Properties

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

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Invariants

Base field:  $\F_{89}$
Dimension:  $2$
L-polynomial:  $1 + 14 x + 107 x^{2} + 1246 x^{3} + 7921 x^{4}$
Frobenius angles:  $\pm0.432788543790$, $\pm0.900544789544$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{-3}, \sqrt{-10})\)
Galois group:  $C_2^2$
Jacobians:  $216$
Cyclic group of points:    yes

This isogeny class is simple but not 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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $9289$ $62877241$ $498385169296$ $3935615349656809$ $31181000792287630249$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $104$ $7940$ $706958$ $62726724$ $5583930664$ $496982134766$ $44231340450856$ $3936588921025924$ $350356401467265662$ $31181719935383898500$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 216 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{89^{3}}$.

Endomorphism algebra over $\F_{89}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-3}, \sqrt{-10})\).
Endomorphism algebra over $\overline{\F}_{89}$
The base change of $A$ to $\F_{89^{3}}$ is 1.704969.bmg 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-10}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.89.ao_ed$2$(not in LMFDB)
2.89.abc_ok$3$(not in LMFDB)
2.89.ao_ed$6$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.89.ao_ed$2$(not in LMFDB)
2.89.abc_ok$3$(not in LMFDB)
2.89.ao_ed$6$(not in LMFDB)
2.89.a_as$6$(not in LMFDB)
2.89.bc_ok$6$(not in LMFDB)
2.89.a_s$12$(not in LMFDB)