Abelian variety isogeny class 2.61.a_abf over $\F_{61}$

• Label: 2.61.a_abf
• Base field: $\F_{61}$
• 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:	$\F_{61}$
Dimension:	$2$
L-polynomial:	$1 - 31 x^{2} + 3721 x^{4}$
Frobenius angles:	$\pm0.209110651770$, $\pm0.790889348230$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{17}, \sqrt{-91})\)
Galois group:	$C_2^2$
Jacobians:	$126$
Isomorphism classes:	144
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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$3691$	$13623481$	$51520690624$	$191886852496329$	$713342910042409651$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$62$	$3660$	$226982$	$13858804$	$844596302$	$51521006886$	$3142742836022$	$191707284373924$	$11694146092834142$	$713342908421936700$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 126 curves (of which all are hyperelliptic):

• $y^2=24 x^6+14 x^5+x^4+38 x^3+21 x^2+19 x+21$
• $y^2=48 x^6+28 x^5+2 x^4+15 x^3+42 x^2+38 x+42$
• $y^2=15 x^6+37 x^5+17 x^4+58 x^3+52 x^2+19 x+5$
• $y^2=30 x^6+13 x^5+34 x^4+55 x^3+43 x^2+38 x+10$
• $y^2=5 x^6+16 x^5+8 x^4+60 x^3+17 x^2+43 x+58$
• $y^2=10 x^6+32 x^5+16 x^4+59 x^3+34 x^2+25 x+55$
• $y^2=60 x^6+13 x^5+48 x^4+35 x^3+46 x^2+7 x+39$
• $y^2=53 x^6+34 x^5+46 x^4+31 x^3+40 x^2+14 x+60$
• $y^2=45 x^6+7 x^5+31 x^4+x^3+19 x^2+28 x+59$
• $y^2=48 x^6+47 x^5+6 x^4+32 x^3+3 x^2+28 x+10$
• $y^2=11 x^6+11 x^5+31 x^4+6 x^3+28 x^2+26 x+60$
• $y^2=22 x^6+22 x^5+x^4+12 x^3+56 x^2+52 x+59$
• $y^2=46 x^6+32 x^5+55 x^4+56 x^3+32 x^2+56 x+48$
• $y^2=31 x^6+3 x^5+49 x^4+51 x^3+3 x^2+51 x+35$
• $y^2=52 x^6+21 x^5+9 x^4+41 x^2+29 x+1$
• $y^2=43 x^6+42 x^5+18 x^4+21 x^2+58 x+2$
• $y^2=4 x^6+28 x^5+14 x^4+13 x^3+45 x^2+42 x+34$
• $y^2=60 x^6+55 x^5+25 x^4+33 x^3+49 x^2+12 x+23$
• $y^2=59 x^6+49 x^5+50 x^4+5 x^3+37 x^2+24 x+46$
• $y^2=14 x^6+9 x^5+52 x^4+2 x^3+19 x^2+12 x+43$
• and

• $y^2=28 x^6+18 x^5+43 x^4+4 x^3+38 x^2+24 x+25$
• $y^2=6 x^6+53 x^5+48 x^4+24 x^3+27 x^2+19 x+18$
• $y^2=12 x^6+45 x^5+35 x^4+48 x^3+54 x^2+38 x+36$
• $y^2=31 x^6+41 x^5+43 x^4+38 x^3+39 x^2+60 x+31$
• $y^2=x^6+21 x^5+25 x^4+15 x^3+17 x^2+59 x+1$
• $y^2=10 x^6+34 x^5+6 x^4+21 x^3+53 x^2+13 x+33$
• $y^2=23 x^6+5 x^5+38 x^3+56 x^2+51 x+53$
• $y^2=34 x^6+39 x^5+28 x^4+38 x^3+57 x^2+22 x+39$
• $y^2=7 x^6+17 x^5+56 x^4+15 x^3+53 x^2+44 x+17$
• $y^2=41 x^6+34 x^5+46 x^4+18 x^3+24 x^2+29 x+15$
• $y^2=25 x^6+10 x^5+57 x^4+51 x^3+44 x^2+12 x+20$
• $y^2=21 x^6+5 x^5+51 x^4+8 x^3+42 x^2+25 x+2$
• $y^2=42 x^6+10 x^5+41 x^4+16 x^3+23 x^2+50 x+4$
• $y^2=55 x^6+59 x^5+41 x^4+11 x^3+16 x^2+22 x+19$
• $y^2=49 x^6+57 x^5+21 x^4+22 x^3+32 x^2+44 x+38$
• $y^2=11 x^6+6 x^5+59 x^4+33 x^3+41 x^2+x+52$
• $y^2=22 x^6+12 x^5+57 x^4+5 x^3+21 x^2+2 x+43$
• $y^2=59 x^6+19 x^5+54 x^4+41 x^3+17 x^2+57 x+5$
• $y^2=57 x^6+38 x^5+47 x^4+21 x^3+34 x^2+53 x+10$
• $y^2=46 x^6+4 x^5+55 x^4+38 x^3+55 x^2+58 x+20$
• $y^2=31 x^6+8 x^5+49 x^4+15 x^3+49 x^2+55 x+40$
• $y^2=25 x^6+19 x^5+4 x^4+11 x^3+36 x^2+4 x+15$
• $y^2=50 x^6+38 x^5+8 x^4+22 x^3+11 x^2+8 x+30$
• $y^2=50 x^6+52 x^5+50 x^4+58 x^3+8 x^2+29 x+46$
• $y^2=39 x^6+43 x^5+39 x^4+55 x^3+16 x^2+58 x+31$
• $y^2=2 x^6+52 x^5+38 x^4+22 x^3+57 x^2+57 x+58$
• $y^2=58 x^6+2 x^5+15 x^4+28 x^3+7 x^2+32 x+24$
• $y^2=55 x^6+4 x^5+30 x^4+56 x^3+14 x^2+3 x+48$
• $y^2=57 x^6+10 x^5+29 x^4+13 x^3+x^2+45 x+9$
• $y^2=27 x^6+25 x^5+19 x^4+12 x^3+51 x^2+38 x+45$
• $y^2=54 x^6+50 x^5+38 x^4+24 x^3+41 x^2+15 x+29$
• $y^2=35 x^6+43 x^5+8 x^4+4 x^3+41 x^2+24 x+24$
• $y^2=9 x^6+25 x^5+16 x^4+8 x^3+21 x^2+48 x+48$
• $y^2=26 x^6+25 x^5+20 x^4+41 x^3+10 x^2+21 x+2$
• $y^2=40 x^6+38 x^5+5 x^4+15 x^3+20 x^2+42 x+48$
• $y^2=19 x^6+15 x^5+10 x^4+30 x^3+40 x^2+23 x+35$
• $y^2=41 x^6+32 x^5+15 x^4+27 x^3+9 x^2+60 x+32$
• $y^2=21 x^6+3 x^5+30 x^4+54 x^3+18 x^2+59 x+3$
• $y^2=32 x^6+60 x^5+37 x^4+14 x^3+7 x^2+45 x+40$
• $y^2=51 x^6+2 x^5+15 x^4+13 x^3+20 x^2+51 x+37$
• $y^2=41 x^6+4 x^5+30 x^4+26 x^3+40 x^2+41 x+13$
• $y^2=5 x^6+34 x^5+50 x^4+58 x^3+48 x^2+59 x+27$
• $y^2=30 x^6+56 x^5+22 x^4+32 x^3+24 x^2+46 x+23$
• $y^2=60 x^6+51 x^5+44 x^4+3 x^3+48 x^2+31 x+46$
• $y^2=12 x^6+37 x^5+25 x^4+2 x^3+11 x^2+17 x+17$
• $y^2=24 x^6+13 x^5+50 x^4+4 x^3+22 x^2+34 x+34$
• $y^2=14 x^6+40 x^5+45 x^4+27 x^3+49 x^2+60 x+60$
• $y^2=28 x^6+19 x^5+29 x^4+54 x^3+37 x^2+59 x+59$
• $y^2=28 x^6+52 x^5+36 x^4+27 x^3+26 x^2+5 x+50$
• $y^2=56 x^6+43 x^5+11 x^4+54 x^3+52 x^2+10 x+39$
• $y^2=11 x^6+56 x^5+32 x^4+35 x^3+35 x^2+59 x+38$
• $y^2=22 x^6+51 x^5+3 x^4+9 x^3+9 x^2+57 x+15$
• $y^2=19 x^6+46 x^5+37 x^4+58 x^3+49 x^2+55 x+26$
• $y^2=38 x^6+31 x^5+13 x^4+55 x^3+37 x^2+49 x+52$
• $y^2=38 x^6+8 x^5+46 x^4+8 x^3+x^2+51 x+53$
• $y^2=15 x^6+16 x^5+31 x^4+16 x^3+2 x^2+41 x+45$
• $y^2=37 x^6+16 x^5+49 x^4+40 x^3+4 x^2+44 x+58$
• $y^2=x^6+29 x^5+34 x^4+52 x^3+32 x^2+30 x+51$
• $y^2=2 x^6+58 x^5+7 x^4+43 x^3+3 x^2+60 x+41$
• $y^2=26 x^6+58 x^5+47 x^4+59 x^3+x^2+27 x+39$
• $y^2=52 x^6+55 x^5+33 x^4+57 x^3+2 x^2+54 x+17$
• $y^2=59 x^6+43 x^5+3 x^4+11 x^3+48 x^2+43 x+26$
• $y^2=57 x^6+25 x^5+6 x^4+22 x^3+35 x^2+25 x+52$
• $y^2=22 x^6+40 x^5+55 x^4+2 x^3+50 x^2+41 x+37$
• $y^2=44 x^6+19 x^5+49 x^4+4 x^3+39 x^2+21 x+13$
• $y^2=21 x^6+16 x^5+52 x^4+57 x^3+49 x^2+38 x+6$
• $y^2=42 x^6+32 x^5+43 x^4+53 x^3+37 x^2+15 x+12$
• $y^2=7 x^6+36 x^5+3 x^4+25 x^3+11 x^2+52 x+53$
• $y^2=14 x^6+11 x^5+6 x^4+50 x^3+22 x^2+43 x+45$
• $y^2=42 x^6+17 x^5+29 x^4+44 x^3+43 x^2+55 x+55$
• $y^2=23 x^6+34 x^5+58 x^4+27 x^3+25 x^2+49 x+49$
• $y^2=43 x^6+39 x^5+37 x^4+57 x^3+46 x^2+28 x+24$
• $y^2=57 x^6+41 x^5+55 x^4+27 x^3+24 x+44$
• $y^2=53 x^6+21 x^5+49 x^4+54 x^3+48 x+27$
• $y^2=48 x^6+36 x^5+9 x^4+59 x^3+52 x^2+25 x+51$
• $y^2=35 x^6+11 x^5+18 x^4+57 x^3+43 x^2+50 x+41$
• $y^2=20 x^6+40 x^5+38 x^4+59 x^3+4 x^2+19 x+50$
• $y^2=40 x^6+19 x^5+15 x^4+57 x^3+8 x^2+38 x+39$
• $y^2=27 x^6+47 x^5+44 x^4+47 x^3+24 x^2+40 x+17$
• $y^2=31 x^6+53 x^5+39 x^4+42 x^3+56 x^2+56 x+52$
• $y^2=x^6+45 x^5+17 x^4+23 x^3+51 x^2+51 x+43$
• $y^2=12 x^6+41 x^5+55 x^4+42 x^3+15 x^2+60 x+34$
• $y^2=24 x^6+21 x^5+49 x^4+23 x^3+30 x^2+59 x+7$
• $y^2=12 x^6+58 x^5+47 x^4+41 x^3+57 x^2+55 x+1$
• $y^2=24 x^6+55 x^5+33 x^4+21 x^3+53 x^2+49 x+2$
• $y^2=46 x^6+27 x^5+48 x^4+2 x^2+45 x+17$
• $y^2=31 x^6+54 x^5+35 x^4+4 x^2+29 x+34$
• $y^2=40 x^6+28 x^5+56 x^3+15 x^2+51 x+51$
• $y^2=19 x^6+56 x^5+51 x^3+30 x^2+41 x+41$
• $y^2=26 x^6+31 x^5+x^4+38 x^3+5 x^2+30 x+1$
• $y^2=52 x^6+x^5+2 x^4+15 x^3+10 x^2+60 x+2$
• $y^2=45 x^6+13 x^5+34 x^4+30 x^3+14 x^2+4 x+52$
• $y^2=29 x^6+26 x^5+7 x^4+60 x^3+28 x^2+8 x+43$
• $y^2=53 x^6+7 x^5+17 x^4+11 x^3+50 x^2+39 x+49$
• $y^2=8 x^6+18 x^5+45 x^4+35 x^3+22 x^2+7 x+13$
• $y^2=42 x^6+32 x^5+23 x^4+5 x^3+36 x^2+4 x+2$
• $y^2=23 x^6+3 x^5+46 x^4+10 x^3+11 x^2+8 x+4$
• $y^2=33 x^6+2 x^5+16 x^4+12 x^3+53 x^2+42 x+18$
• $y^2=5 x^6+4 x^5+32 x^4+24 x^3+45 x^2+23 x+36$
• $y^2=51 x^6+4 x^5+21 x^4+18 x^3+42 x^2+56 x+33$
• $y^2=41 x^6+8 x^5+42 x^4+36 x^3+23 x^2+51 x+5$
• $y^2=27 x^6+21 x^5+51 x^4+6 x^3+34 x^2+39 x+58$
• $y^2=54 x^6+42 x^5+41 x^4+12 x^3+7 x^2+17 x+55$
• $y^2=37 x^6+28 x^5+45 x^4+41 x^3+29 x^2+2 x+3$
• $y^2=45 x^6+44 x^5+2 x^4+48 x^3+48 x^2+22 x+9$
• $y^2=29 x^6+27 x^5+4 x^4+35 x^3+35 x^2+44 x+18$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{61^{2}}$.

Endomorphism algebra over $\F_{61}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{17}, \sqrt{-91})\).

Endomorphism algebra over $\overline{\F}_{61}$

The base change of $A$ to $\F_{61^{2}}$ is 1.3721.abf^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-1547}) \)$)$

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
2.61.a_bf	$4$	(not in LMFDB)