Properties

Label 140.120.4-20.a.1.3
Level $140$
Index $120$
Genus $4$
Cusps $4$
$\Q$-cusps $2$

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Invariants

Level: $140$ $\SL_2$-level: $20$ Newform level: $400$
Index: $120$ $\PSL_2$-index:$60$
Genus: $4 = 1 + \frac{ 60 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 4 }{2}$
Cusps: $4$ (of which $2$ are rational) Cusp widths $10^{2}\cdot20^{2}$ Cusp orbits $1^{2}\cdot2$
Elliptic points: $0$ of order $2$ and $0$ of order $3$
Analytic rank: not computed
$\Q$-gonality: $3 \le \gamma \le 4$
$\overline{\Q}$-gonality: $3 \le \gamma \le 4$
Rational cusps: $2$
Rational CM points: none

Other labels

Cummins and Pauli (CP) label: 20A4

Level structure

$\GL_2(\Z/140\Z)$-generators: $\begin{bmatrix}45&72\\66&75\end{bmatrix}$, $\begin{bmatrix}83&94\\130&57\end{bmatrix}$, $\begin{bmatrix}87&126\\18&13\end{bmatrix}$, $\begin{bmatrix}107&68\\66&73\end{bmatrix}$
Contains $-I$: no $\quad$ (see 20.60.4.a.1 for the level structure with $-I$)
Cyclic 140-isogeny field degree: $96$
Cyclic 140-torsion field degree: $4608$
Full 140-torsion field degree: $774144$

Models

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

$ 0 $ $=$ $ x^{2} + x y + 2 y^{2} + z w + w^{2} $
$=$ $x^{3} - x^{2} y - x z^{2} - x z w + x w^{2} - y z w$
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Rational points

This modular curve has 2 rational cusps but no known non-cuspidal rational points. The following are the known rational points on this modular curve (one row per $j$-invariant).

Elliptic curve CM $j$-invariant $j$-heightCanonical model
no$\infty$ $0.000$$(0:0:1:0)$, $(0:0:-1:1)$
32.a3 $-4$$1728$ $= 2^{6} \cdot 3^{3}$$7.455$$(-1:0:-2:1)$, $(1:0:-2:1)$

Maps to other modular curves

$j$-invariant map of degree 60 from the canonical model of this modular curve to the modular curve $X(1)$ :

$\displaystyle j$ $=$ $\displaystyle \frac{36016xyz^{8}+54304y^{2}z^{8}+16384z^{10}+69168xyz^{7}w+192224y^{2}z^{7}w+109072z^{9}w-223040xyz^{6}w^{2}-170176y^{2}z^{6}w^{2}+303152z^{8}w^{2}-603104xyz^{5}w^{3}-1979456y^{2}z^{5}w^{3}+295424z^{7}w^{3}+229840xyz^{4}w^{4}-3316480y^{2}z^{4}w^{4}-680864z^{6}w^{4}+1914848xyz^{3}w^{5}-695184y^{2}z^{3}w^{5}-2403008z^{5}w^{5}+1822912xyz^{2}w^{6}+2791136y^{2}z^{2}w^{6}-2362432z^{4}w^{6}+520832xyzw^{7}+2343744y^{2}zw^{7}+234496z^{3}w^{7}+520832y^{2}w^{8}+2024704z^{2}w^{8}+1310720zw^{9}+262144w^{10}}{7xyz^{8}+10y^{2}z^{8}+25xyz^{7}w+50y^{2}z^{7}w+5z^{9}w+41xyz^{6}w^{2}+74y^{2}z^{6}w^{2}+29z^{8}w^{2}+53xyz^{5}w^{3}+58y^{2}z^{5}w^{3}+59z^{7}w^{3}+35xyz^{4}w^{4}+30y^{2}z^{4}w^{4}+53z^{6}w^{4}+7xyz^{3}w^{5}-6y^{2}z^{3}w^{5}+17z^{5}w^{5}-7xyz^{2}w^{6}-16y^{2}z^{2}w^{6}-13z^{4}w^{6}-2xyzw^{7}-9y^{2}zw^{7}-16z^{3}w^{7}-2y^{2}w^{8}-4z^{2}w^{8}}$

Modular covers

The following modular covers realize this modular curve as a fiber product over $X(1)$.

Factor curve Level Index Degree Genus Rank
28.24.0-4.a.1.2 $28$ $5$ $5$ $0$ $0$
$X_{S_4}(5)$ $5$ $24$ $12$ $0$ $0$

This modular curve minimally covers the modular curves listed below.

Covered curve Level Index Degree Genus Rank
28.24.0-4.a.1.2 $28$ $5$ $5$ $0$ $0$
140.60.2-10.a.1.1 $140$ $2$ $2$ $2$ $?$
140.60.2-10.a.1.3 $140$ $2$ $2$ $2$ $?$

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

Covering curve Level Index Degree Genus
140.240.8-20.a.1.1 $140$ $2$ $2$ $8$
140.240.8-20.b.1.1 $140$ $2$ $2$ $8$
140.240.8-20.c.1.2 $140$ $2$ $2$ $8$
140.240.8-20.d.1.1 $140$ $2$ $2$ $8$
140.360.10-20.a.1.8 $140$ $3$ $3$ $10$
140.480.13-20.i.1.3 $140$ $4$ $4$ $13$
280.240.8-40.a.1.2 $280$ $2$ $2$ $8$
280.240.8-40.b.1.2 $280$ $2$ $2$ $8$
280.240.8-40.d.1.2 $280$ $2$ $2$ $8$
280.240.8-40.f.1.2 $280$ $2$ $2$ $8$
280.240.8-40.o.1.5 $280$ $2$ $2$ $8$
280.240.8-40.p.1.5 $280$ $2$ $2$ $8$
280.240.8-40.s.1.5 $280$ $2$ $2$ $8$
280.240.8-40.t.1.5 $280$ $2$ $2$ $8$
280.240.9-40.a.1.5 $280$ $2$ $2$ $9$
280.240.9-40.b.1.5 $280$ $2$ $2$ $9$
280.240.9-40.e.1.5 $280$ $2$ $2$ $9$
280.240.9-40.f.1.5 $280$ $2$ $2$ $9$
140.240.8-140.a.1.1 $140$ $2$ $2$ $8$
140.240.8-140.b.1.1 $140$ $2$ $2$ $8$
140.240.8-140.d.1.4 $140$ $2$ $2$ $8$
140.240.8-140.e.1.4 $140$ $2$ $2$ $8$
280.240.8-280.a.1.11 $280$ $2$ $2$ $8$
280.240.8-280.c.1.11 $280$ $2$ $2$ $8$
280.240.8-280.h.1.11 $280$ $2$ $2$ $8$
280.240.8-280.j.1.14 $280$ $2$ $2$ $8$
280.240.8-280.be.1.16 $280$ $2$ $2$ $8$
280.240.8-280.bf.1.15 $280$ $2$ $2$ $8$
280.240.8-280.bi.1.14 $280$ $2$ $2$ $8$
280.240.8-280.bj.1.12 $280$ $2$ $2$ $8$
280.240.9-280.a.1.7 $280$ $2$ $2$ $9$
280.240.9-280.b.1.14 $280$ $2$ $2$ $9$
280.240.9-280.e.1.16 $280$ $2$ $2$ $9$
280.240.9-280.f.1.16 $280$ $2$ $2$ $9$