Properties

Label 2.89.a_gw
Base field $\F_{89}$
Dimension $2$
$p$-rank $0$
Ordinary no
Supersingular yes
Simple no
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:  $( 1 + 89 x^{2} )^{2}$
  $1 + 178 x^{2} + 7921 x^{4}$
Frobenius angles:  $\pm0.5$, $\pm0.5$
Angle rank:  $0$ (numerical)
Jacobians:  $209$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3, 5$

This isogeny class is not simple, primitive, not ordinary, and supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is supersingular.

$p$-rank:  $0$
Slopes:  $[1/2, 1/2, 1/2, 1/2]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $8100$ $65610000$ $496982700900$ $3934601256960000$ $31181719941134302500$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $90$ $8278$ $704970$ $62710558$ $5584059450$ $496984110838$ $44231334895530$ $3936588554733118$ $350356403707485210$ $31181719952302421398$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 209 curves (of which all are hyperelliptic):

  • $y^2=x^5+88$
  • $y^2=3 x^5+86$
  • $y^2=11 x^6+9 x^5+74 x^4+50 x^3+31 x^2+46 x+35$
  • $y^2=33 x^6+27 x^5+44 x^4+61 x^3+4 x^2+49 x+16$
  • $y^2=70 x^6+x^5+63 x^4+50 x^3+37 x^2+60 x+50$
  • $y^2=32 x^6+3 x^5+11 x^4+61 x^3+22 x^2+2 x+61$
  • $y^2=67 x^6+44 x^5+67 x^4+27 x^3+74 x^2+x$
  • $y^2=53 x^6+15 x^5+24 x^4+58 x^3+71 x^2+32 x+20$
  • $y^2=70 x^6+45 x^5+72 x^4+85 x^3+35 x^2+7 x+60$
  • $y^2=46 x^6+61 x^5+46 x^4+49 x^2+74 x+85$
  • $y^2=79 x^6+15 x^5+29 x^4+17 x^3+29 x^2+15 x+79$
  • $y^2=59 x^6+45 x^5+87 x^4+51 x^3+87 x^2+45 x+59$
  • $y^2=27 x^6+50 x^5+44 x^4+65 x^3+44 x^2+50 x+27$
  • $y^2=81 x^6+61 x^5+43 x^4+17 x^3+43 x^2+61 x+81$
  • $y^2=2 x^6+39 x^5+74 x^4+38 x^3+80 x^2+5 x+55$
  • $y^2=6 x^6+28 x^5+44 x^4+25 x^3+62 x^2+15 x+76$
  • $y^2=18 x^6+76 x^5+53 x^4+34 x^3+45 x^2+52 x+1$
  • $y^2=54 x^6+50 x^5+70 x^4+13 x^3+46 x^2+67 x+3$
  • $y^2=23 x^6+31 x^5+84 x^4+69 x^3+84 x^2+31 x+23$
  • $y^2=69 x^6+4 x^5+74 x^4+29 x^3+74 x^2+4 x+69$
  • and 189 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{89^{2}}$.

Endomorphism algebra over $\F_{89}$
The isogeny class factors as 1.89.a 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-89}) \)$)$
Endomorphism algebra over $\overline{\F}_{89}$
The base change of $A$ to $\F_{89^{2}}$ is 1.7921.gw 2 and its endomorphism algebra is $\mathrm{M}_{2}(B)$, where $B$ is the quaternion algebra over \(\Q\) ramified at $89$ and $\infty$.

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.a_adl$3$(not in LMFDB)
2.89.a_agw$4$(not in LMFDB)
2.89.a_a$8$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.89.a_adl$3$(not in LMFDB)
2.89.a_agw$4$(not in LMFDB)
2.89.a_a$8$(not in LMFDB)
2.89.a_dl$12$(not in LMFDB)