| Curve name |
$X_{509}$ |
| Index |
$96$ |
| Level |
$16$ |
| Genus |
$2$ |
| Does the subgroup contain $-I$? |
Yes |
| Generating matrices |
$
\left[ \begin{matrix} 7 & 0 \\ 0 & 15 \end{matrix}\right],
\left[ \begin{matrix} 1 & 0 \\ 8 & 15 \end{matrix}\right],
\left[ \begin{matrix} 1 & 0 \\ 0 & 7 \end{matrix}\right],
\left[ \begin{matrix} 5 & 10 \\ 8 & 1 \end{matrix}\right],
\left[ \begin{matrix} 5 & 0 \\ 8 & 1 \end{matrix}\right]$ |
| Images in lower levels |
|
| Meaning/Special name |
|
| Chosen covering |
$X_{193}$ |
| Curves that $X_{509}$ minimally covers |
$X_{193}$ |
| Curves that minimally cover $X_{509}$ |
|
| Curves that minimally cover $X_{509}$ and have infinitely many rational
points. |
|
| Model |
\[y^2 = 2x^5 - 4x^4 - 4x^2 - 2x\] |
| Info about rational points |
| Rational point | Image on the $j$-line |
| $(1 : 0 : 0)$ |
\[ \infty \]
|
| $(0 : 0 : 1)$ |
\[ \infty \]
|
|
| Comments on finding rational points |
The rank of the Jacobian is 0. We use the method of Chabauty. |
| Elliptic curve whose $2$-adic image is the subgroup |
None |
| Generic density of odd order reductions |
N/A |