| Discovery | |
|---|---|
| Discovered by | M. E. Van Ness |
| Discovery site | Lowell Observatory (LONEOS) |
| Discovery date | 28 July 2001 |
| Orbital characteristics | |
| Epoch | 5 December 2001 (JD 2452248.5) |
| Observation arc | 340 days |
| Number of observations | 882 |
| Aphelion | 25.606 AU |
| Perihelion | 0.994 AU |
| Semi-major axis | 13.300 AU |
| Eccentricity | 0.92526 |
| Orbital period | 48.51 years |
| Inclination | 80.245° |
| Longitude of ascending node | 10.555° |
| Argument of periapsis | 116.42° |
| Last perihelion | 15 March 2002 |
| Next perihelion | 7 June 2050 |
| TJupiter | 0.597 |
| Earth MOID | 0.301 AU |
| Jupiter MOID | 0.968 AU |
| Physical characteristics | |
| Dimensions | 13.6 ± 1.0 km (8.45 ± 0.62 mi) |
| Synodic rotation period | 57.12 hours |
| Geometric albedo | 0.054 |
| Comet total magnitude (M1) | 13.3 |
C/2001 OG108 (LONEOS) is a Halley-type comet with an orbital period of 48.51 years. It was discovered on 28 July 2001 by the LONEOS telescope at Lowell Observatory. 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.
Orbit
Observations taken in January and February 2002 showed that the "asteroid" had developed a small amount of cometary activity as it approached perihelion. It was subsequently reclassified as a comet. The comet came to perihelion (closest approach to the Sun) on 15 March 2002. It will come to aphelion in 2026 and the next perihelion passage is calculated to be on 7 June 2050. On 23 March 2147 the comet will pass about 0.42 AU (63 million km; 160 LD) from Earth with an uncertainty region of about ±2 million km.
| 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 ± 13:38 | 0.42 AU (63 million km; 39 million mi; 160 LD) | 1.35 AU (202 million km; 125 million mi; 530 LD) | 40.3 | 35.3 | ± 2 million km | Horizons |
This comet probably represents the transition between typical Halley-family/long-period comets and extinct comets. Damocloids have been studied as possible extinct cometary candidates due to the similarity of their orbital parameters with those of Halley-family comets.
Physical properties
The comet has a rotational period of 2.38 ± 0.02 days (57.12 hr).
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). 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)
See also
References
- ^ P. A. Abell; Y. R. Fernández; P. Pravec; L. M. French; T. L. Farnham; et al. (2003). Physical Characteristics of Asteroid-like Comet Nucleus C/2001 OG108 (LONEOS). 34th Annual Lunar and Planetary Science Conference. p. 1253. Bibcode:2003LPI....34.1253A.
- ^ L. M. French (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.
- ^ "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)
- ^ "C/2001 OG108 (LONEOS) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 18 May 2011.
- "JPL Small-Body Database Search Engine: comets and q < 1 (au) and period < 200 (years)". JPL Solar System Dynamics. Retrieved 24 July 2020.
- "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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