Invariants
| Base field: | $\F_{61}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 13 x + 61 x^{2} )( 1 - x + 61 x^{2} )$ |
| $1 - 14 x + 135 x^{2} - 854 x^{3} + 3721 x^{4}$ | |
| Frobenius angles: | $\pm0.187058313935$, $\pm0.479608352732$ |
| Angle rank: | $1$ (numerical) |
| Jacobians: | $242$ |
| Cyclic group of points: | yes |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $2989$ | $14123025$ | $51603482896$ | $191680082091225$ | $713375535687015229$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $48$ | $3796$ | $227346$ | $13843876$ | $844634928$ | $51521216038$ | $3142746371568$ | $191707289170756$ | $11694145857028026$ | $713342911465657876$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 242 curves (of which all are hyperelliptic):
- $y^2=7 x^6+31 x^5+46 x^4+21 x^3+27 x^2+54 x+32$
- $y^2=12 x^6+14 x^5+34 x^4+50 x^3+54 x^2+20 x+56$
- $y^2=22 x^6+4 x^5+27 x^4+46 x^3+47 x^2+40 x+47$
- $y^2=55 x^6+47 x^5+30 x^4+30 x^3+13 x^2+44 x+16$
- $y^2=40 x^6+3 x^5+3 x^4+26 x^3+9 x^2+14 x+37$
- $y^2=34 x^6+17 x^5+49 x^4+15 x^3+7 x^2+24 x+35$
- $y^2=14 x^6+52 x^5+49 x^4+51 x^2+8 x+2$
- $y^2=20 x^6+41 x^5+48 x^4+44 x^3+25 x^2+4 x+3$
- $y^2=59 x^6+52 x^5+22 x^4+3 x^3+42 x^2+4 x+22$
- $y^2=13 x^6+36 x^5+38 x^4+25 x^3+36 x^2+33 x+30$
- $y^2=51 x^6+x^5+47 x^4+32 x^3+32 x^2+42 x+47$
- $y^2=59 x^6+4 x^5+14 x^4+28 x^3+55 x^2+55 x+53$
- $y^2=25 x^6+39 x^5+35 x^4+27 x^3+30 x^2+5 x+49$
- $y^2=60 x^6+26 x^5+13 x^4+24 x^3+32 x^2+36 x+50$
- $y^2=36 x^6+31 x^5+x^4+33 x^3+36 x^2+50 x+24$
- $y^2=29 x^6+4 x^5+15 x^4+44 x^3+52 x^2+26 x+47$
- $y^2=53 x^6+18 x^5+2 x^4+20 x^3+40 x^2+53 x+11$
- $y^2=39 x^6+24 x^5+8 x^4+18 x^3+59 x^2+14 x+15$
- $y^2=56 x^6+10 x^5+22 x^4+36 x^3+16 x^2+8 x+47$
- $y^2=11 x^6+49 x^5+15 x^4+60 x^3+13 x^2+4 x+17$
- and 222 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{61^{3}}$.
Endomorphism algebra over $\F_{61}$| The isogeny class factors as 1.61.an $\times$ 1.61.ab and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is: |
| The base change of $A$ to $\F_{61^{3}}$ is 1.226981.ha 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-3}) \)$)$ |
Base change
This is a primitive isogeny class.