ISEE-3: June 2014 Archives

Keith's 26 June Update: Just as our DSN window closed today we were able to get 2 way Doppler lock and ranging at a 47.5 kHz offset.  DSN got the four ranging points needed from ISEE-3. This is the first time since 1999 that DSN has talked to the spacecraft. A follow-up session tomorrow should get us a lot more recording time. Hats off to the DSN guys - especially the folks at DSS-24.

Keith's 27 June Update: We had an even greater DSN pass today with ISEE-3. We managed to get ~30 minutes of data (11 range points) after achieving 2 way Doppler lock and ranging at a 47.5 kHz offset.

ISEE-3 Status 24 June 2014: We Almost Did The Spin-up Burn

"During our session with Arecibo today we came very, very close to firing the thrusters on ISEE-3 for its spin-up maneuver. But we were not able to complete the process and fire the thrusters. The spacecraft was completely configured for a thruster firing during today's pass. We reduced the number of pulses from 11 to 1 to make certain that we had the proper commands in place. If that engine firing proceeded successfully we'd follow with the remaining 10 pulses so as to spin up the spacecraft to the required rotation rate. As it happened we were unable to get confirmation on the very last command and put a halt to the procedure."

Keith's note: We have another window opening at Arecibo around 1:30 pm EDT. We'll be live tweeting at @ISEE3Reboot.

Keith's Update: Our Arecibo pass was a short one and we had some commanding issues - so no spin-up burn. Our DSN pass for ranging starts at 4:50 pm EDT - you can see ISEE-3 listed on the DSN live page.

ISEE-3 Status Report 23 June 2014: DSN Ranging & Spin Up Update, ISEE-3 Reboot Project

"The DSN pass last week on 18 June that went from 1:45 to 2:45 Pacific Daylight time was not a success. Here is a recap of the pass activity. ... Friday June 20th we were going to do the propulsion system test and spin up maneuver. However, one of our pass/fail criterion was real time telemetry and reliable commanding. Neither of these criterion were met and thus we cancelled that activity early in the pass."

Are You Ready For Liftoff?, Forbes

"Once the ISEE-3 campaign was launched and promoted by Sky Corp and Space Ref Interactive, 2,238 supporters weighed in, raising $160, 000, $35,000 more than the project's goal. The project went from the improbable to the practical, and this is the transition on the forefront of every entrepreneurs mind. How can you do the same? ... Is this the path for you and your company? It could well be if you can meet the market with the thrust of the ISEE-3 campaign. If you can, your charity, reward or equity funding has a good chance of achieving liftoff."

ISEE-3 Status Report 19 June 2014 (afternoon)

Keep an eye on @ISEE3Reboot for updates

Keith's update: We had to scrub ISEE-3 spin-up burn for today. We can't confirm receipt of commands in real time by the spacecraft. If we cannot confirm that proper commands were sent to propulsion system we cannot fire thrusters with full confidence. Remember: this spacecraft does not have a computer. All 21 dummy commands worked - that should NOT have happened.  Next time we sent them only 3 were accepted. Investigating ...

Keith's note: If you go to the DSN NOW page you will see ISEE-3 (ICE) lined up ready for ranging at DSS-24 at Goldstone. Our ranging session starts at 1:45 pm PDT (4:45 pm EDT) and will last for an hour. We'll try and post real time updates on Twitter at @ISEE3Reboot

Keith's update: We did not have any luck establishing two-way communication between ISEE-3 and DSN today. We'll regroup and try again on Sunday. This does not affect our plan to do a short series of engine burns on 21 June (Saturday) to spin up the spacecraft.

- ISEE-3 Reboot Project Scheduled for DSN Doppler and Ranging Activity
- ISEE-3 Status Report 13 June 2014 - Green Light For Spin-up
- ISEE-3 Propulsion System Overview

ISEE-3 Reboot Project Scheduled for DSN Doppler and Ranging Activity

"We have received confirmation from NASA that we have been confirmed for time on the DSN (Deep Space Network) for two-way Doppler and ranging activities with the ISEE-3 spacecraft. This is being done so as to determine the location of ISEE-3 with great precision for navigation purposes. Based on this data we will conduct our course correction engine firing. We have moved that original firing date from 17 June to a window that currently covers 30 June and 2 July."

Calling Back a Zombie Ship From the Graveyard of Space, New York Times (front page story)

"After 36 years in space, the craft, the International Sun-Earth Explorer-3, appears to be in good working order. The main challenge, the engineers say, is figuring out how to command it. No one has the full operating manual anymore, and the fragments are sometimes contradictory."

- ISEE-3 Status Report 13 June 2014 - Green Light For Spin-up

"NASA has given us approval to fire the spin thrusters on ISEE-3 to increase its spin from 19.16 rpm up to the mission specification of 19.75 +/- 0.2 rpm."

- ISEE-3 Propulsion System Overview

ISEE-3 Reboot Project Is Already a Winner, editorial, Space News

"Inspiration is a word that gets bandied about a lot in the space business, often as justification for multibillion-dollar programs that never come to fruition, let alone inspire. ... Whatever the final outcome, the ISEE-3 Reboot Project has already succeeded in attracting an audience that the space community often has a hard time reaching. Credit the team, for having the vision and gumption to pull this off, and NASA, which hasn't always embraced these types of nontraditional endeavors. Together they have shown how prolific a little inspiration can be."

Detection of ISEE-3 With a 4.5 Meter Dish in Estonia

"Viljo Allik, ES5PC, a member of ESTCube-1 student satellite team at Tartu Observatory, Estonia writes: "I did some receiving experiments today, both on 2217.5 MHz LHCP and 2270.4 MHz RHCP. The RHCP carrier is a few dB-s stronger than LHCP. Up to 10 dB carrier to noise can be seen in 1Hz bandwidth with my 4.5 m moonbounce dish at home and G4DDK preamp."

HAM Operator Detection of ISEE-3 With an 8 Foot Dish

@eb3frn #ISEE3 4Hz in 30 minutes spin observed in the signal recorded today with doppler compensated.

How to Talk to a 36-year-old Space Probe (ISEE-3) with GNU Radio, a USRP, and a Big Dish, John Malsbury

As many of you have probably read, the ISEE-3 Reboot Project was able to successfully send uplink commands to the space craft. This was accomplished through a lot of team work, strong leadership by Dennis Wingo, and generous support from the community at large. Balint Seeber and I were fortunate enough to work on the communications for this project. When you tell most people that you designed a deep-space uplink modulator in a couple of days, there is a good chance that they will be fairly impressed.

"Communicating with a space probe using SDR: The @ISEE3Reboot Project" , presentation by Balint Seeber, Ettus Research (PDF)

This is the moment of First Contact with ISEE-3 last week at Arecibo. Austin Epps is on the left, Balint Seeber (doing the happy dance) is on the right. Dennis Wingo (on the phone) was up in the dome on the dish. Meanwhile, Keith was in his basement office answering media inquires while watching this all live via Skype, but he still took time out for his own happy dance.

Screengrab of today's ISEE-3 pass at Arecibo

ISEE-3 Status Report 5 June 2014 (Afternoon)

"We are doing a receive run - NOW - from Arecibo controlled via laptop from ISEE-3 Mission Control at McMoons in northern California. Taking data received on 29 May 2014, we have performed demodulation, error correction, and frame construction. Approximately 1,000 frames of telemetry have been received and processed. 773 Frames were received with no errors. More telemetry processing is currently underway."

ISEE-3 Status Report 5 June 2014 (Morning)

"We have received authorization from NASA to communicate with (and command) ISEE-3 until 25 June. Meanwhile, analysis of telemetry from ISEE- 3 shows that *ALL* of its science instruments are still powered on. Telemetry also shows that ISEE-3 has a power margin of +28 watts - after 36 years. It is important to note that ISEE-3 has not had a functioning battery for decades. Indeed, this power capacity is what was projected for the spacecraft to have had in 1982 after 4 years in space."

More information on the ISEE-3 Reboot Project

ISEE-3 Mission Status 3 June 2014

"Telemetry we have received from ISEE-3 shows that it is spinning at 19.16 rpm. The mission specification is 19.75 +/- 0.2 rpm. We have also learned that the spacecraft's attitude relative to the ecliptic is 90.71 degrees - the specification is 90 +/- 1.5 degrees. In addition, we are now receiving information from the spacecraft's magnetometer."

ISEE-3 Reboot Project Update: BULLSEYE! and More

"If we can maneuver the spacecraft by June 17th we get the very small delta V number for the maneuver above. However, this starts to climb rapidly as the spacecraft gets closer to the moon. Also we cannot at this time rule out a lunar impact. It is imperative that we get a ranging pass as soon as possible. We also need time to not only evaluate the health of the spacecraft, but to test the systems, the catalyst bed heaters for the propulsion system, the valve heaters, analyze the rest of the propulsion, power, and attitude control system as rapidly as possible. This will be a lot of commanding so we have to move into high gear next week."



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This page is an archive of entries in the ISEE-3 category from June 2014.

ISEE-3: May 2014 is the previous archive.

ISEE-3: July 2014 is the next archive.

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