Abelian variety isogeny class 1.263.af over $\F_{263}$

• Label: 1.263.af
• Base field: $\F_{263}$
• 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:	$\F_{263}$
Dimension:	$1$
L-polynomial:	$1 - 5 x + 263 x^{2}$
Frobenius angles:	$\pm0.450733970350$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-1027}) \)
Galois group:	$C_2$
Jacobians:	$4$

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$259$	$69671$	$18195268$	$4784237899$	$1258282629569$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$259$	$69671$	$18195268$	$4784237899$	$1258282629569$	$330928765744304$	$87034260181181663$	$22890010287416764275$	$6020072706259555857004$	$1583279121786489470031311$

Jacobians and polarizations

This isogeny class contains the Jacobians of 4 curves (of which all are hyperelliptic), and hence is principally polarizable:

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{263}$.

Endomorphism algebra over $\F_{263}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-1027}) \).

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
1.263.f	$2$	(not in LMFDB)