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AMSAT NEWS SERVICE
ANS-176
In this edition:
* Two Awards Available from AMSAT-UK Regarding EO-88's Impending Re-Entry
* URESAT-1 Deployed
* Harbin Institute of Technology Developing New Lunar Amateur Radio
Satellite
* How Many Satellites Can We Safely Fit In Earth Orbit?
* Changes to AMSAT-NA TLE Distribution for June 22, 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
You can sign up for free e-mail delivery of the AMSAT News Service
Bulletins via the ANS List; to join this list see:
https://mailman.amsat.org/postorius/lists/ans.amsat.org/
ANS-176 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 June 25
Two Awards Available from AMSAT-UK Regarding EO-88's Impending Re-Entry
As you may be aware, Solar Cycle 25 has already shown that we cannot yet
predict what the sun will be doing with any great accuracy.
Sunspots, X-class solar flares and CMEs (coronal mass ejections) are
increasing in frequency and intensity on a daily basis.
The peak of Solar Cycle 25 was not expected until late 2024 or early 2025
but it may be coming earlier and have a higher intensity than was predicted
.
One result of this increased activity is that the upper atmosphere and
ionosphere of the earth becomes warmer and expands upwards. This means that
spacecraft in low earth orbit experience more drag or resistance as a
result of the increase in the number atoms they are having to displace as
they travel around the globe. As a consequence, the spacecraft loose more
kinetic energy and start to descend lower in orbital height, which, of
course, makes the problem worse and a fiery end to the spacecraft is
hastened.
The actual effect is also dependant on the drag coefficient of the
particular spacecraft…simply how much mass (the more the better) to
how
much surface area (the less the better). So in CubeSat terms, a 1U CubeSat,
fairly full of stuff with a mass near the maximum of 1.3kg, will probably
be better off than a half empty 3U CubeSat with deployable solar panels and
other drag inducing protuberances.
All TLEs (Two Line Elements) include a parameter called drag, it is usually
a very small number preceeded by four or more zeros! Although this
parameter is calculated by the system, it is not usually precise or even
stable, so cannot be used to accurately predict deorbit dates when looking
forward many weeks/months. It can give us a guide though! Alarm bells
should ring when we only see two leading zeros.
How does this effect our activities? Well for the FUNcube family, there are
presently three active members!
FUNcube-1, AO-73 was launched almost ten years ago in November 2013 into an
elliptical polar orbit of approx 682Ă—595 km. Presently those numbers a
re
around 640Ă—570 km so probably not too much to worry about. The drag nu
mber
from the TLEs is, at the time of writing, 0.000074, a good number.
The same applies to JY1SAT, JO-97. This was launched in December 2018 into
a 573Ă—590 km polar orbit. Presently those numbers are around 557Ă—
573 km and
the current drag is listed as 0.000076.
Unfortunately, however, the same cannot by said for Nayif-1, EO-88. This
spacecraft was launched in February 2017 into a 496Ă—507 km polar orbit
.
Currently the orbit parameters show a height of around 320 km with the drag
at 0.00319. It is now well below the ISS and much lower than at launch.
As mentioned, largely due to the random nature of the our starâ€Ös fl
ux
output on a day to day basis, it is not possible at this stage to
accurately predict the likely deorbit date but it seems that it will
certainly be before the end of this year. As the spacecraft continues to
perform 100% nominally this is a great shame. Presently it is switching
autonomously from high power telemetry when in daylight and with lower
power telemetry and the transponder active when in darkness. The solar
panels, battery and power system also continue to be reporting nominal
numbers, essentially unchanged since the day of launch.
It will therefore be a really sad moment when re-entry occurs but in the
meantime everyone is encouraged to use the spacecraft whilst it remains
available.
To mark the event of EO-88/Nayifâ€Ös demise, AMSAT-UK is offering two
awards.
These will be individual framed certificates.
Firstly, to the station who submits the last telemetry to the FUNcube Data
Warehouse and also to who “guesses” or calculates the re-en
try time and
date most accurately. Submissions for this award must be made to
EO88@amsat-uk.org before midnight (UTC) on July 4th 2023. So time is short
to get your entries in. Good luck!
[ANS thanks AMSAT-UK 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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URESAT-1 Deployed
The URESAT-1 satellite, also known as HADES-B according to its ITU
designation, successfully launched into space as part of the SpaceX
Transporter-8 mission from Vandenberg AFB on Monday, June 12. The satellite
is a joint effort between AMSAT-EA, URE (the Spanish equivalent of ARRL),
private companies, and universities.
The URESAT-1 satellite, contained within the D-Orbit ION Orbital Transfer
Vehicle (OTV), was not deployed directly from the Falcon-9 rocket. Instead,
approximately one hour and twenty minutes after launch, the Falcon-9
released the OTV. URESAT-1 was deployed from the OTV at approximately 12:10
UTC on June 22, 2023. As of this writing, signals have not yet been
received from the satellite.
One of the primary objectives of URESAT-1 is to serve as an FM voice and
FSK data repeater. Equipped with a Slow Scan Television (SSTV) camera, the
satellite will transmit live images as well as stored images at regular
intervals. It also features a chess game, enabling players on Earth to
engage in a game against the satellite. Periodically, the satellite will
transmit updates on the state of the game, including the chess board, the
last movement made, and whether the next move belongs to the players or the
satellite.
The specified frequencies for communication with URESAT-1 are as follows:
for uplink transmissions, 145.975 MHz or 145.925 MHz (auxiliary frequency)
using FM voice without subtone, FSK 50 bps, AFSK, AX.25, APRS 1200/2400
bps. For downlink transmissions, the frequency is set at 436.888 MHz, and
modes include FM voice, CW, FSK 50 bps telemetry, SSTV Robot 36, and a
voice beacon with the callsign AO4URE.
To provide further information regarding URESAT-1's transmissions, the
AMSAT-EA organization has made available a comprehensive document that can
be accessed at the following link:
https://www.amsat-ea.org/app/download/13366685/AMSAT+EA+-+URESAT-1+Transmis
sions+description.pdf
For those interested in decoding the telemetry, a Linux x86/ARM decoder is
available for download at the following link:
https://www.amsat-ea.org/app/download/13395017/URESAT-1_telemetry_decoder_L
inux_X86_ARM_v1.0.zip
A sample file containing the audio of a telemetry file can be found here:
https://www.amsat-ea.org/app/download/13398144/URESAT-1_sample_FSK_telemetr
y-chessboard_packet.wav
If URESAT-1 operates as intended, the project team plans to release a Linux
program that will allow players to send their chess moves to the satellite,
further enhancing the interactive experience.
[ANS thanks Félix Páez, EA4GQS, AMSAT-EA President 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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Harbin Institute of Technology Developing New Lunar Amateur Radio Satellite
Lunar OSCAR II is a lunar amateur radio payload developing by a team
consists of students in Harbin Institute of Technology and international
amateur radio enthusiasts. Its baseline functions include telemetry,
digital image downlink from an infrared camera, and digipeater with JT4G
uplink/downlink. It will also provide chances for uploading and testing new
waveforms and algorithms for radio communications and measurements in very
long distance.
Amateur radio orbit determination experiments, for example Very Long
Baseline Interferometry (VLBI), are also possible with these links.
Harbin Institute of Technology has previously successfully developed the
first lunar amateur radio satellite, Longjiang-2 / DSLWP-B. (LO-94) As a
subsequent mission, Lunar OSCAR II will continue offering various resources
for communications relay and amateur radio research, and promoting the
cooperation of amateur radio communities.
The Lunar OSCAR II payload will be on board a lunar microsatellite with a
volume of about 300x200x100 mm3 and a mass of about 14 kg and will utilize
downlinks on UHF for telemetry and images using 250/500 baud GMSK with
turbo codes and Digipeater using 4.375 baud $FSK with convolutional coding
(JT4G). More information is available at https://by2hit.github.io/.
The satellite is planned for a launch from Wenchang in 2024.
A downlink on 437.750 MHz has been coordinated.
[ANS thanks the IARU and Harbin Institute of Technology for the above
information]
---------------------------------------------------------------------
How Many Satellites Can We Safely Fit In Earth Orbit?
Just 10 years ago, a mere thousand or so operational satellites may have
orbited our planet, but there will be tens or even hundreds of thousands a
decade from now. Experts have been sounding alarm bells for years that
Earth orbit is getting a bit too crowded. So how many satellites can we
actually launch to space before it gets to be too much?
Jonathan McDowell, an astrophysicist and astronomer at the
Harvard-Smithsonian Center for Astrophysics warns the first signs that
things are getting a little too tense are, in fact, already present. "It's
going to be like an interstate highway, at rush hour in a snowstorm with
everyone driving much too fast," he told Space.com when asked what the
situation in orbit will be like if existing plans for satellite
megaconstellations such as SpaceX's Starlink, OneWeb and Amazon Kuiper come
to fruition. "Except that there are multiple interstate highways crossing
each other with no stoplights."
McDowell's British colleague Hugh Lewis is another frequently heard voice
of caution. In a post published on Twitter on Jan. 13, Lewis stated that
"the overall number of conjunctions predicted for 2022 was 134% higher than
the number for 2020 and 58% higher than 2021, exceeding 4 million." That
doesn't mean that on 4 million occasions objects in space came close to a
collision â€ö just that managing traffic in space is getting much mor
e
complicated than it has ever been in the past.
Take SpaceX's Starlink as an example. According to information submitted to
the U.S. Federal Communications Commission (FCC) in December last year,
SpaceX's autonomous collision-avoidance system performed 26,037 orbital
avoidance maneuvers with its Starlink satellites in the two-year period
between Dec. 1, 2020 and Nov. 30, 2022. That means each Starlink satellite
of the nearly 4,000 that have been launched to date performed, on average,
12 avoidance maneuvers during that time.
But the size of SpaceX's current constellation is less than 10% of what the
company plans to deploy. Within the next 10 years, the number of Starlink
satellites in orbit may rise to 42,000. Add to that the up to 4,000
satellites that OneWeb wants to launch, another 3,200 of Amazon's Kuiper
craft and 13,000 satellites of China's envisioned Guowang system, and it
becomes obvious that things are set to get much more heated.
According to the FCC document, SpaceX claims that each of its satellites
has a sufficient amount of fuel on board to perform 350 collision-avoidance
maneuvers over its expected five-year lifetime. But that number could be
reached remarkably soon, according to Lewis' calculations. In short, less
than five years from now, Starlink satellites may be running out of fuel in
a shorter period of time than their designed lifetime because of the sheer
number of avoidance maneuvers they will have to perform.
[ANS thanks Tereza Pultarova, writing for Space.com, 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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Changes to AMSAT-NA TLE Distribution for June 22, 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/
This week there are no additions or deletions to the weekly AMSAT-NA TLE
distribution.
[ANS thanks Joe Fitzgerald, KM1P, AMSAT Orbital Elements Manager, for the
above information]
---------------------------------------------------------------------
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:
No contacts currently scheduled
The crossband repeater continues to be active. If any crewmember is so
inclined, all they have to do is pick up the microphone, raise the volume
up, and talk on the crossband repeater. So give a listen, you just never
know.
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 startń.5 hours
Workday start to Workday end hours
Workday end to Sleepň hours
Sleep to wakeupř.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 donâ€Öt 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 - Configured. Default mode is for cr
oss band
repeater (145.990 MHz up {PL 67} & 437.800 MHz down).
* Powering off for Russian EVA targeting July 26. OFF July 25 about TBD. ON
July 27 about TBD.
* Capable of supporting USOS scheduled voice contacts, packet and voice
repeater ops.
Service Module radios:
IORS (Kenwood D710GA) – STATUS - Configured. Default mode is fo pac
ket
operations (145.825 MHz up & down)
* Powering off for Russian EVA targeting July 26. OFF July 25 about TBD. ON
July 27 about TBD.
* Capable of supporting ROS scheduled voice contacts, packet, SSTV and
voice repeater 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
Adrian (AA5UK) is heading back to the Cayman Islands. He will be operating
as ZF2AE/ZF8 from Little Cayman June 25 to June 29th (EK99wp). He plans to
rent a car June 28th/29th and will try to make it to FK09 grid at the other
end to the island, time permitting. He will operate from Grand Cayman as
ZF2AE June 30th to July 3rd (EK99ki) with focus on cross Atlantic contacts
via AO7, RS44, FO-29 and IO-117. He will be relocating to Seven Mile Beach
to operate from July 4th – July 7th in EK99hi and will try to mix i
t up on
the passes with focus on Western passes.
The gear will be FT-1634 with Alaskan Arrow antenna. For IO-117, he will
be using an IC-7000. Operation will be holiday style. Please follow him on
Twitter @ZF2AE and @AA5UK and watch for the latest announcements. He also
plans to periodically operate HF with focus on RTTY, FT8/FT4 and other
digital modes. QSL information on QRZ.com. LOTW preferred.
[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 Space Symposium and Annual General Meeting
October 20-21, 2023
Dallas, Texas
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. An
email message received after a recent presentation:
"I really enjoyed Clint's presentation last night. The fact that he had
taken the time to research and know something about his audience and
welcomed interaction made it very informative and enjoyable. This was a
refreshing change from many canned YouTube presentations I've tried to
watch, which were poorly done, fuzzy video or muddy audio, or a badly
prepared presenter stumbling his way through, with any valuable info lost
along the way. Thanks for hooking this one up."
[ANS thanks Clint Bradford, K6LCS, and AMSAT for the above information]
---------------------------------------------------------------------
Satellite Shorts From All Over
+ For rocket geeks, an interesting video shows the dynamics of SpaceXâ€
Ös new
stage separation technique, which will be tested on Starship, separating
the booster and upper stage without pusher pistons (like Falcon) or
explosives (like many traditional rockets). The video may be found at
https://www.youtube.com/watch?vţsni8HUEA4 (ANS thanks The Orbital Index
for the above information)
+ Although their identities have been widely circulated previously, the
European Space Agency (ESA), on June 20, formally announced the personnel
who will make up SpaceX Crew-7. They are NASA astronaut Jasmin Moghbeli,
KI5WSL, commander; ESA astronaut Andreas Mogensen, KG5GCZ, from Denmark,
who will serve as pilot; as well as JAXA astronaut Satoshi Furukawa,
KE5DAW, from Japan, and Roscosmos cosmonaut Konstantin Borisov, from
Russia, who will both serve as mission specialists. This crew will launch
from Cape Canaveral in Florida later this summer on a SpaceXâ€Ös Crew
Dragon,
and will remain aboard the International Space Station (ISS) for
approximately six months. (ANS thanks ESA for the above information)
+ Spei Satelles is a 3U CubeSat created by the students and teachers of the
Polytechnic of Turin. During its stay in orbit, Spei Satelles will transmit
a radio signal that can be received by amateurs. The signal contains
messages of hope from the magisterium of Pope Francis. Spei Satelles (the
Latin words for Satellite of Hope) operates in a sun-synchronous low Earth
orbit at about 525 km of altitude from the Earth's surface. At a frequency
of 437.5MHz (Editor's note - this satellite is not coordinated by the IARU
and AMSAT encourages radio amateurs to decline to offer telemetry
collection or other technical support to groups that launch satellites that
are not IARU coordinated and do not offer amateur communications
opportunities) it transmits GMSK at 9600 bit/s AX.25. Spei Satelles also
contains a nanobook, a 2x2x0.2 mm silicon slab on which the images,
speeches, and readings by Pope Francis on March 27, 2020, in the midst of
the pandemic, were imprinted by nanotechnologies. The satellite hitched a
ride aboard Space Xâ€Ös Falcon 9 rocket launching from the Vandenberg
Space
Force Base in California on June 10, after being blessed by Pope Francis on
March 29 at his General Audience in St. Peterâ€Ös Square. (ANS thanks
Religion News Service and Polytechnic of Turin for the above information)
+ Congratulations to Olivier Tymkiw, HB9GWJ, on receiving AMSAT Rover Award
# 077! To earn the AMSAT Rover Award, participants must accumulate a
combined total of 25 points through various achievements in portable
satellite operations outside their home grid square. The AMSAT Rover Award
was established to recognize and honor the accomplishments of satellite
operators who engage in rover operations. Rover operations involve the
activation of grid squares outside one's home grid, utilizing various
satellite transponders and modes to establish communication links. A
breakdown of the points system along with a list of past AMSAT Rover Award
recipients can be found at https://www.amsat.org/amsat-rover-award/. Keep
on roving, Olivier, and continue to inspire others in the AMSAT community!
+ Virgin Galactic will launch its first commercial spaceflight on June
27th.
https://www.space.com/virgin-galactic-first-commercial-spaceflight-june-202
3
(ANS thanks space.com)
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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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