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| 2003 EL61 | |
|---|---|
| Name | 2003 EL61 |
| Discovery date | 2004 |
| Discoverer | Mike Brown, David Rabinowitz, Chad Trujillo et al. |
2003 EL61 is a large trans-Neptunian object discovered in 2004 by a team including Mike Brown, Chad Trujillo, and David L. Rabinowitz. It resides in the Kuiper belt and is notable for its rapid rotation, elongated shape, high density, and a system of satellites, all of which have made it a focus of studies by researchers associated with institutions such as the California Institute of Technology, Harvard–Smithsonian Center for Astrophysics, and the Space Telescope Science Institute. Observations from facilities including the Keck Observatory, Keck II, Hubble Space Telescope, and the Subaru Telescope contributed to its characterization.
The object was first identified during the wide-field surveys conducted by teams from California Institute of Technology and the Jet Propulsion Laboratory using instruments at the Palomar Observatory and Kitt Peak National Observatory. Announcements were published in minor-planet circulars that follow conventions set by the Minor Planet Center and procedures administered by the International Astronomical Union. Subsequent follow-up astrometry used archives maintained by the Sloan Digital Sky Survey and imaging from the Hubble Space Telescope. The provisional designation followed the nomenclature system overseen by the Minor Planet Center before it received a name honoring themes chosen via the International Astronomical Union process.
Its orbit lies in the classical population of the Kuiper belt and shares dynamical context with resonant populations that include objects like Pluto, Haumea, and Makemake. Orbital elements were refined through observations coordinated with the Minor Planet Center, using ephemerides from the Jet Propulsion Laboratory and integrations in N-body codes similar to those developed at the Harvard–Smithsonian Center for Astrophysics. Its semimajor axis, eccentricity, and inclination place it among the high-inclination, moderate-eccentricity trans-Neptunian objects, which are often compared to populations studied in surveys by teams at European Southern Observatory, Gemini Observatory, and the Very Large Telescope. Long-term dynamical studies reference methods from the N-body problem community and techniques applied in studies of the Scattered disc and classical Kuiper belt.
Photometry from the Keck Observatory, Hubble Space Telescope, and ground-based observatories such as Mauna Kea and Cerro Tololo Inter-American Observatory established an absolute magnitude and allowed estimates of size and albedo via thermal observations from instruments like those on the Spitzer Space Telescope and facilities affiliated with the Infrared Astronomical Satellite. Stellar occultations coordinated with networks that include the International Occultation Timing Association refined its shape dimensions. Mass estimates derive from orbital parameters of its satellites measured with techniques pioneered by observers at Space Telescope Science Institute and analyzed by researchers at the Max Planck Institute for Solar System Research. Its mean density, obtained from mass and volume comparisons, indicates a significant fraction of rocky material, an inference that ties into formation models developed at institutions like the University of California, Berkeley and the Southwest Research Institute.
Spectroscopy from the Keck Observatory, Gemini Observatory, and the Subaru Telescope revealed surfaces dominated by crystalline and amorphous water ice features similar to those seen on Triton and Enceladus. Laboratory spectra produced at facilities such as the Jet Propulsion Laboratory and the Planetary Science Institute provided opacity databases used to interpret bands associated with methane and possible silicate absorptions analogous to materials studied in meteorite collections at the Smithsonian Institution. Comparisons to the spectral suite of Haumea and surface processing mechanisms investigated at groups in NASA Ames Research Center and Los Alamos National Laboratory suggest a collisional history and resurfacing processes akin to those invoked for other icy outer Solar System bodies observed by teams at the European Space Agency and the Rosetta mission science community.
High-cadence photometric campaigns using telescopes from the Las Cumbres Observatory Global Telescope Network and timing analysis methods refined by groups at the University of Arizona determined an exceptionally rapid rotation period and a large lightcurve amplitude. Shape modeling techniques employed by researchers at the Institut d'Astrophysique de Paris and the Max Planck Institute for Solar System Research indicate a triaxial ellipsoid consistent with figures of equilibrium studied in classical works by Isaac Newton and modern formulations used by computational groups at the University of Cambridge and California Institute of Technology. Comparisons are often drawn to rotationally distorted minor planets characterized in surveys by the Pan-STARRS team and follow-up observers from the European Southern Observatory.
The primary object hosts a system of satellites discovered in images from the Hubble Space Telescope and the Keck Observatory, whose orbits provided direct constraints on the primary's mass. Analyses of satellite dynamics used techniques from the Celestial mechanics community, including work by scholars affiliated with Princeton University and the Massachusetts Institute of Technology. Searches for circumprimary material reference methodologies from investigations of rings at Chariklo, Haumea and planetary rings studied by teams involved with the Cassini–Huygens mission and researchers at the Jet Propulsion Laboratory.
Collisional formation scenarios draw on impact modeling efforts conducted at the Southwest Research Institute, NASA Ames Research Center, and the University of Bern, relating to giant-impact hypotheses developed to explain bodies such as Pluto and Charon. N-body and hydrodynamical simulations from groups at the California Institute of Technology, Massachusetts Institute of Technology, and the Max Planck Institute for Solar System Research explore pathways that produce rapid rotation, satellites, and family members akin to those recognized in surveys by the Sloan Digital Sky Survey and Pan-STARRS. Long-term dynamical evolution studies reference the influence of planetary migration paradigms such as the Nice model and resonance sweeping proposed by researchers at the Observatoire de la Côte d’Azur and Institut de Planétologie et d'Astrophysique de Grenoble.