Abelian variety isogeny class 2.79.a_acb over $\F_{79}$

• Label: 2.79.a_acb
• Base field: $\F_{79}$
• 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:	$\F_{79}$
Dimension:	$2$
L-polynomial:	$1 - 53 x^{2} + 6241 x^{4}$
Frobenius angles:	$\pm0.195556996945$, $\pm0.804443003055$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-105}, \sqrt{211})\)
Galois group:	$C_2^2$
Jacobians:	$112$
Isomorphism classes:	128
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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$6189$	$38303721$	$243088298964$	$1517862509660025$	$9468276076532587029$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$80$	$6136$	$493040$	$38969428$	$3077056400$	$243089142406$	$19203908986160$	$1517108778573028$	$119851595982618320$	$9468276070438326856$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 112 curves (of which all are hyperelliptic):

• $y^2=27 x^6+30 x^5+39 x^4+36 x^3+40 x^2+37 x+20$
• $y^2=22 x^6+39 x^5+72 x^4+58 x^3+40 x^2+14 x+67$
• $y^2=66 x^6+38 x^5+58 x^4+16 x^3+41 x^2+42 x+43$
• $y^2=37 x^6+34 x^5+78 x^3+49 x^2+41 x+12$
• $y^2=32 x^6+23 x^5+76 x^3+68 x^2+44 x+36$
• $y^2=4 x^6+10 x^5+2 x^4+62 x^3+52 x^2+41 x+33$
• $y^2=12 x^6+30 x^5+6 x^4+28 x^3+77 x^2+44 x+20$
• $y^2=53 x^6+16 x^5+59 x^4+12 x^3+47 x^2+13 x+14$
• $y^2=x^6+48 x^5+19 x^4+36 x^3+62 x^2+39 x+42$
• $y^2=64 x^6+63 x^5+40 x^4+61 x^3+57 x^2+34 x+34$
• $y^2=34 x^6+31 x^5+41 x^4+25 x^3+13 x^2+23 x+23$
• $y^2=59 x^6+72 x^5+25 x^4+69 x^3+11 x^2+27 x+23$
• $y^2=19 x^6+58 x^5+75 x^4+49 x^3+33 x^2+2 x+69$
• $y^2=42 x^6+17 x^5+x^4+35 x^3+77 x^2+43 x+71$
• $y^2=47 x^6+51 x^5+3 x^4+26 x^3+73 x^2+50 x+55$
• $y^2=77 x^6+58 x^5+70 x^4+16 x^3+18 x^2+70 x+76$
• $y^2=73 x^6+16 x^5+52 x^4+48 x^3+54 x^2+52 x+70$
• $y^2=17 x^6+60 x^5+22 x^4+51 x^3+59 x^2+19 x+8$
• $y^2=51 x^6+22 x^5+66 x^4+74 x^3+19 x^2+57 x+24$
• $y^2=11 x^6+36 x^5+25 x^4+20 x^3+45 x^2+39 x+34$
• and

• $y^2=33 x^6+29 x^5+75 x^4+60 x^3+56 x^2+38 x+23$
• $y^2=42 x^6+38 x^5+37 x^4+3 x^3+76 x^2+30 x+32$
• $y^2=47 x^6+35 x^5+32 x^4+9 x^3+70 x^2+11 x+17$
• $y^2=17 x^6+29 x^5+3 x^4+7 x^3+60 x^2+41 x+50$
• $y^2=51 x^6+8 x^5+9 x^4+21 x^3+22 x^2+44 x+71$
• $y^2=38 x^6+58 x^5+55 x^4+66 x^3+68 x^2+57 x+23$
• $y^2=35 x^6+16 x^5+7 x^4+40 x^3+46 x^2+13 x+69$
• $y^2=78 x^6+25 x^5+75 x^4+8 x^3+77 x^2+42 x+42$
• $y^2=76 x^6+75 x^5+67 x^4+24 x^3+73 x^2+47 x+47$
• $y^2=31 x^6+60 x^5+63 x^4+15 x^3+37 x^2+22 x+3$
• $y^2=x^6+32 x^5+51 x^4+34 x^3+59 x^2+36 x+35$
• $y^2=3 x^6+17 x^5+74 x^4+23 x^3+19 x^2+29 x+26$
• $y^2=60 x^6+18 x^5+34 x^4+57 x^3+23 x^2+76 x+40$
• $y^2=22 x^6+54 x^5+23 x^4+13 x^3+69 x^2+70 x+41$
• $y^2=33 x^6+75 x^5+42 x^4+46 x^3+14 x^2+52 x+68$
• $y^2=20 x^6+67 x^5+47 x^4+59 x^3+42 x^2+77 x+46$
• $y^2=61 x^6+36 x^5+60 x^4+59 x^3+70 x^2+17 x+25$
• $y^2=25 x^6+29 x^5+22 x^4+19 x^3+52 x^2+51 x+75$
• $y^2=19 x^6+4 x^5+20 x^4+16 x^3+37 x^2+34 x+66$
• $y^2=68 x^6+26 x^5+59 x^4+67 x^3+28 x^2+78 x+13$
• $y^2=46 x^6+78 x^5+19 x^4+43 x^3+5 x^2+76 x+39$
• $y^2=42 x^6+59 x^5+18 x^4+31 x^3+30 x^2+20 x+62$
• $y^2=57 x^6+60 x^5+60 x^4+21 x^3+20 x^2+37 x+56$
• $y^2=7 x^6+76 x^5+26 x^4+71 x^3+67 x^2+77 x+46$
• $y^2=21 x^6+70 x^5+78 x^4+55 x^3+43 x^2+73 x+59$
• $y^2=18 x^6+19 x^5+48 x^4+37 x^3+32 x^2+76 x+67$
• $y^2=54 x^6+57 x^5+65 x^4+32 x^3+17 x^2+70 x+43$
• $y^2=49 x^6+74 x^5+47 x^4+76 x^3+35 x^2+44 x+44$
• $y^2=47 x^6+48 x^5+56 x^4+59 x^3+40 x^2+34 x+72$
• $y^2=62 x^6+65 x^5+10 x^4+19 x^3+41 x^2+23 x+58$
• $y^2=27 x^6+37 x^5+9 x^4+59 x^3+21 x^2+64 x+59$
• $y^2=2 x^6+32 x^5+27 x^4+19 x^3+63 x^2+34 x+19$
• $y^2=58 x^6+4 x^5+60 x^4+42 x^3+73 x^2+70 x+61$
• $y^2=16 x^6+12 x^5+22 x^4+47 x^3+61 x^2+52 x+25$
• $y^2=3 x^6+30 x^5+69 x^4+36 x^3+56 x^2+24 x+72$
• $y^2=9 x^6+11 x^5+49 x^4+29 x^3+10 x^2+72 x+58$
• $y^2=9 x^6+65 x^5+3 x^4+51 x^3+77 x^2+77 x+56$
• $y^2=27 x^6+37 x^5+9 x^4+74 x^3+73 x^2+73 x+10$
• $y^2=5 x^6+33 x^5+10 x^4+31 x^3+17 x^2+67 x+32$
• $y^2=15 x^6+20 x^5+30 x^4+14 x^3+51 x^2+43 x+17$
• $y^2=12 x^6+77 x^5+20 x^4+26 x^2+23 x+13$
• $y^2=36 x^6+73 x^5+60 x^4+78 x^2+69 x+39$
• $y^2=50 x^6+69 x^5+34 x^4+23 x^3+77 x^2+66 x+63$
• $y^2=71 x^6+49 x^5+23 x^4+69 x^3+73 x^2+40 x+31$
• $y^2=19 x^6+46 x^5+69 x^4+26 x^3+74 x^2+9 x+70$
• $y^2=57 x^6+59 x^5+49 x^4+78 x^3+64 x^2+27 x+52$
• $y^2=72 x^6+53 x^5+30 x^4+75 x^3+78 x^2+17 x+27$
• $y^2=59 x^6+60 x^5+5 x^4+75 x^3+21 x^2+x+20$
• $y^2=10 x^6+16 x^5+39 x^4+45 x^3+78 x^2+24 x+1$
• $y^2=30 x^6+48 x^5+38 x^4+56 x^3+76 x^2+72 x+3$
• $y^2=23 x^6+9 x^5+27 x^4+33 x^3+53 x^2+21 x+9$
• $y^2=41 x^6+43 x^4+24 x^3+44 x^2+13 x+24$
• $y^2=44 x^6+50 x^4+72 x^3+53 x^2+39 x+72$
• $y^2=63 x^6+30 x^5+48 x^4+34 x^3+13 x^2+3 x+42$
• $y^2=31 x^6+11 x^5+65 x^4+23 x^3+39 x^2+9 x+47$
• $y^2=33 x^6+9 x^5+75 x^4+11 x^3+20 x^2+55 x+68$
• $y^2=20 x^6+27 x^5+67 x^4+33 x^3+60 x^2+7 x+46$
• $y^2=12 x^6+65 x^5+68 x^4+57 x^3+36 x^2+36 x+26$
• $y^2=36 x^6+37 x^5+46 x^4+13 x^3+29 x^2+29 x+78$
• $y^2=54 x^6+71 x^5+26 x^4+53 x^3+31 x^2+75 x+67$
• $y^2=4 x^6+55 x^5+78 x^4+x^3+14 x^2+67 x+43$
• $y^2=62 x^6+77 x^5+4 x^4+53 x^3+29 x^2+60 x+6$
• $y^2=28 x^6+73 x^5+12 x^4+x^3+8 x^2+22 x+18$
• $y^2=60 x^6+10 x^5+66 x^4+23 x^3+74 x^2+66 x+36$
• $y^2=22 x^6+30 x^5+40 x^4+69 x^3+64 x^2+40 x+29$
• $y^2=75 x^6+50 x^5+55 x^4+9 x^3+45 x^2+62 x+69$
• $y^2=39 x^6+61 x^5+26 x^4+28 x^3+13 x^2+4 x+60$
• $y^2=38 x^6+25 x^5+78 x^4+5 x^3+39 x^2+12 x+22$
• $y^2=2 x^6+45 x^5+21 x^4+59 x^3+42 x^2+78 x+60$
• $y^2=27 x^6+44 x^5+60 x^4+61 x^3+54 x^2+16 x+53$
• $y^2=2 x^6+53 x^5+22 x^4+25 x^3+4 x^2+48 x+1$
• $y^2=64 x^6+23 x^4+11 x^3+50 x^2+40 x+15$
• $y^2=34 x^6+69 x^4+33 x^3+71 x^2+41 x+45$
• $y^2=64 x^6+6 x^5+39 x^4+20 x^3+65 x^2+20 x+12$
• $y^2=2 x^6+53 x^5+31 x^4+74 x^3+33 x^2+75 x+69$
• $y^2=6 x^6+x^5+14 x^4+64 x^3+20 x^2+67 x+49$
• $y^2=64 x^6+53 x^4+22 x^3+4 x^2+48 x+12$
• $y^2=34 x^6+x^4+66 x^3+12 x^2+65 x+36$
• $y^2=30 x^6+39 x^5+18 x^4+22 x^3+6 x^2+38 x+53$
• $y^2=11 x^6+38 x^5+54 x^4+66 x^3+18 x^2+35 x+1$
• $y^2=69 x^6+7 x^5+11 x^4+16 x^3+70 x^2+44 x+57$
• $y^2=49 x^6+21 x^5+33 x^4+48 x^3+52 x^2+53 x+13$
• $y^2=67 x^6+29 x^5+23 x^4+38 x^3+44 x^2+78 x+12$
• $y^2=43 x^6+8 x^5+69 x^4+35 x^3+53 x^2+76 x+36$
• $y^2=7 x^6+64 x^5+32 x^4+69 x^3+23 x^2+13 x+78$
• $y^2=21 x^6+34 x^5+17 x^4+49 x^3+69 x^2+39 x+76$
• $y^2=11 x^6+39 x^5+38 x^4+14 x^3+21 x^2+72 x+76$
• $y^2=68 x^6+11 x^5+3 x^4+19 x^3+21 x^2+17 x+48$
• $y^2=20 x^6+64 x^5+25 x^4+56 x^3+36 x^2+66 x+66$
• $y^2=60 x^6+34 x^5+75 x^4+10 x^3+29 x^2+40 x+40$
• $y^2=60 x^6+38 x^5+53 x^4+x^3+29 x^2+30 x+34$
• $y^2=47 x^6+35 x^5+60 x^4+59 x^3+61 x^2+33 x+10$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{79^{2}}$.

Endomorphism algebra over $\F_{79}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-105}, \sqrt{211})\).

Endomorphism algebra over $\overline{\F}_{79}$

The base change of $A$ to $\F_{79^{2}}$ is 1.6241.acb^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-22155}) \)$)$

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
2.79.a_cb	$4$	(not in LMFDB)