Listen for LightSail-1 – Transmissions Stopped

LightSail-1 with sail deployed - Credit Justin Foley KI6EPH

LightSail-1 with sail deployed – Credit Justin Foley KI6EPH

JoAnne Maenpaa K9JKM, AMSAT Vice-President User Services, reports that LightSail-1 has stopped transmitting on 437.435 MHz.

She says: Just read on-line at http://planet.ly/0gVop (Planetary Society) that the LightSail satellite stopped transmitting. The team is attempting a reboot.The telemetry data is sent on a downlink of 437.435 MHz, AX.25, 9600 bps FSK.

Excerpt from their page …
As of late Friday afternoon, LightSail was continuing to operate normally. The spacecraft’s ground stations at Cal Poly San Luis Obispo and Georgia Tech were receiving data on each pass. Power and temperature readings were trending stably, and the spacecraft was in good health.

But inside the spacecraft’s Linux-based flight software, a problem was brewing. Every 15 seconds, LightSail transmits a telemetry beacon packet. The software controlling the main system board writes corresponding information to a file called beacon.csv. If you’re not familiar with CSV files, you can think of them as simplified spreadsheets-in fact, most can be opened with Microsoft Excel.

As more beacons are transmitted, the file grows in size. When it reaches 32 megabytes-roughly the size of ten compressed music files-it can crash the flight system. The manufacturer of the avionics board corrected this glitch in later software revisions. But alas, LightSail’s software version doesn’t include the update.

Late Friday, the LightSail team received a heads-up warning them of the vulnerability. A fix was quickly devised to prevent the spacecraft from crashing, and it was scheduled to be uploaded during the next ground station pass. But before that happened, LightSail’s automated chirps fell silent. The last data packet received from the spacecraft was May 22 at 21:31 UTC (5:31 p.m. EDT).

A LightSail map tracking application is at http://sail.planetary.org/missioncontrol/

73 de JoAnne K9JKM
AMSAT VP User Services

LightSail-1 and other CubeSats Launch with X-37B https://amsat-uk.org/2015/05/20/lightsail-1-launch/

Keps for the CubeSats but which object corresponds to which satellite ?
https://docs.google.com/document/d/1o48dswYcTHb-op9ygaKhrizrelMGV9pYcUm0SFmxfS8/pub

LightSail-1 CubeSat Videos

Planetary Society’s LightSail-1 Spacecraft

 

The Planetary Society’s amateur radio spacecraft Lightsail-1 carries a 32m square metre solar sail demonstration.

After launch LightSail-1 will spend a few weeks in orbit during which the team will check out the subsystems. The side panels will then be deployed, exposing a folded sail, and a motor driven sail deployment will extend rigid booms.

With the sail deployed, the primary operation for the spacecraft are performing 90 degree slews to get the sail normal to the sun vector, or edge on with the sun vector.

A combination of ground based sensors and on board sensors will be used to characterize the acceleration due to solar pressure. Imagers on the deployed panels will be used to capture the sail deployment.

It is proposing to have a downlink in the 435 MHz band with a 1.5W output, semi-duplex 9k6 GMSK AX25 with a CW preamble to a single monopole. LightSail-1 is a 3U CubeSat weighing around 4.5 kg. More information will be available at http://polysat.calpoly.edu/LightSail.php

Watch deployment of the solar sail

Watch deployment of the solar panels

Watch antenna deployment in slow motion

The Planetary Society‘s LightSail program will launch three separate spacecraft over the course of several years, beginning with LightSail-1. Lightsail-2 will attempt a longer duration flight to higher Earth orbits, demonstrating that solar sails can increase their orbital energy and taking the next major step toward using solar sails for missions in and beyond Earth orbit.

LightSail-3 will fly to the Sun-Earth Libration Point, L1, where solar sail spacecraft could be permanently placed as solar weather stations, monitoring the geomagnetic storms from the Sun that potentially endanger electrical grids on Earth as well as satellites in Earth orbit.

Planetary Society LightSail-1 http://www.planetary.org/explore/projects/lightsail-solar-sailing/

Amateur Radio Spacecraft LightSail-1

Artists_impression_of_LightSail

Artists impression of LightSail - Image Credit Planetary Society

The amateur radio spacecraft LightSail-1 is a 32 square metre solar sail demonstrator.

The first full scale deployment of  the solar sail was conducted on March 4, 2011 at Stellar Exploration in San Luis Obispo, California. Read more

After launch LightSail-1 will spend a few weeks in orbit during which the team will check out the subsystems. The side panels will then be deployed, exposing a folded sail, and a motor driven sail deployment will extend rigid booms.

With the sail deployed, the primary operation for the spacecraft are performing 90 degree slews to get the sail normal to the sun vector, or edge on with the sun vector.

A combination of ground based sensors and on board sensors will be used to characterize the acceleration due to solar pressure. Imagers on the deployed panels are used to capture the sail deployment.

Proposing to have a downlink in the 435 MHz band with 1.5W output, semi-duplex 9k6 GMSK AX25 with a CW preamble to a single monopole. LightSail-1 is a 3U CubeSat weighing around 4.5 kg. More information will be available at http://polysat.calpoly.edu/LightSail.php

Watch LightSail-1 Video Update: Construction Begins!

The Planetary Society‘s LightSail program will launch three separate spacecraft over the course of several years, beginning with LightSail-1. Lightsail-2 will attempt a longer duration flight to higher Earth orbits, demonstrating that solar sails can increase their orbital energy and taking the next major step toward using solar sails for missions in and beyond Earth orbit.

LightSail-3 will fly to the Sun-Earth Libration Point, L1, where solar sail spacecraft could be permanently placed as solar weather stations, monitoring the geomagnetic storms from the Sun that potentially endanger electrical grids on Earth as well as satellites in Earth orbit.

Article LightSail-1 Nears Critical Design Review http://www.centauri-dreams.org/?p=12722

Centauri Dreams http://www.centauri-dreams.org/

Planetary Society – LightSail http://www.planetary.org/programs/projects/innovative_technologies/solar_sailing/multimission_project.html