{
    "count": 4,
    "next": null,
    "previous": null,
    "results": [
        {
            "id": 3959,
            "url": "https://svs.gsfc.nasa.gov/3959/",
            "result_type": "Visualization",
            "release_date": "2012-09-27T00:00:00-04:00",
            "title": "RXTE Views X-ray Pulsar Occulted by the Moon",
            "description": "On Oct. 13, 2010, NASA's Rossi X-ray Timing Explorer (RXTE), a satellite in low-Earth orbit, observed a bursting X-ray pulsar as it was eclipsed by the Moon. This provided scientists with an unusual opportunity to calculate the precise position of the pulsar by timing its disappearance and reappearance at the edge of the Moon's disk.The story began a few days earlier, on Oct. 10, when the European Space Agency's INTEGRAL satellite detected a transient X-ray source in the direction of Terzan 5, a globular star cluster about 25,000 light-years away toward the constellation Sagittarius. This was the start of an extradordinary series of outbursts that ended Nov. 19. The object, dubbed IGR J17480-2446, is classed as a low-mass X-ray binary system, where a neutron star orbits a star much like the Sun and draws a stream of matter from it. As only the second bright X-ray source to be found in Terzan 5, scientists shortened the name of the system to T5X2. As shown in this animation, ingress (the moment when the pulsar disappeared) occurred on the Moon's eastern limb just above the equator. Egress, 8 minutes 32 seconds later, was near the south pole on the western limb. The timing of ingress and egress depended delicately on the shape of the terrain. In other words, it mattered whether the pulsar passed behind a mountain or a valley. So the calculation relied on the detailed topography measured by both JAXA's Kaguya and NASA's Lunar Reconnaissance Orbiter.The animation faithfully reproduces the angle of the Sun, the position of RXTE, the position and orientation of the Moon as seen from the satellite, the Moon's topography, and the starry background. RXTE's position was derived from the Goddard Flight Dynamics Facility ephemeris for day 6129 of the satellite's orbit, while the Sun and Moon positions came from JPL's DE421 solar system ephemeris. All of the positions and the viewing direction were transformed into Moon body-fixed coordinates, so that in the animation software, the Moon remained stationary at the origin, while the camera moved and pointed appropriately. The Moon, the stars, the pulsar, and the clock were all rendered separately and layered together. || ",
            "hits": 75
        },
        {
            "id": 3041,
            "url": "https://svs.gsfc.nasa.gov/3041/",
            "result_type": "Visualization",
            "release_date": "2004-11-01T12:00:00-05:00",
            "title": "Lunar Fly By and Earth Approach",
            "description": "This is an animation flying over the surface of the moon then approaching the earth. It was created in support of a presentation at the National Air and Space Museum (NASM) in October 2004. Scales are not accurate in this visualization. The Earth is about 3 times larger than it would actually appear. The source of the moon texture is unknown; it is thought to be a composite from several missions. The Earth texture was captured as the Galileo spacecraft swung by the Earth in 1990 for a gravity assist on its way to Jupiter. || ",
            "hits": 52
        },
        {
            "id": 79,
            "url": "https://svs.gsfc.nasa.gov/79/",
            "result_type": "Visualization",
            "release_date": "1995-06-09T12:00:00-04:00",
            "title": "Lunar Rotation and Flyby from Clementine Data (with route map)",
            "description": "Clementine was a joint project between the Strategic Defense Initiative Organization and NASA. The objective of the mission was to test sensors and spacecraft components under extended exposure to the space environment and to make scientific observations of the Moon and the near-Earth asteroid 1620 Geographos.  Clementine was launched on 25 January 1994 at 16:34 UTC (12:34 PM EDT) from Vandenberg AFB aboard a Titan II G rocket.  After two Earth flybys, lunar insertion was achieved on February 21. Lunar mapping took place over approximately two months, in two parts. The first part consisted of a 5 hour elliptical polar orbit with a perilune of about 400 km at 28 degrees S latitude. After one month of mapping the orbit was rotated to a perilune of 29 degrees N latitude, where it remained for one more month. This allowed global imaging as well as altimetry coverage from 60 degrees S to 60 degrees N. || ",
            "hits": 100
        },
        {
            "id": 80,
            "url": "https://svs.gsfc.nasa.gov/80/",
            "result_type": "Visualization",
            "release_date": "1995-06-09T12:00:00-04:00",
            "title": "Lunar Rotation and Flyby from Clementine Data",
            "description": "Clementine was a joint project between the Strategic Defense Initiative Organization and NASA. The objective of the mission was to test sensors and spacecraft components under extended exposure to the space environment and to make scientific observations of the Moon and the near-Earth asteroid 1620 Geographos.  Clementine was launched on 25 January 1994 at 16:34 UTC (12:34 PM EDT) from Vandenberg AFB aboard a Titan II G rocket. After two Earth flybys, lunar insertion was achieved on February 21. Lunar mapping took place over approximately two months, in two parts. The first part consisted of a 5 hour elliptical polar orbit with a perilune of about 400 km at 28 degrees S latitude. After one month of mapping the orbit was rotated to a perilune of 29 degrees N latitude, where it remained for one more month.  This allowed global imaging as well as altimetry coverage from 60 degrees S to 60 degrees N. || ",
            "hits": 89
        }
    ]
}