C/2001 OG108 (LONEOS)

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]

C/2001 OG108 (LONEOS)
Discovery
Discovered byM. E. Van Ness[1]
LONEOS telescope at Lowell Observatory
Discovery date28 July 2001[2]
Orbital characteristics
Epoch15 December 2001[3]
(JD 2452258.5)
Aphelion25.606 AU (Q)
Perihelion0.99404 AU (q)
Semi-major axis13.300 AU (a)
Eccentricity0.92526
Orbital period48.51 yr
Inclination80.245°
Last perihelion2002-Mar-15[3]
Next perihelion2050-Jun-07[4]
Earth MOID0.3 AU (45 million km)
Physical characteristics
Dimensions13.6 ± 1.0 km[3]

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]

C/2001 OG108 (LONEOS) Closest Earth Approach on 2147-Mar-23 11:20 UT[3]
Date & time of
closest approach		 Earth distance
(AU)		 Sun distance
(AU)		 Velocity
wrt Earth
(km/s)		 Velocity
wrt Sun
(km/s)		 Uncertainty
region
(3-sigma)		 Reference
2147-03-23 11:20 ± 13:380.42 AU (63 million km; 39 million mi; 160 LD)1.35 AU (202 million km; 125 million mi; 530 LD)40.335.3± 2 million kmHorizons

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.[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.[3]

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]

See also

References
  1. Abell, Paul A.; Fernández, Yanga R.; Pravec, Petr; French, Linda M.; Farnham, Tony L.; Gaffey, Michael J.; Hardersen, Paul S.; Kušnirák, Peter; Šarounová, Lenka; Sheppard, Scott S. (2003). "Physical Characteristics of Asteroid-like Comet Nucleus C/2001 OG108 (LONEOS)". 34th Annual Lunar and Planetary Science Conference: 1253. Bibcode:2003LPI....34.1253A.
  2. French, Linda M. (2002). "Pre-Activity BVRI Colors of High-Inclination Comet C/2001 OG108 (LONEOS)". American Astronomical Society, DPS Meeting No. 34, #16.01. 34: 868. Bibcode:2002DPS....34.1601F.
  3. "JPL Small-Body Database Browser: C/2001 OG108 (LONEOS)" (last observation: 2002-07-03; arc: 340 days). Jet Propulsion Laboratory. Archived from the original on 24 July 2020. Retrieved 18 May 2011.
    (Close approach uncertainty: (MaxDist of 0.434) – (MinDist of 0.408) * 149597870.7 = 3.9 million km)
  4. "Horizons Batch for C/2001 OG108 (LONEOS) on 2050-Jun-07" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 20 January 2023. (JPL#42/Soln.date: 2021-Apr-15)
  5. "JPL Small-Body Database Search Engine: comets and q < 1 (au) and period < 200 (years)". JPL Solar System Dynamics. Retrieved 24 July 2020.
  6. "Horizons Batch for 2147-Mar-23 Earth Approach". JPL Horizons. Archived from the original on 20 January 2023. Retrieved 20 January 2023.
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