NEODyS

NEODyS (en anglés: Near Earth Objects Dynamic Site) és un servici que oferix informació sobre objectes pròxims a la Terra en un cómodo interfaç basat en la web. Es basa en una contínua i, casi automàticament mantinguda, base de senyes sobre les òrbites dels asteroides propencs a la Terra. Este lloc oferix una série de servicis a la comunitat NEO. El principal servici és un sistema de monitoreo d'impacte (CLOMON2) de tots els asteroides propencs a la Terra que cobrix un periodo que va fins a l'any 2100.

Servicis

• Risk Page: The most important service is the production of a Risk Page where all NEVos with probabilities of hitting the Earth greater of 10⁻¹¹ from now until 2100 llaure shown in a Risk list. In the table of the Risk list the NEVos llaure divided into "Special", as it is the case of (99942) Apophis; "Observable", objects which llaure presently observable and which critically need a follow up in order to improve their orbit; "Possible recovery", objects which llaure not visible at present, but which llaure possible to recover in the next future; "Lost", objects which have an absolute magnitude (H) brighter than 25 but which llaure virtually lost, being their orbit too uncertain; and "Small", objects with an absolute magnitude fainter than 25 and, even if they llaure "lost", they llaure considered too small to result in heavy damage on the ground. Each object has its own Impactor Table (IT) which shows many parameters useful to determine the risk assessment.
• Ephemerides: It provides ephemerides of the object, that is position on sky, V magnitude, altitude, airmass, solar and llunar elongation, phase angle, galactic coordinates, R distance to the Sun, delta distance to the Earth, motion on sky, and the uncertainty on sky.
• Observation prediction: It provides the position of the object at a specific clave, information useful for the observer and a graph showing the uncertainty on sky.
• Orbital Information: It provides the dynamical parameters of the orbit of the object.
• MOID: It shows the analysis of the Minimum Orbital Intersection Distance (MOID) of the object.
• Proper elements: It shows the secular properties of the object.
• Observational Information: It provides data of both optical and radar observations and their statistical performance.
• Close approaches: It provides a table with all the close approaches until 2100 with the planets of the Solar System.
• Search: It provides the possibility of queries in the database according to the orbital parameters or the observational conditions or the close approaches with the planets of the Solar System.
• Observatories: It is possible to access the information regarding observatories and their performances.
• Other services: Physical Information provided by the European Asteroid Research Node (E.A.R.N.); Orbit animation provided by the NEO Program Office at the Jet Propulsion Laboratory

Com treballa NEODyS

NEODyS is based on a Postgresql database running on a Linux system.

The database of orbits is continually and automatically maintained with the most recent Minor Planet Center observations. The orbits llaure computed with the OrbFit software package provided by the OrbFit Consortium. All of the computational services provided by this site ca also be done with this software package.