Deorbit Sail – Image Credit Surrey Space Centre

Students and researchers at the Surrey Space Centre (SSC) in the University of Surrey, Guilford, are developing the 3U CubeSat Deorbitsail. It is planned to launch on a Dnepr rocket into a 600 km Low Earth Orbit (LEO).

The aims of the mission are:

(1) Deploy a large (5-by-5-metre) square Kapton sail.

(2) Deorbitsail is equipped with 3-axis-stabilizing attitude determination and control system. A novel capability of this system is pointing via Centre-Of-Mass / Centre-Of-Pressure (COM/COP) offset.

(3) The satellite will deorbit much more quickly than otherwise due to its deployable sail. Satellite pointing will be optimized by the attitude control system for maximum drag.

(4) The satellite will provide beacons which radio amateurs will be able to receive. The ISIS UHF/VHF radio will provide a 9600 bps BPSK downlink on 145.975 MHz.

DeorbitSail electronics stack – Image Credit DeorbitSail Consortium

For further information read DeOrbitSail Nanosatellite Mission
https://directory.eoportal.org/web/eoportal/satellite-missions/d/deorbitsail

DeorbitSail: A Spacecraft Mission to deploy sails in Space http://www.athena-spu.gr/projects/DeOrbit

Kapton https://en.wikipedia.org/wiki/Kapton

Deorbitsail: a deployable sail for de-orbiting by Olive R. Stohlman, University of Surrey and Vaios Lappas, University of Surrey http://arc.aiaa.org/doi/abs/10.2514/6.2013-1806

Inspection of a co-orbital solar sail using a microthruster attitude control system
http://surreyspacecentre.wordpress.com/2013/06/18/inspection-of-a-co-orbital-solar-sail-using-a-microthruster-attitude-control-system/

Open access to latest research output from Surrey Space Centre
https://amsat-uk.org/2013/06/19/open-access-to-ssc-research/

On Thursday, January 9 at 1807 UT an Antares rocket launched the Cygnus freighter carrying a cargo of CubeSats to the International Space Station.

There are four amateur radio CubeSats LituanicaSat-1, LitSat-1, ArduSat-2 and UAPSat-1. Also onboard is the 915 MHz CubeSat SkyCube and twenty eight 3U CubeSats from Planet Labs.

LituanicaSat-1 carries a 145/435 MHz FM transponder while LitSat-1 is thought to carry a 435/145  MHz linear transponder for SSB/CW communications.

It is expected the CubeSats will be deployed from the ISS in the coming months.

Planet Labs CubeSat Constellation

The IARU coordinated frequencies are listed as:

LituanicaSAT-1
• FM Transponder Uplink 145.950 MHz Downlink 435.180 MHz
• AX25 Uplink 145.850 MHz AX25 Downlink 437.550 MHz
• CW Beacon 437.275 MHz
Facebook https://www.facebook.com/Lituanicasat1

LitSat-1
• SSB Transponder Uplink 435.180 MHz Downlink 145.950 MHz
• AX25 Uplink 437.550 MHz Downlink 145.850 MHz
Facebook https://www.facebook.com/palydovas

ArduSat
•  9k6 MSK CCSDS data format downlink 437.? MHz
http://www.kickstarter.com/projects/575960623/ardusat-your-arduino-experiment-in-space

UAPSAT
• AX.25 Packet Radio uplink 145.980 MHz downlink 437.385 MHz

The Sun – Image Credit NASA SOHO

The high radiation level from recent solar eruptions has resulted in a planned launch of amateur radio CubeSats being postponed.

NASA’s Wallops Flight Facility say:

Early on Wednesday, January 8 the Antares launch team decided to scrub the launch attempt due to an unusually high level of space radiation that exceeded by a considerable margin the constraints imposed on the mission to ensure the rocket’s electronic systems are not impacted by a harsh radiation environment.

The solar flux activity that occurred late yesterday afternoon has had the result of increasing the level of radiation beyond what the Antares engineering team was monitoring earlier in the day. Overnight, Orbital engineers who are experts in the field ran numerous models to ensure that all possibilities to preserve the launch were examined. However, due to significantly elevated flux levels, the Antares team decided to postpone the launch to spend the day further examining the potential effects of the space radiation on the rocket’s avionics suite.

During Wednesday, in consultation with NASA and outside experts in the field of “space weather,” Orbital will continue to monitor the levels of space radiation with a goal of setting a new launch date as soon as possible. If we are able to launch on Thursday, the launch targeted launch time would be 1:10 p.m. (EST), with Cygnus arriving at the ISS Sunday morning, January 12.

Antares plans to ship a number of amateur radio CubeSats to the International Space Station (ISS) for later deployment. They include LituanicaSat-1, LitSat-1, ArduSat-2 andUAPSat-1. Also on the launch is the 915 MHz CubeSat SkyCube and twenty eight 3U CubeSats from Planet Labs.

UNSA-SAT1 hopes to be the first CubeSat to make use of the 3400 MHz ITU Amateur-Satellite Service allocation.

Built by students at the Instituto Astronómico y Aeroespacial Pedro Paulet in Peru, UNSA-SAT1 is a 2U spacecraft (20x10x10cm) which will be part of the QB50 constellation of 50 CubeSats.

The aims of this CubeSat include: upper atmosphere science; radio communication experiments; technology demonstrator; education, training and outreach.

The team are proposing a 435 MHz transceiver using BPSK and additional transmitters on 2.4 GHz,and 5.8 GHz. They also also hope to have a 230 kbps BPSK downlink on 3.4 GHz – this will only operate in Region 2 when the spacecraft is overhead the groundstation in Peru.

The ITU Amateur-Satellite allocation at 3400-3410 MHz is available in ITU Regions 2 and 3 but not currently in Region 1 (Europe/Africa) although it is believed Denmark and Norway have allocated the band to the Amateur-Satellite Service.

QB50: Amateur Radio transponder payloads to launch 2014
https://amsat-uk.org/2013/07/20/qb50-amateur-radio-transponder-payloads-to-launch-2014/

IARU Amateur Satellite Frequency Coordination Pages http://www.amsat.org.uk/iaru