Properties

Label 2.61.ak_dy
Base field $\F_{61}$
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:  $\F_{61}$
Dimension:  $2$
L-polynomial:  $1 - 10 x + 102 x^{2} - 610 x^{3} + 3721 x^{4}$
Frobenius angles:  $\pm0.230274281960$, $\pm0.534879027157$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-174 +30 \sqrt{5}})\)
Galois group:  $D_{4}$
Jacobians:  $336$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $3204$ $14238576$ $51572868804$ $191713882694400$ $713412129583493604$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $52$ $3826$ $227212$ $13846318$ $844678252$ $51520898626$ $3142739154292$ $191707270923358$ $11694146062496452$ $713342911454404306$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 336 curves (of which all are hyperelliptic):

  • $y^2=52 x^6+43 x^5+59 x^4+18 x^3+22 x^2+30 x+9$
  • $y^2=34 x^6+54 x^5+19 x^4+x^3+42 x^2+54 x+57$
  • $y^2=25 x^6+34 x^5+6 x^4+46 x^3+24 x^2+36 x+36$
  • $y^2=40 x^6+20 x^5+34 x^4+46 x^3+26 x^2+25 x+3$
  • $y^2=52 x^6+47 x^5+24 x^4+25 x^3+19 x^2+13 x+23$
  • $y^2=12 x^6+17 x^5+54 x^4+6 x^3+21 x^2+15 x+4$
  • $y^2=30 x^6+17 x^5+52 x^3+36 x^2+24 x+23$
  • $y^2=7 x^6+52 x^5+4 x^4+14 x^3+12 x^2+50 x+30$
  • $y^2=12 x^6+x^5+54 x^4+40 x^3+34 x^2+5 x+48$
  • $y^2=33 x^6+18 x^5+5 x^4+2 x^3+45 x^2+12 x$
  • $y^2=59 x^6+11 x^5+18 x^4+20 x^3+15 x^2+27 x+31$
  • $y^2=32 x^6+44 x^5+x^4+48 x^3+29 x^2+21 x+8$
  • $y^2=48 x^6+24 x^5+3 x^4+59 x^3+10 x^2+41 x+37$
  • $y^2=17 x^6+23 x^5+55 x^4+15 x^3+24 x^2+30 x+22$
  • $y^2=59 x^6+7 x^5+39 x^4+19 x^3+31 x^2+58 x+7$
  • $y^2=4 x^6+53 x^5+60 x^4+40 x^3+2 x^2+24 x+28$
  • $y^2=36 x^6+33 x^5+32 x^4+28 x^3+47 x^2+13 x+60$
  • $y^2=60 x^5+31 x^4+25 x^3+60 x^2+41 x+53$
  • $y^2=15 x^6+26 x^5+12 x^4+13 x^3+22 x^2+26 x$
  • $y^2=19 x^6+14 x^5+14 x^4+48 x^3+3 x^2+3 x+37$
  • and 316 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{61}$.

Endomorphism algebra over $\F_{61}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-174 +30 \sqrt{5}})\).

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.61.k_dy$2$(not in LMFDB)