Genus 2 curve 16130.a.161300.1

• Label: 16130.a.161300.1
• Conductor: $16130$
• Discriminant: $161300$
• Mordell-Weil group: \(\Z \oplus \Z\)
• Sato-Tate group: $\mathrm{USp}(4)$
• \(\End(J_{\overline{\Q}}) \otimes \R\): \(\R\)
• \(\End(J_{\overline{\Q}}) \otimes \Q\): \(\Q\)
• \(\End(J) \otimes \Q\): \(\Q\)
• \(\overline{\Q}\)-simple: yes
• \(\mathrm{GL}_2\)-type: no

Minimal equation

$y^2 + (x^3 + x)y = -2x^4 - x^3 + 5x^2 - 2x$

(, )

Invariants

Conductor:	\( N \)	\(=\)	\(16130\)	\(=\)	\( 2 \cdot 5 \cdot 1613 \)
Discriminant:	\( \Delta \)	\(=\)	\(161300\)	\(=\)	\( 2^{2} \cdot 5^{2} \cdot 1613 \)

Igusa-Clebsch invariants

\( I_2 \)	\(=\)	\(528\)	\(=\)	\( 2^{4} \cdot 3 \cdot 11 \)
\( I_4 \)	\(=\)	\(16128\)	\(=\)	\( 2^{8} \cdot 3^{2} \cdot 7 \)
\( I_6 \)	\(=\)	\(2087487\)	\(=\)	\( 3^{2} \cdot 231943 \)
\( I_{10} \)	\(=\)	\(645200\)	\(=\)	\( 2^{4} \cdot 5^{2} \cdot 1613 \)

Automorphism group

\(\mathrm{Aut}(X)\)	\(\simeq\)	$C_2$
\(\mathrm{Aut}(X_{\overline{\Q}})\)	\(\simeq\)	$C_2$

Rational points

Known points
\((1 : 0 : 0)\)	\((1 : -1 : 0)\)	\((0 : 0 : 1)\)	\((1 : 0 : 1)\)	\((-2 : 0 : 1)\)	\((1 : 0 : 2)\)
\((1 : -2 : 1)\)	\((2 : -4 : 1)\)	\((1 : -5 : 2)\)	\((2 : -6 : 1)\)	\((-2 : 10 : 1)\)	\((-1 : -1224 : 15)\)
\((-1 : 1450 : 15)\)

Number of rational Weierstrass points: \(1\)

This curve is locally solvable everywhere.

Mordell-Weil group of the Jacobian

Group structure: \(\Z \oplus \Z\)

Generator	$D_0$						Height	Order
\((0 : 0 : 1) - (1 : 0 : 0)\)	\(z x\)	\(=\)	\(0,\)	\(y\)	\(=\)	\(-x^3\)	\(0.103062\)	\(\infty\)
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\)	\(x^2 - xz - z^2\)	\(=\)	\(0,\)	\(y\)	\(=\)	\(-xz^2 - 2z^3\)	\(0.083370\)	\(\infty\)

2-torsion field: 5.1.25808.1

BSD invariants

Hasse-Weil conjecture:	unverified
Analytic rank:	\(2\)
Mordell-Weil rank:	\(2\)
2-Selmer rank:	\(2\)
Regulator:	\( 0.007930 \)
Real period:	\( 20.30341 \)
Tamagawa product:	\( 4 \)
Torsion order:	\( 1 \)
Leading coefficient:	\( 0.644105 \)
Analytic order of Ш:	\( 1 \)   (rounded)
Order of Ш:	square

Local invariants

Prime	ord(\(N\))	ord(\(\Delta\))	Tamagawa	L-factor	Cluster picture
\(2\)	\(1\)	\(2\)	\(2\)	\(( 1 + T )( 1 + 2 T^{2} )\)
\(5\)	\(1\)	\(2\)	\(2\)	\(( 1 - T )( 1 + 3 T + 5 T^{2} )\)
\(1613\)	\(1\)	\(1\)	\(1\)	\(( 1 - T )( 1 + 42 T + 1613 T^{2} )\)

Galois representations

The mod-$\ell$ Galois representation has maximal image \(\GSp(4,\F_\ell)\) for all primes \( \ell \) except those listed.

Prime \(\ell\)	mod-\(\ell\) image	Is torsion prime?
\(2\)	2.6.1	no

Sato-Tate group

\(\mathrm{ST}\)	\(\simeq\)	$\mathrm{USp}(4)$
\(\mathrm{ST}^0\)	\(\simeq\)	\(\mathrm{USp}(4)\)

Decomposition of the Jacobian

Simple over \(\overline{\Q}\)

Endomorphisms of the Jacobian

Not of \(\GL_2\)-type over \(\Q\)

Endomorphism ring over \(\Q\):

\(\End (J_{})\)	\(\simeq\)	\(\Z\)
\(\End (J_{}) \otimes \Q \)	\(\simeq\)	\(\Q\)
\(\End (J_{}) \otimes \R\)	\(\simeq\)	\(\R\)

All \(\overline{\Q}\)-endomorphisms of the Jacobian are defined over \(\Q\).