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| Discovery A | |
|---|---|
| Discoverer | James V. Scotti, Spacewatch |
| Discovery date | February 15, 1997 |
| Alternate designations B |
1997 CU26 |
| Category | Centaur1 |
| Orbital elements C | |
|
|
|
| Eccentricity (e) | 0.17534 |
| Semi-major axis (a) | 15.87AU |
| Perihelion (q) | 13.08 AU |
| Aphelion (Q) | 18.66 AU |
| Orbital period (P) | 23087.2 d (63.17 years) |
| Mean orbital speed | ? |
| Inclination (i) | 23.375 ° |
| Longitude of the ascending node (Ω) |
300.451 ° |
| Argument of perihelion (ω) |
242.361 ° |
| Mean anomaly (M) | 10.6 ° |
| Physical characteristics D | |
| Diameter | 258.6 ± 10.3 km2 |
| Mass | ? |
| Density | ? |
| Surface gravity | ? |
| Escape velocity | ? |
| Rotation period | ? |
| Spectral class | B-V=0.84; V-R=0.50 |
| Absolute magnitude | 6.41 |
| Albedo (geometric) | 0.05-0.062 |
| Mean surface temperature |
? |
10199 Chariklo (pronounced /kəˈrɪkloʊ/ kə-RIK-loh, /ˈkærɪkloʊ/ KARR-i-kloh, or as in Greek: Χαρικλώ; provisional designation: 1997 CU26) is an asteroid orbiting the Sun between Saturn and Uranus. It is the largest known centaur.
Chariklo was discovered by James V. Scotti of the Spacewatch program on February 15, 1997. Chariklo is named after the nymph Chariclo (Χαρικλω), the wife of Chiron and the daughter of Apollo.
A photometric study in 2001 was unable to find a definite period of rotation.3 Infrared observations of Chariklo indicate water ice4 on the surface.
Contents |
Size
If you know the absolute magnitude (H) and the albedo of an object you can estimate the size. But since centaurs are icy comet like bodies that may outgas, it is very difficult to estimate their albedos. It is also likely that some centaurs albedos vary with time and activity levels.
With an absolute magnitude (H) of 6.41 and an albedo of 0.06,2 Chariklo is currently the largest known centaur with an estimated diameter of 258km.2 2060 Chiron (230km / H=6.5 / albedo=0.07) is likely a close second.2 Lost centaur 1995 SN55 (H=6.0) may even be the largest centaur with an estimated diameter of very close to 300km.
Orbit
Centaurs are believed to have originated from the Kuiper Belt and are in dynamically unstable orbits that will lead either to ejection from the solar system, an impact with a planet or the Sun, or evolution into a short-period comet.5
The orbit of Chariklo is more stable than Nessus, Chiron, and Pholus. Chariklo lies within 0.09 AU of the 4:3 resonance of Uranus and is estimated to have a long orbital half-life of about 10.3 Myr.6
During the perihelic opposition in 2004, Chariklo had an apparent magnitude of +17.7.
References
- ^ a b c "JPL Small-Body Database Browser: 10199 Chariklo (1997 CU26)". 2008-07-03 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Chariklo. Retrieved on 2008-10-21.
- ^ a b c d e John Stansberry, Will Grundy, Mike Brown, Dale Cruikshank, John Spencer, David Trilling, Jean-Luc Margot (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". University of Arizona, Lowell Observatory, California Institute of Technology, NASA Ames Research Center, Southwest Research Institute, Cornell University. http://arxiv.org/abs/astro-ph/0702538v2. Retrieved on 2007-12-03.
- ^ Peixinho; Doressoundiram (2000-11-09). "Photometric study of Centaurs 10199 Chariklo (1997CU26) and 1999UG5". http://aanda.u-strasbg.fr:2002/papers/aa/full/2001/20/aah2535/aah2535.html. Retrieved on 2006-11-09.
- ^ Jewitt; Brown (2001-04-17). "Infrared Observations of Centaur 10119 Chariklo with possible surface variation". http://berlinadmin.dlr.de/SGF/acm2002/abstracts/pshort/16-11p.pdf. Retrieved on 2006-11-09.
- ^ Scott S. Sheppard; David C. Jewitt; Chadwick A. Trujillo (2000). "A WIDE-FIELD CCD SURVEY FOR CENTAURS AND KUIPER BELT OBJECTS". THE ASTRONOMICAL JOURNAL 120: 2687–2694. doi:. http://www.iop.org/EJ/article/1538-3881/120/5/2687/200138.text.html. Retrieved on 21 February 2008.
- ^ Horner, J.; Evans, N.W.; Bailey, M. E. (2004). Simulations of the Population of Centaurs I: The Bulk Statistics. http://arxiv.org/abs/astro-ph?papernum=0407400. Retrieved on 1 September 2008.
See also
- Phoebe (possible former KBO captured by Saturn)
External links
- 37th DPS: Albedos, Diameters (and a Density) of Kuiper Belt and Centaur Objects
- AstDys orbital elements
- Orbital simulation from JPL (Java) / Ephemeris
- Chariklo Photo (February 1999)
- Chariklo's orbit between Saturn and Uranus.
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- This page was last modified on 14 November 2008, at 11:18.
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