Invariants
| Base field: | $\F_{61}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 10 x + 61 x^{2} )( 1 + 5 x + 61 x^{2} )$ |
| $1 - 5 x + 72 x^{2} - 305 x^{3} + 3721 x^{4}$ | |
| Frobenius angles: | $\pm0.278857938376$, $\pm0.603713893500$ |
| Angle rank: | $2$ (numerical) |
| Jacobians: | $240$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $3484$ | $14298336$ | $51529251904$ | $191776431600000$ | $713407927251995404$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $57$ | $3841$ | $227022$ | $13850833$ | $844673277$ | $51519969286$ | $3142736641857$ | $191707316097793$ | $11694146144344422$ | $713342911315264681$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 240 curves (of which all are hyperelliptic):
- $y^2=37 x^6+3 x^5+23 x^4+19 x^3+58 x^2+44 x+9$
- $y^2=22 x^6+8 x^5+9 x^4+16 x^3+30 x^2+15 x+27$
- $y^2=36 x^6+3 x^5+37 x^4+39 x^3+x^2+x+46$
- $y^2=30 x^6+18 x^5+22 x^4+11 x^3+2 x^2+52 x+51$
- $y^2=14 x^6+42 x^5+17 x^4+58 x^3+37 x^2+35 x+18$
- $y^2=18 x^6+2 x^5+x^4+34 x^3+8 x^2+25 x+7$
- $y^2=40 x^6+14 x^5+18 x^4+9 x^3+53 x^2+29 x+30$
- $y^2=5 x^6+17 x^5+4 x^4+13 x^3+3 x^2+33 x+60$
- $y^2=41 x^6+28 x^5+41 x^4+11 x^3+58 x^2+19 x$
- $y^2=x^6+51 x^5+48 x^4+41 x^3+23 x^2+x+36$
- $y^2=19 x^6+47 x^5+34 x^4+59 x^3+50 x^2+3 x$
- $y^2=10 x^6+36 x^5+40 x^4+17 x^3+5 x^2+52 x+28$
- $y^2=28 x^6+45 x^5+8 x^4+21 x^3+32 x^2+60 x+32$
- $y^2=57 x^6+41 x^5+58 x^4+28 x^3+52 x^2+48 x+7$
- $y^2=6 x^6+16 x^5+48 x^4+41 x^3+37 x^2+57 x+46$
- $y^2=42 x^6+44 x^5+23 x^4+58 x^3+49 x^2+31 x+22$
- $y^2=13 x^6+21 x^5+29 x^4+19 x^3+36 x^2+53 x+12$
- $y^2=37 x^6+13 x^5+20 x^4+60 x^3+27 x^2+22 x+12$
- $y^2=35 x^6+3 x^5+2 x^4+13 x^3+54 x^2+21 x+15$
- $y^2=19 x^6+60 x^5+48 x^4+59 x^3+25 x^2+7 x+13$
- and 220 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{61}$.
Endomorphism algebra over $\F_{61}$| The isogeny class factors as 1.61.ak $\times$ 1.61.f and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is: |
Base change
This is a primitive isogeny class.