January 11: Lunar Prospector

Lunar Prospector entered lunar orbit on January 11, 1998.

The Lunar Prospector mission was the third selected by NASA for full development and construction as part of the Discovery Program. At a cost of $62.8 million, the 19-month mission was designed for a low polar orbit investigation of the Moon, including mapping of surface composition and possible polar ice deposits, measurements of magnetic and gravity fields, and study of lunar outgassing events. The mission ended July 31, 1999, when the orbiter was deliberately crashed into a permanently shadowed area of the Shoemaker crater near the lunar south pole in an unsuccessful attempt to detect the presence of water.

Data from the mission allowed the construction of a detailed map of the surface composition of the Moon, and helped to improve understanding of the origin, evolution, current state, and resources of the Moon. Several articles on the scientific results were published in the journal Science.

Lunar Prospector was managed out of NASA Ames Research Center with the prime contractor Lockheed Martin. The Principal Investigator for the mission was Dr. Alan Binder. 

The probe also carried a small amount of the remains of Dr. Eugene Shoemaker (April 28, 1928 – July 18, 1997), astronomer and co-discoverer of Comet Shoemaker-Levy 9, to the moon for a space burial.

January 11: William Tyler Olcott

The Astronomy Compendium: January 11

July 29: Mikhail Tikhonravov

Luna 3

Mikhail Tikhonravov

July 29, 1900 - March 3, 1974

Mikhail Klavdievich Tikhonravov, soviet pioneer of spacecraft design and rocketry. Mikhail Klavdievich attended the Zhukovsky Air Force Academy from 1922 to 1925, where he built gliders and was exposed to Konstantin Tsiolkovsky's ideas of spaceflight. In 1932, he joined GIRD, as one of the four brigade leaders. His brigade built the GIRD-09 rocket, fueled by liquid oxygen and jellied gasoline, and launched on August 17, 1933.

Tikhonravov remained in GIRD as it evolved into RNII, the jet propulsion institute, and then NII-1. In 1946, he became deputy chief of NII-4 in the Academy of Artillery Science. There, he lead a team of researchers that did important studies on packet rockets, satellite orbital motion, optimal pitch control programs for launching into orbit, reentry trajectories and heat shielding. This team designed Sputnik-3, Luna-1, Luna-3, Luna-4 and the early Venus and Mars probes. In 1956, Sergey Korolev had Tikhonravov and his team transferred into his bureau, OKB-1.

Tikhonravov Crater on Mars is named in his honor.

May 8: James H. "Dutch" Kindelberger

James H. "Dutch" Kindelberger

May 8, 1895 - July 27, 1962

James Kindelberger was an American pioneer of aviation. He was also a leader of North American Aviation for a number of years. The International Aerospace Hall of Fame inducted Kindelberger in 1977.

Kindelberger was born in Wheeling, West Virginia, to German immigrants. His parents taught him the typical German virtues; he always believed in hard work, orderliness and punctuality. In World War I he was a member of the US Army Air Service.

North American Aviation was a major US aircraft manufacturer, responsible for a number of historic aircraft, including the T-6 Texan trainer, the P-51 Mustang fighter, the B-25 Mitchell bomber, the F-86 Sabre jet fighter, and the X-15 rocket plane, as well as Apollo Command and Service Module, the second stage of the Saturn V rocket, the Space Shuttle orbiter and the B-1 Lancer. Through a series of mergers and sales, North American Aviation is now part of Boeing.

Kindelberger became the president and general manager of North American Aviation in 1934. He was promoted to chairman and chief executive officer in 1948, with Lee Atwood replacing him as president. In 1960, Atwood took over as chief executive when Kindelberger retired. Kindelberger remained chairman of the board until his death in 1962. "Under his guidance, North American Aviation broke technological barriers; produced propeller- and jet-powered fighters and bombers, military trainers, rocket engines, and rocket-powered aircraft; and began its role as the prime contractor for the country's space program". Between the years 1935 and 1967, North American Aviation (under Kindelberger's direction) built more military aircraft than any other airplane maker in U.S. history. Kindelberger was recently honored in a documentary by filmmaker William Winship. "Pioneers in Aviation: The Race to the Moon", which profiles four of America's legendary aerospace pioneers --William Boeing, Donald Douglas, Dutch Kindelberger, and James McDonnell --whose achievements led the nation and the world from the era of open-cockpit biplanes to the very threshold of Space. 

After World War II Atwood expected there would be a need for improved rocket engines based on those developed by the Germans for the V-2. The two decided in 1946 to invest $1 million in a rocket engine test facility in Santa Susanna, California, and a supersonic wind tunnel at Los Angeles International Airport. This paid off when North American landed the contract to develop the Navaho, a rocket-boosted intercontinental cruise missile. Navaho allowed North American to develop expertise in rocket engines, inertial navigation systems, and supersonic aerodynamics. This in turn led to securing contracts for many advanced aerospace vehicles in the late 1950s - the X-15 manned hypersonic spaceplane, the Hound Dog missile, and the XB-70 Valkyrie triple-sonic bomber. The XB-70 required the company to develop new materials, welding, and manufacturing processes.

March 10: MRO Attained Martian Orbit

MRO attained Martian orbit on March 10, 2006

NASA's Mars Reconnaissance Orbiter (MRO) is a multipurpose spacecraft designed to conduct reconnaissance and exploration of Mars from orbit.

When MRO entered orbit there were five other spacecraft in orbit of or on Mars: Mars Global Surveyor, Mars Express, Mars Odyssey, and two Mars Exploration Rovers; a then record for most spacecraft operational in Mars vicinity. The $720 million USD spacecraft was built by Lockheed Martin under the supervision of the Jet Propulsion Laboratory. It was launched August 12, 2005, and attained Martian orbit on March 10, 2006. In November 2006, after five months of aerobraking, it entered its final science orbit and began its primary science phase.

MRO is modeled after NASA's highly successful Mars Global Surveyor to conduct surveillance of Mars from orbit. Early specifications of the satellite included a large camera to take high resolution pictures of Mars. In this regard, Jim Garvin, the Mars exploration program scientist for NASA, proclaimed that MRO would be a "microscope in orbit". The satellite was also to include a visible-near-infrared spectrograph.

MRO contains a host of scientific instruments such as cameras, spectrometers, and radar, which are used to analyze the landforms, stratigraphy, minerals, and ice of Mars. It paves the way for future spacecraft by monitoring daily weather and surface conditions, studying potential landing sites, and hosting a new telecommunications system. MRO's telecommunications system will transfer more data back to Earth than all previous interplanetary missions combined, and MRO will serve as a highly capable relay satellite for future missions.

MRO is using its on-board scientific equipment to study the Martian climate, weather, atmosphere, and geology, and to search for signs of water in the polar caps and underground. In addition, MRO is looking for the remains of the previously lost Mars Polar Lander and Beagle 2 spacecraft, and serves as the first step in setting up an internet protocol network for the planets in our solar system. After its main science operations are completed, the probe's extended mission is to be the communication and navigation system for landers and rover probes.

February 20: Ranger 8 reached the Moon

Ranger 8 reached the Moon

February 20, 1965

On February 20, 1965, Ranger 8 swept an oblique course over the south of Oceanus Procellarum and Mare Nubium, to crash in Mare Tranquillitatis where Apollo 11 would land 4½ years later. It garnered more than 7,000 images, covering a wider area and reinforcing the conclusions from Ranger 7.

Ranger 8 was a spacecraft designed to achieve a lunar impact trajectory and to transmit high-resolution photographs of the lunar surface during the final minutes of flight up to impact. The spacecraft carried six television vidicon cameras, two wide angle (channel F, cameras A and B) and four narrow angle (channel P) to accomplish these objectives. The cameras were arranged in two separate chains, or channels, each self-contained with separate power supplies, timers, and transmitters so as to afford the greatest reliability and probability of obtaining high-quality video pictures. No other experiments were carried on the spacecraft.

Ranger 8 was launched on February 17, 1965 and reached the Moon on February 20, 1965. The first image was taken at 9:34:32 UT at an altitude of 2510 km. Transmission of 7,137 photographs of good quality occurred over the final 23 minutes of flight. The final image taken before impact has a resolution of 1.5 meters. The spacecraft encountered the lunar surface in a direct hyperbolic trajectory, with incoming asymptotic direction at an angle of -13.6 degrees from the lunar equator. The orbit plane was inclined 16.5 degrees to the lunar equator. After 64.9 hours of flight, impact occurred at 09:57:36.756 UT on February 20, 1965 in Mare Tranquillitatis at approximately 2.67 degrees N, 24.65 degrees E. (The impact site is listed as about 2.72° N, 24.61° E in the initial report "Ranger 8 Photographs of the Moon".) Impact velocity was slightly less than 2.68 km/s. The spacecraft performance was excellent.

The Ranger program was a series of unmanned space missions by the United States in the 1960s whose objective was to obtain the first close-up images of the surface of the Moon. The Ranger spacecraft were designed to collide with the lunar surface, returning imagery until they were destroyed upon impact.

Ranger was originally designed, beginning in 1959, in three distinct phases, called "blocks". Each block had different mission objectives and progressively more advanced system design. The JPL mission designers planned multiple launches in each block, to maximize the engineering experience and scientific value of the mission and to assure at least one successful flight. Total research, development, launch, and support costs for the Ranger series of spacecraft (Rangers 1 through 9) was approximately $170 million.

February 5: Mariner 10 flyby of Venus

Mariner 10 passed Venus on February 5, 1974, 

at a closest range of 5,768 km at 17:01 UT

Mariner 10 was a robotic space probe launched on November 3, 1973 to fly by the planets Mercury and Venus. It was launched approximately 2 years after Mariner 9 and was the last spacecraft in the Mariner program (Mariner 11 and 12 were re-purposed to the Voyager program and redesignated Voyager 1 and Voyager 2). 

Mariner 10 was the seventh successful launch in the Mariner series and the first spacecraft to visit Mercury. It was also the first spacecraft to use the gravitational pull of one planet (Venus) to reach another (Mercury), and the first spacecraft mission to visit two planets. The spacecraft flew by Mercury three times in a retrograde heliocentric orbit and returned images and data on the planet. Mariner 10 returned the first-ever close-up images of Venus and Mercury. The primary scientific objectives of the mission were to measure Mercury's environment, atmosphere, surface, and body characteristics and to make similar investigations of Venus. Secondary objectives were to perform experiments in the interplanetary medium and to obtain experience with a dual-planet gravity-assist mission.

Mariner 10 was the first spacecraft to make use of an interplanetary "gravitational slingshot" maneuver, using Venus to bend its flight path and bring its perihelion down to the level of Mercury's orbit. This maneuver, inspired by the orbital mechanics calculations of the Italian scientist Giuseppe Colombo, put the spacecraft into an orbit that repeatedly brought it back to Mercury. Mariner 10 used the solar radiation pressure on its solar panels and its high-gain antenna as a means of attitude control during flight, the first spacecraft to use active solar pressure control.

The spacecraft passed Venus on February 5, 1974, at a closest range of 5768 km at 17:01 UT. Using a near-ultraviolet filter, it photographed the Cytherean chevron clouds and performed other atmospheric studies. It was discovered that extensive cloud detail could be seen via Mariner's ultra-violet camera filters. Venus's cloud cover is nearly featureless in visible light. Earth-based ultra-violet observation did reveal some indistinct blotching even before Mariner 10, but the detail seen by Mariner was a surprise to most researchers.

During its flyby of Venus, Mariner 10 discovered evidence of rotating clouds and a very weak magnetic field.

With its maneuvering gas just about exhausted, Mariner 10 started another orbit of the Sun. Engineering tests were continued until March 24, 1975, when the final depletion of the nitrogen supply was signaled by the onset of an un-programmed pitch turn. Commands were immediately sent to the spacecraft to turn off its transmitter, and radio signals to Earth ceased.

Presently, Mariner 10 is still orbiting the sun, although its on-board electronics have probably been damaged by the sun's radiation.