Properties

Label 2.47.a_ao
Base field $\F_{47}$
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:  $\F_{47}$
Dimension:  $2$
L-polynomial:  $1 - 14 x^{2} + 2209 x^{4}$
Frobenius angles:  $\pm0.226207552479$, $\pm0.773792447521$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{3}, \sqrt{-5})\)
Galois group:  $C_2^2$
Jacobians:  $224$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2196$ $4822416$ $10779305364$ $23852518281216$ $52599131924022036$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $48$ $2182$ $103824$ $4888126$ $229345008$ $10779395398$ $506623120464$ $23811270529918$ $1119130473102768$ $52599131612214022$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 224 curves (of which all are hyperelliptic):

  • $y^2=x^6+42 x^5+4 x^4+9 x^3+5 x^2+2 x+19$
  • $y^2=5 x^6+22 x^5+20 x^4+45 x^3+25 x^2+10 x+1$
  • $y^2=7 x^6+21 x^5+12 x^4+18 x^3+46 x^2+10$
  • $y^2=35 x^6+11 x^5+13 x^4+43 x^3+42 x^2+3$
  • $y^2=12 x^6+45 x^4+46 x^3+8 x^2+31$
  • $y^2=40 x^6+31 x^5+42 x^4+34 x^3+17 x^2+11 x+42$
  • $y^2=12 x^6+14 x^5+22 x^4+29 x^3+38 x^2+8 x+22$
  • $y^2=26 x^6+5 x^5+37 x^4+37 x^3+15 x^2+12 x+26$
  • $y^2=20 x^6+13 x^5+31 x^4+15 x^3+24 x^2+41 x+3$
  • $y^2=12 x^6+25 x^5+27 x^4+21 x^3+26 x^2+33 x+40$
  • $y^2=13 x^6+31 x^5+41 x^4+11 x^3+36 x^2+24 x+12$
  • $y^2=29 x^6+25 x^5+21 x^4+4 x^3+29 x^2+27 x+36$
  • $y^2=30 x^6+44 x^5+22 x^4+31 x^3+4 x^2+10 x+16$
  • $y^2=41 x^6+23 x^5+25 x^4+17 x^3+29 x^2+22 x+28$
  • $y^2=41 x^6+45 x^5+30 x^4+33 x^3+2 x^2+10 x+28$
  • $y^2=17 x^6+37 x^5+9 x^4+24 x^3+10 x^2+3 x+46$
  • $y^2=43 x^6+37 x^5+30 x^4+34 x^3+30 x^2+42 x+5$
  • $y^2=27 x^6+44 x^5+9 x^4+29 x^3+9 x^2+22 x+25$
  • $y^2=20 x^6+38 x^5+38 x^4+32 x^3+19 x^2+7 x+29$
  • $y^2=x^6+x^3+19$
  • and 204 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{47^{2}}$.

Endomorphism algebra over $\F_{47}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{3}, \sqrt{-5})\).
Endomorphism algebra over $\overline{\F}_{47}$
The base change of $A$ to $\F_{47^{2}}$ is 1.2209.ao 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-15}) \)$)$

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.47.a_o$4$(not in LMFDB)
2.47.as_fz$12$(not in LMFDB)
2.47.s_fz$12$(not in LMFDB)