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

• Label: 2.61.an_fo
• Base field: $\F_{61}$
• Dimension: $2$
• $p$-rank: $2$
• Ordinary: yes
• Supersingular: no
• Simple: no
• Geometrically simple: no
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{61}$
Dimension:	$2$
L-polynomial:	$( 1 - 11 x + 61 x^{2} )( 1 - 2 x + 61 x^{2} )$
	$1 - 13 x + 144 x^{2} - 793 x^{3} + 3721 x^{4}$
Frobenius angles:	$\pm0.251304563322$, $\pm0.459132412189$
Angle rank:	$2$ (numerical)
Jacobians:	$96$

This isogeny class is not 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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$3060$	$14296320$	$51757133760$	$191720570618880$	$713347512467386500$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$49$	$3841$	$228022$	$13846801$	$844601749$	$51520688998$	$3142743032569$	$191707270995841$	$11694145747750702$	$713342912210106601$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 96 curves (of which all are hyperelliptic):

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

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

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{61}$

The isogeny class factors as 1.61.al $\times$ 1.61.ac and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

• 1.61.al : \(\Q(\sqrt{-123}) \).
• 1.61.ac : \(\Q(\sqrt{-15}) \).

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.aj_dw	$2$	(not in LMFDB)
2.61.j_dw	$2$	(not in LMFDB)
2.61.n_fo	$2$	(not in LMFDB)