Abelian variety isogeny class 2.17.f_bk over $\F_{17}$

• Label: 2.17.f_bk
• Base field: $\F_{17}$
• Dimension: $2$
• $p$-rank: $2$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: yes
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{17}$
Dimension:	$2$
L-polynomial:	$1 + 5 x + 36 x^{2} + 85 x^{3} + 289 x^{4}$
Frobenius angles:	$\pm0.516932371821$, $\pm0.686581827611$
Angle rank:	$2$ (numerical)
Number field:	4.0.57800.1
Galois group:	$D_{4}$
Jacobians:	$14$

This isogeny class is simple and 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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$416$	$98176$	$23364224$	$6962249216$	$2017594392736$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$23$	$337$	$4754$	$83361$	$1420983$	$24137758$	$410357159$	$6975609153$	$118587611378$	$2015998938897$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 14 curves (of which all are hyperelliptic):

• $y^2=3 x^6+15 x^5+14 x^4+16 x^3+x^2+5 x+16$
• $y^2=2 x^6+15 x^5+5 x^4+9 x^3+9 x^2+11 x+8$
• $y^2=x^6+x^5+12 x^4+8 x^3+10 x^2+10 x+11$
• $y^2=12 x^5+4 x^4+2 x^3+6 x^2+12 x$
• $y^2=13 x^6+11 x^5+4 x^4+8 x^3+10 x^2+8 x+8$
• $y^2=15 x^6+2 x^5+3 x^4+8 x^3+16 x^2+8 x+12$
• $y^2=4 x^6+10 x^5+12 x^4+15 x^3+4 x^2+x+3$
• $y^2=9 x^6+16 x^5+16 x^4+11 x^2+7 x+5$
• $y^2=13 x^6+14 x^5+10 x^4+11 x^3+9 x^2+6 x+6$
• $y^2=8 x^6+14 x^5+5 x^4+13 x^3+14 x^2+6 x+8$
• $y^2=14 x^6+3 x^5+9 x^4+11 x^3+4 x^2+5 x+9$
• $y^2=7 x^5+x^4+6 x^3+4 x$
• $y^2=6 x^6+13 x^5+6 x^4+11 x^3+13 x^2+16 x+2$
• $y^2=14 x^6+6 x^5+3 x^4+14 x^3+12 x^2+13 x+4$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{17}$.

Endomorphism algebra over $\F_{17}$

The endomorphism algebra of this simple isogeny class is 4.0.57800.1.

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
2.17.af_bk	$2$	(not in LMFDB)