Genus 2 curve 100234.a.801872.1

• Label: 100234.a.801872.1
• Conductor: $100234$
• Discriminant: $801872$
• 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

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

(, )

Invariants

Conductor:	\( N \)	\(=\)	\(100234\)	\(=\)	\( 2 \cdot 23 \cdot 2179 \)
Discriminant:	\( \Delta \)	\(=\)	\(801872\)	\(=\)	\( 2^{4} \cdot 23 \cdot 2179 \)

Igusa-Clebsch invariants

\( I_2 \)	\(=\)	\(2096\)	\(=\)	\( 2^{4} \cdot 131 \)
\( I_4 \)	\(=\)	\(-1976\)	\(=\)	\( - 2^{3} \cdot 13 \cdot 19 \)
\( I_6 \)	\(=\)	\(-780241\)	\(=\)	\( - 7 \cdot 11 \cdot 10133 \)
\( I_{10} \)	\(=\)	\(3207488\)	\(=\)	\( 2^{6} \cdot 23 \cdot 2179 \)

Automorphism group

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

Rational points

Known points: \((1 : 0 : 0),\, (1 : -1 : 0),\, (2 : -3 : 1),\, (-2 : 5 : 1),\, (2 : -7 : 1),\, (-3 : 12 : 1),\, (-3 : 18 : 1)\)

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
\((2 : -7 : 1) - (1 : 0 : 0)\)	\(z (x - 2z)\)	\(=\)	\(0,\)	\(y\)	\(=\)	\(-x^3 + z^3\)	\(1.076362\)	\(\infty\)
\((-2 : 5 : 1) - (1 : 0 : 0)\)	\(z (x + 2z)\)	\(=\)	\(0,\)	\(y\)	\(=\)	\(-x^3 - 3z^3\)	\(0.116714\)	\(\infty\)

2-torsion field: 5.1.801872.1

BSD invariants

Hasse-Weil conjecture:	unverified
Analytic rank:	\(2\)
Mordell-Weil rank:	\(2\)
2-Selmer rank:	\(2\)
Regulator:	\( 0.125506 \)
Real period:	\( 5.600759 \)
Tamagawa product:	\( 2 \)
Torsion order:	\( 1 \)
Leading coefficient:	\( 1.405863 \)
Analytic order of Ш:	\( 1 \)   (rounded)
Order of Ш:	square

Local invariants

Prime	ord(\(N\))	ord(\(\Delta\))	Tamagawa	L-factor	Cluster picture
\(2\)	\(1\)	\(4\)	\(2\)	\(( 1 + T )( 1 + 2 T^{2} )\)
\(23\)	\(1\)	\(1\)	\(1\)	\(( 1 + T )( 1 + 6 T + 23 T^{2} )\)
\(2179\)	\(1\)	\(1\)	\(1\)	\(( 1 + T )( 1 - 88 T + 2179 T^{2} )\)

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 \(\Q\).