Mission to Planet Earth

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Fifteen years ago today — August 7, 1997 — the Space Shuttle Discovery launched from the Kennedy Space Center on a mission to study the Earth’s atomosphere from space.


(Discovery‘s payload bay, outfitted with experimental packages for STS-85. NASA image.)

Astronauts Curtis L. Brown, Jr., Kent V. Rominger, N. Jan Davis, Robert L. Curbeam, Jr., Stephen K. Robinson, and Canadian Space Agency astronaut Bjarni Y.Tryggvason made up the crew of mission STS-85. Their mission was the second to carry the Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere, Shuttle Pallet Satellite (with the unwieldy acronym CRISTA-SPAS) as part of the “Mission to Planet Earth.” They deployed the pallet shortly after reaching orbit, and retrieved it on August 16th.

STS-85 also carried the Japanese Manipulator Flight Development (MFD) system; two “hitchhiker” payloads, Technology Applications and Science-01 (TAS-1) and the International Extreme Ultraviolet Hitchhiker-02 (IEH-02), and a variety of smaller experiment packages in the main cabin. The crew “also worked with the Orbiter Space Vision System (OSVS), which [was] used during ISS assembly.” They returned to Earth on August 19th.

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Curiosity Has Landed

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A few hours ago the Mars Science Laboratory, also known as the Curiosity rover, landed successfully on the red planet.


(One of Curiosity’s first pictures from Mars. According to the official NASA description, this image was “taken through a ‘fisheye’ wide-angle lens on the left ‘eye’ of a stereo pair of Hazard-Avoidance cameras on the left-rear side of the rover. The image is one-half of full resolution. The clear dust cover that protected the camera during landing has been sprung open. Part of the spring that released the dust cover can be seen at the bottom right, near the rover’s wheel.”)

Here’s the full story from Spaceflight Now. Congratulations to the spacecraft’s designers, builders, launch team, and operators on the pinpoint approach and the success of the “sky crane” that deposited the rover safely on the surface. Well done!

The rover landed in Gale Crater, which pleases me immensely since the main character of my novel is named Gale (nicknamed “Stormie”). I may need to add a suitable reference in the text.

As I wrote in a recent related post, I look forward to Curiosity’s trek and discoveries.

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Anticipating a Mars Landing, Remembering A Mars Lander

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As we get ready for the landing of the Curiosity rover, a bit of space history: 5 years ago today — August 4, 2007 — a Delta II rocket launched from Cape Canaveral carrying the Phoenix Mars Lander.


(Phoenix Mars Lander. NASA conceptual image.)

The Phoenix was designed to analyze soil samples dug from below the Martian surface. It landed in Mars’ north polar region on 25 May 2008:

Fourteen minutes before touchdown, and about 7 minutes before atmospheric entry (defined as reaching an altitude of 125 km) the cruise stage was jettisoned. The spacecraft entered the atmosphere and the heat shield initially slowed the craft. After about 3 minutes the parachute deployed, followed by ejection of the heat shield 15 seconds later, deployment of landing legs 10 seconds after that, and radar activation 50 seconds later. At 1 km altitude the parachute was released and a powered descent and soft-landing was achieved using a pulsed propulsion system with 8 thrusters, which turned off when footpad sensors detected touchdown.

In terms of the Martian year, the spacecraft landed near the summer solstice, at a high enough latitude that the sun would be above the horizon for several more months. This provided ample power through the summer months, but ensured that when winter came the craft would not be able to replenish its batteries. As a result, the mission came to an end when the lander sent its last transmission on 2 November 2008. And according to this mission page, Mars Reconnaissance Orbiter images taken in 2010 showed that winter snow and ice damaged the lander’s solar panels.

Phoenix confirmed the presence of water ice on Mars, and also determined that the Martian soil is moderately alkaline.

And as we post this, the Mars Science Laboratory, Curiosity, is on course for the red planet. We look forward to the landing, and some new discoveries!

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Last of the Pre-Apollo Lunar Orbiters

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Forty-five years ago today — August 1, 1967 — Lunar Orbiter 5 was launched by an Atlas Agena from Cape Canaveral.


(Lunar Orbiter 5. NASA image.)

As noted, Lunar Orbiter 5 was the last of the series, “designed to to take additional Apollo and Surveyor landing site photography and to take broad survey images of unphotographed parts of the Moon’s far side.”

The spacecraft acquired photographic data from August 6 to 18, 1967, and readout occurred until August 27, 1967. A total of 633 high resolution and 211 medium resolution frames at resolution down to 2 meters were acquired, bringing the cumulative photographic coverage by the 5 Lunar Orbiters to 99% of the Moon’s surface.

Mission Control commanded Lunar Orbiter 5 to de-orbit and hit the lunar surface five months after its photography mission was completed.

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Testing Tethers in Space History

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Twenty years ago today — July 31, 1992 — the Space Shuttle Atlantis launched from the Kennedy Space Center on an international science mission.


(Tethered Satellite System. The tether itself is partly in shadow in this NASA image.)

STS-46 included U.S. astronauts Loren J. Shriver, Andrew M. Allen, Marsha S. Ivins, Jeffrey A. Hoffman and Franklin R. Chang-Diaz, Swiss astronaut Claude Nicollier, and Italian astronaut Franco Malerba.

Though technical problems delayed operations, the crew successfully deployed the European Space Agency’s European Retrievable Carrier (EURECA), an experiment-filled platform that stayed in orbit almost a year before being retrieved by the shuttle Endeavour. The Tethered Satellite System (TSS), a joint NASA/Italian Space Agency venture to test the behavior of tethers in space, did not deploy as planned; however, as a test, it proved that extending tethers in space is a more difficult and delicate task than anticipated.

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Riding the Earth's Wake, and Farewell to a Space Pioneer

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To start this space history item off in the usual fashion: 20 years ago today — July 24, 1992 — a Delta II launch vehicle carried the Geotail satellite to orbit from Cape Canaveral.

Geotail was built by Japan’s Institute of Space and Aeronautical Science as one of the International Solar Terrestrial Physics (ISTP) missions to study the interactions between the Earth and the Sun. Geotail primarily studied the magnetotail, a region formed by the solar wind interacting with the Earth’s magnetic field.

___

Unfortunately, we close this post by saying goodbye to a lady who made space history: physicist and astronaut Dr. Sally Ride, the first U.S. woman in space. Dr. Ride died yesterday of pancreatic cancer. Here’s a very nice profile from Spaceflight Now.


(Sally Ride. NASA image.)

Farewell, Sally Ride.

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Revolutionizing Civilian Remote Sensing: The Launch of Landsat 1

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Forty years ago today — July 23, 1972 — the Earth Resources Technology Satellite (ERTS) 1 launched from Vandenberg AFB atop a Delta rocket.

Renamed Landsat 1, the satellite was the first to demonstrate global remote sensing for “agricultural and forestry resources, geology and mineral resources, hydrology and water resources, geography, cartography, environmental pollution, oceanography and marine resources, and meteorological phenomena.”


(Landsat images of Mount St Helens. NASA image.)

According to this Landsat page, the choice of wavelengths for Landsat’s multispectral scanner (MSS) “was primarily based on forestry and geologic applications that had traditionally used Color IR photography.” At the time, multispectral imaging was “secondary and highly experimental,” according to this page, but scientists soon recognized the utility of the multispectral data.

The spacecraft operated until January 1978, five years longer than expected.

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For Want of a Hyphen, the Spacecraft Was Lost

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Fifty years ago today — July 22, 1962 — an Atlas Agena rocket launched from Cape Canaveral, carrying the Mariner 1 spacecraft.


(Artist’s conception of Mariner 1. NASA image.)

Mariner 1 was intended to fly by the planet Venus. The flight was nominal

until an unscheduled yaw-lift (northeast) maneuver was detected by the range safety officer. Faulty application of the guidance commands made steering impossible and were directing the spacecraft towards a crash, possibly in the North Atlantic shipping lanes or in an inhabited area.

Range safety destroyed the vehicle 4 minutes and 53 seconds into the launch.

The launch failure investigation found two apparent causes. First, the “Atlas airborne beacon equipment” did not operate properly. In addition,

the omission of a hyphen in coded computer instructions in the data-editing program allowed transmission of incorrect guidance signals to the spacecraft. During the periods the airborne beacon was inoperative the omission of the hyphen in the data-editing program caused the computer to incorrectly accept the sweep frequency of the ground receiver as it sought the vehicle beacon signal and combined this data with the tracking data sent to the remaining guidance computation. This caused the computer to swing automatically into a series of unnecessary course corrections with erroneous steering commands which finally threw the spacecraft off course.

Anyone who has done any computer coding knows how critical even a single character can be. In this case, it cost an entire spacecraft. The Venus flyby would have to wait.

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What I Believe About What You Believe

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When our beliefs differ, and they often do, and especially when we clash over our beliefs, it’s good for you to know what I believe about what you believe.

I believe that you have the right to express what you believe.

I believe that you believe that what you’re telling me is good and true and right.

I don’t believe that your belief obligates me to believe the same thing.

I believe that I have the right to express what I believe.

I don’t believe that you must believe what I believe, even if I believe it’s good and true and right.

I believe that we should express our beliefs thoughtfully, respectfully, and politely.

I believe that we can converse, be acquainted, and maybe be friends, even if we believe different things.

But if you believe that I must believe what you believe, then I hope we can at least part on friendly terms.

___


(Punctuation makes a difference, I think.)

I guess this post is my way of trying to take responsibility for my own beliefs. That’s hard enough without trying to take responsibilty for anyone else’s.

Respectfully submitted,
G

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Lunar 'Explorer' Launched

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Forty-five years ago today — July 19, 1967 — Explorer 35 launched from Cape Canaveral on a Thor-Delta rocket.


(Explorer 35. NASA image.)

Explorer 35 was designed to study the solar wind — specifically, “the interplanetary plasma, magnetic field, energetic particles, and solar X rays” — in the vicinity of the Moon.

According to this mission page, the Explorer 35 launch was the 50th Thor-Delta mission — quite an accomplishment for the launch vehicle team.

Explorer 35 entered its elliptical lunar orbit on July 21st and began six years of observations. The spacecraft “found that the Moon has no magnetosphere, enabling the charged particles of the solar wind to hit the lunar surface,” and effectively creating a “cavity” in the solar wind. It was finally turned off on June 24, 1973.

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