Abelian variety isogeny class 2.47.a_v over $\F_{47}$

• Label: 2.47.a_v
• 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

Invariants

Base field:	$\F_{47}$
Dimension:	$2$
L-polynomial:	$1 + 21 x^{2} + 2209 x^{4}$
Frobenius angles:	$\pm0.285858501013$, $\pm0.714141498987$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{73}, \sqrt{-115})\)
Galois group:	$C_2^2$
Jacobians:	$42$
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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$2231$	$4977361$	$10779085424$	$23850125228281$	$52599132649992911$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$48$	$2252$	$103824$	$4887636$	$229345008$	$10778955518$	$506623120464$	$23811274547428$	$1119130473102768$	$52599133064155772$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 42 curves (of which all are hyperelliptic):

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

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

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 \(\Q(\sqrt{73}, \sqrt{-115})\).

Endomorphism algebra over $\overline{\F}_{47}$

The base change of $A$ to $\F_{47^{2}}$ is 1.2209.v^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-8395}) \)$)$

Base change

This is a primitive isogeny class.

Twists

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

Twist	Extension degree	Common base change
2.47.a_av	$4$	(not in LMFDB)