Abelian variety isogeny class 1.61.o over $\F_{61}$

• Label: 1.61.o
• Base field: $\F_{61}$
• 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:	$\F_{61}$
Dimension:	$1$
L-polynomial:	$1 + 14 x + 61 x^{2}$
Frobenius angles:	$\pm0.853724980602$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-3}) \)
Galois group:	$C_2$
Jacobians:	$4$
Isomorphism classes:	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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$76$	$3648$	$227164$	$13847808$	$844557676$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$76$	$3648$	$227164$	$13847808$	$844557676$	$51520795200$	$3142739300476$	$191707336823808$	$11694145974931084$	$713342911860107328$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 4 curves (of which 0 are hyperelliptic):

• $y^2=x^3+8$
• $y^2=x^3+41 x+41$
• $y^2=x^3+20 x+40$
• $y^2=x^3+28 x+56$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{61}$.

Endomorphism algebra over $\F_{61}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-3}) \).

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

Twist	Extension degree	Common base change
1.61.ao	$2$	(not in LMFDB)
1.61.an	$3$	(not in LMFDB)
1.61.ab	$3$	(not in LMFDB)