Properties

Label 2.47.a_aby
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:  $( 1 - 12 x + 47 x^{2} )( 1 + 12 x + 47 x^{2} )$
  $1 - 50 x^{2} + 2209 x^{4}$
Frobenius angles:  $\pm0.160736311100$, $\pm0.839263688900$
Angle rank:  $1$ (numerical)
Jacobians:  $227$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2160$ $4665600$ $10779421680$ $23830018560000$ $52599132084034800$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $48$ $2110$ $103824$ $4883518$ $229345008$ $10779628030$ $506623120464$ $23811298823038$ $1119130473102768$ $52599131932239550$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 227 curves (of which all are hyperelliptic):

  • $y^2=40 x^6+9 x^5+4 x^4+4 x^3+11 x^2+24 x+27$
  • $y^2=31 x^6+13 x^4+36 x^3+45 x^2+30 x+1$
  • $y^2=14 x^6+18 x^4+39 x^3+37 x^2+9 x+5$
  • $y^2=31 x^6+43 x^5+28 x^4+39 x^3+34 x^2+31 x+22$
  • $y^2=44 x^6+33 x^5+41 x^4+45 x^3+25 x^2+14 x+7$
  • $y^2=5 x^6+34 x^5+12 x^4+33 x^3+36 x^2+42 x+44$
  • $y^2=25 x^6+29 x^5+13 x^4+24 x^3+39 x^2+22 x+32$
  • $y^2=20 x^6+39 x^5+13 x^4+45 x^3+17 x^2+9 x+16$
  • $y^2=34 x^6+41 x^5+42 x^4+22 x^3+35 x^2+27 x+11$
  • $y^2=29 x^6+17 x^5+22 x^4+16 x^3+34 x^2+41 x+8$
  • $y^2=9 x^5+18 x^4+16 x^3+26 x^2+17 x+20$
  • $y^2=45 x^5+43 x^4+33 x^3+36 x^2+38 x+6$
  • $y^2=17 x^6+24 x^5+26 x^4+14 x^3+21 x^2+12 x+10$
  • $y^2=38 x^6+26 x^5+36 x^4+23 x^3+11 x^2+13 x+3$
  • $y^2=24 x^6+20 x^5+46 x^4+30 x^3+42 x^2+30 x+39$
  • $y^2=12 x^6+4 x^5+25 x^4+30 x^3+45 x^2+5 x+35$
  • $y^2=13 x^6+20 x^5+31 x^4+9 x^3+37 x^2+25 x+34$
  • $y^2=29 x^6+28 x^5+38 x^4+13 x^3+5 x^2+27 x+37$
  • $y^2=4 x^6+46 x^5+2 x^4+18 x^3+25 x^2+41 x+44$
  • $y^2=43 x^5+5 x^4+18 x^3+x^2+18$
  • and 207 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.am $\times$ 1.47.m 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.aby 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-11}) \)$)$

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.ay_je$2$(not in LMFDB)
2.47.y_je$2$(not in LMFDB)
2.47.a_by$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.47.ay_je$2$(not in LMFDB)
2.47.y_je$2$(not in LMFDB)
2.47.a_by$4$(not in LMFDB)
2.47.am_dt$6$(not in LMFDB)
2.47.m_dt$6$(not in LMFDB)