In 1993, the science astronomers Eugene and Carolyn Shoemaker and David Levy were the first to discover this famous comet.It is said that this comet first broke out in July 1992 and burst into headlines after the incident. The incident was that this comet collided with Jupiter in July 1994 and became the first observed collision of the Solar System for humans.The comet Shoemaker-Levy 9 was named because it is the ninth periodic comet that was discovered by Shoemakers and David Levy together. It was their 11th comet discovery, including the observations of two aperiodic comets that use different terminology than other discovered comets by Earth. Because of that, these two comets were not recognized by science observations and were hence declined. This discovery of Shoemaker-Levi 9 was announced at IAU Circular 5725 on March 26, 1993. The discovery photo first showed that comet Shoemaker-Levy 9 was a rare comet because it was about 50 arcseconds long and had several nuclei in 10 elongated regions. It seemed to indicate the arc second width. The Central Bureau for Astronomical Telegraphs, Brian G. Marsden, said that the comet is only about four degrees away from Jupiter when viewed from Earth, which may be in a line of sight at around a few thousand miles. Still, the apparent movement in the sky was that of the comet. He said it indicates that they are physically close than seemed to Jupiter.Calculations show that its odd fragmented shape was due to its previous approach to Jupiter in July 1992. At that time, the orbit of comet P/Shoemaker-Levy 9 was within the Roche boundary of Jupiter, and the tidal force of Jupiter was acting to pull the comet apart. The comet was later observed as a series of debris up to 1.2 mi (2 km) in diameter. This debris collided with Jupiter’s Southern Hemisphere at high speed between July 16 and 22, 1994. The striking scars of the impact were more easily visible than the Great Red Spot and lasted for months.If you like reading about the amazing facts on the Shoemaker-Levy 9 and are curious to know more about the Solar System, planets, meteors, and asteroids, then do check our other articles on shape of the Earth and spheres of the Earth here on Kidadl.What is Shoemaker-Levy 9 made of?When Shoemaker-Levi 9 was first spotted near Jupiter in July 1994, astronomers thought it was a moon, but when further analyzed, they found no moons or objects in that area. The astronomers were elated as this was the first time they saw an object called a comet so close to the planet.The appearance of Shoemaker-Levi 9 was very unusual as it consisted of at least 12 active comet nuclei stretched on bright pearly strings. In addition, a total of 21 fragments were seen as the nucleus spread further away. Like every other found comet, it was believed that comet Shoemaker-Levy 9 was also made up of the leftovers of the solar system, i.e., dust, frozen rock, and ice. Normally they range in width from a few kilometers to tens of kilometers, but as they orbit near the Sun, they heat up and spew dust and gas into their glowing heads, which can be larger than planets.How was comet Shoemaker-Levy 9?Shoemaker-Levy 9 or also known as SL9, was a famous comet pulled in by Jupiter as it was orbiting the planet at that time. It was seen in a photo taken with an 18 in (45.7 cm) Schmidt Hubble space telescope at the Palomar Observatory in the state of California on the night of March 24, 1993. This is the first active giant comet observed to be orbiting the planet and may have been captured by planet Jupiter about 20-30 years ago but later after observation, was found by Earth in July 1994.Back when tracing the comet Shoemaker-Levy 9 orbit, it was found to be orbiting Jupiter for some time. The capture could have taken place in the 1960s but could have been captured from the solar orbit in the early 1970s. There were several other observers, including Kin Endate from a photo taken on March 15, S. Otomo taken on March 17, and a team led by Eleanor Helin Pictures from March 19. There they found an image of a comet in the Precovery image taken earlier. The photo plate from March 19 was taken by M. Lindgren on March 21, a project looking for a comet near Jupiter. However, his team expected the comet to be inactive or at best with a weak dust coma, but the comet P/Shoemaker-Levy 9 had a unique morphology, so its true nature would not be recognized until when the official announcement came five days later. No records of early detection dating back to March 1993 were found. Before Jupiter captured the comet, it may have been a short-period comet with an aphelion just inside Jupiter’s orbit and a perihelion inside the asteroid belt.What happened when comet Shoemaker-Levy 9 collided with Jupiter?The comet Shoemaker-Levy 9 collided and struck Jupiter in July 1994 with so much force that the temperature of Jupiter’s atmosphere rose with great heights. The Shoemaker-Levy 9 left a dark, ring-shaped scar when collided, that was eventually extinguished by the wind of Jupiter.Comets have shattered and collided with Jupiter and its satellites in the past, according to convincing evidence. Planetary scientists discovered 13 crater chains on Callisto and three on Ganymede during the Voyager missions to the planet, the origins of which were formerly unknown.The well-known discovery of comet Shoemaker-Levy 9 and the very fact that it will likely impact Jupiter had caused great excitement both inside and outside the astronomy community, as astronomers had never in their career witnessed two major Solar System bodies collide. The comet was extensively studied, and when its orbit was determined more accurately, the possibility of the collision became quite certain. Collisions would provide scientists with a unique opportunity to explore Jupiter’s atmosphere, as they were expected to cause eruptions of matter from the layers normally hidden beneath the cloud tops.The force was so much that the large object started to lurk almost to near-Earth from Jupiter. All these effects were very dramatic, but it wasn’t just a show. It gave scientists the opportunity to gain and experience new insights into Jupiter between the comet Shoemaker-Levy 9 and the common space collisions. Researchers were able to infer the composition and structure of the comet. The collisions also left dust floating in Jupiter’s cloud tops. Scientists were able to track Jupiter’s high-altitude winds for the very first time by observing the dust that spreads throughout Jupiter. Scientists were able to study their relationship by comparing changes in the magnetosphere with changes in Jupiter’s atmosphere after a collision of the Shoemaker and Levy’s ninth comet with the famed planet Jupiter.What was the Shoemaker-Levy 9 impact?According to the science observations, if objects like comet Shoemaker-Levy 9 or any objects that are bigger hit or even just slightly touch the Earth, the impact would be beyond disastrous. One of the reasons can be that the Earth is smaller in size than Jupiter.When the comet Shoemaker-Levy 9 began slowly approaching Jupiter, space telescope observatories like Galileo spacecraft, ROSAT X-ray-observing satellite, Hubble Space Telescope, and many other spacecraft observatories trained their astronomers to use terrestrial telescopes and observe Jupiter.The impact occurred on the side of Jupiter that is not quite visible from Earth, but Galileo’s spacecraft was at a distance of 1.6 AU from the planet and could see the impact when they occurred. Minutes after Jupiter’s collision, the rapid rotation of Jupiter allowed observers on the ground to see the point of the impact of the collision. The first impact of comet Shoemaker-Levy 9 on Jupiter occurred at 20:13 UTC on July 16 when Galileo discovered a fireball that reached a peak temperature of approximately 42,740.3 F (24,000 K) in just 40 seconds after the impact.The fireball cloud quickly reached an altitude of over 1,864.1 mi (3,000 km). Just a few minutes after the impact and the discovery of the fireball clouds, Galileo measured rewarming, where the temperature started to warm again. This happened probably due to the released material that keeps falling onto the planet. The Hubble Space Telescope Observers on Earth discovered fireball clouds shortly after Jupiter’s collision and observed that the fireball had risen beyond the edge of the planet. Observers saw a huge dark spot that may or may not have been clouds shortly after the first impact. This spot was visible through a very small telescope and was about 25,000 mi (40233.6 km) across the planet (almost the radius of the Earth). Subsequent dark spots were thought to be apparently asymmetrical, forming a crescent shape in front of the direction of the impact caused by the debris. Basically, the impact released debris and dust into the sky. Later, even after six days after the collisions, the impact is observed.Did You Know…There is a thing known as a typical meteor which is created by a grain-sized object and can start at altitudes above 62.1 mi (100 km). Meteoroids less than 0.019 in (500 μm) in diameter are too thin to see with the naked eye but can be seen with binoculars and telescopes. They can also be detected by radar. Bright meteors ranging from the brilliance of Venus to the brilliance of the full moon are less common, but in practice, they are not uncommon. These are produced by meteoroids with masses ranging from a few grams to about 2204.6 lb (1 ton).By far, the largest asteroid found by Earth is 1 Ceres which is 591.5 mi (952 km) in diameter. This asteroid contains about 25% of the combined mass of all asteroids. The next largest asteroids are 2 Pallas with a diameter of 248.5-326.2 mi (400-525 km), 4 Vesta, and 10 Hygiea. In comparison to these asteroids, the Shoemaker Levi 9 is very small as it is 0.9 mi (1.4 km) in diameter.The scars from the impact were visible on Jupiter for months. They were very noticeable, and the event observers described them as even more noticeable than the Great Red Spot. According to a search of historical observations, the spot is probably the most prominent transit feature ever seen on Earth, and the Great Red Spot event is noteworthy for its striking color, but the effects of Shoemaker Levi 9 have been so far recorded before and after it became clear that it was not the size and darkness of the affected spots.Spectral observers have found that for at least 14 months after the collision, ammonia and carbon disulfide remain in the atmosphere, with significant amounts of ammonia in the stratosphere, in contrast to its normal position in the troposphere. As a result, the world’s stratospheric temperature rose immediately after the collision, fell below the pre-collision temperature a few weeks later, and then slowly rose to room temperature.Here at Kidadl, we have carefully created lots of interesting family-friendly facts for everyone to enjoy! If you liked our suggestions for 11 amazing Shoemaker-Levy 9 facts for curious kids then why not take a look at mud dauber sting: curious facts on spider bite revealed or moons of Neptune: amazing solar system facts for kids?
In 1993, the science astronomers Eugene and Carolyn Shoemaker and David Levy were the first to discover this famous comet.
