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

• Label: 2.79.a_ga
• 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:	$1 + 156 x^{2} + 6241 x^{4}$
Frobenius angles:	$\pm0.474649836354$, $\pm0.525350163646$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{2}, \sqrt{-157})\)
Galois group:	$C_2^2$
Jacobians:	$75$
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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$6398$	$40934404$	$243088331150$	$1516185599779984$	$9468276086930328878$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$80$	$6554$	$493040$	$38926374$	$3077056400$	$243089206778$	$19203908986160$	$1517108684672254$	$119851595982618320$	$9468276091233810554$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 75 curves (of which all are hyperelliptic):

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

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

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 \(\Q(\sqrt{2}, \sqrt{-157})\).

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

The base change of $A$ to $\F_{79^{2}}$ is 1.6241.ga^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-157}) \)$)$

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_aga	$4$	(not in LMFDB)
2.79.ac_c	$8$	(not in LMFDB)
2.79.c_c	$8$	(not in LMFDB)