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C/2001 OG108 (LONEOS)

Halley-type comet From Wikipedia, the free encyclopedia

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C/2001 OG108 (LONEOS) is a Halley-type comet with an orbital period of 48.51 years.[3] It was discovered on 28 July 2001 by the LONEOS telescope at Lowell Observatory.[2] Of the short-period comets with known diameters and perihelion inside the orbit of Earth, C/2001 OG108 is the second largest after Comet Swift–Tuttle.[5]

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Observations taken in January and February 2002 showed that the "asteroid" had developed a small amount of cometary activity as it approached perihelion.[1] It was subsequently reclassified as a comet.[1] The comet came to perihelion (closest approach to the Sun) on 15 March 2002.[3] It will come to aphelion in 2026 and the next perihelion passage is calculated to be on 7 June 2050.[4] On 23 March 2147 the comet will pass about 0.42 AU (63 million km; 160 LD) from Earth[3] with an uncertainty region of about ±2 million km.[6]

More information Date & time of closest approach, Earth distance (AU) ...

This comet probably represents the transition between typical Halley-family/long-period comets and extinct comets.[1] Damocloids have been studied as possible extinct cometary candidates due to the similarity of their orbital parameters with those of Halley-family comets.[1]

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Physical properties

The comet has a rotational period of 2.38 ± 0.02 days (57.12 hr).[1][3]

In 2003, the comet was estimated to have a mean absolute V magnitude (H) of 13.05 ± 0.10, with an albedo of 0.03, giving an effective radius of 8.9 ± 0.7 km (5.53 ± 0.43 mi).[1] Using data from Fernandez (2004–2005) JPL lists the comet with an albedo of 0.05 and a diameter of 13.6 ± 1.0 km (8.45 ± 0.62 mi)[3]

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References

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