Invariants
| Base field: | $\F_{89}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 96 x^{2} + 7921 x^{4}$ |
| Frobenius angles: | $\pm0.340660438396$, $\pm0.659339561604$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{82}, \sqrt{-274})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $264$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $8018$ | $64288324$ | $496979894450$ | $3937420435281424$ | $31181719933196216978$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $90$ | $8114$ | $704970$ | $62755494$ | $5584059450$ | $496978497938$ | $44231334895530$ | $3936588968863294$ | $350356403707485210$ | $31181719936426250354$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 264 curves (of which all are hyperelliptic):
- $y^2=62 x^6+82 x^5+66 x^4+37 x^3+82 x^2+69 x+59$
- $y^2=8 x^6+68 x^5+20 x^4+22 x^3+68 x^2+29 x+88$
- $y^2=46 x^6+82 x^5+41 x^4+52 x^3+77 x^2+37 x+52$
- $y^2=49 x^6+68 x^5+34 x^4+67 x^3+53 x^2+22 x+67$
- $y^2=23 x^6+64 x^5+33 x^4+32 x^3+10 x^2+31 x+2$
- $y^2=69 x^6+14 x^5+10 x^4+7 x^3+30 x^2+4 x+6$
- $y^2=88 x^6+86 x^4+34 x^3+10 x^2+88 x+47$
- $y^2=86 x^6+80 x^4+13 x^3+30 x^2+86 x+52$
- $y^2=12 x^6+11 x^5+35 x^4+63 x^3+6 x^2+11 x+73$
- $y^2=36 x^6+33 x^5+16 x^4+11 x^3+18 x^2+33 x+41$
- $y^2=44 x^6+13 x^5+28 x^4+62 x^3+5 x^2+36 x+45$
- $y^2=43 x^6+39 x^5+84 x^4+8 x^3+15 x^2+19 x+46$
- $y^2=81 x^6+77 x^5+83 x^4+30 x^3+27 x^2+20 x+69$
- $y^2=65 x^6+53 x^5+71 x^4+x^3+81 x^2+60 x+29$
- $y^2=40 x^6+59 x^5+13 x^4+84 x^3+22 x^2+81 x+17$
- $y^2=31 x^6+88 x^5+39 x^4+74 x^3+66 x^2+65 x+51$
- $y^2=64 x^6+70 x^5+30 x^4+72 x^3+30 x^2+16 x+64$
- $y^2=14 x^6+32 x^5+x^4+38 x^3+x^2+48 x+14$
- $y^2=88 x^6+2 x^5+11 x^4+21 x^3+86 x^2+55 x+44$
- $y^2=86 x^6+6 x^5+33 x^4+63 x^3+80 x^2+76 x+43$
- and 244 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{89^{2}}$.
Endomorphism algebra over $\F_{89}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{82}, \sqrt{-274})\). |
| The base change of $A$ to $\F_{89^{2}}$ is 1.7921.ds 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-5617}) \)$)$ |
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 |
|---|---|---|
| 2.89.a_ads | $4$ | (not in LMFDB) |