Invariants
| Base field: | $\F_{89}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 100 x^{2} + 7921 x^{4}$ |
| Frobenius angles: | $\pm0.344945043679$, $\pm0.655054956321$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{78}, \sqrt{-278})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $416$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $8022$ | $64352484$ | $496979914662$ | $3937322045671056$ | $31181719931732304102$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $90$ | $8122$ | $704970$ | $62753926$ | $5584059450$ | $496978538362$ | $44231334895530$ | $3936588988413118$ | $350356403707485210$ | $31181719933498424602$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 416 curves (of which all are hyperelliptic):
- $y^2=67 x^6+12 x^5+39 x^4+43 x^3+35 x^2+50 x+34$
- $y^2=23 x^6+36 x^5+28 x^4+40 x^3+16 x^2+61 x+13$
- $y^2=64 x^6+6 x^5+62 x^4+45 x^3+34 x^2+87 x+79$
- $y^2=14 x^6+18 x^5+8 x^4+46 x^3+13 x^2+83 x+59$
- $y^2=41 x^6+52 x^5+24 x^4+58 x^3+86 x^2+22 x+39$
- $y^2=34 x^6+67 x^5+72 x^4+85 x^3+80 x^2+66 x+28$
- $y^2=23 x^6+28 x^5+68 x^4+54 x^3+84 x^2+19 x+40$
- $y^2=69 x^6+84 x^5+26 x^4+73 x^3+74 x^2+57 x+31$
- $y^2=43 x^6+20 x^5+12 x^4+27 x^3+88 x^2+2 x+66$
- $y^2=40 x^6+60 x^5+36 x^4+81 x^3+86 x^2+6 x+20$
- $y^2=65 x^6+64 x^5+40 x^4+46 x^3+79 x^2+72 x+47$
- $y^2=17 x^6+14 x^5+31 x^4+49 x^3+59 x^2+38 x+52$
- $y^2=52 x^6+71 x^5+10 x^4+69 x^3+82 x^2+59 x+74$
- $y^2=67 x^6+35 x^5+30 x^4+29 x^3+68 x^2+88 x+44$
- $y^2=70 x^6+64 x^5+17 x^4+79 x^3+9 x^2+5 x+38$
- $y^2=32 x^6+14 x^5+51 x^4+59 x^3+27 x^2+15 x+25$
- $y^2=28 x^6+52 x^5+7 x^4+23 x^3+85 x^2+76 x+41$
- $y^2=84 x^6+67 x^5+21 x^4+69 x^3+77 x^2+50 x+34$
- $y^2=20 x^6+4 x^5+23 x^4+43 x^3+78 x^2+26 x+14$
- $y^2=60 x^6+12 x^5+69 x^4+40 x^3+56 x^2+78 x+42$
- and 396 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 \(\Q(\sqrt{78}, \sqrt{-278})\). |
| The base change of $A$ to $\F_{89^{2}}$ is 1.7921.dw 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-5421}) \)$)$ |
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_adw | $4$ | (not in LMFDB) |