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

• Label: 2.61.f_abk
• 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:	$1 + 5 x - 36 x^{2} + 305 x^{3} + 3721 x^{4}$
Frobenius angles:	$\pm0.270380560166$, $\pm0.937047226833$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-3}, \sqrt{73})\)
Galois group:	$C_2^2$
Jacobians:	$64$
Isomorphism classes:	136

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$3996$	$13490496$	$51880083984$	$191734537791744$	$713391921885610476$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$67$	$3625$	$228562$	$13847809$	$844654327$	$51520034086$	$3142740147187$	$191707289174689$	$11694146003022202$	$713342913340590625$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 64 curves (of which all are hyperelliptic):

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

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

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{61^{3}}$.

Endomorphism algebra over $\F_{61}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-3}, \sqrt{73})\).

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

The base change of $A$ to $\F_{61^{3}}$ is 1.226981.bek^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-219}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

Twist	Extension degree	Common base change
2.61.af_abk	$2$	(not in LMFDB)
2.61.ak_fr	$3$	(not in LMFDB)
2.61.a_dt	$6$	(not in LMFDB)