New Reference Trajectory
and
Upcoming Events
C. J. Hansen
10 January 2007
Tour Status
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S27 Sequence is executing, just started Rev 37
– Period = 16 days
– Inclination = 53.30
•
The s/c is in the middle of the series of 180 transfer orbits
– 22 July 2006 to 30 June 2007
– Rev 26 to Rev 47
•
Executing the new Reference Tour (060323)
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Titan altitude had to be raised for most Titan flybys
Project executed T21 nervously but all was well
T32 raised to 975 km (since cos(lat) doesn’t work to model atmos)
Worried about T36 - first southern hemisphere close flyby
Reference Tour Potential Tweaks
– Iapetus
• Improve viewing geometry for the Iapetus flyby
• Costs 14 m/sec (part of cost is preserving timing of subsequent activities)
– Enceladus solar occultation
• On the Mission Planning list to be considered (other candidates are raising T38,
any other Titan altitude raises, EN061)
180 Transfer Orbits
Titan Flybys in First Half of 2007
T23
13 Jan
1000 km
Radar, UVIS stellar occ
T24
29 Jan.
2631
ORS
T25
22 Feb.
1000
Radar
T26
10 March
980
UVIS Solar Occ, INMS
T27
26 March
1010
RSS Earth Occ
T28
10 April
990
Radar, VIMS
T29
26 April
980
Radar
T30
12 May
960
Radar
T31
28 May
2300
RSS Earth Occ
T32
13 June
975
UVIS solar occ ingress, INMS
Upcoming Icy Satellite Flybys
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Tethys
Methone
Mimas
Enceladus
Prometheus
Epimetheus
Rev 47
Rev 47
Rev 47
Rev 47
Rev 47
Rev 47
June 27
June 27
June 27
June 28
June 28
June 28
Saturn, Ring Occs start again
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Rings
Saturn, Rings
Saturn, Rings
Saturn, Rings
Saturn
Rev 43
Rev 44
Rev 45
Rev 46
Rev 47
April 24
May 10
May 26
June 11
June 27
15,851 km
12,636
91,806
90,671
41,930
92,984
Reference Trajectory Changes