| Revision as of 15:04, 28 December 2024 editKyloRen2017 (talk | contribs)Extended confirmed users5,057 editsm →External links← Previous edit | Latest revision as of 23:09, 2 January 2025 edit undoKyloRen2017 (talk | contribs)Extended confirmed users5,057 editsm Source book of X/1987 A2 by Brian G. Marsden | ||
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| {{short description|Periodic comet}} | {{short description|Periodic comet}} | ||
| {{For|other comets discovered by Gregory J. Leonard|Comet Leonard (disambiguation)}} | |||
| {{Infobox comet | {{Infobox comet | ||
| | name = 449P/Leonard | | name = 449P/Leonard | ||
| Line 32: | Line 33: | ||
| }} | }} | ||
| '''449P/Leonard''' is a periodic comet that orbits the ] once every 6.83 years.{{r|baa-periodic}} Studies in 2022 show that 449P was a rediscovery of a previously lost comet that was spotted in 1987.{{r|MPEC_2022-T74}} | '''449P/Leonard''' is a periodic comet that orbits the ] once every 6.83 years.{{r|baa-periodic}} Studies in 2022 show that 449P was a rediscovery of a previously lost comet that was spotted in 1987.{{r|CBET_5173|MPEC_2022-T74}} | ||
| == Discovery and observations == | == Discovery and observations == | ||
| On 29 September 2020, ] discovered a new comet about 21.5 in apparent magnitude from images taken from the {{cvt|1.5|m|in}} telescope of the ].{{r|MPEC_2020-U151}} Orbital calculations showed it had reached its most recent perihelion on 23 November 2020, and it has frequent close passes with ], where the comet had passed about {{convert|0.064|AU|e6km|abbr=unit}} from the giant planet in 1983,{{r|jpl}} reducing its orbital period from 13.2 years to just 6.82 years.{{r|Kronk_2024}} | On 29 September 2020, ] discovered a new comet about 21.5 in apparent magnitude from images taken from the {{cvt|1.5|m|in}} telescope of the ].{{r|MPEC_2020-U151}} Orbital calculations showed it had reached its most recent perihelion on 23 November 2020, and it has frequent close passes with ], where the comet had passed about {{convert|0.064|AU|e6km|abbr=unit}} from the giant planet in 1983,{{r|jpl}} reducing its orbital period from 13.2 years to just 6.82 years.{{r|Kronk_2024}} | ||
| In 2022, ] linked the 449P with the previously ], '''X/1987 A2''', which was discovered by ] and ] from the ] on 5 January 1987.{{r|Kronk_2024}} This ] image of the comet was not found until March 1987,{{r|IAUC_4355}} hence precise follow-up observations were not possible at the time.{{r|baa-periodic}} Subsequently, scientists have also identified '''P/2013 Y6''' as another previous apparition of the comet, which was observed from the ] between 2013 and 2014.{{r|MPEC_2022-T74}} | In 2022, ] linked the 449P with the previously ], '''X/1987 A2''',{{r|Marsden_1996}} which was discovered by ] and ] from the ] on 5 January 1987.{{r|CBET_5173|Kronk_2024}} This ] image of the comet was not found until March 1987,{{r|IAUC_4355}} hence precise follow-up observations were not possible at the time.{{r|baa-periodic}} Subsequently, scientists have also identified '''P/2013 Y6''' as another previous apparition of the comet, which was observed from the ] between 2013 and 2014.{{r|MPEC_2022-T74}} | ||
| The comet will next return to the inner Solar System on 25 September 2027.{{r|Yoshida_2022}} | The comet will next return to the inner Solar System on 25 September 2027.{{r|Yoshida_2022}} | ||
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| | archive-url= https://web.archive.org/web/20240713103158/https://people.ast.cam.ac.uk/~jds/per4050.htm#449P | | archive-url= https://web.archive.org/web/20240713103158/https://people.ast.cam.ac.uk/~jds/per4050.htm#449P | ||
| | url-status= live }} | | url-status= live }} | ||
| ⚫ | </ref> | ||
| ⚫ | <ref name="CBET_5173">{{cite journal | ||
| ⚫ | | author1= D. W. Green | ||
| | title= Comet P/2020 S6 {{=}} X/1987 A2 {{=}} P/2013 Y3 (Leonard) | |||
| | url= http://www.cbat.eps.harvard.edu/iau/cbet/005100/CBET005173.txt | |||
| | journal= Central Bureau for Astronomical Telegrams | |||
| | date= 6 October 2022 | |||
| | volume= 5173 }} | |||
| </ref> | </ref> | ||
| Line 59: | Line 69: | ||
| | title= Possible Comets | | title= Possible Comets | ||
| | url= http://www.cbat.eps.harvard.edu/iauc/04300/04355.html | | url= http://www.cbat.eps.harvard.edu/iauc/04300/04355.html | ||
| | journal= |
| journal= International Astronomical Union Circulars | ||
| | volume= 4355 | | volume= 4355 | ||
| | date= 31 March 1987 }} | | date= 31 March 1987 }} | ||
| Line 70: | Line 80: | ||
| | publisher= ] | | publisher= ] | ||
| | access-date= 28 December 2024 }} | | access-date= 28 December 2024 }} | ||
| </ref> | |||
| <ref name="Kronk_2024">{{cite book | |||
| | author1= G. W. Kronk | |||
| ⚫ | | author2= M. Meyer | ||
| ⚫ | | title= Catalog of Unconfirmed Comets | ||
| ⚫ | | url= https://books.google.com/books?id=nxoLEQAAQBAJ&pg=PA354 | ||
| ⚫ | | volume= 2: 1900–Present | ||
| ⚫ | | year= 2024 | ||
| ⚫ | | publisher= ] | ||
| ⚫ | | pages= 353–354 | ||
| ⚫ | | isbn= 978-3-031-56691-2 | ||
| ⚫ | | issn= 2509-3118 }} | ||
| </ref> | |||
| <ref name="Marsden_1996">{{cite book | |||
| | author1= B. G. Marsden | |||
| | author2= G. V. Williams | |||
| | title= Catalogue of Cometary Orbits | |||
| | publisher= ] | |||
| | edition= 11th | |||
| | year= 1996 | |||
| | page= 108 | |||
| | bibcode= 1996cco..book.....M | |||
| | asin= B0006P0NTM | |||
| | isbn= 978-0-894-90095-2 }} | |||
| </ref> | </ref> | ||
| Line 88: | Line 124: | ||
| | date= 21 October 2020 | | date= 21 October 2020 | ||
| | access-date= 28 December 2024 }} | | access-date= 28 December 2024 }} | ||
| ⚫ | </ref> | ||
| ⚫ | <ref name=" |
||
| ⚫ | | author1= |
||
| ⚫ | | author2= M. Meyer | ||
| ⚫ | | title= Catalog of Unconfirmed Comets | ||
| ⚫ | | url= https://books.google.com/books?id=nxoLEQAAQBAJ&pg=PA354 | ||
| ⚫ | | volume= 2: 1900–Present | ||
| ⚫ | | year= 2024 | ||
| ⚫ | | publisher= ] | ||
| ⚫ | | pages= 353–354 | ||
| ⚫ | | isbn= 978-3-031-56691-2 | ||
| ⚫ | | issn= 2509-3118 }} | ||
| </ref> | </ref> | ||
| Line 123: | Line 146: | ||
| ] | ] | ||
| ] | ] | ||
| ] | |||
| ] | |||
| ] | ] | ||
Latest revision as of 23:09, 2 January 2025
Periodic comet For other comets discovered by Gregory J. Leonard, see Comet Leonard (disambiguation).| Discovery | |
|---|---|
| Discovered by | Gregory J. Leonard |
| Discovery site | Mount Lemmon Obs |
| Discovery date | 29 September 2020 |
| Designations | |
| MPC designation | X/1987 A2 P/2013 Y3 P/2020 S6 |
| Alternative designations | PK20S060 PJ87A020 PK13Y030 KM1987-1 |
| Orbital characteristics | |
| Epoch | 20 October 2020 (JD 2459142.5) |
| Observation arc | 12,458 days (34.11 years) |
| Earliest precovery date | 5 January 1987 |
| Number of observations | 294 |
| Aphelion | 5.322 AU |
| Perihelion | 1.875 AU |
| Semi-major axis | 3.598 AU |
| Eccentricity | 0.47899 |
| Orbital period | 6.82 years |
| Inclination | 15.459° |
| Longitude of ascending node | 242.571° |
| Argument of periapsis | 176.652° |
| Last perihelion | 23 November 2020 |
| Next perihelion | 25 September 2027 |
| TJupiter | 2.853 |
| Earth MOID | 0.8872 AU |
| Jupiter MOID | 0.0613 AU |
| Physical characteristics | |
| Comet total magnitude (M1) | 8.6 |
| Comet nuclear magnitude (M2) | 17.7 |
| Apparent magnitude | 17.5 (1987 apparition) |
449P/Leonard is a periodic comet that orbits the Sun once every 6.83 years. Studies in 2022 show that 449P was a rediscovery of a previously lost comet that was spotted in 1987.
Discovery and observations
On 29 September 2020, Gregory J. Leonard discovered a new comet about 21.5 in apparent magnitude from images taken from the 1.5 m (59 in) telescope of the Mount Lemmon Observatory. Orbital calculations showed it had reached its most recent perihelion on 23 November 2020, and it has frequent close passes with Jupiter, where the comet had passed about 0.064 AU (9.6 million km) from the giant planet in 1983, reducing its orbital period from 13.2 years to just 6.82 years.
In 2022, Maik Meyer linked the 449P with the previously lost comet, X/1987 A2, which was discovered by Robert H. McNaught and Malcolm Hartley from the Siding Spring Observatory on 5 January 1987. This precovery image of the comet was not found until March 1987, hence precise follow-up observations were not possible at the time. Subsequently, scientists have also identified P/2013 Y6 as another previous apparition of the comet, which was observed from the Mauna Kea Observatory between 2013 and 2014.
The comet will next return to the inner Solar System on 25 September 2027.
References
- ^ "MPEC 2020-U151: Comet P/2020 S6 (Leonard)". www.minorplanetcenter.net. Minor Planet Center. 21 October 2020. Retrieved 28 December 2024.
- ^ "MPEC 2022-T74: Comet P/2020 S6 = P/1987 A2 = P/2013 Y3 (Leonard)". www.minorplanetcenter.net. Minor Planet Center. 21 October 2020. Retrieved 28 December 2024.
- ^ G. W. Kronk; M. Meyer (2024). Catalog of Unconfirmed Comets. Vol. 2: 1900–Present. Springer Nature. pp. 353–354. ISBN 978-3-031-56691-2. ISSN 2509-3118.
- ^ "449P/Leonard – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 28 December 2024.
- ^ S. Yoshida. "449P/Leonard". www.aerith.net. Retrieved 28 December 2024.
- ^ J. Shanklin. "BAA Comet Section: Periodic Comets 400–499". University of Cambridge. Archived from the original on 13 July 2024. Retrieved 28 December 2024.
- ^ D. W. Green (6 October 2022). "Comet P/2020 S6 = X/1987 A2 = P/2013 Y3 (Leonard)". Central Bureau for Astronomical Telegrams. 5173.
- B. G. Marsden; G. V. Williams (1996). Catalogue of Cometary Orbits (11th ed.). International Astronomical Union. p. 108. ASIN B0006P0NTM. Bibcode:1996cco..book.....M. ISBN 978-0-894-90095-2.
- D. W. Green (31 March 1987). "Possible Comets". International Astronomical Union Circulars. 4355.
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