(55565) 2002 AW197
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Dwarf-planet candidate 2002 AW197 as taken by the Spitzer Space Telescope on 13 April 2004
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Discovery[1]
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| Discovered by | Michael E. Brown, Chad Trujillo, Eleanor F. Helin, Michael Hicks, Kenneth J. Lawrence, Steven H. Pravdo Palomar Observatory (675) |
| Discovery date | January 10, 2002 |
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Designations
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| MPC designation | (55565) 2002 AW197 |
| Alternate name(s) | none |
| Minor planet category |
Cubewano (MPC)[2] Extended (DES)[3] |
| Epoch December 31, 2006 (JD 2 454 100.5) | |
| Aphelion | 53.503 AU (8.0040 Tm) |
| Perihelion | 41.066 AU (6.1433 Tm) |
| Semi-major axis | 47.284 AU (7.0736 Tm) |
| Eccentricity | 0.132 |
| Orbital period | 325.15 a (118,761 d) |
| Average orbital speed | 4.31 km/s |
| Mean anomaly | 281.945° |
| Inclination | 24.410° |
| Longitude of ascending node | 297.513° |
| Argument of perihelion | 295.307° |
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Physical characteristics
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| Dimensions | 734+116 −108 km[4] 700±50 km[5] |
| Mass | ≈4.1×1020? kg[6] |
| Mean density | 2.0? g/cm3 |
| Equatorial surface gravity | 0.2216? m/s2 |
| Escape velocity | 0.4192? km/s |
| Sidereal rotation period |
8.86h |
| Albedo | 0.117+.04 −.03[4] 0.17±0.03[5] |
| Temperature | ~39–40 K |
| Spectral type | (moderately red) B-V=0.91, V-R=0.56[7] |
| Apparent magnitude | 20.0 (opposition)[8][9] |
| Absolute magnitude (H) | 3.26[10] |
(55565) 2002 AW197 is a classical Kuiper belt object (cubewano). Measurements with the Spitzer Space Telescope have confirmed 2002 AW197 as a reliable dwarf-planet candidate, although it has not been officially classified as such by the IAU. Light-curve-amplitude analysis shows only small deviations, which suggests that 2002 AW197 is a spheroid with small albedo spots.[11] Tancredi (2010) accepts it as a dwarf planet.[12] Mike Brown's automatically updated website lists it as a highly likely dwarf planet.[13]
It was discovered on January 10, 2002, by Michael E. Brown et al.[1] It is located near the Kuiper cliff.
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[edit] Dwarf-planet candidate
Observations of thermal emissions by the Spitzer Space Telescope in 2007 give a diameter of 734+116
−108 km[4] and an albedo of 0.117+.04
−.03.[4] The lower size estimate for a dwarf planet is about 400 km.[14]
[edit] Surface
ESO analysis of spectra reveals a strong red slope and no presence of water ice[15] (in contrast to Quaoar, also red) suggesting organic material (see comparison of colours and typical composition inferred from spectra of the TNOs).
[edit] Distance
It is currently 46.2 AU from the Sun.[8] It will come to perihelion around 2079.[10]
[edit] References
- ^ a b Marsden, Brian G. (2002-07-20). "MPEC 2002-O30 : 2002 AW197". IAU Minor Planet Center. Harvard-Smithsonian Center for Astrophysics. http://www.cfa.harvard.edu/iau/mpec/K02/K02O30.html. Retrieved 2010-01-06.
- ^ "MPEC 2009-R09 :Distant Minor Planets (2009 SEPT. 16.0 TT)". IAU Minor Planet Center. 2009-09-04. http://www.cfa.harvard.edu/mpec/K09/K09R09.html. Retrieved 2009-10-04.
- ^ Marc W. Buie (2009-03-23 using 112 observations). "Orbit Fit and Astrometric record for 55565". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/55565.html. Retrieved 2009-10-04.
- ^ a b c d 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". arXiv:astro-ph/0702538 [astro-ph].
- ^ a b Cruikshank, Dale P.; Stansberry, John A.; Emery, Joshua P.; et al. (2005). "The High-Albedo Kuiper Belt Object (55565) 2002 AW197". The Astrophysical Journal 624 (1): L53–L56. Bibcode 2005ApJ...624L..53C. doi:10.1086/430420.
- ^ Using the 2007 Spitzer spherical radius of 367 km; volume of a sphere * an assumed density of 2 g/cm3 yields a mass (m=d*v) of 4.14E+20 kg
- ^ Tegler, Stephen C. (2007-02-01). "Kuiper Belt Object Magnitudes and Surface Colors". http://www.physics.nau.edu/~tegler/research/survey.htm. Retrieved 2009-12-30.
- ^ a b "AstDys (55565) 2002AW197 Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 2009-04-18. http://www.webcitation.org/query?id=1240086960752667. Retrieved 2009-03-16.
- ^ "HORIZONS Web-Interface". JPL Solar System Dynamics. http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2002AW197. Retrieved 2008-07-02.
- ^ a b "JPL Small-Body Database Browser: 55565 (2002 AW197)". 2005-01-16 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=55565. Retrieved 2008-06-28.
- ^ Tancredi, G., & Favre, S. (2008) Which are the dwarfs in the Solar System?. Depto. Astronomía, Fac. Ciencias, Montevideo, Uruguay; Observatorio Astronómico Los Molinos, MEC, Uruguay. Retrieved 10-08-2011
- ^ Tancredi, G. (2010). "Physical and dynamical characteristics of icy “dwarf planets” (plutoids)". Icy Bodies of the Solar System: Proceedings IAU Symposium No. 263, 2009. http://journals.cambridge.org/article_S1743921310001717.
- ^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. http://www.gps.caltech.edu/~mbrown/dps.html. Retrieved 2011-08-25.
- ^ Mike Brown. "The Dwarf Planets". http://web.gps.caltech.edu/~mbrown/dwarfplanets/. Retrieved 2008-01-20.
- ^ D. Ragozzine; M. E. Brown (2007). "Candidate Members and Age Estimate of the Family of Kuiper Belt Object 2003 EL61". The Astronomical Journal 134 (6): 2160–2167. arXiv:0709.0328. Bibcode 2007AJ....134.2160R. doi:10.1086/522334. http://www.iop.org/EJ/article/1538-3881/134/6/2160/205894.html. Retrieved 2009-12-05.
- Cruikshank, D., et al. High Albedo KBO (55565)2002 AW197, The Astronomical Journal Letters, 624,53 (May 2004). Abstract
- Doressoundiram, A.; Barucci, M. A.; Tozzi, G. P.; Poulet, F.; Boehnhardt, H.; de Bergh, C.; Peixinho, N. Spectral characteristics and modeling of the trans-neptunian object (55565) 2002 AW197 and the Centaurs (55576) 2002 GB10 and (83982) 2002 GO9: ESO Large Program on TNOs and Centaurs. Planetary and Space Science, 53, Issue 14-15, p. 1501–1509 (2005). Abstract
[edit] External links
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Wikimedia Commons has media related to: (55565) 2002 AW197 |
- AstDys orbital elements
- Orbital simulation from JPL (Java) / Horizons Ephemeris
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