Z)$-generators: | $\begin{bmatrix}9&6\\0&3\end{bmatrix}$, $\begin{bmatrix}11&9\\12&15\end{bmatrix}$, $\begin{bmatrix}13&8\\8&9\end{bmatrix}$ |
| Contains $-I$: | no $\quad$ (see 16.24.0.i.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 82 stored non-cuspidal points.
Maps to other modular curves
$j$-invariant map of degree 24 to the modular curve $X(1)$ :
| $\displaystyle j$ | $=$ | $\displaystyle 2^8\,\frac{x^{24}(x^{8}+4x^{4}y^{4}+y^{8})^{3}}{y^{4}x^{40}(2x^{2}-2xy+y^{2})(2x^{2}+2xy+y^{2})}$ |
Modular covers
This modular curve minimally covers the modular curves listed below.
| Covered curve | Level | Index | Degree | Genus | Rank |
|---|---|---|---|---|---|
| 8.24.0-8.o.1.1 | $8$ | $2$ | $2$ | $0$ | $0$ |
| 16.24.0-8.o.1.4 | $16$ | $2$ | $2$ | $0$ | $0$ |
This modular curve is minimally covered by the modular curves in the database listed below.