Invariants
| Base field: | $\F_{89}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 5 x^{2} + 7921 x^{4}$ |
| Frobenius angles: | $\pm0.245528767401$, $\pm0.754471232599$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{-173}, \sqrt{183})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $286$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $7917$ | $62678889$ | $496981409652$ | $3938573969447481$ | $31181719928402575077$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $90$ | $7912$ | $704970$ | $62773876$ | $5584059450$ | $496981528342$ | $44231334895530$ | $3936588556316068$ | $350356403707485210$ | $31181719926838966552$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 286 curves (of which all are hyperelliptic):
- $y^2=54 x^6+44 x^5+39 x^4+45 x^3+70 x^2+72 x+64$
- $y^2=32 x^6+69 x^5+81 x^4+6 x^3+63 x^2+78 x+75$
- $y^2=48 x^6+20 x^5+5 x^4+51 x^3+77 x^2+22 x+31$
- $y^2=55 x^6+60 x^5+15 x^4+64 x^3+53 x^2+66 x+4$
- $y^2=31 x^6+11 x^5+65 x^4+65 x^3+40 x^2+56 x+51$
- $y^2=4 x^6+33 x^5+17 x^4+17 x^3+31 x^2+79 x+64$
- $y^2=48 x^6+15 x^5+68 x^4+34 x^3+54 x^2+13$
- $y^2=55 x^6+45 x^5+26 x^4+13 x^3+73 x^2+39$
- $y^2=69 x^6+62 x^5+88 x^4+3 x^3+29 x^2+28 x+79$
- $y^2=29 x^6+8 x^5+86 x^4+9 x^3+87 x^2+84 x+59$
- $y^2=25 x^6+50 x^5+83 x^4+4 x^3+81 x^2+23 x+35$
- $y^2=75 x^6+61 x^5+71 x^4+12 x^3+65 x^2+69 x+16$
- $y^2=9 x^6+67 x^5+22 x^4+46 x^3+82 x^2+18 x+77$
- $y^2=x^6+12 x^5+5 x^4+75 x^3+12 x^2+5 x+11$
- $y^2=3 x^6+36 x^5+15 x^4+47 x^3+36 x^2+15 x+33$
- $y^2=26 x^6+38 x^5+80 x^4+82 x^3+33 x^2+65 x+2$
- $y^2=78 x^6+25 x^5+62 x^4+68 x^3+10 x^2+17 x+6$
- $y^2=30 x^6+41 x^5+71 x^4+88 x^3+29 x^2+85 x+54$
- $y^2=x^6+34 x^5+35 x^4+86 x^3+87 x^2+77 x+73$
- $y^2=45 x^6+14 x^5+76 x^4+45 x^3+30 x^2+21 x+67$
- and 266 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 \(\Q(\sqrt{-173}, \sqrt{183})\). |
| The base change of $A$ to $\F_{89^{2}}$ is 1.7921.af 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-31659}) \)$)$ |
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_f | $4$ | (not in LMFDB) |