Properties

Label 2.89.e_fa
Base field $\F_{89}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple yes
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{89}$
Dimension:  $2$
L-polynomial:  $1 + 4 x + 130 x^{2} + 356 x^{3} + 7921 x^{4}$
Frobenius angles:  $\pm0.410928795941$, $\pm0.662341766495$
Angle rank:  $2$ (numerical)
Number field:  4.0.15069392.1
Galois group:  $D_{4}$
Jacobians:  $462$

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:  $2$
Slopes:  $[0, 0, 1, 1]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $8412$ $64705104$ $496678876668$ $3936604692713472$ $31181363018118107772$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $94$ $8166$ $704542$ $62742494$ $5583995534$ $496979733510$ $44231352734894$ $3936588957571390$ $350356401841622206$ $31181719923672389286$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 462 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{89}$.

Endomorphism algebra over $\F_{89}$
The endomorphism algebra of this simple isogeny class is 4.0.15069392.1.

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.89.ae_fa$2$(not in LMFDB)