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{{Infobox comet {{Infobox comet
| name = C/1921 H1 (Dubiago) | name = C/1921 H1 (Dubiago)
| discovery_ref = {{r|IAUC_20}}
| discoverer = ] | discoverer = ]
| discovery_site = ] | discovery_site = ]
| discovery_date = 24 April 1921 | discovery_date = 24 April 1921
| designations = 1921c{{r|ICQ1}}<br>1921 I
| orbit_ref = {{r|jpl}} | orbit_ref = {{r|jpl}}
| epoch = 21 May 1921 (] 2422830.5) | epoch = 21 May 1921 (] 2422830.5)
Line 24: Line 26:
| M2 = | M2 =
| magnitude = 10.5<br/><small>(1921 apparition)</small> | magnitude = 10.5<br/><small>(1921 apparition)</small>
| last_p = 5 May 1921<br><small>(last observation)</small><br>9 August 1982<br><small>(calculated)</small> | last_p = 5 May 1921<br><small>(last observation)</small><br>9 August 1982{{r|Yoshida_2006}}<br><small>(calculated)</small>
| next_p = 25 June 2041 | next_p = 25 June 2041{{r|Yoshida_2006}}
}} }}


'''Dubiago's Comet''', formally known as '''C/1921 H1''' by its modern nomenclature, is a faint ] that completes an orbit around the ] once every 61–79 years.{{r|cometography}} It was predicted to return in 1982, but it was not observed. It will next return to the inner Solar System by 2041. '''Dubiago's Comet''', formally known as '''C/1921 H1''' by its modern nomenclature, is a faint ] that completes an orbit around the ] once every 61–79 years.{{r|cometography}} It was predicted to return in 1982, but it was not observed. It will next return to the inner Solar System by 2041.{{r|Yoshida_2006}}

== Discovery and observations ==
The comet was first spotted from the ] on the evening of 24 April 1921.{{r|cometography}} Initially, the discovery of the comet was incorrectly credited to ], but the attribution was later clarified to ] a year later.{{r|PASP_1922a|PASP_1922b}}


== References == == References ==
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| date= 2003 | date= 2003
| access-date= 20 September 2024 }} | access-date= 20 September 2024 }}
</ref>

<ref name="IAUC_20">{{cite journal
| author1= G. Lecointe
| title= Comète Dubiago (1921c)
| url= http://www.cbat.eps.harvard.edu/IAUCs/BCITA20a.jpg
| journal= Central Bureau for Astronomical Telegrams
| volume= 20
| date= 20 May 1921
| language= fr }}
</ref>

<ref name="ICQ1">{{cite web
| title= Comet Names and Designations
| url= http://www.icq.eps.harvard.edu/names1.html
| website= International Comet Quarterly
| access-date= 25 December 2024 }}
</ref> </ref>


Line 48: Line 70:
| publisher= ] | publisher= ]
| access-date= 4 January 2024 }} | access-date= 4 January 2024 }}
</ref>

<ref name="PASP_1922a">{{cite journal
| title= Report of the Comet Medal Committee
| url= https://iopscience.iop.org/article/10.1086/123250/pdf
| journal= Publications of the Astronomical Society of the Pacific
| year= 1922
| volume= 34
| issue= 197
| pages= 72
| doi= 10.1086/123250
| doi-access= free }}
</ref>

<ref name="PASP_1922b">{{cite journal
| title= Ninety-Eighth Award of the Donohue Comet Medal (A Correction)
| url= https://iopscience.iop.org/article/10.1086/123251/pdf
| journal= Publications of the Astronomical Society of the Pacific
| year= 1922
| volume= 34
| issue= 199
| pages= 163
| doi= 10.1086/123251
| doi-access= free }}
</ref>

<ref name="Yoshida_2006">{{cite web
| author1= S. Yoshida
| title= C/1921 H1 (Dubiago)
| url= http://www.aerith.net/comet/catalog/1921H1/index.html
| website= www.aerith.net
| date= 6 August 2006
| access-date= 26 December 2024 }}
</ref> </ref>


Latest revision as of 06:11, 26 December 2024

Halley-type comet
C/1921 H1 (Dubiago)
Discovery
Discovered byAlexander Dubyago
Discovery siteKazan Observatory
Discovery date24 April 1921
Designations
Alternative designations1921c
1921 I
Orbital characteristics
Epoch21 May 1921 (JD 2422830.5)
Observation arc40 days
Number of
observations		27
Aphelion33.088 AU
Perihelion1.1161 AU
Semi-major axis17.102 AU
Eccentricity0.93474
Orbital period70.73 years
Inclination22.345°
Longitude of
ascending node		67.127°
Argument of
periapsis		97.481°
Last perihelion5 May 1921
(last observation)
9 August 1982
(calculated)
Next perihelion25 June 2041
TJupiter1.496
Earth MOID0.384 AU
Jupiter MOID0.817 AU
Physical characteristics
Apparent magnitude10.5
(1921 apparition)

Dubiago's Comet, formally known as C/1921 H1 by its modern nomenclature, is a faint Halley-type comet that completes an orbit around the Sun once every 61–79 years. It was predicted to return in 1982, but it was not observed. It will next return to the inner Solar System by 2041.

Discovery and observations

The comet was first spotted from the Kazan Observatory on the evening of 24 April 1921. Initially, the discovery of the comet was incorrectly credited to Dmitri Dubyago, but the attribution was later clarified to Alexander Dubyago a year later.

References

  1. G. Lecointe (20 May 1921). "Comète Dubiago (1921c)". Central Bureau for Astronomical Telegrams (in French). 20.
  2. "Comet Names and Designations". International Comet Quarterly. Retrieved 25 December 2024.
  3. ^ S. Yoshida (6 August 2006). "C/1921 H1 (Dubiago)". www.aerith.net. Retrieved 26 December 2024.
  4. "C/1921 H1 (Dubiago) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 4 January 2024.
  5. ^ G. W. Kronk (2003). "C/1921 H1 (Dubiago)". Cometography.com. Retrieved 20 September 2024.
  6. "Report of the Comet Medal Committee". Publications of the Astronomical Society of the Pacific. 34 (197): 72. 1922. doi:10.1086/123250.
  7. "Ninety-Eighth Award of the Donohue Comet Medal (A Correction)". Publications of the Astronomical Society of the Pacific. 34 (199): 163. 1922. doi:10.1086/123251.

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