# Properties

 Label 1.307.a Base Field $\F_{307}$ Dimension $1$ Ordinary No $p$-rank $0$ Principally polarizable Yes Contains a Jacobian Yes

## Invariants

 Base field: $\F_{307}$ Dimension: $1$ L-polynomial: $1 + 307 x^{2}$ Frobenius angles: $\pm0.5$ Angle rank: $0$ (numerical) Number field: $$\Q(\sqrt{-307})$$ Galois group: $C_2$ Jacobians: 12

This isogeny class is simple and geometrically simple.

## Newton polygon

This isogeny class is supersingular. $p$-rank: $0$ Slopes: $[1/2, 1/2]$

## Point counts

This isogeny class contains the Jacobians of 12 curves, and hence is principally polarizable:

 $r$ 1 2 3 4 5 6 7 8 9 10 $A(\F_{q^r})$ 308 94864 28934444 8882685504 2727042318308 837202049589136 257021011458116444 78905450499876000000 24223973308916016636308 7436759805842671191982864

 $r$ 1 2 3 4 5 6 7 8 9 10 $C(\F_{q^r})$ 308 94864 28934444 8882685504 2727042318308 837202049589136 257021011458116444 78905450499876000000 24223973308916016636308 7436759805842671191982864

## Decomposition and endomorphism algebra

Endomorphism algebra over $\F_{307}$
 The endomorphism algebra of this simple isogeny class is $$\Q(\sqrt{-307})$$.
Endomorphism algebra over $\overline{\F}_{307}$
 The base change of $A$ to $\F_{307^{2}}$ is the simple isogeny class 1.94249.xq and its endomorphism algebra is the quaternion algebra over $$\Q$$ ramified at $307$ and $\infty$.
All geometric endomorphisms are defined over $\F_{307^{2}}$.

## Base change

This is a primitive isogeny class.

## Twists

This isogeny class has no twists.