Satellites de Saturne I à VIII : configurations pour 1987

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Satellites de Saturne I à VIII : configurations pour 1987

J.-E. Arlot, Th. Derouazi, Y. Jannot, Ch. Ruatti

To cite this version:

J.-E. Arlot, Th. Derouazi, Y. Jannot, Ch. Ruatti. Satellites de Saturne I à VIII : configurations pour

1987. [Rapport de recherche] Institut de mécanique céleste et de calcul des éphémérides(IMCCE).

1986, 33 p., figures, tableaux. �hal-01467654�

CONFIGURATIONS

DES HUIT

PREMIERS

SATELLITES

DE

SATURNE

POUR

1987

CONFIGURATIONS

OF THE

FIRST EIGHT

SATELLITES

OF

SATURN

FOR

1987

S u p p l é m e n t à Ia C o n n a i s s a n c e des Temps à l ’usage des o b s e r v a t e u r s . R é d a c t i o n et calculs: J.-E. A R L O T , Th. DEROUAZI, Y. JA N N O T , Ch. R U A T T I . Bu r e a u des Lo n g i t u d e s , 77 a v e n u e Denfert - R o c h e r e a u , F - 7 5 0 l 4 PARIS.

C o u v e r t u r e : 1fI n s t r u m e n t pour trouver les c o n f i g u r a t i o n s des S a t e l l i t e s de Saturne", extrait de Lalande 1792, A s t r o n o m i e tome 3 .

I m p r i m é au B u r e a u des Longitudes ISSN 0 7 6 9 - 1 0 2 5

I N T R O D U C T I O N

Le B u r e a u des L o n g i t u d e s publie chaque année d a n s Ia C o n n a i s s a n c e d es T e m p s r les p o s i t i o n s des p lanètes, du Soleil et de Ia Lune sous forme de c o e f f i c i e n t s de Tchéby- cheff. Des s u p p l é m e n t s à Ia Con n a i s s a n c e des T e m o s sont p u b l i é s ég a l e m e n t et donnent: -Ies pos i t i o n s des s a t e l l i t e s galiléens de Jupiter, des h u i t p r e m i e r s satellites de S a ­ turne et des c inq s a t e l l i t e s d ’Uranus sous forme de fonct i o n s m i x t e s d é p e n d a n t d i r e c t e ­ me n t du temps.

-Ies po s i t i o n s des s a t e l l i t e s faibles de J u ­ pi t e r (VI, VII, V III et IX) et de Phoebe

(satellite IX de Saturne) sous forme de c o e f ­ ficients de T c h é b y c h e f f .

-Ies c o n f i g u r a t i o n s et les phén o m è n e s des s a t e l l i t e s g a l i l é e n s de Jupiter.

Le p r é s e n t s u p p l é m e n t donne les c o n f i g u r a ­ tions des huit p r e m i e r s s a tellites de Sat u r n e dans Ie but, p r i n c i p a l e m e n t , d ’aider les o b s e r v a t e u r s à i d e n t i f i e r ces satellites. La pr é c i s i o n de lecture des courbes p e r m e t une p r é c i s i o n dans Ia p o s i t i o n de l'ordre de 10 à 15 secondes de degré (").

Th e B ureau d e s L o n g i t u d e s p u b l i s h e s e a c h year in the C o n n a i s s a n c e des T e m p s , the p o ­ sitions of the Planets, the Sun and the M o o n as C h e b y c h e v p o l y n o m i a l s . Sev e r a l s u p p l e m e n t s to the C o n n a i s s a n c e des T e m p s are a l s o p u b l i ­ shed and give:

-the p o s i t i o n s of the g a l i l e a n s a t e l l i t e s of Jupiter, of the fir s t e i g h t s a t e l l i t e s of S a ­

turn and of the five sate l l i t e s of U r a n u s as m i x e d functions d e p e n d i n g d i r e c t l y on the t i m e .

-the p o s i t i o n s of the faint s a t e l l i t e s of Jup i t e r (VI, VII, V I I I and IX), of P h o e b e (satellite IX of Saturn) as C h e b y c h e v p o l y ­ nomials .

-the c o n f i g u r a t i o n s and the p h e n o m e n a of the galil e a n s a t e l l i t e s of Jupiter.

The p r e s e n t s u p p l e m e n t g i v e s the c o n f i g u ­ rations of the f i rst e i g h t s a t e l l i t e s of S a ­ turn in order to h e l p the o b s e r v e r s to i d e n ­ tify t h o s e : s a t e l l i t e s . The p r e c i s i o n of the curves allows an a c c u r a c y in the p o s i t i o n of about 10 to 15 s e c o n d s of d e g r e e (” ).

-5-Name

Orbit

_____ (km)______

Orbit

(in Saturn

radii)

Satellites of Saturn

Period

Additional

Radius

(hrs)

Name___________ (km)______

Density

(gm/cc)

AIbedot

I980S28

137,670

2.82

14.446

A ring Shep.

10x20

—

0.4

1980S27

139,350

2.310

14.712

F Ring Shep.

70x50x40

—

0.6

1980S26

141,700

2.349

15.085

F Ring Shep.

55x45x35

—

0.6

1980S3

151,422

2.510

16.664

Trailing

70x60x50

—

0.4

Co-Orbital

1980S1

151,472

2.511

16.672

Leading

110x100x80

—

0.4

Co-Orbital

Mimas

185,540

3.075

22.618

S-I

196 ± 3

1.4 ± 0 .2

OJ

Enceladus

238,040

3.946

32.885

S-2

250 + 10

1.2 ± 0 .4

1.0

Tethys

294,670

4.884

45.307

____________

SO

_____________

3 5 0 ± 1 0

1 .2 1 + 0 .1 6

0.8

1980S13

294,670

4.884

45.307

Lagrangian

17x14x13

—

0.6

1980S2S

294,670

4.884

45.307

Lagrangian

17x11x11

____________ — _____________

0.8

Dione

377,420

6.256

65.686

S+I

560 ± 5

1.43 ± 0 .0 6

0.6

1980S6

378,060

6.267

65.686

Lagrangian

18x16x15

____________ — _____________

0.5

Rhea

527,100

8.737

108.42

S-5

7 6 5 + 5

1.34 ± 0 .0 9

0.6

Titan

1,221,860

20.253

382.69

S-6

2575 ± 2

1 .8 8 + 0 .0 1

0.2

Hyperion

1,481,000

24.550

510.64

S-7

205x130x110

—

0.2

Iapetus

3,560,800

59.022

1903.94

S-8

730 ± 10

1.16 ± 0 .0 9

0.5,

0.05

Phoebe

12,954,000

214.7

13210.8

S-9

110 + 10

—

0.06

fA lb e d o is th e fr a c tio n o f incident IiKht which is reJlccted b y the body.

Mereury/November-December 1981

. T h e N e w S a t u r n S y s t e m ( D a v i d M o r r i s o n ).

o ; C o n f i g u r a t i o n s are given for S-I to S-8.

N o t e t h a t S - 1 , S - 2 , S - 3 , S - 4 , S - 5 , S - 6 , S - 7 , S - 8 a r e a l s o d e n o m i n a t e d

I, II, II I , I V , V , V I , V I I , V I I I ,

N a m e s of the r e c e n t l y d i s c o v e r e d satellites:

1980S28 : A t las, XV or S-15

1980S27 : P r o m e t h e u s , XVI or S-16

19 80S26 : Pa n d or a, X V I I or S-17

19 80Sl : Janus, X or S-10

19 80S3 : E p i m e t h e u s , XI or S-Il

1 9 8 0 S l 3 : T e l e s t o , X I I I or S-13

1 9 8 0 S 1 4 : C a l yp so , X I V or :S-14

1980S6 : He l e n e , XII or S-12.

-6-T H E

USE

OF

T H E

C O N F I G U R A T I O N S

The c o n f i g u r a t i o n s a l l o w the i d e n t i f i c a t i o n of the satellites

a n d the d e t e r m i n a t i o n of t h ei r p o s i t i o n in t a n g e n t i a l e q u a t o r i a l

c o o r d i n a t e s r e f e r r e d to the p la n e t S a t u r n w i t h the p r e c i s i o n as

f o l l o w (for a l e c t u r e on the c ur v e s w i t h an a c c u r a c y of 0.5 m i l l i ­

m et e r ) :

S-I

: 2 to 10"

S-5 : 2 to 3"

S-2

: 2 to 8"

S-6 : 2"

S-3

:

2 to 6"

S-7 :

2"

S-4

: 2 tc 4"

S-8 : 2"

T h i s e x a m p l e shows ho w to p r o c e e d :

l 1

DflNS LE SENS OUEST-EST.LES SflTELLITES PflSSENT flU-0ELfl !0E SflTURNE

■; SUD

N U R D

O R B I T E S RPP flRENTES

The d i s t a n c e s Aa cos 6 , m e a s u r e d on the c u r v e s for

the c h o o s e n da t e , are p l o t t e d in a b s c i s s a on w e s t - e a s t axis .

T h e o r d i n a t e is g i v e n by the a p p a r e n t orbits. Th e d i r e c t i o n of

the r o t a t i o n i n d i c a t e s if the s a t e l l i t e is b e f o r e or b e h i n d the

p l a n e t on its orbit.

-7-U S A G E

D E S

C O N F I G U R A T I O N S

L e s c o n f i g u r a t i o n s p e r m e t t e n t d ' i d e n t i f i e r les s a t e l l i t e s

et de d é t e r m i n e r l e u r p o s i t i o n en c o o r d o n n é e s t a n g e n t i e l l e s é q u a t o ­

r ia l e s r e l a t i v e s à S a t u r n e avec Ia p r é c i s i o n s u i v a n t e (pour une

l e c t u r e des c o u r b e s à 0,5 m i l l i m è t r e près) :

S-I : 2 à

10"

_{S-5 : 2 à 3"}

S-2 : 2 à

8"

S-6 : 2"

S-3 ':

2 à

6"

_{S-7 : 2"}

S - iI : 2 à

iI"

S-8 : 2"

L ' e x e m p l e s u i v an t m o n t r e c omment p r o c é d e r :

DflNS LE SENS OUESI-EST,LES ,SRTELLITES PRSSENT RU-DELfl DE SflTURNE

Nt

ORD

O R B I T E S RPPflRENTES

On r e p o r t e en a b s c i s s e sur l'axe o u e s t - e s t les d i s t a n c e s

A a cos 6 m e s u r é e s , p o u r Ia d at e voulue, sur les c ou r b e s . L ' o r d o n n é e

est d o n n é e pa r les o r b i t e s a p p a re nt es . L ' i n d é t e r m i n a t i o n a v a n t / a r r i è r

est le v é e gr â c e au sens de r o t a t i o n des satellites.

-

10

-1 9 8 7 .- C O N F IGURflTIONS D E S SflTELLI TE S DE SflTURNE

JflNVIER

- P R E M I E R E Q U I N ZflINE

0UES,T

8

0

.

0^

-0

2

6 6 S-S - I 3.0

.0

W o

.0

S - 8 S - 6 S — 4

8.0

.0

.0 S - 5 0 S - 3 .0 S - 7 .0 .0 .0 0

OflNS LE S E N S 0 U E S T - E S T , L E S S A T E L L I T E S P A S S E N T A U - D E L A

DE S R T U R N E

SJJD

NtO R D

O R B I T E S f l P P R R E N T E S

-

Ii

-1 9 8 7 . - C O N F I G U R f l T I O N S D E S S H T E L L I T E S D E SflTURNE

JflNVIER

- D E U X I E M E Q U I N Z f l I N E

S - 6

s-7

S-2 S-2 . Û S - 3

25.0

26.0

S - I <' 2 8 .u

29.0

30.0

DfiNS LE SENS O U E S T - E S T tLES SATELLITES PASSENT AU-DELA DE SATURNE

K Q R D '

« R B I T F S flPPflRENTES

12

-1 9 8 7 .- C O N F I G U R f l T I O N S D E S S A T E L L I T E S D E Sfl T U R N E

F E V R I E R

- P R E M I E R E Q U I N Z f l I N E

O U E S J

8

2 .

S-3.

S - 3

S - 4 5. 7. _{S - 6}

8

.

-2

9. 1 1

.

1 2 . 13.

S-1<

16.

DflNS LE SENS OUES T - E S T f LES SflTELLI TES PflSSEiNT RU-DELfl DE SflTURNE

NJ3RD

13

-19 8 7 . - C G N F I G U R f l T I O N S D E S S A T E L L I T E S D E S A T U R N E

- D E U X I E M E Q U I N Z A I N E

S-4

S

-S - 7/

23.0

S - 3

S - 6

S - 2

25. 0

26.0

28.0

29.0

DfiNS LE SENS O U E S T - E S T tLES SfiTELLITES PfiSSENT RU-DELfl

DE SRTURNE

SiJD

NiDRD

14

-1 9 8 7 . - C O N F r G U R R T I O N S D E S S f l T E L L I T E S D E SflTU R N E

MflRS

- P R E M I E R E Q U I N Z f l I N E

S - 5

S - 7

S — 6) ; s - 4 S - 2 S -S - I

1 2 . 0

DRNS LE SENS O U E S T - E S T fLES SRTELLITES FRSSENT RU-DELfi

DE SfiTURNE

SiJD

NJ3RD

15

-19 8 7 . - C O N F I G U R f l T I O N S D E S S A T E L L I T E S D E S f l T U R N E

M A R S

- D E U X I E M E Q U I N Z A I N E

S - 4

S - 2

S - 6

20.0

— 22.0

2 4 . 0

26.0

2 8 . 0

2 9 . 0

S-3 0 . 0

ORNS LE SENS GUEST-EST,LES SRTELLITES PRSSENT RU-DELR DE SRTURNE

SJJD

16

-19 8 7 . - C O N F I G U R f l T I O N S Ü E S S f l T E L L I T E S DE SflTURNE

flVRIL

- P R E M I E R E Q U I N Z f l I N E

S - 4

S

S

-V

S - 2

S - 8

S - 7

S - I

16.0 —

DflNS LE SENS OU EST - E S T fLES SATELLITES PRSSENT flU-DELfl DE SflTURNE

NJ3RD

17

-19 8 7 . - C O N F I G U R R T I O N S D E S S A T E L L I T E S D E S A T U R N E

A V R I L

- D E U X I E M E Q U I N Z A I N E

1 6 . 0

18.0 19.0 S - 3 S - 7

20.0

S - 6

22.0

S - 4

2 4 . 0

S - 2 S - I

2 5 . 0

2 9 . 0

3 0 . 0

3 2 . 0

DflNS LE SENS G U E S T - E S T , L E S S A T E L L I T E S PflSSENT flU-DELA DE SflTURNE

18

-1 9 8 7 . - C O N F -1 G URflTIONS D E S S R T E L L I T E S DE S f lTURNE

O U E S 1T

8

MflI

2

- P R E M I E R E Q U I N Z f l I N E

O’

2

4’

E S T

8 S — 5 S - S - 4 S -'S-7 S - 3

DflNS LE SE N S O U E S T - E S T , l E S SfiTELLITES PfiSSENT flU-DELfi DE SfiTURNE

SiJD

NJ3RD

19

-19 8 7 . - C 0 N F I G U R f l T I O N S DES S A T E L L I T E S D E S A T U R N E '

M A I

- D E U X I E M E Q U I N Z A I N E

.

0

S-3

S - 4

S - 5

22 Ao S - 8 2 5 . 0 2 6 . 0 S - 7 2 8 . 0 S - 6 2 9 . 0 3 0 . 0 3 2 . 0 D R N S LE SENS 0 U E S T - E S T , L E S S R T E L L I T E S PRSSENT R U - D E L R DE S R T U R N E

S U Ü

N*QRD

O R B I T E S A P P A R E N T E S

-

20

-1 9 8 7 . - C G N F I G U R f l T I O N S D E S S R T E L L I T E S D E S R T U R N E

O U E S T

B

J U I N

2

- P R E M I E R E Q U I N Z R I N E

0

’

2

4

'

E S T

8 S - 4

-2

S — 3

1

1

S-1 1

1

OflNS LE S E N S O U E S T - E S T , L E S S A T E L L I T E S PflSSENT RU-DELfl OE SflTURNE

21

-1 9 8 7 .- C O N F I G U R f l T I O N S D E S S R T E L L I T E S DE S R T U R N E

J U I N

- D E U X I E M E Q U I N Z f l I N E

O U E S T

.

,

.

.

.

.

,

E1S T

S -- 3 S — 7 - 4 S

-DflNS LE SENS O U E S T - E S T . L E S SflTELLlTES PflSSENT flU-DELfl DE SflTURNE

NiDRD

22

-19 8 7 . - C O N F I G U R R T I O N S D E S S R T E L L I T E S D E S R T U R N E

J U I L L E T

- P R E M I E R E Q U I N Z R I N E

OUESJ

-8

S - 5 S - 3 S - 6 ) -7 1 1

1

OflNS LE SENS GUEST-EST,LES SATELLITES PflSSENT flU-DELfl DE SflTURNE

E S T

O U E S T

H O R O

23

-1 9 8 7 . - C O N F I G U R f l T I O N S D E S S R T E L L I T E S DE SflTURNE

J U I L L E T

- D E U X I E M E Q U I N Z f l I N E

s -22.0 S - 4 23. 0 S - 3 S - 6 S - 5 26. 0 27 . 0 2 9 . 0

S - 7

30.

D9NS LE SENS OUEST-EST,LES SflTELLITES PflSSENT flU-DELfl DE SRTURNE

SJJD

NJ3RD

2 4

-1 9 87. - C O N F IGURflT IONS D E S S A T E L L I T E S DE - S A T U R N E

A Q U T

- P R E M I E R E Q U I N Z A I N E

S-5

1

S -4

1

S-S - ô

1

S-7

1 1 1

Dfl,NS LE SENS C U E S T - E 5 T . L E S S H FELLITES PflSSENT AU-L fl DE SflTURNE

HflRD

25

-1 9 8 7 . - C O N F I G U R A T I O N S D E S S f i T E L L I T E S D E SfiTU R N E

fiöUT

- D E U X I E M E Q U I N Z f l I N E

S - 4

S-2

S - 7 22.0 S - 5 2 3.0 2 5.0

2 0 . 0

27.0 2 8.0 29.0 S -30.0

3 2 . 0

DfiNS LE SENS O U E S T - E S T fLES SfiTELLITES PfiSSENT fiU-DELfi DE SfiTURNE

26

-1 98 7 . - C O N F I G U R f l T I O N S D E S S f l T E L L I T E S DE SflTURNE

S E P T E M B R E - P R E M I E R E Q U I N Z f l I N E

S - 4 S -S - 5 S

-1 0 . 0

S - 7

1 2 . 0

13.0 15.0

DRNS LE SENS OUEST-EST,LES SRTELLITES FRSSENT RU-DELR DE SRTURNE

K D R D

27

-1 9 8 7 . - C O N F I G U R f l T I O N S O E S S f l T E L L I T E S D E SflTURNE

S E P T E M B R E - D E U X I E M E Q U I N Z f l I N E

S - 6 22.0 S - 5

S - 4

S - 2

£ 0 , 2 6.0 27 . 0 28.0 S - I 29 . 0

30.0

32.0

DRNS LE SENS OUE ST- EST,LES SRTELLITES PRSSENT RU-DELR DE SRTURNE

N4D R D

28

-19 8 7 . - C O N F IGURflTIONS D E S S A T E L L I T E S D E S A T U R N E

O C T O B R E

- P R E M I E R E Q U I N Z A I N E

S-6

S-I

s - a

1 0 . 0

S - 3

12.0 13.0

15.0

S - 5

S - 7

DRNS LE SENS GUES7-EST,LES SRTELLITES PRSSENT RU-DELR DE SRTURNE

NJDRD

29

-1 98 7 . - C O N F I G U R f l T I O N S D E S S R T E L L I T E S D E S R T U R N E

Q C T 0 B R E

- D E U X I E M E Q U I N Z R I N E

OUES,T

.

,

, .

,

.

,

,

. E.ST

S - 4

S-6

22.0

23.0

S

-25.0

S — 7

26.0

28.0

29.0

30.0

D 0 N S L E S E N S G U E S T - E S T , L E S S R T E L L I T E S P R S S E M i R U - D E L R

D E S R T U R N E

a u D

NJ3RD

O R B I T E S R P P R R E N T E S

3 0

-1 9 8 7 .- C O N F I G U R R T I O N S D E S S A T E L L I T E S DE S A T U R N E

0UES,T

8

N Q V E M B R E - P R E M I E R E Q U I N Z A I N E

Z

o’

Z

4

ES.T

8

S-4|

S-8

S-IC

-6

S-5

S-2

:><

S - 7

14.0

OfiNS LE S E N S O U E S T - E S T , L E S SflTELL I T E S PflSSENT A U - O E L A

DE S R T U R N 1E

auD

31

-1 9 8 7 . - C O N F I G U R R T I O N S D E S S f l T E L L l T E S D E SflTURNE

N O V E M B R E

- D E U X I E M E Q U I N Z f l I N E

2 2 . 0

S-6

25.0

_{b ^ 5 ^}

S-4

26.0

S - 3

S - 2

28.0

30.0

OfiNS LE S E N S O U E S T - E S T tL E S Sfi TELLITES PfiSSENT flU-DELfi

OE SfiTURNE

SiJD

NftRD

32

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G R B I T E S RPPflRENTES

33

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