Invariants
| Base field: | $\F_{61}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 4 x + 46 x^{2} + 244 x^{3} + 3721 x^{4}$ |
| Frobenius angles: | $\pm0.353359532447$, $\pm0.747099942060$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-10 + \sqrt{5}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $348$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
This isogeny class is simple and 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4016$ | $14136320$ | $51575564336$ | $191838004920320$ | $713273323688400816$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $66$ | $3798$ | $227226$ | $13855278$ | $844513906$ | $51519927558$ | $3142745203146$ | $191707309075038$ | $11694146415251106$ | $713342911638617398$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 348 curves (of which all are hyperelliptic):
- $y^2=4 x^6+40 x^5+34 x^4+29 x^3+9 x^2+31 x+55$
- $y^2=58 x^6+52 x^5+55 x^4+45 x^3+43 x^2+24 x+57$
- $y^2=6 x^6+46 x^5+56 x^4+26 x^3+9 x^2+13 x+4$
- $y^2=13 x^6+34 x^5+39 x^4+46 x^3+43 x^2+60 x+54$
- $y^2=56 x^6+16 x^5+13 x^4+40 x^3+49 x^2+51 x+12$
- $y^2=47 x^6+31 x^5+56 x^4+10 x^3+23 x^2+4$
- $y^2=52 x^6+29 x^5+29 x^4+55 x^3+48 x^2+13 x+52$
- $y^2=x^6+10 x^5+28 x^4+39 x^3+35 x^2+9 x+7$
- $y^2=13 x^6+24 x^5+40 x^4+57 x^3+4 x^2+19 x+29$
- $y^2=40 x^6+53 x^5+60 x^4+16 x^3+5 x^2+55 x+29$
- $y^2=26 x^6+38 x^5+16 x^4+4 x^3+59 x^2+41 x+46$
- $y^2=20 x^6+42 x^5+45 x^4+52 x^3+21 x^2+7 x+46$
- $y^2=31 x^6+53 x^5+43 x^4+49 x^3+x^2+59 x+40$
- $y^2=33 x^5+9 x^4+50 x^3+32 x^2+41 x+1$
- $y^2=57 x^6+8 x^5+49 x^4+28 x^3+3 x^2+22$
- $y^2=55 x^6+8 x^5+11 x^4+x^3+44 x^2+22 x+4$
- $y^2=15 x^6+54 x^5+48 x^4+45 x^3+8 x^2+x+40$
- $y^2=36 x^6+44 x^5+14 x^4+20 x^3+4 x^2+46 x+3$
- $y^2=27 x^6+4 x^5+41 x^4+22 x^3+45 x^2+42 x+38$
- $y^2=29 x^5+55 x^4+3 x^3+4 x^2+47 x+7$
- and 328 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{61}$.
Endomorphism algebra over $\F_{61}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-10 + \sqrt{5}})\). |
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 |
|---|---|---|
| 2.61.ae_bu | $2$ | (not in LMFDB) |