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{{Infobox comet {{Infobox comet
| name = C/1889 O1 (Davidson) | name = C/1889 O1 (Davidson)
| discovery_ref = {{r|mackay_museum}}
| discoverer = ] | discoverer = ]
| discovery_site = ], Australia | discovery_site = ]
| discovery_date = 19 July 1889 | discovery_date = 19 July 1889
| designations = 1889e{{r|ICQ1}}<br>1889 IV | designations = 1889e{{r|ICQ1}}<br>1889 IV
Line 13: Line 14:
| aphelion = 869.38 AU | aphelion = 869.38 AU
| semimajor = 435.21 AU | semimajor = 435.21 AU
| period = | period = ~9,100 years
| eccentricity = 0.997611 | eccentricity = 0.997611
| inclination = 65.992° | inclination = 65.992°
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| physical_ref = {{r|Kronk_2003}} | physical_ref = {{r|Kronk_2003}}
| M1 = 6.5 | M1 = 6.5
| M2 = | M2 = 5.0–6.0
| magnitude = 4.0<br><small>(1889 apparition)</small> | magnitude = 4.0<br><small>(1889 apparition)</small>
| last_p = 19 July 1889 | last_p = 19 July 1889
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'''Comet Davidson''', formal designation '''C/1889 O1''', is a ] that became visible to the naked eye in 1889. '''Comet Davidson''', formal designation '''C/1889 O1''', is a ] that became visible to the naked eye in 1889.

== Discovery and observations ==
Australian colonist ] first spotted his comet through a telescope from his personal observatory on the night of 19 July 1889.{{r|mackay_museum}} By coincidence, it is also the day of its perihelion.{{r|jpl}} He later reported his discovery to the ] on 22 July 1889, noting it as a tail-less object now visible with the naked eye, located within the constellation ].{{r|Nature_1889}}{{efn|Reported initial position upon confirmation was: ] {{=}} {{RA|12|46|9}}, ] {{=}} {{DEC|122|29|6}}{{r|Nature_1889}}}} The comet's ] was reported to be around magnitude 5.0–6.0,{{r|Millosevich_1889}} with a ] about 5 arcminutes in diameter.{{r|Ellery_1889}}

By 24 July 1889, ] reported that the comet brightened to magnitude 4.0, with its nucleus surrounded by an extensive coma.{{r|Kronk_2003}} As the comet started to fade away in the following days, it was observed that its nucleus split into two fragments on 3 August 1889.{{r|Ricco_1889}}


== References == == References ==
=== Notes ===
{{Notelist}}

=== Citations ===
{{Reflist|refs= {{Reflist|refs=

<ref name="Ellery_1889">{{cite journal
| author1= R. L. J. Ellery
| title= Observations of Comet 1889 IV (Davidson)
| url= https://ui.adsabs.harvard.edu/link_gateway/1889AN....123...91E/ADS_PDF
| journal= Astronomische Nachrichten
| year= 1889
| volume= 123
| issue= 6
| pages= 91–92
| bibcode= 1889AN....123...91E
| doi= 10.1002/asna.18901230606 }}
</ref>


<ref name="ICQ1">{{cite web <ref name="ICQ1">{{cite web
Line 58: Line 81:
| pages= 639–643 | pages= 639–643
| isbn= 978-0-521-58505-7 }} | isbn= 978-0-521-58505-7 }}
</ref>

<ref name="mackay_museum">{{cite web
| author1= D. Jesser
| title= Davidson's Comet
| url= https://www.mackayhistoricalsociety.com/davidson-comet
| website= Mackay Historical Society
| access-date= 2 January 2025 }}
</ref>

<ref name="Millosevich_1889">{{cite journal
| author1= E. Millosevich
| title= Osservazioni della cometa 1889...(Davidson)
| trans-title= Observations of the comet 1889...(Davidson)
| url= https://ui.adsabs.harvard.edu/link_gateway/1889AN....122..187M/ADS_PDF
| journal= Astronomische Nachrichten
| year= 1889
| volume= 122
| issue= 10
| pages= 187–190
| bibcode= 1889AN....122..187M
| doi= 10.1002/asna.18891221004
| language= it }}
</ref>

<ref name="Nature_1889">{{cite journal
| title= Our Astronomical Column
| url= https://www.nature.com/articles/040328a0.pdf
| journal= Nature
| year= 1889
| volume= 40
| pages= 328–329
| doi= 10.1038/040328a0 }}
</ref>

<ref name="Ricco_1889">{{cite journal
| author1= A. Ricco
| title= Osservazioni della cometa 1889 IV
| trans-title= Observations of the comet 1889 IV
| url= https://ui.adsabs.harvard.edu/link_gateway/1889AN....123..205R/ADS_PDF
| journal= Astronomische Nachrichten
| year= 1889
| volume= 123
| issue= 13
| pages= 205–208
| bibcode= 1889AN....123..205R
| doi= 10.1002/asna.18901231305
| language= it }}
</ref> </ref>


Latest revision as of 00:39, 4 January 2025

Non-periodic comet
C/1889 O1 (Davidson)
Discovery
Discovered byJohn Ewen Davidson
Discovery siteMackay, Queensland
Discovery date19 July 1889
Designations
Alternative designations1889e
1889 IV
Orbital characteristics
Epoch17 July 1889 (JD 2411200.5)
Observation arc115 days
Number of
observations		92
Aphelion869.38 AU
Perihelion1.0397 AU
Semi-major axis435.21 AU
Eccentricity0.997611
Orbital period~9,100 years
Inclination65.992°
Longitude of
ascending node		287.712°
Argument of
periapsis		345.862°
Last perihelion19 July 1889
TJupiter0.526
Physical characteristics
Comet total
magnitude (M1)		6.5
Comet nuclear
magnitude (M2)		5.0–6.0
Apparent magnitude4.0
(1889 apparition)

Comet Davidson, formal designation C/1889 O1, is a non-periodic comet that became visible to the naked eye in 1889.

Discovery and observations

Australian colonist John Ewen Davidson first spotted his comet through a telescope from his personal observatory on the night of 19 July 1889. By coincidence, it is also the day of its perihelion. He later reported his discovery to the Melbourne Observatory on 22 July 1889, noting it as a tail-less object now visible with the naked eye, located within the constellation Centaurus. The comet's nucleus was reported to be around magnitude 5.0–6.0, with a coma about 5 arcminutes in diameter.

By 24 July 1889, John Tebbutt reported that the comet brightened to magnitude 4.0, with its nucleus surrounded by an extensive coma. As the comet started to fade away in the following days, it was observed that its nucleus split into two fragments on 3 August 1889.

References

Notes

  1. Reported initial position upon confirmation was: α = 12 46 9, δ = 122° 29′ 6″

Citations

  1. ^ D. Jesser. "Davidson's Comet". Mackay Historical Society. Retrieved 2 January 2025.
  2. "Comet Names and Designations". International Comet Quarterly. Retrieved 2 January 2025.
  3. ^ "C/1889 O1 (Davidson) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 24 November 2023.
  4. ^ G. W. Kronk (2003). Cometography: A Catalog of Comets. Vol. 2: 1800–1899. Cambridge University Press. pp. 639–643. ISBN 978-0-521-58505-7.
  5. ^ "Our Astronomical Column" (PDF). Nature. 40: 328–329. 1889. doi:10.1038/040328a0.
  6. E. Millosevich (1889). "Osservazioni della cometa 1889...(Davidson)" [Observations of the comet 1889...(Davidson)]. Astronomische Nachrichten (in Italian). 122 (10): 187–190. Bibcode:1889AN....122..187M. doi:10.1002/asna.18891221004.
  7. R. L. J. Ellery (1889). "Observations of Comet 1889 IV (Davidson)". Astronomische Nachrichten. 123 (6): 91–92. Bibcode:1889AN....123...91E. doi:10.1002/asna.18901230606.
  8. A. Ricco (1889). "Osservazioni della cometa 1889 IV" [Observations of the comet 1889 IV]. Astronomische Nachrichten (in Italian). 123 (13): 205–208. Bibcode:1889AN....123..205R. doi:10.1002/asna.18901231305.

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