Genus 2 curve 2873.a.48841.1

• Label: 2873.a.48841.1
• Conductor: $2873$
• Discriminant: $-48841$
• Mordell-Weil group: \(\Z\)
• 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

$y^2 + (x^3 + x + 1)y = 2x^4 + 2x^2 + x$

(, )

Invariants

Conductor:	\( N \)	\(=\)	\(2873\)	\(=\)	\( 13^{2} \cdot 17 \)
Discriminant:	\( \Delta \)	\(=\)	\(-48841\)	\(=\)	\( - 13^{2} \cdot 17^{2} \)

Igusa-Clebsch invariants

\( I_2 \)	\(=\)	\(828\)	\(=\)	\( 2^{2} \cdot 3^{2} \cdot 23 \)
\( I_4 \)	\(=\)	\(36777\)	\(=\)	\( 3 \cdot 13 \cdot 23 \cdot 41 \)
\( I_6 \)	\(=\)	\(8302203\)	\(=\)	\( 3^{3} \cdot 7 \cdot 13 \cdot 31 \cdot 109 \)
\( I_{10} \)	\(=\)	\(6251648\)	\(=\)	\( 2^{7} \cdot 13^{2} \cdot 17^{2} \)

Automorphism group

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

Rational points

All points
\((1 : 0 : 0)\)	\((1 : -1 : 0)\)	\((0 : 0 : 1)\)	\((0 : -1 : 1)\)	\((2 : 3 : 1)\)	\((2 : -14 : 1)\)
\((-1 : -15 : 4)\)	\((-1 : -32 : 4)\)

Number of rational Weierstrass points: \(0\)

This curve is locally solvable everywhere.

Mordell-Weil group of the Jacobian

Group structure: \(\Z\)

Generator	$D_0$						Height	Order
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\)	\(2x^2 + 4xz + z^2\)	\(=\)	\(0,\)	\(2y\)	\(=\)	\(3xz^2\)	\(0.011772\)	\(\infty\)

2-torsion field: 6.0.10816.1

BSD invariants

Hasse-Weil conjecture:	unverified
Analytic rank:	\(1\)
Mordell-Weil rank:	\(1\)
2-Selmer rank:	\(1\)
Regulator:	\( 0.011772 \)
Real period:	\( 16.83634 \)
Tamagawa product:	\( 2 \)
Torsion order:	\( 1 \)
Leading coefficient:	\( 0.396427 \)
Analytic order of Ш:	\( 1 \)   (rounded)
Order of Ш:	square

Local invariants

Prime	ord(\(N\))	ord(\(\Delta\))	Tamagawa	L-factor	Cluster picture
\(13\)	\(2\)	\(2\)	\(1\)	\(1 - T + 13 T^{2}\)
\(17\)	\(1\)	\(2\)	\(2\)	\(( 1 - T )( 1 + 3 T + 17 T^{2} )\)

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?
\(2\)	2.40.3	no
\(3\)	3.40.1	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 \(\Q\).