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== Observational history == == Observational history ==
The comet was discovered by ] as a 9th-magnitude object on the early morning skies of 31 May 1930. It was the fifth new comet of the year and the second of three comets he discovered overall.{{r|s2a3}} He immediately informed the ] in ] after an exact position was determined about two days later.{{r|IAUC_285}} The comet was discovered by ] as a 9th-magnitude object on the early morning skies of 31 May 1930. It was the fifth new comet of the year and the second of three comets he discovered overall.{{r|s2a3}} He immediately informed the ] in ] after an exact position was determined about two days later.{{r|IAUC_285|van_Biesbroeck_1930a}}

The comet was already on its outbound flight since it reached perihelion on 10 May 1930, about three weeks before discovery, but was still approaching Earth at the time, allowing it to be regularly observed from Johannesburg until the end of June.{{r|union1}} It was only visible in the southern hemisphere until June 23, when first northern observations were recorded by the ] in ], Greece.{{r|Plakidis_1930}}

] made his first observations of the comet from the ] on June 21, with ] following suit from the ] shortly afterwards,{{r|van_Biesbroeck_1930b}} however by that time it rapidly faded away from magnitude 11 to 15 by the end of the month, though a short ] was reported.{{r|van_Biesbroeck_1930a}} Biesbroeck continued his photographic observations of the comet until July 17, and its last known position was recorded on July 21.{{r|Crommelin_1931}}


== References == == References ==
{{Reflist|refs= {{Reflist|refs=

<ref name="Crommelin_1931">{{cite journal
| author1= A. C. D. Crommelin
| title= Report on Comets in 1930
| url= https://academic.oup.com/mnras/article-pdf/91/1/210/2855778/mnras91-0210.pdf
| journal= Monthly Notices of the Royal Astronomical Society
| volume= 91
| issue= 4
| year= 1931
| page= 376–380
| doi= 10.1093/mnras/91.4.376
| doi-access= free }}
</ref>


<ref name="IAUC_285">{{cite journal <ref name="IAUC_285">{{cite journal
Line 62: Line 79:
</ref> </ref>


<ref name="s2a3"> <ref name="Plakidis_1930">{{cite journal
| author1= S. Plakidis
{{cite web | title= Forbes, Mr. Alexander Forbes Irvine (astronomy) | website=s2a3.org.za | date=15 May 1959 | url=https://www.s2a3.org.za/bio/Biograph_final.php?serial=955 | accessdate=2 August 2019}}
| title= Observations of the Comet Forbes (1930e), made with the Doridis Refractor (Gautier 40 cm.) of the National Observatory of Athens
| url= https://academic.oup.com/mnras/article-pdf/91/1/210/2855778/mnras91-0210.pdf
| journal= Monthly Notices of the Royal Astronomical Society
| volume= 91
| issue= 1
| year= 1930
| page= 210
| doi= 10.1093/mnras/91.1.210
| doi-access= free }}
</ref>

<ref name="s2a3">{{cite web
| author1= C. Plug
| title= Forbes, Mr. Alexander Forbes Irvine (astronomy)
| url=https://www.s2a3.org.za/bio/Biograph_final.php?serial=955
| website= Biographical Database of Southern African Science
| access-date= 2 August 2019 }}
</ref>

<ref name="union1">{{cite journal
| title= Photographic Observations of Comet 1930e (Forbes)
| url= https://ui.adsabs.harvard.edu/link_gateway/1931CiUO...84..172./ADS_PDF
| journal= Circular of the Union Observatory Johannesburg
| volume= 84
| year= 1931
| page= 172
| bibcode= 1931CiUO...84..172. }}
</ref>

<ref name="van_Biesbroeck_1930a">{{cite journal
| author1= G. van Biesbroeck
| title= Comet Notes
| url= https://ui.adsabs.harvard.edu/link_gateway/1930PA.....38..439V/ADS_PDF
| journal= Popular Astronomy
| volume= 38
| year= 1930
| page= 439
| bibcode= 1930PA.....38..439V }}
</ref>

<ref name="van_Biesbroeck_1930b">{{cite journal
| author1= G. van Biesbroeck
| title= Observations of comets at the Yerkes Observatory
| url= https://ui.adsabs.harvard.edu/link_gateway/1930AJ.....41....1V/ADS_PDF
| journal= The Astronomical Journal
| volume= 41
| issue= 949
| year= 1930
| pages= 1–4
| bibcode= 1930AJ.....41....1V
| doi= 10.1086/105006
| doi-access= free }}
</ref> </ref>


Revision as of 00:31, 12 December 2024

Non-periodic comet For other comet discoveries by Alexander F. I. Forbes, see 37P/Forbes and C/1932 Y1 (Dodwell–Forbes).
C/1930 L1 (Forbes)
Discovery
Discovered byAlexander F. I. Forbes
Discovery siteCape Town, South Africa
Discovery date31 May 1930
Designations
Alternative designations1930e
1930 V
Orbital characteristics
Epoch6 June 1930 (JD 2426133.5)
Observation arc49 days
Number of
observations		54
Perihelion1.1528 AU
Eccentricity~1.000
Inclination97.0912°
Longitude of
ascending node		279.265°
Argument of
periapsis		320.966°
Last perihelion10 May 1930
Physical characteristics
Apparent magnitude9.0
(1930 apparition)

Comet Forbes, formally designated as C/1930 L1, is a parabolic comet that was only observed through optical telescopes in the year 1930.

Observational history

The comet was discovered by Alexander F. I. Forbes as a 9th-magnitude object on the early morning skies of 31 May 1930. It was the fifth new comet of the year and the second of three comets he discovered overall. He immediately informed the Union Observatory in Johannesburg after an exact position was determined about two days later.

The comet was already on its outbound flight since it reached perihelion on 10 May 1930, about three weeks before discovery, but was still approaching Earth at the time, allowing it to be regularly observed from Johannesburg until the end of June. It was only visible in the southern hemisphere until June 23, when first northern observations were recorded by the National Observatory in Athens, Greece.

George van Biesbroeck made his first observations of the comet from the Yerkes Observatory on June 21, with Georg von Struve following suit from the Berlin Observatory shortly afterwards, however by that time it rapidly faded away from magnitude 11 to 15 by the end of the month, though a short tail was reported. Biesbroeck continued his photographic observations of the comet until July 17, and its last known position was recorded on July 21.

References

  1. ^ E. Strömgren (4 June 1930). "New Comet Forbes (1930e)". Central Bureau for Astronomical Telegrams. 285.
  2. "Comet Names and Designations". International Comet Quarterly. Retrieved 12 December 2024.
  3. "C/1930 L1 (Forbes) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 12 December 2024.
  4. C. Plug. "Forbes, Mr. Alexander Forbes Irvine (astronomy)". Biographical Database of Southern African Science. Retrieved 2 August 2019.
  5. ^ G. van Biesbroeck (1930). "Comet Notes". Popular Astronomy. 38: 439. Bibcode:1930PA.....38..439V.
  6. "Photographic Observations of Comet 1930e (Forbes)". Circular of the Union Observatory Johannesburg. 84: 172. 1931. Bibcode:1931CiUO...84..172.
  7. S. Plakidis (1930). "Observations of the Comet Forbes (1930e), made with the Doridis Refractor (Gautier 40 cm.) of the National Observatory of Athens" (PDF). Monthly Notices of the Royal Astronomical Society. 91 (1): 210. doi:10.1093/mnras/91.1.210.
  8. G. van Biesbroeck (1930). "Observations of comets at the Yerkes Observatory". The Astronomical Journal. 41 (949): 1–4. Bibcode:1930AJ.....41....1V. doi:10.1086/105006.
  9. A. C. D. Crommelin (1931). "Report on Comets in 1930" (PDF). Monthly Notices of the Royal Astronomical Society. 91 (4): 376–380. doi:10.1093/mnras/91.4.376.

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