Invariants
| Level: | $308$ | $\SL_2$-level: | $4$ | ||||
| Index: | $24$ | $\PSL_2$-index: | $12$ | ||||
| Genus: | $0 = 1 + \frac{ 12 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 4 }{2}$ | ||||||
| Cusps: | $4$ (of which $2$ are rational) | Cusp widths | $2^{2}\cdot4^{2}$ | Cusp orbits | $1^{2}\cdot2$ | ||
| 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: | 4E0 |
Level structure
| $\GL_2(\Z/308\Z)$-generators: | $\begin{bmatrix}15&84\\221&205\end{bmatrix}$, $\begin{bmatrix}203&260\\221&175\end{bmatrix}$, $\begin{bmatrix}299&112\\264&123\end{bmatrix}$ |
| Contains $-I$: | no $\quad$ (see 44.12.0.g.1 for the level structure with $-I$) |
| Cyclic 308-isogeny field degree: | $96$ |
| Cyclic 308-torsion field degree: | $11520$ |
| Full 308-torsion field degree: | $106444800$ |
Models
This modular curve is isomorphic to $\mathbb{P}^1$.
Rational points
This modular curve has infinitely many rational points, including 323 stored non-cuspidal points.
Maps to other modular curves
$j$-invariant map of degree 12 to the modular curve $X(1)$ :
| $\displaystyle j$ | $=$ | $\displaystyle \frac{2^8}{11}\cdot\frac{(x+2y)^{12}(2x^{4}-30x^{3}y-65x^{2}y^{2}-30xy^{3}+2y^{4})^{3}}{(x-y)^{2}(x+y)^{2}(x+2y)^{12}(3x^{2}+5xy+3y^{2})^{4}}$ |
Modular covers
This modular curve minimally covers the modular curves listed below.
| Covered curve | Level | Index | Degree | Genus | Rank |
|---|---|---|---|---|---|
| 28.12.0-4.c.1.2 | $28$ | $2$ | $2$ | $0$ | $0$ |
| 308.12.0-4.c.1.2 | $308$ | $2$ | $2$ | $0$ | $?$ |
This modular curve is minimally covered by the modular curves in the database listed below.
| Covering curve | Level | Index | Degree | Genus |
|---|---|---|---|---|
| 308.192.5-308.k.1.2 | $308$ | $8$ | $8$ | $5$ |
| 308.288.9-44.k.1.1 | $308$ | $12$ | $12$ | $9$ |
| 308.504.16-308.s.1.4 | $308$ | $21$ | $21$ | $16$ |