Minimal Weierstrass equation
Minimal Weierstrass equation
Simplified equation
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\(y^2=x^3-27x+378\)
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(homogenize, simplify) |
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\(y^2z=x^3-27xz^2+378z^3\)
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(dehomogenize, simplify) |
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\(y^2=x^3-27x+378\)
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(homogenize, minimize) |
Mordell-Weil group structure
\(\Z\)
Mordell-Weil generators
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| \( \left(3, 18\right) \) | $0.27404755538743900664593923666$ | $\infty$ |
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| \([3:18:1]\) | $0.27404755538743900664593923666$ | $\infty$ |
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| \( \left(3, 18\right) \) | $0.27404755538743900664593923666$ | $\infty$ |
Integral points
\((-6,\pm 18)\), \((3,\pm 18)\), \((19,\pm 82)\)
\([-6:\pm 18:1]\), \([3:\pm 18:1]\), \([19:\pm 82:1]\)
\((-6,\pm 18)\), \((3,\pm 18)\), \((19,\pm 82)\)
Invariants
| Conductor: | $N$ | = | \( 1296 \) | = | $2^{4} \cdot 3^{4}$ |
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| Minimal Discriminant: | $\Delta$ | = | $-60466176$ | = | $-1 \cdot 2^{10} \cdot 3^{10} $ |
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| j-invariant: | $j$ | = | \( -36 \) | = | $-1 \cdot 2^{2} \cdot 3^{2}$ |
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| Endomorphism ring: | $\mathrm{End}(E)$ | = | $\Z$ | |||
| Geometric endomorphism ring: | $\mathrm{End}(E_{\overline{\Q}})$ | = | \(\Z\) (no potential complex multiplication) |
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| Sato-Tate group: | $\mathrm{ST}(E)$ | = | $\mathrm{SU}(2)$ | |||
| Faltings height: | $h_{\mathrm{Faltings}}$ | ≈ | $0.17364655904733914721586262627$ |
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| Stable Faltings height: | $h_{\mathrm{stable}}$ | ≈ | $-1.3194863319760400201278685057$ |
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| $abc$ quality: | $Q$ | ≈ | $1.0412424573518235$ | |||
| Szpiro ratio: | $\sigma_{m}$ | ≈ | $3.543016566250846$ | |||
| Intrinsic torsion order: | $\#E(\mathbb Q)_\text{tors}^\text{is}$ | = | $1$ | |||
BSD invariants
| Analytic rank: | $r_{\mathrm{an}}$ | = | $ 1$ |
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| Mordell-Weil rank: | $r$ | = | $ 1$ |
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| Regulator: | $\mathrm{Reg}(E/\Q)$ | ≈ | $0.27404755538743900664593923666$ |
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| Real period: | $\Omega$ | ≈ | $1.6500445841442794950848407555$ |
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| Tamagawa product: | $\prod_{p}c_p$ | = | $ 6 $ = $ 2\cdot3 $ |
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| Torsion order: | $\#E(\Q)_{\mathrm{tor}}$ | = | $1$ |
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| Special value: | $ L'(E,1)$ | ≈ | $2.7131441073901391848020400435 $ |
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| Analytic order of Ш: | Ш${}_{\mathrm{an}}$ | ≈ | $1$ (rounded) |
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BSD formula
$$\begin{aligned} 2.713144107 \approx L'(E,1) & = \frac{\# Ш(E/\Q)\cdot \Omega_E \cdot \mathrm{Reg}(E/\Q) \cdot \prod_p c_p}{\#E(\Q)_{\rm tor}^2} \\ & \approx \frac{1 \cdot 1.650045 \cdot 0.274048 \cdot 6}{1^2} \\ & \approx 2.713144107\end{aligned}$$
Modular invariants
For more coefficients, see the Downloads section to the right.
| Modular degree: | 288 |
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| $ \Gamma_0(N) $-optimal: | yes | |
| Manin constant: | 1 |
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Local data at primes of bad reduction
This elliptic curve is not semistable. There are 2 primes $p$ of bad reduction:
| $p$ | Tamagawa number | Kodaira symbol | Reduction type | Root number | $\mathrm{ord}_p(N)$ | $\mathrm{ord}_p(\Delta)$ | $\mathrm{ord}_p(\mathrm{den}(j))$ |
|---|---|---|---|---|---|---|---|
| $2$ | $2$ | $I_{2}^{*}$ | additive | 1 | 4 | 10 | 0 |
| $3$ | $3$ | $IV^{*}$ | additive | 1 | 4 | 10 | 0 |
Galois representations
The $\ell$-adic Galois representation has maximal image for all primes $\ell$ except those listed in the table below.
| prime $\ell$ | mod-$\ell$ image | $\ell$-adic image | $\ell$-adic index |
|---|---|---|---|
| $2$ | 2G | 4.8.0.2 | $8$ |
| $5$ | 5S4 | 5.5.0.1 | $5$ |
The image $H:=\rho_E(\Gal(\overline{\Q}/\Q))$ of the adelic Galois representation has label 60.80.2-20.b.1.1, level \( 60 = 2^{2} \cdot 3 \cdot 5 \), index $80$, genus $2$, and generators
$\left(\begin{array}{rr} 1 & 12 \\ 0 & 37 \end{array}\right),\left(\begin{array}{rr} 1 & 0 \\ 40 & 1 \end{array}\right),\left(\begin{array}{rr} 29 & 45 \\ 0 & 59 \end{array}\right),\left(\begin{array}{rr} 19 & 0 \\ 0 & 59 \end{array}\right),\left(\begin{array}{rr} 21 & 40 \\ 20 & 21 \end{array}\right),\left(\begin{array}{rr} 1 & 45 \\ 45 & 46 \end{array}\right),\left(\begin{array}{rr} 49 & 12 \\ 36 & 37 \end{array}\right),\left(\begin{array}{rr} 1 & 24 \\ 36 & 25 \end{array}\right)$.
The torsion field $K:=\Q(E[60])$ is a degree-$27648$ Galois extension of $\Q$ with $\Gal(K/\Q)$ isomorphic to the projection of $H$ to $\GL_2(\Z/60\Z)$.
The table below list all primes $\ell$ for which the Serre invariants associated to the mod-$\ell$ Galois representation are exceptional.
| $\ell$ | Reduction type | Serre weight | Serre conductor |
|---|---|---|---|
| $2$ | additive | $2$ | \( 81 = 3^{4} \) |
| $3$ | additive | $4$ | \( 8 = 2^{3} \) |
Isogenies
This curve has no rational isogenies. Its isogeny class 1296a consists of this curve only.
Twists
The minimal quadratic twist of this elliptic curve is 648a1, its twist by $12$.
Growth of torsion in number fields
The number fields $K$ of degree less than 24 such that $E(K)_{\rm tors}$ is strictly larger than $E(\Q)_{\rm tors}$ (which is trivial) are as follows:
| $[K:\Q]$ | $K$ | $E(K)_{\rm tors}$ | Base change curve |
|---|---|---|---|
| $3$ | 3.1.324.1 | \(\Z/2\Z\) | not in database |
| $6$ | 6.0.419904.2 | \(\Z/2\Z \oplus \Z/2\Z\) | not in database |
| $6$ | 6.2.1259712.2 | \(\Z/4\Z\) | not in database |
| $6$ | 6.0.314928.2 | \(\Z/4\Z\) | not in database |
| $8$ | 8.2.725594112.1 | \(\Z/3\Z\) | not in database |
| $12$ | 12.0.1586874322944.4 | \(\Z/4\Z \oplus \Z/4\Z\) | not in database |
We only show fields where the torsion growth is primitive.
Iwasawa invariants
| $p$ | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | 37 | 41 | 43 | 47 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reduction type | add | add | ord | ss | ord | ord | ord | ord | ord | ord | ord | ord | ord | ord | ord |
| $\lambda$-invariant(s) | - | - | 3 | 1,1 | 1 | 1 | 3 | 3 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| $\mu$-invariant(s) | - | - | 0 | 0,0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
An entry - indicates that the invariants are not computed because the reduction is additive.
$p$-adic regulators
Note: $p$-adic regulator data only exists for primes $p\ge 5$ of good ordinary reduction.