Invariants
| Base field: | $\F_{89}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 14 x + 98 x^{2} - 1246 x^{3} + 7921 x^{4}$ |
| Frobenius angles: | $\pm0.0741879036170$, $\pm0.574187903617$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(i, \sqrt{129})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $228$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6760$ | $62732800$ | $495316130920$ | $3935404195840000$ | $31182157645122413800$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $76$ | $7922$ | $702604$ | $62723358$ | $5584137836$ | $496981290962$ | $44231322425324$ | $3936588878368318$ | $350356405325997196$ | $31181719929966183602$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 228 curves (of which all are hyperelliptic):
- $y^2=72 x^6+3 x^5+11 x^4+85 x^3+61 x^2+40 x+66$
- $y^2=19 x^6+72 x^5+46 x^4+19 x^3+23 x^2+51 x+2$
- $y^2=49 x^6+51 x^5+46 x^4+46 x^2+38 x+49$
- $y^2=36 x^6+50 x^5+33 x^4+46 x^3+17 x^2+85 x+37$
- $y^2=11 x^6+84 x^5+14 x^4+53 x^3+58 x^2+33 x+60$
- $y^2=28 x^6+19 x^5+22 x^4+18 x^3+62 x^2+39 x+81$
- $y^2=46 x^6+4 x^5+80 x^4+31 x^3+56 x^2+63 x+31$
- $y^2=35 x^6+11 x^5+58 x^4+61 x^3+69 x^2+32 x+58$
- $y^2=36 x^6+65 x^5+77 x^4+22 x^3+8 x^2+55 x+83$
- $y^2=22 x^6+43 x^5+55 x^4+64 x^3+41 x^2+30 x+9$
- $y^2=81 x^6+39 x^5+65 x^3+30 x^2+80 x+47$
- $y^2=15 x^6+27 x^5+78 x^4+63 x^3+19 x^2+33 x+25$
- $y^2=68 x^6+24 x^5+54 x^4+75 x^3+76 x^2+82 x+40$
- $y^2=4 x^6+46 x^5+59 x^4+51 x^3+20 x^2+42 x+15$
- $y^2=22 x^6+65 x^5+18 x^4+41 x^3+47 x^2+79 x+2$
- $y^2=4 x^6+32 x^5+25 x^4+55 x^3+55 x^2+77 x$
- $y^2=82 x^6+71 x^5+20 x^4+53 x^3+7 x^2+28$
- $y^2=62 x^6+84 x^5+21 x^4+11 x^3+34 x^2+55 x+52$
- $y^2=35 x^6+13 x^5+15 x^4+50 x^3+34 x^2+72 x+40$
- $y^2=77 x^6+63 x^5+47 x^4+80 x^3+63 x^2+37 x+45$
- and 208 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{89^{4}}$.
Endomorphism algebra over $\F_{89}$| The endomorphism algebra of this simple isogeny class is \(\Q(i, \sqrt{129})\). |
| The base change of $A$ to $\F_{89^{4}}$ is 1.62742241.anze 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-129}) \)$)$ |
- Endomorphism algebra over $\F_{89^{2}}$
The base change of $A$ to $\F_{89^{2}}$ is the simple isogeny class 2.7921.a_anze and its endomorphism algebra is \(\Q(i, \sqrt{129})\).
Base change
This is a primitive isogeny class.