Properties

Label 2.59.a_u
Base field $\F_{59}$
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:  $\F_{59}$
Dimension:  $2$
L-polynomial:  $1 + 20 x^{2} + 3481 x^{4}$
Frobenius angles:  $\pm0.277106268321$, $\pm0.722893731679$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{2}, \sqrt{-69})\)
Galois group:  $C_2^2$
Jacobians:  $196$
Isomorphism classes:  288
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $3502$ $12264004$ $42180332782$ $146989533157776$ $511116754376337502$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $60$ $3522$ $205380$ $12130486$ $714924300$ $42180131922$ $2488651484820$ $146830399954078$ $8662995818654940$ $511116755452033602$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 196 curves (of which all are hyperelliptic):

  • $y^2=40 x^5+55 x^4+28 x^2+39 x+27$
  • $y^2=21 x^5+51 x^4+56 x^2+19 x+54$
  • $y^2=34 x^6+7 x^5+30 x^4+x^2+31 x+36$
  • $y^2=18 x^6+42 x^5+41 x^4+16 x^3+31 x^2+29 x+29$
  • $y^2=36 x^6+25 x^5+23 x^4+32 x^3+3 x^2+58 x+58$
  • $y^2=41 x^6+42 x^5+20 x^4+32 x^3+9 x^2+2 x+44$
  • $y^2=23 x^6+25 x^5+40 x^4+5 x^3+18 x^2+4 x+29$
  • $y^2=21 x^6+26 x^5+50 x^4+23 x^3+54 x^2+58 x+26$
  • $y^2=42 x^6+52 x^5+41 x^4+46 x^3+49 x^2+57 x+52$
  • $y^2=20 x^6+11 x^5+48 x^4+45 x^3+24 x^2+12 x+17$
  • $y^2=40 x^6+22 x^5+37 x^4+31 x^3+48 x^2+24 x+34$
  • $y^2=8 x^6+28 x^5+26 x^4+14 x^3+28 x^2+3 x+17$
  • $y^2=16 x^6+56 x^5+52 x^4+28 x^3+56 x^2+6 x+34$
  • $y^2=54 x^6+41 x^5+11 x^4+50 x^3+6 x^2+2 x+55$
  • $y^2=49 x^6+23 x^5+22 x^4+41 x^3+12 x^2+4 x+51$
  • $y^2=52 x^6+45 x^5+34 x^4+23 x^3+20 x^2+16 x+2$
  • $y^2=45 x^6+31 x^5+9 x^4+46 x^3+40 x^2+32 x+4$
  • $y^2=29 x^6+54 x^5+18 x^4+42 x^3+50 x^2+3 x+26$
  • $y^2=58 x^6+49 x^5+36 x^4+25 x^3+41 x^2+6 x+52$
  • $y^2=54 x^6+x^5+34 x^4+35 x^3+29 x^2+30 x+11$
  • and 176 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{59^{2}}$.

Endomorphism algebra over $\F_{59}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{2}, \sqrt{-69})\).
Endomorphism algebra over $\overline{\F}_{59}$
The base change of $A$ to $\F_{59^{2}}$ is 1.3481.u 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-69}) \)$)$

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.59.a_au$4$(not in LMFDB)
2.59.ao_du$8$(not in LMFDB)
2.59.o_du$8$(not in LMFDB)