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== Discovery and observations == == Discovery and observations ==
The comet was discovered by ] using a {{cvt|15|cm|in}} ] on the dawn of 10 June 1907, however its nature as a comet wasn't confirmed until two days later by ].{{r|Kronk_2007}} At the time, the object was located within the constellation ].{{efn|Reported initial position upon discovery was: ] {{=}} {{RA|23|48.6}}, ] {{=}} {{DEC|–1|08}}{{r|Kronk_2007}}}} The comet was discovered by ] using a {{cvt|15|cm|in}} ] on the dawn of 10 June 1907, however its nature as a comet wasn't confirmed until two days later by ].{{r|Kronk_2007}} At the time, the object was located within the constellation ]{{efn|Reported initial position upon discovery was: ] {{=}} {{RA|23|48.6}}, ] {{=}} {{DEC|–1|08}}{{r|Kronk_2007}}}}


The comet rapidly brightened as it slowly approached the Earth, which at its closest was {{convert|0.757|AU|e6km|abbr=unit}} on 2 August 1907.{{r|Kronk_2007}} ] made a series of photographic observations of the comet between 11 July and 8 September 1907, where he described the comet being visible to the naked eye for two months.{{r|Barnard_1910}} At the same time, ] also made several photographic observations between 12 July and 4 August 1907.{{r|Pickering_1908}} ] noted that the comet had reached magnitude 3.0 on 24 July 1907.{{r|Duncan_1907}} Across the Atlantic, ] made extensive observations of the comet until 27 August.{{r|Wolf_1908a|Wolf_1908b}} The comet rapidly brightened as it slowly approached the Earth, and was closest at {{convert|0.757|AU|e6km|abbr=unit}} on 2 August 1907.{{r|Kronk_2007}} ] made a series of photographic observations of the comet between 11 July and 8 September 1907, where he described the comet being visible to the naked eye for two months.{{r|Barnard_1910}} At the same time, ] also made several photographic observations between 12 July and 4 August 1907.{{r|Pickering_1908}} ] noted that the comet had reached magnitude 3.0 on 24 July 1907.{{r|Duncan_1907}} Across the Atlantic, ] made extensive observations of the comet until 27 August.{{r|Wolf_1908a|Wolf_1908b}}


It was last observed from the ] in ] on the early morning of 30 June 1908.{{r|Kronk_2007}} It was last observed from the ] in ], on the early morning of 30 June 1908.{{r|Kronk_2007}}


== References == == References ==
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| issue= 115 | issue= 115
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{{Comet-stub}}

Latest revision as of 06:07, 5 January 2025

Non-periodic comet For the other comets of the same name, see 33P/Daniel and C/1909 L1 (Borrelly–Daniel).
C/1907 L2 (Daniel)
Daniel's Comet photographed by Max Wolf on 4 August 1907
Discovery
Discovered byZaccheus Daniel
Discovery sitePrinceton, New Jersey
Discovery date10 June 1907
Designations
Alternative designations1907d
1907 IV
Orbital characteristics
Epoch27 September 1907 (JD 2417845.5)
Observation arc344 days
Number of
observations		173
Aphelion830.60 AU
Perihelion0.512 AU
Semi-major axis415.55 AU
Eccentricity0.99877
Orbital period~8,470 years (inbound)
~5,220 years (outbound)
Inclination8.958°
Longitude of
ascending node		144.27°
Argument of
periapsis		294.47°
Last perihelion4 September 1907
TJupiter0.889
Earth MOID0.058 AU
Jupiter MOID0.417 AU
Physical characteristics
Comet total
magnitude (M1)		3.7
Comet nuclear
magnitude (M2)		7.2
Apparent magnitude2.6
(1907 apparition)

Daniel's Comet, formally known as C/1907 L2, is a non-periodic comet that became visible in the naked eye in 1907. It was the first of three comets discovered by American astronomer, Zaccheus Daniel.

Discovery and observations

The comet was discovered by Zaccheus Daniel using a 15 cm (5.9 in) comet-seeker on the dawn of 10 June 1907, however its nature as a comet wasn't confirmed until two days later by William Robert Brooks. At the time, the object was located within the constellation Pisces.

The comet rapidly brightened as it slowly approached the Earth, and was closest at 0.757 AU (113.2 million km) on 2 August 1907. Edward E. Barnard made a series of photographic observations of the comet between 11 July and 8 September 1907, where he described the comet being visible to the naked eye for two months. At the same time, Edward C. Pickering also made several photographic observations between 12 July and 4 August 1907. J. Charles Duncan noted that the comet had reached magnitude 3.0 on 24 July 1907. Across the Atlantic, Max Wolf made extensive observations of the comet until 27 August.

It was last observed from the Chamberlin Observatory in Denver, Colorado, on the early morning of 30 June 1908.

References

Notes

  1. Reported initial position upon discovery was: α = 23 48.6 , δ = –1° 08′

Citations

  1. ^ M. Wolf (1908). "Photographien und Zeichnungen des Kometen 1907d (Daniel)" [Photographs and drawings of the Comet 1907d (Daniel)] (PDF). Abhandlungen der Bayerischen Akademie der Wissenschaften [Proceedings of the Bavarian Academy of Sciences] (in German). 23 (7): 439–443. doi:10.11588/diglit.19637.
  2. "Comet Names and Designations". International Comet Quarterly. Retrieved 4 January 2025.
  3. "C/1907 L2 (Daniel) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 24 November 2023.
  4. ^ G. W. Kronk (2007). Cometography: A Catalog of Comets. Vol. 3: 1900–1932. Cambridge University Press. pp. 110–119. ISBN 978-0-521-58506-4.
  5. E. E. Barnard (1910). "Photographic Observations of Daniel's Comet" (PDF). Proceedings of the American Philosophical Society. 49 (194): 3–16. Bibcode:1910PAPhS..49....3B. JSTOR 983986.
  6. E. C. Pickering (1908). "Photographs of Daniel's Comet, (1907d)". Harvard College Observatory Circular. 144: 2–3. Bibcode:1908HarCi.144R...2P.
  7. J. C. Duncan (1907). "Note on Comet d 1907 (Daniel)" (PDF). Publications of the Astronomical Society of the Pacific. 19 (115): 195–196. JSTOR 40692857.
  8. M. Wolf (1908). "Photographs of Comet d, 1907 (Daniel): Plate 6" (PDF). Monthly Notices of the Royal Astronomical Society. 68 (3): 180–181. doi:10.1093/mnras/68.3.180.

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