[jamsat-news:3843] [ANS] ANS-316 AMSAT News Service Weekly Bulletins
Paul Stoetzer via ANS
ans ＠ amsat.org
2023年 11月 12日 (日) 09:10:51 JST
AMSAT NEWS SERVICE
ANS-316
In this edition:
* Trends in Propulsion Systems for Small Satellites
* FO-99 Re-enters
* URESAT-1 Designated Spain-OSCAR 120 (SO-120)
* New Satellite Distance Records
* Changes to AMSAT-NA TLE Distribution for November 10, 2023
* ARISS News
* Upcoming Satellite Operations
* Hamfests, Conventions, Maker Faires, and Other Events
* Satellite Shorts From All Over
The AMSAT News Service bulletins are a free, weekly news and information
service of AMSAT, The Radio Amateur Satellite Corporation. ANS publishes
news related to Amateur Radio in Space including reports on the activities
of a worldwide group of Amateur Radio operators who share an active
interest in designing, building, launching and communicating through analog
and digital Amateur Radio satellites.
The news feed on http://www.amsat.org publishes news of Amateur Radio in
Space as soon as our volunteers can post it.
Please send any amateur satellite news or reports to: ans-editor [at]
amsat.org
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ANS-316 AMSAT News Service Weekly Bulletins
To: All RADIO AMATEURS
From: Radio Amateur Satellite Corporation
712 H Street NE, Suite 1653
Washington, DC 20002
DATE 2023 November 12
Trends in Propulsion Systems for Small Satellites
Recently AMSAT News Service had the opportunity to interview Jonathan
Brandenburg, KF5IDY, AMSAT Assistant VP – Engineering about recent trends
in propulsion systems for small satellites.
ANS: “Jonathan, we understand you are looking at propulsion systems that
might be added to future satellites. What is the impetus for this?”
JB: “As we all know, debris is becoming a big issue in space. The amount of
debris in space is growing and any of it that hits a satellite can cause
significant damage. The European Space Agency estimates that there are more
than 35,000 pieces of space debris, 2/3 of which is in LEO. Further, for
the first time the FCC has issued a fine to Dish Network because they were
not able to move its defunct EchoStar-7 satellite fully into the intended
disposal orbit. Dish was supposed to move it 186 miles further from the
earth, but it only reached 76 miles because the satellite ran out of fuel.
This fine is likely a harbinger of things to come.
“The FCC has pending requirements to be able to deorbit on command. Also,
we are beginning to hear rumblings that we may have to be able to maneuver
satellites to avoid a “conjunction event,” that is a collision. This is
just in the conversation stage.”
“In addition, we often wish to reach higher orbits with AMSAT’s satellites.
With the ability to thrust we can launch into a lower and more accessible
orbit then raise our orbit with onboard thrusters.
ANS: “That is very crucial capability for AMSAT to add. What is required to
do this and how difficult will it be to achieve?”
JB: “We need three things: a GNSS – a Global Navigational Space System, an
ADCS – an Attitude Determination, and Control System, and a thruster.
“A GNSS is needed to determine the exact position of the satellite. We have
a current ASCENT project in progress for this.
“We have to be able to accurately determine the position and orientation of
the satellite so that we know the thrusters are oriented in the correct
direction when they are fired. We are currently planning to fly an ADCS on
the GOLF-TEE satellite which estimated to be launched in Q2 2025. The plan
is to fly an ADCS purchased from CubeSat.
“We have a new ASCENT project for small satellite thrusters. This is our
topic of discussion here. There are many different types of thruster
systems. Examples are:
- Solid motor thrusters which are very powerful,
- Hall effect thrusters which are popular, large and power hungry but very
reliable,
- Electrospray thrusters are relatively inexpensive and simple. The
propellant can be solid or a liquid which melts down quickly and then is
accelerated out of the nozzle with an electric field. It is an affordable
technology, and a moderately simple technology.
- And pulsed plasma/vacuum arc thrusters which have the advantage of being
a very, very simple and affordable technology. It uses an electric arc to
ablate the material which becomes the fuel. The fuel material can be a
light metal or a high technology plastic.
“We’ve recently acquired a demonstration kit for a pulsed plasma type
thruster. We are in the early stages of engaging our volunteers to perform
an in-depth analysis of this thruster as part of our investigation to
determine which thruster is the most appropriate for AMSAT.
ANS: ”Interesting. How can we learn more?”
JB: “I gave a 20-minute presentation on this at the recent AMSAT Annual
Space Symposium, which you can see on YouTube. The presentation includes a
short demonstration of a pulse plasma type thruster made by Hypernova
Space. The demonstration includes firing the thruster, the control
software, and some of the output data.”
ANS: Thank you for your time, Jonathan!
Link to Jonathan Brandenburg’s presentation is:
https://www.youtube.com/watch?v=pcO4-h7bbxs&t=465s
[ANS thanks Jonathan Brandenburg, KF5IDY, AMSAT Assistant VP – Engineering
and Mark
Blackwood, KI5AXK for the above information.]
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The 2023 AMSAT President's Club coins are here now!
To commemorate the 40th anniversary of its launch
on June 16, 1983, this year's coin features
an image of AMSAT-OSCAR 10.
Join the AMSAT President's Club today and help
Keep Amateur Radio in Space!
https://www.amsat.org/join-the-amsat-presidents-club/
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FO-99 Re-enters
FO-99 re-entered on November 9, 2023 after nearly five years in orbit.
Launched on January 18, 2019 on an Epsilon launch vehicle, the 1U CubeSat,
named NEXUS for Next Generation X Unique Satellite, was designed and built
by Nihon University in collaboration with JAMSAT. The satellite
demonstrated a high speed QPSK transmitter and also sent SSTV transmissions
and carried a VHF/UHF linear transponder.
[ANS thanks Nihon University, JAMSAT, and AMSAT Orbital Elements Manager
Joe Fitzgerald, KM1P, for the above information]
-------------------------------------------------------------------
URESAT-1 Designated Spain-OSCAR 120 (SO-120)
On June 12, 2023, the URESAT-1 satellite was launched on a Falcon 9 launch
vehicle from Vandenberg Space Force Base in California. Developed by
AMSAT-EA, the satellite carries an SSTV camera, and FM and digital repeater
payloads to provide services to amateur radio enthusiasts around the world.
Signals have been received with the use of several large dish ground
stations, and efforts continue to deploy the spacecraft antennas and
improve the downlink strength.
At the request of AMSAT-EA, AMSAT hereby designates URESAT-1 as Spain-OSCAR
120 (SO-120). We congratulate AMSAT-EA, thank them for their contribution
to the amateur satellite community, and wish them continued success on this
and future projects.
[ANS thanks Drew Glasbrenner, AMSAT Vice President - Operations and OSCAR
Number Administrator for the above information]
-------------------------------------------------------------------
New Satellite Distance Records
Jérôme LeCuyer, F4DXV, set yet another distance record on October 15th when
he worked Scott Richardson, N1AIA, on SO-50. Jérôme was located in JN14ch
while Scott was in FN43rh, a distance of 5,645.3 km. This eclipses the
previous record of 5,548 km set by KE9AJ and MI0ILE in May.
Additionally, Puneit Singh, VU2TUM, claimed the initial distance record on
Tevel-2 with a 3,815 km QSO with BA1PK in ON80eb. VU2TUM's QTH was ML88ij.
[ANS thanks AMSAT Executive Vice President Paul Stoetzer, N8HM, for the
above information]
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Need new satellite antennas? Purchase an M2 LEO-Pack
from the AMSAT Store. When you purchase through
AMSAT, a portion of the proceeds goes towards
Keeping Amateur Radio in Space.
https://amsat.org/product-category/hardware/
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Changes to AMSAT-NA TLE Distribution for November 10, 2023
Two Line Elements or TLEs, often referred to as Keplerian elements or keps
in the amateur community, are the inputs to the SGP4 standard mathematical
model of spacecraft orbits used by most amateur tracking programs. Weekly
updates are completely adequate for most amateur satellites. TLE bulletin
files are updated Thursday evenings around 2300 UTC, or more frequently if
new high interest satellites are launched. More information may be found at
https://www.amsat.org/keplerian-elements-resources/
The following satellites have been removed from this week's AMSAT-NA TLE
distribution:
TY-1 NORAD Cat ID 41844 Decayed from orbit on or about 07 November 2023
Astrocast 0.2 NORAD Cat ID 44083 Does operate in the Amateur Satellite
Service
FO-99 NORAD Cat ID 43937 Decayed from orbit on 09 November 2023
YukonSat NORAD Cat ID 56316 Decayed from orbit on or about 09 November 2023
[ANS thanks Joe Fitzgerald, KM1P, AMSAT Orbital Elements Manager, for the
above information]
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Want to fly the colors on your own grid expedition?
Get your AMSAT car flag and other neat stuff
from our Zazzle store!
25% of the purchase price of each product goes
towards Keeping Amateur Radio in Space
https://www.zazzle.com/amsat_gear
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ARISS News
Amateurs and others around the world may listen in on contacts between
amateurs operating in schools and allowing students to interact with
astronauts and cosmonauts aboard the International Space Station. The
downlink frequency on which to listen is 145.800 MHz worldwide.
Quick list of scheduled contacts and events:
New Heights School & Learning Services, Calgary, AB, Canada, telebridge via
IK1SLD (***)
The ISS callsign is presently scheduled to be OR4ISS
The downlink frequency is presently scheduled to be 145.800 MHz
The scheduled crewmember is Andreas Mogensen KG5GCZ
The ARISS mentor is VE6JBJ
Contact is go for: Fri 2023-11-17 17:06:45 UTC 24 deg
National Research Nizhny Novgorod State University, Nizhny, Novgorod,
Russia, direct via TBD (***)
The ISS callsign is presently scheduled to be RSØISS
The downlink frequency is presently scheduled to be 145.800 MHz
The scheduled crewmember is Konstantin Borisov
The ARISS mentor is RV3DR
Contact is go for Wed 2023-11-22 16:40 UTC
Comments on making general contacts
I have been seeing a lot of traffic on Facebook and I suspect on other
social media sites with people asking why they are not hearing the crew
make general contacts. First off the crew is very busy on the ISS and they
simply may not have the time to just pick up the microphone and talk.
Also, one needs to be aware of their normal daily schedule. I have listed
below the constraints that we at ARISS have to follow in order to schedule
the school contacts. Hopefully this will help you better schedule your
opportunities.
Typical daily schedule
Wakeup to Workday start= 1.5 hours
Workday start to Workday end=12 hours
Workday end to Sleep= 2 hours
Sleep to wakeup= 8.5 hours
The crew's usual waking period is 0730 - 1930 UTC. The most common times to
find a crew member making casual periods are about one hour after waking
and before sleeping, when they have personal time. They're usually free
most of the weekend, as well.
SSTV events are not that often. So please check out https://www.ariss.org/
for the latest information or watch for the ARISS announcements.
And don’t forget that the packet system is active.
As always, if there is an EVA, a docking, or an undocking; the ARISS radios
are turned off as part of the safety protocol.
ARISS Radio Status
Columbus Module radios:
IORS (Kenwood D710GA) – STATUS - Misconfigured. Default mode is for cross
band repeater (145.990 MHz up {PL 67} & 437.800 MHz down).
* Powering off for Progress undock on November 29. OFF TBD . ON TBD.
* Powering off for Progress docking on December 01. OFF TBD . ON TBD.
* Capable of supporting USOS scheduled voice contacts, packet and voice
repeater ops.
Service Module radios:
IORS (Kenwood D710GA) – STATUS - Temporarily stowed. Default mode is for
packet operations (145.825 MHz up & down)
* Capable of supporting ROS scheduled voice contacts, packet, SSTV and
voice repeater ops.
SSTV (Kenwood D710) – STATUS - OFF. Default mode is for scheduled SSTV
operations (145.800 MHz down)
* Next planned operation date(s) TBD.
* Specifically configured for SSTV ops.
The latest information on the operation mode can be found at
https://www.ariss.org/current-status-of-iss-stations.html
The latest list of frequencies in use can be found at
https://www.ariss.org/contact-the-iss.html
[ANS thanks Charlie Sufana, AJ9N, one of the ARISS operation team mentors
for the above information]
--------------------------------------------------------------------
Upcoming Satellite Operations
No scheduled operations are listed at this time.
[ANS thanks Ian Parsons, K5ZM, AMSAT rover page manager, for the above
information]
---------------------------------------------------------------------
Hamfests, Conventions, Maker Faires, and Other Events
AMSAT Ambassadors provide presentations, demonstrate communicating through
amateur satellites, and host information tables at club meetings, hamfests,
conventions, maker faires, and other events.
AMSAT Ambassador Clint Bradford, K6LCS, says,
"Think a 75-minute presentation on "working the easy satellites" would be
appropriate for your club or event? Let me know by emailing me at
k6lcsclint (at) gmail (dot) com or calling me at 909-999-SATS (7287)!"
Clint has NEVER given the exact same show twice: EACH of the 150+
presentations so far has been customized/tailored to their audiences.
[ANS thanks Clint Bradford, K6LCS, and AMSAT for the above information]
---------------------------------------------------------------------
Satellite Shorts From All Over
+ NASA has launched a new no cost, ad-free streaming service featuring live
coverage and original video series. Details on the service, called NASA+,
can be found at https://plus.nasa.gov/ (ANS thanks NASA for the above
information)
+ Aviation Week has published an article entitled "CubeSats: How How An
Accidental Standard Launched A New Space Age" which features quotes from
AMSAT's 2023 Symposium keynote speaker Bob Twiggs.
https://aviationweek.com/aerospace/commercial-space/cubesats-how-accidental-standard-launched-new-space-age
"
+ DO-64 (Delfi-C3) is rapidly approaching re-entry. Over 350 frames of
telemetry have been submitted by amateur radio operators over the past few
days. (ANS thanks Delfi Space for the above information)
+ Ireland's first satellite - EIRSAT-1 - is scheduled to launch at the end
of the month on a SpaceX Falcon 9 from Vandenberg Space Force Base. The
satellite's downlink is 437.100 MHz (ANS thanks the EIRSAT-1 team for the
above information)
----------------------------------------------------------------------
Join AMSAT today at https://launch.amsat.org/
In addition to regular membership, AMSAT offers membership to:
* Societies (a recognized group, clubs or organization).
* Primary and secondary school students are eligible for membership at
one-half the standard yearly rate.
* Post-secondary school students enrolled in at least half time status
shall be eligible for the student rate for a maximum of 6 post-secondary
years in this status.
* Memberships are available for annual and lifetime terms.
Contact info [at] amsat.org for additional membership information.
73 and remember to help Keep Amateur Radio in Space!
This week's ANS Editor,
Paul Stoetzer, N8HM
n8hm [at] amsat.org
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