io-orb-all.xml
8.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
<?xml version="1.0" encoding="UTF-8"?>
<Spase xmlns="http://www.spase-group.org/data/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.spase-group.org/data/schema http://www.spase-group.org/data/schema/spase-2_3_1.xsd">
<Version>2.3.1</Version>
<NumericalData>
<ResourceID>spase://CNES/NumericalData/CDPP-AMDA/Ephemerides/io-orb-all</ResourceID>
<ResourceHeader>
<ResourceName>Io</ResourceName>
<ReleaseDate>2018-10-14T11:46:29Z</ReleaseDate>
<Description>Io orbits Jupiter at a distance of 421,700 km from Jupiter's center and 350,000 km from its cloudtops. It is the innermost of the Galilean satellites of Jupiter, its orbit lying between those of Thebe and Europa.
Including Jupiter's inner satellites, Io is the fifth moon out from Jupiter. It takes Io about 42.5 hours to complete one orbit around Jupiter. Io is in a 2:1 mean-motion orbital resonance with Europa and a 4:1 mean-motion orbital resonance with Ganymede, completing two orbits of Jupiter for every one orbit completed by Europa, and four orbits for every one completed by Ganymede. This resonance helps maintain Io's orbital eccentricity (0.0041), which in turn provides the primary heating source for its geologic activity. Without this forced eccentricity, Io's orbit would circularize through tidal dissipation, leading to a geologically less active world.
Like the other Galilean satellites and the Moon, Io rotates synchronously with its orbital
period, keeping one face nearly pointed toward Jupiter. This synchronicity provides the
definition for Io's longitude system. Io's prime meridian intersects the equator at the
sub-Jovian point. The side of Io that always faces Jupiter is known as the subjovian
hemisphere, whereas the side that always faces away is known as the antijovian hemisphere.
The side of Io that always faces in the direction that Io travels in its orbit is known as
the leading hemisphere, whereas the side that always faces in the opposite direction is known
as the trailing hemisphere.</Description>
<Contact>
<PersonID>spase://CNES/Person/NAIF</PersonID>
<Role>PrincipalInvestigator</Role>
</Contact>
<Association>
<AssociationID>jup-moons-orb</AssociationID>
<AssociationType>PartOf</AssociationType>
<Note>Jupiter Moons</Note>
</Association>
</ResourceHeader>
<AccessInformation>
<RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
<Availability>Online</Availability>
<AccessRights>Open</AccessRights>
<AccessURL>
<URL>http://amda.cdpp.eu</URL>
</AccessURL>
<Format>Text.ASCII</Format>
</AccessInformation>
<ProviderName>SPICE</ProviderName>
<InstrumentID>spase://CDPP/Instrument/AMDA/Ephemerides</InstrumentID>
<MeasurementType>Ephemeris</MeasurementType>
<TemporalDescription>
<TimeSpan>
<StartDate>1970-01-01T00:00:05Z</StartDate>
<StopDate>2036-12-31T23:40:04Z</StopDate>
</TimeSpan>
<Cadence>PT20M</Cadence>
</TemporalDescription>
<ObservedRegion>Jupiter</ObservedRegion>
<ObservedRegion>Jupiter.Io</ObservedRegion>
<Parameter>
<Name>distance io-jupiter</Name>
<ParameterKey>io_jup_r</ParameterKey>
<Ucd/>
<Units>Rj</Units>
<RenderingHints>
<DisplayType>TimeSeries</DisplayType>
</RenderingHints>
<Support>
<SupportQuantity>Positional</SupportQuantity>
</Support>
</Parameter>
<Parameter>
<Name>xyz_jsm</Name>
<ParameterKey>io_jup_jsm</ParameterKey>
<Ucd/>
<Units>Rj</Units>
<CoordinateSystem>
<CoordinateRepresentation>Cartesian</CoordinateRepresentation>
<CoordinateSystemName>JSM</CoordinateSystemName>
</CoordinateSystem>
<RenderingHints>
<DisplayType>TimeSeries</DisplayType>
</RenderingHints>
<Structure>
<Size>3</Size>
<Element>
<Name>x</Name>
<Index>1</Index>
<ParameterKey>io_jup_jsm(0)</ParameterKey>
</Element>
<Element>
<Name>y</Name>
<Index>2</Index>
<ParameterKey>io_jup_jsm(1)</ParameterKey>
</Element>
<Element>
<Name>z</Name>
<Index>3</Index>
<ParameterKey>io_jup_jsm(2)</ParameterKey>
</Element>
</Structure>
<Support>
<SupportQuantity>Positional</SupportQuantity>
</Support>
</Parameter>
<Parameter>
<Name>xyz_jso</Name>
<ParameterKey>io_jup_jso</ParameterKey>
<Ucd/>
<Units>Rj</Units>
<CoordinateSystem>
<CoordinateRepresentation>Cartesian</CoordinateRepresentation>
<CoordinateSystemName>JSO</CoordinateSystemName>
</CoordinateSystem>
<RenderingHints>
<DisplayType>TimeSeries</DisplayType>
</RenderingHints>
<Structure>
<Size>3</Size>
<Element>
<Name>x</Name>
<Index>1</Index>
<ParameterKey>io_sat_jso(0)</ParameterKey>
</Element>
<Element>
<Name>y</Name>
<Index>2</Index>
<ParameterKey>io_jup_jso(1)</ParameterKey>
</Element>
<Element>
<Name>z</Name>
<Index>3</Index>
<ParameterKey>io_jup_jso(2)</ParameterKey>
</Element>
</Structure>
<Support>
<SupportQuantity>Positional</SupportQuantity>
</Support>
</Parameter>
<Parameter>
<Name>xyz_IAU_jupiter</Name>
<ParameterKey>io_jup_xyz</ParameterKey>
<Ucd/>
<Units>Rj</Units>
<CoordinateSystem>
<CoordinateRepresentation>Cartesian</CoordinateRepresentation>
<CoordinateSystemName>IAU_Jupiter</CoordinateSystemName>
</CoordinateSystem>
<RenderingHints>
<DisplayType>TimeSeries</DisplayType>
</RenderingHints>
<Structure>
<Size>3</Size>
<Element>
<Name>x</Name>
<Index>1</Index>
<ParameterKey>io_jup_xyz(0)</ParameterKey>
</Element>
<Element>
<Name>y</Name>
<Index>2</Index>
<ParameterKey>io_jup_xyz(1)</ParameterKey>
</Element>
<Element>
<Name>z</Name>
<Index>3</Index>
<ParameterKey>io_jup_xyz(2)</ParameterKey>
</Element>
</Structure>
<Support>
<SupportQuantity>Positional</SupportQuantity>
</Support>
</Parameter>
<Parameter>
<Name>latitude IAU_jupiter</Name>
<ParameterKey>io_jup_lat</ParameterKey>
<Ucd/>
<Units>deg</Units>
<Support>
<SupportQuantity>Positional</SupportQuantity>
</Support>
</Parameter>
<Parameter>
<Name>longitude IAU_jupiter</Name>
<ParameterKey>io_jup_lon</ParameterKey>
<Ucd/>
<Units>deg</Units>
<Support>
<SupportQuantity>Positional</SupportQuantity>
</Support>
</Parameter>
</NumericalData>
</Spase>