Centaur Nessus Ephemeris: 1900-2050

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In this context, we have to consider the covariance matrix of the observed position V obs that is supposed to be known in the LSM. This filter has as an input the offsets that remained from the application of the previous filters and works as follows. and the construction of an empirical model that takes into consideration effects due to the atmosphere and the instrument.

In the same way, blue dots are the differences between the observed positions and those from JPL ephemeris.This inevitably leads to a correspondingly crude characterization of the orbital uncertainty and in many cases to less accurate orbits. First, a mean ( m 0) and a standard deviation ( s 0) are obtained from a sigma-clipping iterative process, where σ is a low value (1. For this purpose, we performed about 2900 new observations in several observatories (European South Observatory, Observatório Pico dos Dias, Pic du Midi, etc.

Until now, the most used method of prediction, involving dozens of TNOs/Centaurs, has been to consider a constant offset for the right ascension and for the declination with respect to a reference ephemeris, usually the latest public version. Focused on potentially hazardous asteroids (PHAs), which are near-Earth asteroids (NEAs) making very close encounters with the Earth, this paper aims to emphasize the value of old photographic plate observations.

This linear relation can thus provide the estimated precision of the position in the celestial sphere (right ascension and declination) at any date. In this way, it is expected that a box of this size centered on the ephemeris (calculated) position of an object in Table 6 contains the respective observed position and a field star. As far as the study of these objects through the stellar occultation technique is concerned, it is clear that the combination of large sky surveys and the astrometry from the Gaia space mission (Gaia Collaboration et al.