Aperiodic comet,trackbyparabolaOr hyperboliccomet, because you can only approach the sun once in your life, and once you leave, you will never return. It is called an aperiodic comet.This kind of comet is not a member of the solar system, but a passer-by from outside the solar system, who accidentally intrudedsolar systemAnd then return to the vast depths of the universe without hesitation.[1]
Aperiodic cometDefined ascometOfOrbital periodIn 200 years or more, including comets that only return once, they will only pass through the interior of the solar system once.They usually have near parabolic orbits, so they will not return to the sun for thousands of years.(Please note that some long-term aperiodic comets refer to comets that will never return to the vicinity of the sun.)
The official naming of aperiodic comets begins with "C";Comets that are no longer returning or may have disappeared begin with "D", includingD/1770 L1, which is considered to be subject toJupiterInfluence and change the orbit.
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along withPrimitive starThe pressure and temperature inside the star will reach the critical value to ignite the hydrogen core, so the nuclear fuel inside the star will start to burn.During the process when the nuclear fuel inside the star starts to burn and glow, that is, the initial stage when the star starts to shine strongly, the temperature of the whole star starts to rise sharply, causing the volume of the star to expand explosively in a very short time, which causes the explosion of the star to be very huge, and a large amount of materials in the liquid hydrogen ocean wrapped in the outer layer of the star will be immediatelyStellar atmosphereA large amount of material in and countless asteroids in low Earth orbit around the huge star ring around the star are ejected, which not only makes the star lose its originalStellar atmosphereAnd the huge star ring also reduces the angular momentum of the star's rotation.
Since the material on the ejected stellar ring has angular momentum surrounding the star itself, according toConservation law of angular momentum, most of them will orbit the star along an oblate elliptical orbitcomet、meteorWandering in the form ofsolar systemAnd a small part of the material hitsMercury, VenusearthOn other planets, a few materials that move very fast can leave the solar system and enter the vast Milky Way. One day, when they fly near other stars, they will form aperiodic comets of other stars.
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solar systemInPeriodic cometIt is mainly formed by the original solar atmosphere 4.5 billion years ago and the material in the huge star ring surrounding the sun. The solar projection makes the periodic comet like a satellite that has been re launched from the circular orbit around the sun, and has to orbit the sun along an extremely long elliptical orbit.
However, the aperiodic comet produced by the ejection of his star, due to its extremely fast movement speed, exceeds the separation speed required to break away from the sun's gravity. Once it is far away from the sun, it will never return.
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McHoltz
On August 27, 2005, Comet "McHoltz" was discovered by American astronomers, and its number was C/2004Q2.The comet has two tails, spreading in opposite directions, which is very beautiful.It is easy to see with the naked eye in places far away from the interference of city lights.With a small binocular, you can see the hazy comet head and slender tail.
Deer forest
Comet Lulin is one of the three comets discovered by Chinese amateur astronomers in recent years.The comet is composed ofSun Yat sen University, GuangzhouYe Quanzhi, an undergraduate, collaborated with Lin Qisheng, an observation assistant at the Lulin Observatory of the Astronomical Research Institute of the Central University in Taiwan, and made the discovery on July 11, 2007.International Astronomical UnionIt is named Comet "C/2007N3".This is also one of the most famous discoveries made by domestic astronomers.
The Chinese meaning of "C/2007N3" comet is: "The third confirmed comet in the first half of July 2007 is an aperiodic comet" (that is, there is only this observation opportunity, and the next return will be more than 28 million years later).At present, it has entered the best observation period.The comet is the closest to the earth around February 24, about 60 million kilometers, with brightness of 4 to 5 stars. If the weather is fine, the comet can be seen with the naked eye.At that time, Comet Lulin will be in Leo with Saturn.It has two tails. Ordinary astronomers can use astronomical telescopes or simpleBinocularsLulin Comet can be observed.
List of aperiodic comets
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Comet discoverer or homonym, date of discovery
Comet Arend Roland (C/1956 R11957 Ⅲ, 1956 h) Arend and Roland, November 8, 1956
Comet Beljawsky (C/1911 S31911 Ⅳ, 1911g) Beljawsky, September 29, 1911
Comet Bennett (C/1969 Y11970 Ⅱ, 1969i) Bennett, December 28, 1969
Comet Bradfield (C/2004 F4) Bradfield, April 12, 2004
Comet Creek (C/1911 O11911 V, 1911c), July 21, 1911 comet de Kock Paraskevopoulos (C/1941 B21941 Ⅳ, 1941c) de Kock, January 15, 1941 and Paraskevopoulos, January 23, 1941
The eclipsed comet (C/1948 V11948 XI, 1948 l) was first detected in Nairobi during the full solar eclipse on November 1, 1948 (huge about? 2)
The Comet of Tough Bopp (C/1995 O1) Tough and Bopp, one of only five known comets on July 23, 1995, has a negative absolute giant (? 2.7) Comet Humason (C/1961 R11962 Ⅷ, 1961 e) Humason, September 1, 1961
Comet Hyakutake (C/1996 B2) Hyakutake, January 30, 1996
Comet Kohoutek (C/1973 E11973 XII, 1973f) Kohoutek, March 7, 1973
Comet LONEOS (C/2007 F1) LONEOS, March 19, 2007
Comet Lulin (C/2007 N3) Ye Quanzhi and Lin Kaiai Sheng, Lulin Observatory, July 11, 2007
Comet Machholz (C/2004 Q2) Machholz, August 27, 2004
Comet McNaught (C/2006 P1, the great comet 2007) Robert McNaught, August 7, 2006 (the largest bright light? 5m)
Comet McNaught Russell (C/1993 Y11994 XI, 1993v) Robert HMcNaught，Kenneth S. Russell Comet Mrkos (C/1957 P11957 V, 1957 d), December 17, 1993 Mrkos, July 29, 1957
Neat Comet (C/2001 Q4) Neat, August 24, 2001
Comet Pojma ń ski (C/2006 A1) Pojma ń ski, January 2, 2006
Comet Seki line (C/1962 C 1962 III, 1962 c, Reitberg Blakesen, Khokhlov) Seki and line, February 4, 1962
Comet Skjellerup Maristany (C/1927 X 1927 Ⅸ, 1927k) Skjellerup, November 28, 1927 and Maristany, December 6, 1927
Comet Skorichenko George (C/1989 Y11990 Ⅵ, 1989e1) Skorichenko and George, December 17, 1989
The Great Comet of the South (C/1947 X11947 XII, 1947n) December 7, 1947 C/2006 M4 (Swan) Matson and Mattiazzo, June 20, 2006
Comet in the West (C/1975 V11976 Ⅵ, 1975n), August 10, 1975
Comet of white Ortiz Bolelli (C/1970 K11970 Ⅵ, 1970f), white, May 18, 1970, Ortiz, May 21, 1970 and Bolelli, May 22, 1970
Comet Wilson Hubbard (C/1961 O11961 V, 1961d, Drakesen, Portlock Weinberg) Wilson and Hubbard, July 23, 1961
