Invariants
| Base field: | $\F_{89}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 4 x + 20 x^{2} + 356 x^{3} + 7921 x^{4}$ |
| Frobenius angles: | $\pm0.307493467934$, $\pm0.785075307124$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-190 +36 \sqrt{2}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $306$ |
| Isomorphism classes: | 306 |
| Cyclic group of points: | yes |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $8302$ | $62945764$ | $497610331918$ | $3938233701108112$ | $31180810211056260622$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $94$ | $7946$ | $705862$ | $62768454$ | $5583896534$ | $496980910730$ | $44231323277774$ | $3936588710150590$ | $350356405747866526$ | $31181719930863426986$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 306 curves (of which all are hyperelliptic):
- $y^2=48 x^6+56 x^5+19 x^4+61 x^3+24 x^2+78 x+32$
- $y^2=71 x^6+13 x^5+14 x^4+11 x^3+37 x^2+25 x+61$
- $y^2=66 x^6+85 x^5+53 x^4+24 x^3+13 x^2+24 x+8$
- $y^2=79 x^6+42 x^5+x^4+41 x^3+60 x^2+36 x+62$
- $y^2=24 x^6+81 x^5+82 x^4+28 x^3+38 x^2+77 x+22$
- $y^2=5 x^6+56 x^5+51 x^4+33 x^3+14 x^2+39 x+87$
- $y^2=41 x^6+58 x^5+50 x^4+8 x^3+23 x^2+72 x+36$
- $y^2=11 x^6+25 x^5+7 x^4+72 x^3+10 x^2+38 x+21$
- $y^2=77 x^6+63 x^5+61 x^4+15 x^3+71 x^2+56 x+84$
- $y^2=x^6+49 x^5+56 x^4+74 x^3+72 x^2+66 x+85$
- $y^2=71 x^6+7 x^5+16 x^4+25 x^3+21 x^2+69 x+61$
- $y^2=61 x^6+54 x^5+61 x^4+57 x^3+56 x^2+27 x+68$
- $y^2=16 x^6+35 x^5+51 x^4+63 x^3+40 x^2+13 x+29$
- $y^2=22 x^6+86 x^5+53 x^4+58 x^3+8 x^2+68 x+3$
- $y^2=69 x^6+15 x^5+75 x^4+12 x^3+65 x^2+16 x+79$
- $y^2=63 x^6+28 x^5+57 x^4+87 x^3+83 x^2+64 x+83$
- $y^2=7 x^6+72 x^5+27 x^4+5 x^3+67 x^2+56 x+85$
- $y^2=83 x^6+29 x^5+31 x^4+63 x^3+81 x^2+25 x+57$
- $y^2=14 x^6+12 x^4+51 x^3+39 x^2+62 x+35$
- $y^2=68 x^6+74 x^5+56 x^4+60 x^3+79 x^2+47 x+83$
- and 286 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{89}$.
Endomorphism algebra over $\F_{89}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-190 +36 \sqrt{2}})\). |
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.ae_u | $2$ | (not in LMFDB) |