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Properties

Label 485520ho1
Conductor $485520$
Discriminant $-2.686\times 10^{25}$
j-invariant \( \frac{421792317902132351}{271682182840320} \)
CM no
Rank $1$
Torsion structure \(\Z/{2}\Z\)

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Show commands: Magma / Oscar / PariGP / SageMath

Minimal Weierstrass equation

Minimal Weierstrass equation

Simplified equation

\(y^2=x^3+x^2+72245280x-79437287052\) Copy content Toggle raw display (homogenize, simplify)
\(y^2z=x^3+x^2z+72245280xz^2-79437287052z^3\) Copy content Toggle raw display (dehomogenize, simplify)
\(y^2=x^3+5851867653x-57927337863894\) Copy content Toggle raw display (homogenize, minimize)

comment: Define the curve
 
sage: E = EllipticCurve([0, 1, 0, 72245280, -79437287052])
 
gp: E = ellinit([0, 1, 0, 72245280, -79437287052])
 
magma: E := EllipticCurve([0, 1, 0, 72245280, -79437287052]);
 
oscar: E = elliptic_curve([0, 1, 0, 72245280, -79437287052])
 
sage: E.short_weierstrass_model()
 
magma: WeierstrassModel(E);
 
oscar: short_weierstrass_model(E)
 

Mordell-Weil group structure

\(\Z \oplus \Z/{2}\Z\)

magma: MordellWeilGroup(E);
 

Infinite order Mordell-Weil generator and height

$P$ =  \(\left(15243, 2136288\right)\) Copy content Toggle raw display
$\hat{h}(P)$ ≈  $6.2037292980679889675668612471$

sage: E.gens()
 
magma: Generators(E);
 
gp: E.gen
 

Torsion generators

\( \left(1082, 0\right) \) Copy content Toggle raw display

comment: Torsion subgroup
 
sage: E.torsion_subgroup().gens()
 
gp: elltors(E)
 
magma: TorsionSubgroup(E);
 
oscar: torsion_structure(E)
 

Integral points

\( \left(1082, 0\right) \), \((15243,\pm 2136288)\) Copy content Toggle raw display

comment: Integral points
 
sage: E.integral_points()
 
magma: IntegralPoints(E);
 

Invariants

Conductor: \( 485520 \)  =  $2^{4} \cdot 3 \cdot 5 \cdot 7 \cdot 17^{2}$
comment: Conductor
 
sage: E.conductor().factor()
 
gp: ellglobalred(E)[1]
 
magma: Conductor(E);
 
oscar: conductor(E)
 
Discriminant: $-26860533491215728566599680 $  =  $-1 \cdot 2^{40} \cdot 3^{5} \cdot 5 \cdot 7^{2} \cdot 17^{7} $
comment: Discriminant
 
sage: E.discriminant().factor()
 
gp: E.disc
 
magma: Discriminant(E);
 
oscar: discriminant(E)
 
j-invariant: \( \frac{421792317902132351}{271682182840320} \)  =  $2^{-28} \cdot 3^{-5} \cdot 5^{-1} \cdot 7^{-2} \cdot 17^{-1} \cdot 359^{3} \cdot 2089^{3}$
comment: j-invariant
 
sage: E.j_invariant().factor()
 
gp: E.j
 
magma: jInvariant(E);
 
oscar: j_invariant(E)
 
Endomorphism ring: $\Z$
Geometric endomorphism ring: \(\Z\) (no potential complex multiplication)
sage: E.has_cm()
 
magma: HasComplexMultiplication(E);
 
Sato-Tate group: $\mathrm{SU}(2)$
Faltings height: $3.5683149212004159607574683802\dots$
gp: ellheight(E)
 
magma: FaltingsHeight(E);
 
oscar: faltings_height(E)
 
Stable Faltings height: $1.4585610686123626112154689498\dots$
magma: StableFaltingsHeight(E);
 
oscar: stable_faltings_height(E)
 
$abc$ quality: $0.9946394951099224\dots$
Szpiro ratio: $5.033258816529386\dots$

BSD invariants

Analytic rank: $1$
sage: E.analytic_rank()
 
gp: ellanalyticrank(E)
 
magma: AnalyticRank(E);
 
Regulator: $6.2037292980679889675668612471\dots$
comment: Regulator
 
sage: E.regulator()
 
G = E.gen \\ if available
 
matdet(ellheightmatrix(E,G))
 
magma: Regulator(E);
 
Real period: $0.038206058572232767710641981515\dots$
comment: Real Period
 
sage: E.period_lattice().omega()
 
gp: if(E.disc>0,2,1)*E.omega[1]
 
magma: (Discriminant(E) gt 0 select 2 else 1) * RealPeriod(E);
 
Tamagawa product: $ 160 $  = $ 2^{2}\cdot5\cdot1\cdot2\cdot2^{2} $
comment: Tamagawa numbers
 
sage: E.tamagawa_numbers()
 
gp: gr=ellglobalred(E); [[gr[4][i,1],gr[5][i][4]] | i<-[1..#gr[4][,1]]]
 
magma: TamagawaNumbers(E);
 
oscar: tamagawa_numbers(E)
 
Torsion order: $2$
comment: Torsion order
 
sage: E.torsion_order()
 
gp: elltors(E)[1]
 
magma: Order(TorsionSubgroup(E));
 
oscar: prod(torsion_structure(E)[1])
 
Analytic order of Ш: $1$ ( rounded)
comment: Order of Sha
 
sage: E.sha().an_numerical()
 
magma: MordellWeilShaInformation(E);
 
Special value: $ L'(E,1) $ ≈ $ 9.4808017971304824319705272753 $
comment: Special L-value
 
r = E.rank();
 
E.lseries().dokchitser().derivative(1,r)/r.factorial()
 
gp: [r,L1r] = ellanalyticrank(E); L1r/r!
 
magma: Lr1 where r,Lr1 := AnalyticRank(E: Precision:=12);
 

BSD formula

$\displaystyle 9.480801797 \approx L'(E,1) = \frac{\# Ш(E/\Q)\cdot \Omega_E \cdot \mathrm{Reg}(E/\Q) \cdot \prod_p c_p}{\#E(\Q)_{\rm tor}^2} \approx \frac{1 \cdot 0.038206 \cdot 6.203729 \cdot 160}{2^2} \approx 9.480801797$

# self-contained SageMath code snippet for the BSD formula (checks rank, computes analytic sha)
 
E = EllipticCurve(%s); r = E.rank(); ar = E.analytic_rank(); assert r == ar;
 
Lr1 = E.lseries().dokchitser().derivative(1,r)/r.factorial(); sha = E.sha().an_numerical();
 
omega = E.period_lattice().omega(); reg = E.regulator(); tam = E.tamagawa_product(); tor = E.torsion_order();
 
assert r == ar; print("analytic sha: " + str(RR(Lr1) * tor^2 / (omega * reg * tam)))
 
/* self-contained Magma code snippet for the BSD formula (checks rank, computes analytic sha) */
 
E := EllipticCurve(%s); r := Rank(E); ar,Lr1 := AnalyticRank(E: Precision := 12); assert r eq ar;
 
sha := MordellWeilShaInformation(E); omega := RealPeriod(E) * (Discriminant(E) gt 0 select 2 else 1);
 
reg := Regulator(E); tam := &*TamagawaNumbers(E); tor := #TorsionSubgroup(E);
 
assert r eq ar; print "analytic sha:", Lr1 * tor^2 / (omega * reg * tam);
 

Modular invariants

Modular form 485520.2.a.ho

\( q + q^{3} + q^{5} + q^{7} + q^{9} - 4 q^{11} - 6 q^{13} + q^{15} + 4 q^{19} + O(q^{20}) \) Copy content Toggle raw display

comment: q-expansion of modular form
 
sage: E.q_eigenform(20)
 
\\ actual modular form, use for small N
 
[mf,F] = mffromell(E)
 
Ser(mfcoefs(mf,20),q)
 
\\ or just the series
 
Ser(ellan(E,20),q)*q
 
magma: ModularForm(E);
 

For more coefficients, see the Downloads section to the right.

Modular degree: 123863040
comment: Modular degree
 
sage: E.modular_degree()
 
gp: ellmoddegree(E)
 
magma: ModularDegree(E);
 
$ \Gamma_0(N) $-optimal: not computed* (one of 3 curves in this isogeny class which might be optimal)
Manin constant: 1 (conditional*)
comment: Manin constant
 
magma: ManinConstant(E);
 
* The optimal curve in each isogeny class has not been determined in all cases for conductors over 400000. The Manin constant is correct provided that this curve is optimal.

Local data

This elliptic curve is not semistable. There are 5 primes $p$ of bad reduction:

$p$ Tamagawa number Kodaira symbol Reduction type Root number $v_p(N)$ $v_p(\Delta)$ $v_p(\mathrm{den}(j))$
$2$ $4$ $I_{32}^{*}$ additive -1 4 40 28
$3$ $5$ $I_{5}$ split multiplicative -1 1 5 5
$5$ $1$ $I_{1}$ split multiplicative -1 1 1 1
$7$ $2$ $I_{2}$ split multiplicative -1 1 2 2
$17$ $4$ $I_{1}^{*}$ additive 1 2 7 1

comment: Local data
 
sage: E.local_data()
 
gp: ellglobalred(E)[5]
 
magma: [LocalInformation(E,p) : p in BadPrimes(E)];
 
oscar: [(p,tamagawa_number(E,p), kodaira_symbol(E,p), reduction_type(E,p)) for p in bad_primes(E)]
 

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
$2$ 2B 4.12.0.8

comment: mod p Galois image
 
sage: rho = E.galois_representation(); [rho.image_type(p) for p in rho.non_surjective()]
 
magma: [GaloisRepresentation(E,p): p in PrimesUpTo(20)];
 

gens = [[7, 6, 2034, 2035], [1, 0, 8, 1], [688, 3, 685, 2], [1, 8, 0, 1], [1, 4, 4, 17], [1076, 2039, 577, 2034], [1271, 1272, 242, 1265], [2033, 8, 2032, 9], [416, 3, 5, 2], [1283, 1278, 770, 1787]]
 
GL(2,Integers(2040)).subgroup(gens)
 
Gens := [[7, 6, 2034, 2035], [1, 0, 8, 1], [688, 3, 685, 2], [1, 8, 0, 1], [1, 4, 4, 17], [1076, 2039, 577, 2034], [1271, 1272, 242, 1265], [2033, 8, 2032, 9], [416, 3, 5, 2], [1283, 1278, 770, 1787]];
 
sub<GL(2,Integers(2040))|Gens>;
 

The image $H:=\rho_E(\Gal(\overline{\Q}/\Q))$ of the adelic Galois representation has level \( 2040 = 2^{3} \cdot 3 \cdot 5 \cdot 17 \), index $48$, genus $0$, and generators

$\left(\begin{array}{rr} 7 & 6 \\ 2034 & 2035 \end{array}\right),\left(\begin{array}{rr} 1 & 0 \\ 8 & 1 \end{array}\right),\left(\begin{array}{rr} 688 & 3 \\ 685 & 2 \end{array}\right),\left(\begin{array}{rr} 1 & 8 \\ 0 & 1 \end{array}\right),\left(\begin{array}{rr} 1 & 4 \\ 4 & 17 \end{array}\right),\left(\begin{array}{rr} 1076 & 2039 \\ 577 & 2034 \end{array}\right),\left(\begin{array}{rr} 1271 & 1272 \\ 242 & 1265 \end{array}\right),\left(\begin{array}{rr} 2033 & 8 \\ 2032 & 9 \end{array}\right),\left(\begin{array}{rr} 416 & 3 \\ 5 & 2 \end{array}\right),\left(\begin{array}{rr} 1283 & 1278 \\ 770 & 1787 \end{array}\right)$.

Input positive integer $m$ to see the generators of the reduction of $H$ to $\mathrm{GL}_2(\Z/m\Z)$:

The torsion field $K:=\Q(E[2040])$ is a degree-$57755566080$ Galois extension of $\Q$ with $\Gal(K/\Q)$ isomorphic to the projection of $H$ to $\GL_2(\Z/2040\Z)$.

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 $2$ \( 4335 = 3 \cdot 5 \cdot 17^{2} \)
$3$ split multiplicative $4$ \( 161840 = 2^{4} \cdot 5 \cdot 7 \cdot 17^{2} \)
$5$ split multiplicative $6$ \( 32368 = 2^{4} \cdot 7 \cdot 17^{2} \)
$7$ split multiplicative $8$ \( 69360 = 2^{4} \cdot 3 \cdot 5 \cdot 17^{2} \)
$17$ additive $162$ \( 1680 = 2^{4} \cdot 3 \cdot 5 \cdot 7 \)

Isogenies

gp: ellisomat(E)
 

This curve has non-trivial cyclic isogenies of degree $d$ for $d=$ 2 and 4.
Its isogeny class 485520ho consists of 4 curves linked by isogenies of degrees dividing 4.

Twists

The minimal quadratic twist of this elliptic curve is 3570x1, its twist by $-68$.

Iwasawa invariants

No Iwasawa invariant data is available for this curve.

$p$-adic regulators

$p$-adic regulators are not yet computed for curves that are not $\Gamma_0$-optimal.