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Science / Space Race

[December 8, 1965] Space is Getting Crowded (A-1/Asterix, FR-1, Explorer-31, Alouette-2, Luna-8, Gemini-7

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by Kaye Dee

A few weeks ago, I wrote that November had been a busy month for space missions, but just in the past three weeks the heavens have become even more crowded, with six more launches taking place

France Joins the Space Club-Twice!

Congratulations to France on orbiting its first two satellites within ten days of each other, joining that exclusive club of nations that have either launched their own satellite, or put a satellite into orbit with the help of the United States. In France’s case it has done both!

In addition to its participation in the European Launcher Development Organisation (ELDO), France has its own national space programme, managed by its space agency, the Centre National d'Etudes Spatiales (National Centre for Space Studies, or CNES for short). Established just on four years ago (19 December 1961), CNES has moved rapidly to make France a leading player in the Space Race: it has been working with the French Army on the development of a satellite carrier rocket, named Diamant, and with the United States on a series of satellites dubbed “FR” (for France, of course).

France’s first satellite, A-1, was launched on 26 November on the first flight of the Diamant (Diamond) launcher from the French ballistic missile test site at Hammaguir, in Algeria. With this launch, France has become the sixth country to have a satellite in orbit—and only the third nation after the USSR and United States to launch a satellite on its own launch vehicle (Canada, the UK and Italy all launched their satellites on American rockets). 


France's Diamant rocket lifts off successfully on its maiden flight, carrying the A-1 satellite

The 60ft tall Diamant is derived from France’s “Precious Stones” nuclear ballistic missile development programme. It is a three-stage rocket, with the first stage being liquid-fuelled and the two upper stages derived from solid-fuel missiles. The satellite is officially named A-1 (Armée-1/Army-1) as it is the first satellite launched by the French Army, but the French media quickly nicknamed it Asterix, after a popular character in French comic strips. This character isn’t well-known in the English-speaking world, but apparently “Asterix the Gaul” is hugely popular in France. According to some of the ELDO people at Woomera, the A-1 satellite was originally intended to be the second satellite in the FR series. It was hurriedly selected to fly on the first Diamant test launch, because FR-1 was in the final stages of being readied for launch in the United States (more on that below). 


A-1 being readied for launch, mounted on top of the Diamant's third stage

A-1/Asterix is shaped a bit like a spinning-top and, rather unusually, its body is made of fibreglass, which is decorated with black stripes for passive thermal control, to stop the satellite’s interior overheating. A-1 is 22 inches in diameter and 22 inches high, with four antennae around its midriff. It weighs 92 ½lbs and carries instruments for taking measurements of the ionosphere. Battery powered, A-1 was expected to transmit for about 10 days, but although the launch was successful, the signals from the satellite quickly faded, possibly due to damage to its antennae caused by part of the protective nosecone hitting the satellite as it fell away. However, even though it is no longer transmitting, A-1 will remain in orbit for several centuries!


On 30 November, the French Post Office celebrated the successful launch of France's first satellite with the release of a stamp triptych

France’s second satellite, FR-1, was launched on 6 December local time using a Scout X-4 vehicle from the Vandenberg Air Force Base in California. Originally intended to be the first French satellite, FR-1 is the first of a series of French scientific satellites that have been developed by CNES in conjunction with the Centre National d'Etudes des Telecommunications (National Centre for Telecommunications Studies, or CNET). This project is partially funded by NASA’s Office of Space Science Applications as part of a co-operative programme that commenced in 1959, when the United States offered to launch satellites for any nation that wished to take part. Canada, Britain and Italy have all launched their first satellites under this programme (which is why they were launched on US rockets). Australia has been invited to participate but, so far, our government has rejected proposals from the scientific community on the basis that it cannot afford to fund the development of a satellite.


FR-1, the second French satellite mounted on its Scout launch vehicle, before the rocket is moved to the pad

The FR-1 satellite (France-1, also known as FR-1A) carries experiments to study VLF propagation in the magnetosphere and irregularities in the topside ionosphere. It also has an electron density probe to measure electron concentration in the vicinity of the satellite. Weighing 135lb, FR-1 looks like two truncated octagonal pyramids joined at their bases by an octagonal prism measuring 27 inches across from corner to corner. The body is covered with solar cells and bristles with antennae and probe booms. FR-1 is operating smoothly so far, but it carries no onboard tape recorder, so the satellite’s data has to be transmitted in real time when it passes over designated ground stations.

So why the rush to get the Asterix out before FR-1? The launch of Asterix seems to have been a combination of expediency and French nationalism. CNES and the Army were ready to do the first test launch of the Diamant rocket, and these sort of first tests are usually just done with a ballast payload, so that if the rocket fails nothing important is lost. In this case, CNES seems to have thought that they might as well take the risk of putting a satellite on the rocket, because if it succeeded it would give France the honour of being the third nation to launch its own satellite. As FR-1 was already at Vandenberg being prepped for launch, it was easier to pull out FR-2, which was a smaller satellite and already pretty well completed development, to become the payload for the Diamant flight. If the Diamant launch was then delayed for some reason, or failed, France would still become one of the earliest nations with a satellite in orbit with the launch of FR-1. So, as we say in Australia, they "had a bob both ways" on gaining some space kudos!

ISIS-X: International Cooperation Exploring the Ionosphere

NASA must now have a virtual production line, churning out Explorer satellites like sausages for launch about two weeks apart, if the past month has been anything to go by: there was Explorer-29 on 6 November, Explorer-30 on 19 November and now Explorer-31 on 29 November. This latest Explorer is also known as Direct Measurement Explorer-A (DME-A) and it represents the American half of a joint ionospheric research program with Canada, which is collectively known as International Satellites for Ionospheric Studies-X (ISIS-X).


Explorer-31 ready for shipment to Vandenberg Air Force Base

Explorer-31 weighs about 218lb and carries seven experiments that can be operated simultaneously or sequentially, taking direct measurements immediately in front of, and behind, the satellite's path. Solar cells that cover about 15 percent of the satellite’s surface provide its power. Like FR-1, this small spacecraft does not carry an onboard tape recorder, so its data has to be transmitted ‘live’ when it is turned on while passing over one of NASA’s Space Tracking and Data Acquisition Network (STADAN) ground stations.

Explorer-31 was launched from Vandenberg Air Force Base by a Thor Agena-B rocket, riding piggy-back with its Canadian ISIS-X counterpart, Alouette-2. This satellite has been developed by the Canadian Defence Research Board-Defence Research Telecommunications Establishment, as part of the same programme under which Canada’s first satellite, Alouette-1 was launched back in September 1962. This second Alouette has been developed from the original Alouette-1 back-up satellite, although it has more experiments and is a more sophisticated satellite than its predecessor. The name “Alouette” (skylark) comes from that popular French-Canadian folk song that I think everyone knows, even if they have never learned French.


Photos of Alouette-2 and Explorer-31 are hard to find, but they are reasonably well depicted on this souvenir cover marking their joint launch. It's lucky my Uncle Ernie goes to so much effort to build his space philately collection

At 323lb, Alouette is much larger than Explorer-31, but the two satellites have been placed in near identical orbits so that their data can complement each other. Alouette-2 is designed to explore the ionosphere using the technique of ‘topside sounding’, which determines ion concentration within the ionosphere by taking measurements from above the ionosphere. Alouette-1 was also a topside sounder. The satellite is carrying five instruments, three of which utilise two very long dipole antennae (one is 240ft, the other 75ft long). Alouette 2 also has no onboard data recorder and downloads its data when passing over stations in NASA’s STADAN network.

Luna-8-Fourth Time Unlucky!

Despite its early lunar exploration triumphs with Luna-1, 2 and 3 (which we in the West nicknamed “Lunik”, to match with Sputnik), the USSR has not had much success since with its Moon program. USSR’s Luna-8 probe, launched on 3 December, was the Soviet Union’s fourth attempt to soft-land a spacecraft on the lunar surface this year. Being able to land safely on the Moon is a technique that both the United States and the Soviet Union need to master in order to successfully accomplish a manned lunar landing later this decade. Two of this year’s attempts, Luna-5 and Luna-7, crashed while attempting to land. Luna 6 went off course and missed the Moon, flying by at 99,000 miles.

Luna-8, intended to land in the Oceanus Procellarum (Ocean of Storms), also failed in its mission yesterday. According to TASS, the “probe’s soft-landing system worked normally through all stages except the final touch-down”. It looks like Luna-8 has followed Luna-7 in crashing on the Moon. Let’s see if Russia has better luck with Luna 9!

Gemini 7-Settling in for a Long Haul

Just a day after Luna-8, the latest mission in NASA’s Gemini program, Gemini-7 was launched on what is planned to be a two-week endurance mission, that will include a rendezvous with the Gemini-6 spacecraft. I’m not going to write about this mission, as one of my colleagues here will do that later this month, but I couldn’t sign off on this article without mentioning the latest addition to the impressive list of spacecraft launched in the past few weeks. The Space Race is really speeding up!




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Science / Space Race

[September 6, 1964] New Stars in the Sky (Explorer 20, Nimbus, and OGO-1)

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by Kaye Dee

I love watching satellites — and it seems like every week now there are new stars in the sky as more satellites are launched to help us learn more about outer space and the Earth itself. Just in the past two weeks, we’ve seen three new satellites dedicated to discovering more about the Earth’s atmosphere and the way it works.

Explorer-XX: Topside Down

The first of the recent launches was Explorer-XX, finally orbited on 25 August from Vandenberg Air Force Base in California after problems with its Scout X-4 booster that took many months to resolve. Explorer-XX has a string of aliases: it’s also known as Ionosphere Explorer IE-A, Ionosphere 2, Science S-48, Topside-sounder, TOPSI and Beacon Explorer BE-A! Underneath all those monikers, it’s the latest in the series of scientific research satellites that began with America’s first satellite, Explorer-I, back in 1958.


Explorer-XX under construction

Explorer-XX’s main purpose is to act as a topside sounder, which means that it takes measurements of the ion concentration within the ionosphere from orbit above it. This data can then be compared with measurements taken from the ground. Since the ionosphere is what makes global radio communications possible, understanding its composition and characteristics is important to scientific and defence research, as well as international radio telecommunications operators.

Unlike some satellites, Explorer-XX doesn’t have an onboard tape recorder, so it can only transmit data when it’s in range of a ground station. One of those ground stations happens to be just outside the Woomera Rocket Range, at NASA’s Deep Space Instrumentation Facility at Island Lagoon. Island Lagoon is actually a dry salt-lake (and not a bad picnic spot for a nice Sunday outing from Woomera Village), and its shores proved to be an ideal location for NASA’s first deep space tracking station outside America. Last year, the Minitrack radio-interferometry tracking system that was originally installed on Woomera’s Range G to support satellite tracking during the International Geophysical Year, was moved to the Island Lagoon site. Minitrack is part of NASA’s Satellite Tracking and Data Acquisition Network and it can receive the Explorer-XX data. Some of the sounding rocket work out at Woomera also involves taking ionospheric soundings for defence and civilian scientific research, so I’m sure my colleagues at WRE will soon be incorporating the data from Explorer-XX into their research as well.


NASA's Minitrack station at Island Lagoon, near Woomera – one of the data receiving stations for Explorer-XX

Following in Canada's Footsteps

Explorer-XX is only the second topside sounder ever launched. The first was Alouette-1, Canada’s first satellite, which went into orbit almost exactly two years ago and is still in operation. Alouette-1, by the way, was part of a program in which the United States generously offered to launch satellites for other countries. Great Britain and Canada have already had their first satellites launched this way, and Italy will soon have a satellite launched by NASA as well. Australia had an invitation to take part in this project, too, but while I was working for the WRE, I heard that our government had rejected the offer on the basis that the country couldn’t afford it — which is pretty short-sighted thinking, if you ask me!

Canadian scientists celebrating the launch of their first satellite-Alouette-1. Wish there was a picture of Australian scientists doing the same.

Nimbus-1: Second-Generation Weather Satellite

Even if the Australian Government lacked the vision to take up America’s offer of a satellite launch, it is interested in taking advantage of the practical ways in which satellite can benefit the country. Last month, I mentioned Australia’s intention to be part of the INTELSAT communications satellite consortium, and our Bureau of Meteorology is fast becoming a major user of weather satellites. Its ground station was one of 47 outside the United States to receive live weather images broadcast directly from space from the TIROS-8 weather satellite launched last December. Some test transmissions were received from TIROS-8 on Christmas Day, just a few days after its launch, and images have been regularly received since January 7 this year.

Now, the first of a new weather type of weather satellite is in orbit, from which Australia is also receiving data. Nimbus-1 (aka Nimbus-A) was launched from Vandenberg just a few days after Explorer-XX, on August 28. It’s now in polar orbit, more eccentric than desired because of a short second-stage burn, but all its instruments are functioning and ground stations are receiving regular data.


Some people think Nimbus-1 looks like a butterfly, though it reminds me of an ocean buoy with solar panels attached either side!

Like TIROS-8, Nimbus-1 can transmit live cloud images from orbit using the Automatic Picture Transmission instrument. This television system is designed to photograph an area of 800 miles square, which is the largest field of view to date. The pictures are transmitted using a slow-scan system of four lines per second, similar to the way radio photographs are sent. Each ground station is designed to receive three pictures per orbit. Nimbus can also store data on board and retransmit it later if it is not in range of a ground station. But what makes Nimbus-1 different from TIROS-8 is that its High-Resolution Infra-red Radiometer enables it to take images at night and measure the night-time radiative temperature of cloud tops and the Earth’s surface, so that data is being acquired all day, every day.


Here's a diagram of Nimbus-1 showing its main components and instruments.

On its first day in orbit, Nimbus took a picture of Hurricane Cleo as it travelled north along the US east coast after devastating parts of the Caribbean and Florida. This really demonstrates that with the data and images from the TIROS and Nimbus satellites, the Bureau of Meteorology will now be able to reliably track the development of conditions over the Pacific, Southern and Indian Oceans that determine the weather across different parts of Australia. The poet Dorothea Mackellar didn’t call Australia the “land of droughts and flooding rains” for nothing, but weather satellites will undoubtedly improve the forecasters’ abilities to see when these weather conditions are coming!


Hurricane Cleo imaged by Nimbus-1. Its strike on Florida delayed the launch of the Gemini-2 unmanned test flight.

Orbiting Geophysical Observatory-1: A New Design Paradigm

Just two days ago, 5 September (Australia time), NASA’s third recent satellite was launched. This time it was the Orbiting Geophysical Observatory, or OGO-1, the first of a series of satellites that is intended to study the atmosphere, magnetosphere and the space environment between the Earth and the Moon, making sure that it will be safe for the Apollo astronauts to traverse this region of space.


This philatelic cover marking the launch of OGO-1 highlights its role in manned spaceflight safety.

OGO-1 is the largest and most complex scientific satellite that NASA has launched to date. With the OGO series, NASA is taking a new approach to satellite design. Until now, each satellite has been designed to accommodate the instruments and experiments that it would carry. However, with OGO, the satellite design is fixed and the experiments are tailored to fit the satellite. Each satellite will carry about 20 experiments.


Diagram of the universal OGO bus that will be used for all the satellites in the series.

OGO-1 has been placed into a highly elliptical orbit with an apogee of almost 93,000 miles, and the plan is for future OGO missions to alternate between this type of orbit and low polar obits. At 31° inclination (its angle with respect to the equator), the OGO series needs additional tracking stations to supplement NASA’s STADAN network. One of these support stations will be established next year in Darwin, in the Northern Territory, as an outstation of the STADAN station at Carnarvon. This facility is part of the NASA Carnarvon tracking station that I mentioned in my last article, which is a prime tracking station for the upcoming Gemini missions.

Unfortunately, one of OGO-1's long booms and one of its short booms did not properly deploy. As a result the satellite used up most of its stablisation-thruster fuel attempting to lock the satellite into its Earth-stabilised orbit. For the moment, scientists have decided not to turn on any of OGO-1's instruments while they work out ways to operate it as a spin-stablised satellite. Let's hope they succeed as this satellite and its successors promise a wealth of new data on the near-space environment.


OGO-1's deployment from its folded launch configuration to its operational configuration is rather complex. I guess it's not surprising that this new satellite has had some problems in properly unfolding!

It’s exciting to see so many new space missions occurring and knowing that, through the tracking stations around the country (managed by the WRE on NASA’s behalf and operated by local engineers and technicians) Australia is playing its part in the exploration and peaceful use of outer space. I can scarcely wait to see what goes up next month!




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Science / Space Race

[March 24, 1963] Bumper Crop (A bounty of exciting space results)

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by Gideon Marcus

February and March have been virtually barren of space shots, and if Gordo Cooper's Mercury flight gets postponed into May, April will be more of the same.  It's a terrible week to be a reporter on the space beat, right?

Wrong!

I've said it before and I'll say it again.  Rocket launches may make for good television, what with the fire, the smoke, and the stately ascent of an overgrown pencil into orbit…but the real excitement lies in the scientific results.  And this month has seen a tremendous harvest, expanding our knowledge of the heavens to new (pardon the pun) heights.  Enjoy this suite of stories, and tell me if I'm not right…

How hot is it?

Mariner 2 went silent more than two months ago, but scientists are still poring over the literal reams of data returned since its rendezvous with Venus.  The first interplanetary mission was a tremendous success, revealing a great deal about the Planet of Love, whose secrets were heretofore protected by distance and a shroud of clouds. 

Here's the biggie: Preliminary reports suggested that the surface temperature of "Earth's Twin" is more than 400 degrees Fahrenheit.  It turns out that was a conservative estimate.  In fact, the rocky, dry landscape of Venus swelters at 800 degrees — possibly even hotter than the day side of sun-baked first planet, Mercury.  It's because the planet's dense carbon dioxide atmosphere acts like a heat blanket.  There's no respite on the night side of the hot world either; the thick air spreads the temperatures out evenly.

Thus, virtually every story written about Venus has been rendered obsolete.  Will Mariner 3 destroy our conception of Mars, too?

Just checking the lights

On February 25, the Department of Defense turned little Solrad 1 back on after 22 months of being off-line.  The probe had been launched in conjunction with a navigation satellite, Transit, back in June 1960.  For weeks, it had provided our first measurements of the sun's X-ray output (energy in that wavelength being blocked by the Earth's atmosphere and, thus, undetectable from the ground).  DoD has given no explanation for why the probe has been reactivated, or why it was turned off in the first place.  Maybe there's a classified payload involved?

Radio News from the Great White Spacecraft

Last September, the Canadians launched their first satellite — the "top-sounder," Alouette, whose mission was to measure the radio-reflective regions of our atmosphere from above.  The results are in, and to any HAM or communications buff, its huge news.

It turns out that the boundaries of the ionosphere are rougher at higher latitudes than at lower latitudes.  Moreover, Alouette has determined that the Van Allen Belts, great girdles of radiation around our planet, dip closer to the Earth at higher latitudes.  This heats up the ionosphere and causes the roughness-causing instability. — the more active the electrons, the poorer the radio reflection.  Now we finally know why radio communication is less reliable way up north.  The next step will be learning how to compensate for this phenomenon so that communication, both civil and military, can be made more reliable.

Sun Stroke Warning

After a year in orbit, NASA's Orbiting Solar Observatory is still going strong, with 11 of 13 experiments still functioning.  The satellite has probably returned more scientifically useful data than all of the ground-based solar observatories to date (certainly in the UV and X Ray spectra, which is blocked by the atmosphere).

Moreover, OSO 1 has returned a startling result.  It turns out that solar flares, giant bursts of energy that affect the Earth's magnetic field, causing radio storms and aurorae, are preceded by little microflares.  The sequence and pattern of these precursors may be predictable, in which case, OSO will give excellent advance warning of these distruptive events.

Tax money at work, indeed!

Galaxy, Galaxy, Burning Bright

In the late 1950s, astronomers began discovering some of the brightest objects in the universe.  It wasn't their visible twinkle that impressed so much as their tremendous radio outbursts.  What could these mysterious "quasi-stellar sources" be?

Now we have a pretty good guess, thanks to a recent scientific paper.  Cal Tech observers using the Mt. Wilson and Mt. Palomar observatories turned their gaze to object 3C 273, a thirtheenth magnitude object in the constellation of Virgo.  It turns out that 3C 273's spectrum exhibits a tremendous "red shift," that is to say, all of the light coming from it has wavelengths stretched beyond what one would expect.  This is similar to the decrease in pitch of a railroad whistle as the engine zooms away from a listener.

The only way an object could have such a redshift is if it were of galactic proportions and receding from us at nearly 50,000 km/sec.  This would place it almost 200,000,000 light years away, making it one of the most distant (and therefore, oldest) objects ever identified.

At some point, astronomer Hubble's contention that the universe is expanding is likely to be confirmed.  These quasi-stellar objects ("quasars"?) therefore represent signposts from a very young, very tiny universe.  What exciting times we live in!

Five years of Beep, Beep

St. Patricks Day, 1958 — Vanguard 1 was the fourth satellite in orbit, but it was the first civilian satellite, and it is the oldest one to remain up there.  In fact, it is the only one of the 24 probes launched in the 1950s that still works.

What has a grapefruit-sized metal ball equipped with a radio beacon done for us?  Well, plenty, actually.  Because it has been tracked in orbit so long, not only have we learned quite a bit about the shape of the Earth (the variations in Vanguard's orbit are due to varying gravities on the Earth, the measurement of which is called "geodetics"), but the satellite's slow decay also tells us a lot about the density of the atmosphere several hundred miles up.

So, while Sputnik and Explorer might have had the first laughs, Vanguard looks likely to have the last for a good long time.

Telstar's little brother does us proud

RCA's Relay 1, launched in December, is America's second commercial communications satellite.  It ran into trouble immediately upon launch, its batteries producing too little current to operate its transmitter.  Turns out it was a faulty regulator on one of the transponders; the bright engineers switched to the back-up (this is why you carry a spare!), and Relay was broadcasting programs across the Atlantic by January.  660 orbits into its mission and 500 beamed programs later, NASA announces that Relay has completed all tests. 

Nevertheless, why abandon a perfectly good orbital TV station?  Relay will continue to be used to transmit shows transcontinentally, especially now that Telstar has finally gone silent (February 21).  There is even talk that Relay could broadcast the Tokyo Olympics in 1964, if it lasts that long!

In a sea of Blue, a drop of Red

On March 12, 3-12 at the Spring Recognition Dinner of Miracle Mile Association, in Los Angeles, Cal Tech President, Lee DuBridge, noted that the United States has put 118 probes into space, while the Russians have only lofted 34 (that we know of).  He also pointed out that virtually no scientific papers have resulted from the Soviets' "science satellites." 

As if in reply, on March 21 the Soviets finally, after 89 days without a space shot, launched Kosmos 13.  (To be fair, it's been kind of quiet on the American side, too).  The probe was described as designed to "continue outer space research."  No description of payload nor weight specifications were given.  Its orbit is one that allows it to cover much of the world.  While it may be that some of the Kosmos series are truly scientific probes, you can bet that, like America's Discoverer program, the Kosmos label is a blind to cover the Russians' use of spy satellites.  Oh well.  Turnabout is fair play, right?

[Next up, don't miss Mark Yon's spotlight of this month's New Worlds!  And if I saw you at Wondercon, do drop me a line…]

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