a b c d Jewitt, David C. (2002). "From Kuiper Belt Object to Cometary Nucleus: The Missing Ultrared Matter". The Astronomical Journal. 123 (2): 1039–1049. Bibcode: 2002AJ....123.1039J. doi: 10.1086/338692. S2CID 122240711. Nakano, Syuichi (2001). "OAA computing sectioncircular". Oriental Astronomical Association . Retrieved 15 May 2007.

Following the rise in bond yields, Richard Woolnough, a bond fund manager at M&G Investments, points out that the TINA argument is dying. He said: “When bond yields were negative they were guaranteed to go nowhere…but now bonds offer reasonable value versus other asset classes. TINA no longer applies. There is an alternative.” This photo of Halley's comet was taken by the Russian Vega 2 spacecraft, one of two Soviet probes (Vega 1 was the other) to rendezvous with the comet during its 1986 trip through the solar system in March 1986. The closest approach of Vega 1 to Halley was 8890 km while Vega 2 had a close encounter at 8030 km. (Image credit: ESA) Lages, José; Shepelyansky, Dima L.; Shevchenko, Ivan I. (2018). "Kepler map". Scholarpedia. 13 (2): 33238. Bibcode: 2018SchpJ..1333238L. doi: 10.4249/scholarpedia.33238. is set 60 years after the events of 2001: A Space Odyssey and 51 years after those of 2010: Odyssey Two.Victor Willis: A pop-science personality with a prodigious beard, Willis is another of the celebrity passengers. Comet Halley is commonly pronounced / ˈ h æ l i/, rhyming with valley, or / ˈ h eɪ l i/, rhyming with daily. [19] [20] Colin Ronan, one of Edmond Halley's biographers, preferred / ˈ h ɔː l i/, rhyming with crawly. [21] Spellings of Halley's name during his lifetime included Hailey, Haley, Hayley, Halley, Hawley, and Hawly, so its contemporary pronunciation is uncertain, but the version rhyming with valley seems to be preferred by current bearers of the surname. [22] Computation of orbit [ edit ] The orbital path of Halley, against the orbits of the planets ( animation)

a b c d e f g h Yeomans, Donald Keith (1998). "Great Comets in History". Jet Propulsion Laboratory . Retrieved 15 March 2007.

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Chris Iggo, chair of the AXA Investment Management Investment Institute, takes the view that investors should recognise that there is value in the bond market due to high yields, but not jump in and be fully invested just yet. Is Dr. Heywood Floyd an interesting main character? Does he show growth and change in his personality, or does Clarke mainly expose portions of the man's personal history without really developing him as an individual?

The orbits of the Halley-type comets suggest that they were originally long-period comets whose orbits were perturbed by the gravity of the giant planets and directed into the inner Solar System. [42] If Halley was once a long-period comet, it is likely to have originated in the Oort cloud, [43] a sphere of cometary bodies around 20,000–50,000 au from the Sun. Conversely the Jupiter-family comets are generally believed to originate in the Kuiper belt, [43] a flat disc of icy debris between 30 au (Neptune's orbit) and 50 au from the Sun (in the scattered disc). Another point of origin for the Halley-type comets was proposed in 2008, when a trans-Neptunian object with a retrograde orbit similar to Halley's was discovered, 2008 KV 42, whose orbit takes it from just outside that of Uranus to twice the distance of Pluto. It may be a member of a new population of small Solar System bodies that serves as the source of Halley-type comets. [45] In 1687, Sir Isaac Newton published his Philosophiæ Naturalis Principia Mathematica, in which he outlined his laws of gravity and motion. His work on comets was decidedly incomplete. Although he had suspected that two comets that had appeared in succession in 1680 and 1681 were the same comet before and after passing behind the Sun (he was later found to be correct; see Newton's Comet), [24] he was unable to completely reconcile comets into his model. Ne'eman, Yuval (1983). "Astronomy in Israel: From Og's Circle to the Wise Observatory". Tel-Aviv University . Retrieved 15 March 2007.

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The 141AD apparition was recorded in Chinese chronicles. [70] It was also recorded in the Tamil work Purananuru, in connection with the death of the south Indian Chera king Yanaikatchai Mantaran Cheral Irumporai. [71] When the comet was first seen, it appeared in the western sky, its head toward the north and tail towards the south, about horizontal and considerably above the horizon and quite a distance south of the Sun. It could be plainly seen directly after sunset every day, and was visible for a long time, perhaps a month ... a b c "Horizons Batch for 1P/Halley (90000030) on 2023-Dec-09" (Aphelion occurs when rdot flips from positive to negative). JPL Horizons. Archived from the original on 1 July 2022 . Retrieved 1 July 2022. (JPL#73 Soln.date: 2022-Jun-07)

Halley may have been recorded as early as 467BC, but this is uncertain. A comet was recorded in ancient Greece between 468 and 466 BC; its timing, location, duration, and associated meteor shower all suggest it was Halley. [58] According to Pliny the Elder, that same year a meteorite fell in the town of Aegospotami, in Thrace. He described it as brown in colour and the size of a wagon load. [59] Chinese chroniclers also mention a comet in that year. [60] Report of Halley's Comet by Chinese astronomers in 240 BC ( Shiji) There is a group of comets called "Halley family comets" (HFC) because they appear to share the same orbital characteristics of Halley, including being highly inclined to the orbits of Earth and other planets in the solar system. However, this family has a range of inclinations, which prompts other astronomers to suggest they may have a different origin than Halley.

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Halley's Comet, Comet Halley, or sometimes simply Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 75–79 years. [1] Halley is the only known short-period comet that is regularly visible to the naked eye from Earth, and thus the only naked-eye comet that can appear twice in a human lifetime. [15] It last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061. The people believe that it indicates calamity such as war, fire, pestilence, and a change of dynasty. In some places on certain days the doors were unopened for half a day, no water was carried and many did not even drink water as it was rumoured that pestilential vapour was being poured down upon the earth from the comet." [107] Chirikov, Boris V.; Vecheslavov, Vitold V. (1989). "Chaotic dynamics of comet Halley" (PDF). Astronomy and Astrophysics. 221 (1): 146–154. Bibcode: 1989A&A...221..146C.