Properties

Label 2.47.a_be
Base field $\F_{47}$
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:  $\F_{47}$
Dimension:  $2$
L-polynomial:  $( 1 - 8 x + 47 x^{2} )( 1 + 8 x + 47 x^{2} )$
  $1 + 30 x^{2} + 2209 x^{4}$
Frobenius angles:  $\pm0.301698511018$, $\pm0.698301488982$
Angle rank:  $1$ (numerical)
Jacobians:  $279$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2240$ $5017600$ $10779043520$ $23845642240000$ $52599132693867200$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $48$ $2270$ $103824$ $4886718$ $229345008$ $10778871710$ $506623120464$ $23811281427838$ $1119130473102768$ $52599133151904350$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 279 curves (of which all are hyperelliptic):

  • $y^2=43 x^6+38 x^5+21 x^4+7 x^3+44 x^2+8 x+46$
  • $y^2=27 x^6+2 x^5+11 x^4+35 x^3+32 x^2+40 x+42$
  • $y^2=22 x^6+43 x^5+20 x^4+20 x^3+16 x^2+20 x+6$
  • $y^2=16 x^6+17 x^5+29 x^4+34 x^3+29 x^2+17 x+16$
  • $y^2=33 x^6+38 x^5+4 x^4+29 x^3+4 x^2+38 x+33$
  • $y^2=10 x^6+33 x^5+6 x^4+25 x^3+28 x^2+45 x+38$
  • $y^2=3 x^6+24 x^5+30 x^4+31 x^3+46 x^2+37 x+2$
  • $y^2=17 x^6+34 x^5+9 x^4+46 x^3+12 x^2+42 x+39$
  • $y^2=38 x^6+29 x^5+45 x^4+42 x^3+13 x^2+22 x+7$
  • $y^2=16 x^6+45 x^5+30 x^4+38 x^3+13 x^2+14 x+9$
  • $y^2=33 x^6+37 x^5+9 x^4+2 x^3+18 x^2+23 x+45$
  • $y^2=12 x^6+28 x^5+2 x^4+11 x^3+19 x^2+12 x+28$
  • $y^2=13 x^6+46 x^5+10 x^4+8 x^3+x^2+13 x+46$
  • $y^2=17 x^6+38 x^4+2 x^2+10$
  • $y^2=32 x^6+39 x^4+7 x^2+5$
  • $y^2=34 x^6+46 x^5+26 x^4+26 x^3+25 x^2+13 x+2$
  • $y^2=29 x^6+42 x^5+36 x^4+36 x^3+31 x^2+18 x+10$
  • $y^2=20 x^6+15 x^5+22 x^4+45 x^3+41 x^2+5 x+11$
  • $y^2=6 x^6+28 x^5+16 x^4+37 x^3+17 x^2+25 x+8$
  • $y^2=18 x^6+45 x^5+23 x^4+22 x^3+29 x^2+7 x+42$
  • and 259 more

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{47}$
The isogeny class factors as 1.47.ai $\times$ 1.47.i and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:
Endomorphism algebra over $\overline{\F}_{47}$
The base change of $A$ to $\F_{47^{2}}$ is 1.2209.be 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-31}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.47.aq_gc$2$(not in LMFDB)
2.47.q_gc$2$(not in LMFDB)
2.47.a_abe$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.47.aq_gc$2$(not in LMFDB)
2.47.q_gc$2$(not in LMFDB)
2.47.a_abe$4$(not in LMFDB)
2.47.ai_r$6$(not in LMFDB)
2.47.i_r$6$(not in LMFDB)