PIONEER chronology |
PIONEER chronology |
Mar 3 2009, 11:51 PM
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#31
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Newbie Group: Members Posts: 15 Joined: 28-November 08 From: Germany Member No.: 4498 |
Have a look at http://en.wikipedia.org/wiki/Naming_of_moons#Jupiter
The table lists the names proposed for Jupiter VI to Jupiter XIII from the 50s to 70s. The name Amalthea for Jupiter V was apparently proposed by Camille Flammarion shortly after its discovery in 1892. References 10 and 13 link to two Icarus papers that should discuss the nomenclature issues, but I can´t access them ringt now. |
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Mar 4 2009, 10:17 AM
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#32
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Junior Member Group: Members Posts: 45 Joined: 18-July 05 Member No.: 439 |
OK, speaking about chronology again. Here's the list of Pioneer 10 Jupiter flyby events (planned).
Times are evidently Spacecraft Event Time (SCET), UTC. 1973 Dec 03 Tp-14h 00m = 12:26 - Callisto, 1392300 km Tp-12h 30m = 13:56 - Ganymede, 446250 lm Tp-07h 00m = 19:26 - Europa, 321000 km Tp-03h 30m = 22:56 - Io, 357000 km 1973 Dec 04 Tp-00h 00m = 02:26:00 - Pericenter, H=130000 km Tp+00h 10m = 02:36 - Equator plane crossing Tp+00h 15m 45s = 02:41:45 - Io occultation entry Tp+00h 17m 16s = 02:43:16 - Io occultation exit Tp+01h 16m 25s = 03:42:25 - Jupiter occultation entry Tp+01h 49m 35s = 04:15:35 - Jupiter shadow entry Tp+02h 21m 21s = 04:47:21 - Jupiter occultation exit Tp+02h 41m = 05:07 - Jupiter shadow exit Note: for that day, ET = UTC + 44.184 sec, and ERT = SCET + 45 min 55 sec. |
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Mar 4 2009, 10:28 AM
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#33
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Junior Member Group: Members Posts: 45 Joined: 18-July 05 Member No.: 439 |
And here's the list of Pioneer 11 Jupiter flyby events (planned).
Times are evidently Spacecraft Event Time (SCET), UTC. 1974 Dec 03 Tp-21h 00m = 08:21 - Callisto, 786500 km Tp-07h 12m = 22:09 - Ganymede, 692300 km 1974 Dec 04 Tp-02h 10m = 03:11 - Io, 314000 km Tp-01h 06m = 04:15 - Europa, 586700 km Tp-00h 20m 58s = 05:00:21 - Jupiter shadow entry Tp-00h 20m 18s = 05:01:01 - Jupiter occultation entry Tp-00h 00m = 05:21:19 - Pericenter, H=42828 km Tp+00h 12m 33s = 05:33:52 - Jupiter shadow exit Tp+00h 21m 44s = 05:43:03 - Jupiter occultation exit Tp+01h 08m = 22:29 - Amalthea, 127500 km Note: for that day, ET = UTC + 45.184 sec, and ERT = SCET + 41 min 40 sec. |
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Mar 4 2009, 10:53 AM
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#34
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Junior Member Group: Members Posts: 45 Joined: 18-July 05 Member No.: 439 |
Finally, the Pioneer 11 flyby of Saturn events (planned).
Times are evidently Spacecraft Event Time (SCET), UTC. No possibility to calculate the planned pericenter time from these data. 1979 Aug 27 Tp-128h 32m = 08:02 - Phoebe, 9453000 km 1979 Aug 29 Tp-82h 29m = 06:05 - Iapetus, 1039000 km 1979 Aug 31 Tp-28h 03m = 12:31 - Hyperion, 674000 km 1979 Sep 01 Tp-01h 59m = 14:35 - Descending node Tp-01h 25m = 15:09 - Approach to rings from below Tp-00h 30m = 16:04 - Dione, 291100 km Tp-00h 07m = 16:27 - Dione, 291100 km Tp-00h 00m = 16:34 - Pericenter, H=21400 km Tp+00h 01m 30s = 16:35 - Saturn occultation entry Tp+00h 02m = 16:35:57 - Saturn shadow entry Tp+01h 20m = 17:53:32 - Saturn occultation exit Tp+01h 21m = 17:54:47 - Saturn shadow exit Tp+01h 31m = 18:05 - Departure fron rings Tp+01h 54m = 18:28 - Tethys, 331700 km Tp+01h 59m = 18:33 - Ascending node Tp+01h 59m = 18:33 - Enceladus, 225200 km Tp+06h 00m = 22:34 - Rhea, 341900 km 1979 Sep 02 Tp+25h 30m = 18:05 - Titan, 356000 km Note: for that day, ET = UTC + 50.184 sec, and ERT = SCET + 86 min 21 sec. |
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Guest_PhilCo126_* |
Apr 23 2009, 10:05 AM
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#35
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Guests |
The decision to go for the "outside" option was taken in November 1977 so when did the Pioneer 11 controllers at NASA Ames Research Center made final adjustments to the trajectory?
March 1978? ... were there more adjustments later on? |
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Apr 23 2009, 06:42 PM
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#36
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Junior Member Group: Members Posts: 39 Joined: 26-March 09 From: Cornwall Member No.: 4697 |
According to my notes, there was a correction on 13 Jul 1978.
Can't find my source for this, but there was a NASA press release on 24 Jul that said that the final correction had been made. |
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Apr 23 2009, 07:43 PM
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#37
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
Robotic Exploration of the Solar System part 1 (page 146): "the final trim maneuver on 13 July 1978 that set up the outer ring-plane crossing..."
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Apr 24 2009, 12:21 AM
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#38
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Member Group: Members Posts: 340 Joined: 11-April 08 From: Sydney, Australia Member No.: 4093 |
Thanks Liss & all other for these beautiful timelines. I have taken the liberty to include them in the timelines on my website for Pioneer 10 and Pioneer 11 ... please let me know if you object to that.
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Guest_PhilCo126_* |
Apr 24 2009, 06:40 AM
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#39
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That's a great website Daniel ... and "Welcome to UMSF.com" gwiz ...
I wonder if NASA Ames will celebrate the 30th anniversary of the Pioneer 11 ( Pioneer Saturn ) flyby of the ringed world. For an article on that subject I've found another 1970s Pioneer checkout photo, which I'll post in the Pioneer Hardware topic of the subforum |
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Apr 25 2009, 01:52 AM
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#40
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Member Group: Members Posts: 340 Joined: 11-April 08 From: Sydney, Australia Member No.: 4093 |
I wonder if NASA Ames will celebrate the 30th anniversary of the Pioneer 11 ( Pioneer Saturn ) flyby of the ringed world. I sent a Twitter message (tweet) to AMES with that question. They have just answered: don't know myself, but can ask around. ... EDIT 29/04: another tweet came back: "I asked our news chief here at Ames about the Pioneer but he is not aware of any celebrations.". Anyway, I will try to create a historic simulation for the flyby. -------------------- |
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Apr 29 2009, 08:59 AM
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#41
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Member Group: Members Posts: 340 Joined: 11-April 08 From: Sydney, Australia Member No.: 4093 |
Pioneer 11 30 years ago ... now showing on my website at http://tinyurl.com/c6vopp
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Apr 29 2009, 10:35 AM
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#42
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
I realy enjoy your website
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Apr 30 2009, 03:21 AM
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#43
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Member Group: Members Posts: 340 Joined: 11-April 08 From: Sydney, Australia Member No.: 4093 |
After consulting JPL's NSSDC and Horizons websites, it seems that Saturn closest approach was at
01 Sep 1979 16:29:34 UTC at an altitude of 20,591 km (using a Saturn radius of 60,268 km). I will update my website in due course. -------------------- |
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Apr 30 2009, 04:35 PM
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#44
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Member Group: Members Posts: 340 Joined: 11-April 08 From: Sydney, Australia Member No.: 4093 |
I worked the Horizons system a bit more and get the following c/a times and distances. Most are pretty close to the timeline Liss provided, with the exception of Phoebe (arguably not a close approach in either scenario!). According to these numbers, the undiscovered near-miss moon would have been Epimetheus at a distance of 6676km ... or about 6 minutes 45 seconds, given their relative speed of 59,271km/h!
Disclaimer: Horizon states that the trajectory data are reconstructed to fit the observations and is thus probably not as accurate as trajectory data available for current missions. Nevertheless: CODE 1979-08-29 06:06:10 Iapetus closest approach (1,032,535km)
1979-08-29 11:53:33 Phoebe closest approach (13,713,574km) 1979-08-31 12:32:33 Hyperion closest approach (666,153km) 1979-09-01 14:50:55 Epimetheus closest approach (6,676km) 1979-09-01 15:59:30 Dione closest approach (291,556km) 1979-09-01 16:26:28 Mimas closest approach (104,263km) 1979-09-01 16:29:34 Saturn Flyby (altitude: 20,591km) 1979-09-01 16:51:11 Janus closest approach (228,988km) 1979-09-01 18:25:34 Tethys closest approach (329,197km) 1979-09-01 18:30:14 Enceladus closest approach (222,027km) 1979-09-01 22:15:27 Rhea closest approach (345,303km) 1979-09-02 18:00:33 Titan closest approach (362,962km) -------------------- |
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May 4 2009, 06:56 PM
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#45
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Junior Member Group: Members Posts: 45 Joined: 18-July 05 Member No.: 439 |
Thanks Liss & all other for these beautiful timelines. I have taken the liberty to include them in the timelines on my website for Pioneer 10 and Pioneer 11 ... please let me know if you object to that. No objections: essentially these are NASA timelines. |
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