Abelian variety isogeny class 1.409.abj over $\F_{409}$

• Label: 1.409.abj
• Base field: $\F_{409}$
• Dimension: $1$
• $p$-rank: $1$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: yes
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{409}$
Dimension:	$1$
L-polynomial:	$1 - 35 x + 409 x^{2}$
Frobenius angles:	$\pm0.167115632457$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-411}) \)
Galois group:	$C_2$
Jacobians:	$6$
Isomorphism classes:	6

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:	$1$
Slopes:	$[0, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$375$	$166875$	$68418000$	$27983101875$	$11445025464375$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$375$	$166875$	$68418000$	$27983101875$	$11445025464375$	$4681013145480000$	$1914534322920261375$	$783044537127254491875$	$320265215673812105634000$	$130988473210583304006046875$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 6 curves (of which 0 are hyperelliptic):

• $y^2=x^3+26 x+26$
• $y^2=x^3+310 x+125$
• $y^2=x^3+298 x+298$
• $y^2=x^3+309 x+309$
• $y^2=x^3+277 x+303$
• $y^2=x^3+247 x+247$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{409}$.

Endomorphism algebra over $\F_{409}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-411}) \).

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
1.409.bj	$2$	(not in LMFDB)