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Properties

Label 40.48.1.ba.1
Level $40$
Index $48$
Genus $1$
Analytic rank $0$
Cusps $8$
$\Q$-cusps $0$

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Invariants

Level: $40$ $\SL_2$-level: $8$ Newform level: $64$
Index: $48$ $\PSL_2$-index:$48$
Genus: $1 = 1 + \frac{ 48 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 8 }{2}$
Cusps: $8$ (none of which are rational) Cusp widths $4^{4}\cdot8^{4}$ Cusp orbits $2^{4}$
Elliptic points: $0$ of order $2$ and $0$ of order $3$
Analytic rank: $0$
$\Q$-gonality: $2$
$\overline{\Q}$-gonality: $2$
Rational cusps: $0$
Rational CM points: none

Other labels

Cummins and Pauli (CP) label: 8F1
Rouse, Sutherland, and Zureick-Brown (RSZB) label: 40.48.1.304

Level structure

$\GL_2(\Z/40\Z)$-generators: $\begin{bmatrix}23&16\\16&39\end{bmatrix}$, $\begin{bmatrix}29&8\\4&1\end{bmatrix}$, $\begin{bmatrix}33&38\\20&9\end{bmatrix}$, $\begin{bmatrix}37&4\\20&23\end{bmatrix}$, $\begin{bmatrix}37&22\\4&27\end{bmatrix}$
Contains $-I$: yes
Quadratic refinements: 40.96.1-40.ba.1.1, 40.96.1-40.ba.1.2, 40.96.1-40.ba.1.3, 40.96.1-40.ba.1.4, 40.96.1-40.ba.1.5, 40.96.1-40.ba.1.6, 40.96.1-40.ba.1.7, 40.96.1-40.ba.1.8, 40.96.1-40.ba.1.9, 40.96.1-40.ba.1.10, 40.96.1-40.ba.1.11, 40.96.1-40.ba.1.12, 40.96.1-40.ba.1.13, 40.96.1-40.ba.1.14, 40.96.1-40.ba.1.15, 40.96.1-40.ba.1.16, 120.96.1-40.ba.1.1, 120.96.1-40.ba.1.2, 120.96.1-40.ba.1.3, 120.96.1-40.ba.1.4, 120.96.1-40.ba.1.5, 120.96.1-40.ba.1.6, 120.96.1-40.ba.1.7, 120.96.1-40.ba.1.8, 120.96.1-40.ba.1.9, 120.96.1-40.ba.1.10, 120.96.1-40.ba.1.11, 120.96.1-40.ba.1.12, 120.96.1-40.ba.1.13, 120.96.1-40.ba.1.14, 120.96.1-40.ba.1.15, 120.96.1-40.ba.1.16, 280.96.1-40.ba.1.1, 280.96.1-40.ba.1.2, 280.96.1-40.ba.1.3, 280.96.1-40.ba.1.4, 280.96.1-40.ba.1.5, 280.96.1-40.ba.1.6, 280.96.1-40.ba.1.7, 280.96.1-40.ba.1.8, 280.96.1-40.ba.1.9, 280.96.1-40.ba.1.10, 280.96.1-40.ba.1.11, 280.96.1-40.ba.1.12, 280.96.1-40.ba.1.13, 280.96.1-40.ba.1.14, 280.96.1-40.ba.1.15, 280.96.1-40.ba.1.16
Cyclic 40-isogeny field degree: $12$
Cyclic 40-torsion field degree: $192$
Full 40-torsion field degree: $15360$

Jacobian

Conductor: $2^{6}$
Simple: yes
Squarefree: yes
Decomposition: $1$
Newforms: 64.2.a.a

Models

Embedded model Embedded model in $\mathbb{P}^{3}$

$ 0 $ $=$ $ 5 x y - 5 y^{2} + 4 z^{2} $
$=$ $10 x^{2} - 10 x y - 10 y^{2} + 8 z^{2} + w^{2}$
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Singular plane model Singular plane model

$ 0 $ $=$ $ x^{4} - 10 x^{2} y^{2} - 25 z^{4} $
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Rational points

This modular curve has real points and $\Q_p$ points for $p$ not dividing the level, but no known rational points.

Maps between models of this curve

Birational map from embedded model to plane model:

$\displaystyle X$ $=$ $\displaystyle y$
$\displaystyle Y$ $=$ $\displaystyle \frac{1}{10}w$
$\displaystyle Z$ $=$ $\displaystyle \frac{2}{5}z$

Maps to other modular curves

$j$-invariant map of degree 48 from the embedded model of this modular curve to the modular curve $X(1)$ :

$\displaystyle j$ $=$ $\displaystyle \frac{1}{2^4}\cdot\frac{(8z^{2}-4zw+w^{2})^{3}(8z^{2}+4zw+w^{2})^{3}}{w^{4}z^{8}}$

Modular covers

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Cover information

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This modular curve minimally covers the modular curves listed below.

Covered curve Level Index Degree Genus Rank Kernel decomposition
8.24.1.d.1 $8$ $2$ $2$ $1$ $0$ dimension zero
40.24.0.e.1 $40$ $2$ $2$ $0$ $0$ full Jacobian
40.24.0.m.1 $40$ $2$ $2$ $0$ $0$ full Jacobian

This modular curve is minimally covered by the modular curves in the database listed below.

Covering curve Level Index Degree Genus Rank Kernel decomposition
40.96.1.bi.1 $40$ $2$ $2$ $1$ $0$ dimension zero
40.96.1.bi.2 $40$ $2$ $2$ $1$ $0$ dimension zero
40.96.1.bk.1 $40$ $2$ $2$ $1$ $0$ dimension zero
40.96.1.bk.2 $40$ $2$ $2$ $1$ $0$ dimension zero
40.96.1.bm.1 $40$ $2$ $2$ $1$ $0$ dimension zero
40.96.1.bm.2 $40$ $2$ $2$ $1$ $0$ dimension zero
40.96.1.bo.1 $40$ $2$ $2$ $1$ $0$ dimension zero
40.96.1.bo.2 $40$ $2$ $2$ $1$ $0$ dimension zero
40.240.17.bq.1 $40$ $5$ $5$ $17$ $5$ $1^{14}\cdot2$
40.288.17.dc.1 $40$ $6$ $6$ $17$ $3$ $1^{14}\cdot2$
40.480.33.gs.1 $40$ $10$ $10$ $33$ $9$ $1^{28}\cdot2^{2}$
120.96.1.ey.1 $120$ $2$ $2$ $1$ $?$ dimension zero
120.96.1.ey.2 $120$ $2$ $2$ $1$ $?$ dimension zero
120.96.1.fa.1 $120$ $2$ $2$ $1$ $?$ dimension zero
120.96.1.fa.2 $120$ $2$ $2$ $1$ $?$ dimension zero
120.96.1.fc.1 $120$ $2$ $2$ $1$ $?$ dimension zero
120.96.1.fc.2 $120$ $2$ $2$ $1$ $?$ dimension zero
120.96.1.fe.1 $120$ $2$ $2$ $1$ $?$ dimension zero
120.96.1.fe.2 $120$ $2$ $2$ $1$ $?$ dimension zero
120.144.9.fe.1 $120$ $3$ $3$ $9$ $?$ not computed
120.192.9.dg.1 $120$ $4$ $4$ $9$ $?$ not computed
280.96.1.fg.1 $280$ $2$ $2$ $1$ $?$ dimension zero
280.96.1.fg.2 $280$ $2$ $2$ $1$ $?$ dimension zero
280.96.1.fi.1 $280$ $2$ $2$ $1$ $?$ dimension zero
280.96.1.fi.2 $280$ $2$ $2$ $1$ $?$ dimension zero
280.96.1.fk.1 $280$ $2$ $2$ $1$ $?$ dimension zero
280.96.1.fk.2 $280$ $2$ $2$ $1$ $?$ dimension zero
280.96.1.fm.1 $280$ $2$ $2$ $1$ $?$ dimension zero
280.96.1.fm.2 $280$ $2$ $2$ $1$ $?$ dimension zero