Invariants
Base field: | $\F_{491}$ |
Dimension: | $1$ |
L-polynomial: | $1 - 30 x + 491 x^{2}$ |
Frobenius angles: | $\pm0.263305417204$ |
Angle rank: | $1$ (numerical) |
Number field: | \(\Q(\sqrt{-266}) \) |
Galois group: | $C_2$ |
Jacobians: | $20$ |
This isogeny class is simple and geometrically simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.
Newton polygon
This isogeny class is ordinary.
$p$-rank: | $1$ |
Slopes: | $[0, 1]$ |
Point counts
Point counts of the abelian variety
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $462$ | $241164$ | $118387962$ | $58120524000$ | $28536949666302$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $462$ | $241164$ | $118387962$ | $58120524000$ | $28536949666302$ | $14011639368379884$ | $6879714954101354442$ | $3377940044623196976000$ | $1658568561962877299122542$ | $814357163924299100301153804$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 20 curves (of which all are hyperelliptic), and hence is principally polarizable:
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{491}$.
Endomorphism algebra over $\F_{491}$The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-266}) \). |
Base change
This is a primitive isogeny class.
Twists
Below is a list of all twists of this isogeny class.
Twist | Extension degree | Common base change |
---|---|---|
1.491.be | $2$ | (not in LMFDB) |