Properties

Label 2.89.g_ec
Base field $\F_{89}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
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:  $( 1 - 6 x + 89 x^{2} )( 1 + 12 x + 89 x^{2} )$
  $1 + 6 x + 106 x^{2} + 534 x^{3} + 7921 x^{4}$
Frobenius angles:  $\pm0.396989011311$, $\pm0.719411653755$
Angle rank:  $2$ (numerical)
Jacobians:  $816$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

This isogeny class is not 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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $8568$ $64157184$ $496917207864$ $3937239128309760$ $31180635780354011448$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $96$ $8098$ $704880$ $62752606$ $5583865296$ $496980011266$ $44231358332544$ $3936588822312766$ $350356403344749120$ $31181719928002974178$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 816 curves (of which all are hyperelliptic):

  • $y^2=6 x^6+72 x^5+37 x^4+14 x^3+29 x^2+41 x+17$
  • $y^2=30 x^6+84 x^5+76 x^4+79 x^3+27 x^2+81 x+71$
  • $y^2=62 x^6+65 x^5+46 x^4+69 x^3+84 x^2+45 x+31$
  • $y^2=88 x^6+63 x^5+19 x^4+43 x^3+26 x^2+61 x+10$
  • $y^2=17 x^6+17 x^5+53 x^4+83 x^3+53 x^2+17 x+17$
  • $y^2=88 x^6+79 x^5+46 x^4+9 x^3+6 x^2+25 x+84$
  • $y^2=77 x^6+48 x^5+17 x^4+12 x^3+25 x^2+73 x+33$
  • $y^2=38 x^6+15 x^5+31 x^4+68 x^3+16 x^2+79 x+50$
  • $y^2=36 x^6+33 x^5+12 x^4+4 x^3+83 x^2+79 x+35$
  • $y^2=81 x^6+13 x^5+62 x^4+39 x^3+75 x^2+75 x+84$
  • $y^2=75 x^6+33 x^5+73 x^4+62 x^3+43 x^2+82 x+84$
  • $y^2=22 x^6+39 x^4+52 x^3+75 x^2+13 x+70$
  • $y^2=15 x^6+17 x^5+80 x^4+80 x^2+17 x+15$
  • $y^2=83 x^6+20 x^5+8 x^4+53 x^3+69 x^2+61 x+13$
  • $y^2=25 x^6+46 x^5+4 x^4+88 x^3+72 x^2+17 x+3$
  • $y^2=x^6+42 x^5+63 x^4+43 x^3+57 x^2+69 x+45$
  • $y^2=12 x^6+46 x^5+44 x^4+46 x^3+18 x^2+74 x+67$
  • $y^2=6 x^6+34 x^5+x^4+54 x^3+42 x^2+70 x+6$
  • $y^2=8 x^6+76 x^5+62 x^4+57 x^3+11 x^2+15 x+26$
  • $y^2=81 x^6+3 x^5+60 x^4+42 x^3+51 x^2+77 x+38$
  • and 796 more

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{89}$
The isogeny class factors as 1.89.ag $\times$ 1.89.m and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

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.as_jq$2$(not in LMFDB)
2.89.ag_ec$2$(not in LMFDB)
2.89.s_jq$2$(not in LMFDB)