Invariants
Base field: | $\F_{491}$ |
Dimension: | $1$ |
L-polynomial: | $1 - x + 491 x^{2}$ |
Frobenius angles: | $\pm0.492816828308$ |
Angle rank: | $1$ (numerical) |
Number field: | \(\Q(\sqrt{-1963}) \) |
Galois group: | $C_2$ |
Jacobians: | $6$ |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $491$ | $242063$ | $118372244$ | $58119568363$ | $28536942640501$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $491$ | $242063$ | $118372244$ | $58119568363$ | $28536942640501$ | $14011639661709200$ | $6879714959548234231$ | $3377940044618647188243$ | $1658568561963382566005324$ | $814357163924331558792167903$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 6 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 \(\Q(\sqrt{-1963}) \). |
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.b | $2$ | (not in LMFDB) |