Properties

Label 2.89.a_dw
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:  $1 + 100 x^{2} + 7921 x^{4}$
Frobenius angles:  $\pm0.344945043679$, $\pm0.655054956321$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{78}, \sqrt{-278})\)
Galois group:  $C_2^2$
Jacobians:  $416$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $8022$ $64352484$ $496979914662$ $3937322045671056$ $31181719931732304102$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $90$ $8122$ $704970$ $62753926$ $5584059450$ $496978538362$ $44231334895530$ $3936588988413118$ $350356403707485210$ $31181719933498424602$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 416 curves (of which all are hyperelliptic):

  • $y^2=67 x^6+12 x^5+39 x^4+43 x^3+35 x^2+50 x+34$
  • $y^2=23 x^6+36 x^5+28 x^4+40 x^3+16 x^2+61 x+13$
  • $y^2=64 x^6+6 x^5+62 x^4+45 x^3+34 x^2+87 x+79$
  • $y^2=14 x^6+18 x^5+8 x^4+46 x^3+13 x^2+83 x+59$
  • $y^2=41 x^6+52 x^5+24 x^4+58 x^3+86 x^2+22 x+39$
  • $y^2=34 x^6+67 x^5+72 x^4+85 x^3+80 x^2+66 x+28$
  • $y^2=23 x^6+28 x^5+68 x^4+54 x^3+84 x^2+19 x+40$
  • $y^2=69 x^6+84 x^5+26 x^4+73 x^3+74 x^2+57 x+31$
  • $y^2=43 x^6+20 x^5+12 x^4+27 x^3+88 x^2+2 x+66$
  • $y^2=40 x^6+60 x^5+36 x^4+81 x^3+86 x^2+6 x+20$
  • $y^2=65 x^6+64 x^5+40 x^4+46 x^3+79 x^2+72 x+47$
  • $y^2=17 x^6+14 x^5+31 x^4+49 x^3+59 x^2+38 x+52$
  • $y^2=52 x^6+71 x^5+10 x^4+69 x^3+82 x^2+59 x+74$
  • $y^2=67 x^6+35 x^5+30 x^4+29 x^3+68 x^2+88 x+44$
  • $y^2=70 x^6+64 x^5+17 x^4+79 x^3+9 x^2+5 x+38$
  • $y^2=32 x^6+14 x^5+51 x^4+59 x^3+27 x^2+15 x+25$
  • $y^2=28 x^6+52 x^5+7 x^4+23 x^3+85 x^2+76 x+41$
  • $y^2=84 x^6+67 x^5+21 x^4+69 x^3+77 x^2+50 x+34$
  • $y^2=20 x^6+4 x^5+23 x^4+43 x^3+78 x^2+26 x+14$
  • $y^2=60 x^6+12 x^5+69 x^4+40 x^3+56 x^2+78 x+42$
  • and 396 more

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{89}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{78}, \sqrt{-278})\).
Endomorphism algebra over $\overline{\F}_{89}$
The base change of $A$ to $\F_{89^{2}}$ is 1.7921.dw 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-5421}) \)$)$

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.a_adw$4$(not in LMFDB)