Abelian variety isogeny class 2.83.a_j over $\F_{83}$

• Label: 2.83.a_j
• Base field: $\F_{83}$
• 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:	$\F_{83}$
Dimension:	$2$
L-polynomial:	$1 + 9 x^{2} + 6889 x^{4}$
Frobenius angles:	$\pm0.258633115447$, $\pm0.741366884553$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-7}, \sqrt{157})\)
Galois group:	$C_2^2$
Jacobians:	$135$
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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$6899$	$47596201$	$326940188096$	$2253592587936361$	$15516041189316426539$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$84$	$6908$	$571788$	$47485716$	$3939040644$	$326940002822$	$27136050989628$	$2252292046756708$	$186940255267540404$	$15516041191426999628$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 135 curves (of which all are hyperelliptic):

• $y^2=59 x^6+62 x^5+52 x^4+31 x^3+39 x^2+73 x+67$
• $y^2=35 x^6+41 x^5+21 x^4+62 x^3+78 x^2+63 x+51$
• $y^2=47 x^6+55 x^5+36 x^4+45 x^3+10 x^2+62 x+28$
• $y^2=11 x^6+27 x^5+72 x^4+7 x^3+20 x^2+41 x+56$
• $y^2=26 x^6+21 x^5+18 x^4+59 x^3+26 x^2+10 x+82$
• $y^2=4 x^6+59 x^5+26 x^4+65 x^3+76 x^2+54 x+18$
• $y^2=8 x^6+35 x^5+52 x^4+47 x^3+69 x^2+25 x+36$
• $y^2=38 x^6+15 x^5+21 x^4+76 x^3+73 x^2+21 x+71$
• $y^2=76 x^6+30 x^5+42 x^4+69 x^3+63 x^2+42 x+59$
• $y^2=77 x^6+7 x^5+29 x^4+25 x^3+32 x^2+74 x+34$
• $y^2=71 x^6+14 x^5+58 x^4+50 x^3+64 x^2+65 x+68$
• $y^2=58 x^6+46 x^5+76 x^4+54 x^3+3 x^2+3 x+63$
• $y^2=33 x^6+9 x^5+69 x^4+25 x^3+6 x^2+6 x+43$
• $y^2=40 x^6+23 x^5+27 x^4+41 x^3+72 x^2+16 x+73$
• $y^2=66 x^6+35 x^5+81 x^4+59 x^3+62 x^2+67 x+64$
• $y^2=49 x^6+70 x^5+79 x^4+35 x^3+41 x^2+51 x+45$
• $y^2=2 x^6+14 x^5+77 x^4+46 x^3+79 x^2+80 x+59$
• $y^2=78 x^6+58 x^5+50 x^4+70 x^3+59 x+3$
• $y^2=73 x^6+33 x^5+17 x^4+57 x^3+35 x+6$
• $y^2=21 x^6+58 x^5+8 x^4+36 x^3+26 x^2+58 x+33$
• and

• $y^2=42 x^6+33 x^5+16 x^4+72 x^3+52 x^2+33 x+66$
• $y^2=60 x^6+3 x^5+25 x^4+55 x^3+55 x^2+19 x+35$
• $y^2=37 x^6+6 x^5+50 x^4+27 x^3+27 x^2+38 x+70$
• $y^2=74 x^6+19 x^5+16 x^4+20 x^3+41 x^2+68 x+67$
• $y^2=65 x^6+38 x^5+32 x^4+40 x^3+82 x^2+53 x+51$
• $y^2=69 x^6+68 x^5+12 x^4+18 x^3+52 x^2+78 x+72$
• $y^2=47 x^6+12 x^5+78 x^4+33 x^3+4 x^2+48 x+74$
• $y^2=11 x^6+24 x^5+73 x^4+66 x^3+8 x^2+13 x+65$
• $y^2=79 x^6+75 x^5+74 x^4+61 x^3+25 x^2+18 x+67$
• $y^2=75 x^6+67 x^5+65 x^4+39 x^3+50 x^2+36 x+51$
• $y^2=79 x^6+33 x^5+37 x^4+31 x^3+11 x^2+24 x+74$
• $y^2=75 x^6+66 x^5+74 x^4+62 x^3+22 x^2+48 x+65$
• $y^2=70 x^6+74 x^5+x^4+52 x^3+53 x^2+22 x+63$
• $y^2=57 x^6+65 x^5+2 x^4+21 x^3+23 x^2+44 x+43$
• $y^2=2 x^6+50 x^5+72 x^4+71 x^3+79 x^2+67 x+36$
• $y^2=4 x^6+17 x^5+61 x^4+59 x^3+75 x^2+51 x+72$
• $y^2=40 x^6+75 x^5+78 x^4+29 x^3+53 x^2+20 x+52$
• $y^2=80 x^6+67 x^5+73 x^4+58 x^3+23 x^2+40 x+21$
• $y^2=29 x^6+60 x^5+39 x^4+18 x^3+38 x^2+18 x+57$
• $y^2=4 x^6+28 x^5+46 x^4+43 x^3+31 x^2+51 x+66$
• $y^2=31 x^6+40 x^5+17 x^4+2 x^3+31 x^2+29 x+40$
• $y^2=62 x^6+80 x^5+34 x^4+4 x^3+62 x^2+58 x+80$
• $y^2=2 x^6+38 x^5+56 x^4+33 x^3+65 x^2+51 x+81$
• $y^2=4 x^6+76 x^5+29 x^4+66 x^3+47 x^2+19 x+79$
• $y^2=59 x^6+6 x^5+30 x^4+33 x^3+44 x^2+3 x+77$
• $y^2=35 x^6+12 x^5+60 x^4+66 x^3+5 x^2+6 x+71$
• $y^2=49 x^6+27 x^5+52 x^4+71 x^3+65 x^2+28 x+10$
• $y^2=15 x^6+54 x^5+21 x^4+59 x^3+47 x^2+56 x+20$
• $y^2=10 x^6+24 x^5+56 x^4+69 x^3+43 x^2+65 x+61$
• $y^2=20 x^6+48 x^5+29 x^4+55 x^3+3 x^2+47 x+39$
• $y^2=43 x^6+30 x^5+12 x^4+8 x^3+27 x^2+15 x+21$
• $y^2=3 x^6+60 x^5+24 x^4+16 x^3+54 x^2+30 x+42$
• $y^2=45 x^6+12 x^5+33 x^4+71 x^3+57 x^2+59 x+46$
• $y^2=7 x^6+24 x^5+66 x^4+59 x^3+31 x^2+35 x+9$
• $y^2=11 x^6+34 x^5+48 x^4+27 x^3+28 x^2+54 x+42$
• $y^2=22 x^6+68 x^5+13 x^4+54 x^3+56 x^2+25 x+1$
• $y^2=37 x^6+17 x^5+64 x^4+15 x^3+27 x^2+29 x+32$
• $y^2=74 x^6+34 x^5+45 x^4+30 x^3+54 x^2+58 x+64$
• $y^2=73 x^6+77 x^5+47 x^4+38 x^3+51 x^2+21 x+38$
• $y^2=63 x^6+71 x^5+11 x^4+76 x^3+19 x^2+42 x+76$
• $y^2=x^6+54 x^5+70 x^4+15 x^3+22 x^2+80 x+76$
• $y^2=40 x^6+48 x^5+63 x^4+54 x^3+59 x^2+61 x+71$
• $y^2=80 x^6+13 x^5+43 x^4+25 x^3+35 x^2+39 x+59$
• $y^2=79 x^6+9 x^5+80 x^4+63 x^3+76 x^2+37 x+26$
• $y^2=75 x^6+18 x^5+77 x^4+43 x^3+69 x^2+74 x+52$
• $y^2=21 x^6+56 x^5+57 x^4+62 x^3+57 x^2+81 x+21$
• $y^2=42 x^6+29 x^5+31 x^4+41 x^3+31 x^2+79 x+42$
• $y^2=65 x^6+82 x^5+46 x^4+19 x^3+16 x^2+82 x+17$
• $y^2=47 x^6+81 x^5+9 x^4+38 x^3+32 x^2+81 x+34$
• $y^2=10 x^6+51 x^5+30 x^4+35 x^3+62 x^2+45 x+40$
• $y^2=20 x^6+19 x^5+60 x^4+70 x^3+41 x^2+7 x+80$
• $y^2=14 x^6+81 x^5+41 x^4+13 x^3+22 x+48$
• $y^2=28 x^6+79 x^5+82 x^4+26 x^3+44 x+13$
• $y^2=28 x^6+31 x^5+66 x^4+62 x^3+x^2+7 x+19$
• $y^2=31 x^6+78 x^5+29 x^4+60 x^2+x+53$
• $y^2=4 x^6+35 x^5+44 x^4+27 x^3+59 x^2+77$
• $y^2=8 x^6+70 x^5+5 x^4+54 x^3+35 x^2+71$
• $y^2=12 x^6+14 x^5+6 x^4+77 x^3+47 x^2+32 x+54$
• $y^2=24 x^6+28 x^5+12 x^4+71 x^3+11 x^2+64 x+25$
• $y^2=66 x^6+10 x^5+23 x^4+50 x^3+23 x^2+67 x+59$
• $y^2=49 x^6+20 x^5+46 x^4+17 x^3+46 x^2+51 x+35$
• $y^2=3 x^6+70 x^5+33 x^4+33 x^3+76 x^2+11 x+58$
• $y^2=28 x^6+13 x^5+74 x^4+64 x^3+9 x^2+27 x+13$
• $y^2=56 x^6+26 x^5+65 x^4+45 x^3+18 x^2+54 x+26$
• $y^2=57 x^6+16 x^5+5 x^4+40 x^3+76 x+11$
• $y^2=31 x^6+32 x^5+10 x^4+80 x^3+69 x+22$
• $y^2=10 x^6+25 x^5+53 x^4+56 x^3+40 x^2+3 x+75$
• $y^2=20 x^6+50 x^5+23 x^4+29 x^3+80 x^2+6 x+67$
• $y^2=3 x^6+14 x^5+26 x^4+66 x^3+60 x^2+70 x+20$
• $y^2=6 x^6+28 x^5+52 x^4+49 x^3+37 x^2+57 x+40$
• $y^2=5 x^6+64 x^5+34 x^4+44 x^3+7 x^2+27 x+54$
• $y^2=10 x^6+45 x^5+68 x^4+5 x^3+14 x^2+54 x+25$
• $y^2=60 x^6+8 x^5+37 x^4+58 x^3+75 x^2+55 x+19$
• $y^2=37 x^6+16 x^5+74 x^4+33 x^3+67 x^2+27 x+38$
• $y^2=30 x^6+29 x^5+65 x^4+73 x^3+65 x^2+42 x+73$
• $y^2=60 x^6+58 x^5+47 x^4+63 x^3+47 x^2+x+63$
• $y^2=37 x^6+51 x^5+64 x^4+78 x^3+43 x^2+25 x+67$
• $y^2=74 x^6+19 x^5+45 x^4+73 x^3+3 x^2+50 x+51$
• $y^2=34 x^6+5 x^5+56 x^4+34 x^3+63 x^2+37 x+39$
• $y^2=68 x^6+10 x^5+29 x^4+68 x^3+43 x^2+74 x+78$
• $y^2=49 x^6+45 x^5+48 x^4+64 x^3+50 x^2+59 x+23$
• $y^2=15 x^6+7 x^5+13 x^4+45 x^3+17 x^2+35 x+46$
• $y^2=32 x^6+68 x^5+79 x^4+20 x^3+45 x^2+12 x+65$
• $y^2=64 x^6+53 x^5+75 x^4+40 x^3+7 x^2+24 x+47$
• $y^2=80 x^6+42 x^5+7 x^4+62 x^3+25 x^2+18 x+36$
• $y^2=77 x^6+x^5+14 x^4+41 x^3+50 x^2+36 x+72$
• $y^2=41 x^6+77 x^5+51 x^4+51 x^3+66 x^2+57 x+36$
• $y^2=82 x^6+71 x^5+19 x^4+19 x^3+49 x^2+31 x+72$
• $y^2=8 x^6+46 x^5+13 x^4+19 x^3+35 x^2+26 x+50$
• $y^2=16 x^6+9 x^5+26 x^4+38 x^3+70 x^2+52 x+17$
• $y^2=55 x^6+3 x^5+35 x^4+68 x^3+6 x^2+70 x+33$
• $y^2=27 x^6+6 x^5+70 x^4+53 x^3+12 x^2+57 x+66$
• $y^2=80 x^6+9 x^5+35 x^4+63 x^3+52 x^2+26 x+33$
• $y^2=77 x^6+18 x^5+70 x^4+43 x^3+21 x^2+52 x+66$
• $y^2=12 x^6+45 x^5+53 x^4+27 x^3+27 x^2+33 x+5$
• $y^2=24 x^6+7 x^5+23 x^4+54 x^3+54 x^2+66 x+10$
• $y^2=24 x^6+27 x^5+5 x^4+20 x^3+30 x^2+43 x+47$
• $y^2=48 x^6+54 x^5+10 x^4+40 x^3+60 x^2+3 x+11$
• $y^2=2 x^6+35 x^5+53 x^4+12 x^3+12 x^2+72 x+51$
• $y^2=18 x^6+5 x^5+45 x^4+11 x^3+9 x^2+x+9$
• $y^2=36 x^6+10 x^5+7 x^4+22 x^3+18 x^2+2 x+18$
• $y^2=38 x^6+62 x^5+3 x^4+23 x^3+18 x^2+74 x+74$
• $y^2=81 x^6+26 x^5+11 x^4+26 x^3+58 x^2+25 x+35$
• $y^2=79 x^6+52 x^5+22 x^4+52 x^3+33 x^2+50 x+70$
• $y^2=11 x^6+52 x^5+8 x^4+38 x^3+38 x^2+32 x+13$
• $y^2=71 x^6+13 x^5+8 x^4+39 x^3+22 x^2+39 x+34$
• $y^2=59 x^6+26 x^5+16 x^4+78 x^3+44 x^2+78 x+68$
• $y^2=69 x^6+15 x^5+47 x^4+48 x^3+31 x^2+19 x+58$
• $y^2=27 x^6+22 x^5+31 x^4+13 x^3+49 x^2+30 x+79$
• $y^2=54 x^6+44 x^5+62 x^4+26 x^3+15 x^2+60 x+75$
• $y^2=14 x^6+13 x^5+33 x^4+48 x^3+6 x^2+5 x+65$
• $y^2=28 x^6+26 x^5+66 x^4+13 x^3+12 x^2+10 x+47$
• $y^2=55 x^6+38 x^5+19 x^4+44 x^3+23 x^2+44 x+9$
• $y^2=27 x^6+76 x^5+38 x^4+5 x^3+46 x^2+5 x+18$
• $y^2=78 x^6+22 x^5+31 x^4+17 x^3+45 x^2+67 x+34$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{83^{2}}$.

Endomorphism algebra over $\F_{83}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-7}, \sqrt{157})\).

Endomorphism algebra over $\overline{\F}_{83}$

The base change of $A$ to $\F_{83^{2}}$ is 1.6889.j^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-1099}) \)$)$

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
2.83.a_aj	$4$	(not in LMFDB)