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Centaur Nessus Ephemeris: 1900-2050

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This work aims at constraining the size, shape, and geometric albedo of the dwarf planet candidate 2002 MS4 through the analysis of nine stellar occultation events. Note that, with the astrometry from Gaia, the uncertainties in predictions rest completely upon the accuracy of the ephemerides. The high quality of the DES images provided us with an accurate set of positions within the range of the observed magnitudes. In Figure 4 we show the detection efficiency as measured by the number of observed positions divided by the number of images for a given object.

One of these objects, 2014 UZ224, has already been studied in more detail from radiometric techniques by Gerdes et al. It is where we have to enter chaos and allow transformation to occur through the awakening of the quality of detachment that comes through compassionate self-enquiry – although the process may lead us down a self-destructive path until we become aware of it. Now, with the results from deep sky surveys and the Gaia space mission, a new exciting era is within reach as accurate predictions of stellar occultations by numerous distant small solar system bodies become available. In this way, these ephemerides should be sufficiently accurate for 1–2 yr after the most recent observations and constant updates must be provided. CE110001020, and the Brazilian Instituto Nacional de Ciência e Tecnologia (INCT) e-Universe (CNPq grant 465376/2014-2).To solve this, a fourth filter was applied to our data and affected mostly those sources whose ephemerides presented large uncertainties (extension and doubtful sources; see Section 4. We highlight novelties developed by us and never reported before in the literature, which significantly enhance astrometry precision and automation. Our detection efficiency is around 90% to r < 22 and we detect objects as faint as r ∼ 24, more than one magnitude fainter than the average limiting magnitude in the same band.

Large facilities, such as Gemini North and the Canada-France-Hawaii Telescope (CFHT), were used to obtain high acquisition rates and signal-to-noise ratios. Assuming an equivalent radius of R equiv = 105 −7 ⁺⁶ km, we obtained a semi-major axis of a = 126 ± 22 km.The American Ephemeris 1950-2050 at Midnight, The Trans-Century Edition, is published in response to multiple requests for a one hundred year ephemeris covering these "most useful years.

The Dark Energy Survey (DES; Flaugher 2005) observations offer a considerable contribution to the study of small bodies in the solar system (see Dark Energy Survey Collaboration et al. Although stellar occultations are transient events and are still poorly predicted for most TNOs and Centaurs, it is the only ground-based technique from which sizes and shapes can be obtained with kilometer accuracies. A bit slow; helps in identifying asteroids that may be important for a particular chart, which you can then specify as Additional Objects. Previous studies about predictions of occultations tried to overcome the problem of ephemeris divergence by using more recent observations. We investigate the detectability of material previously observed in its vicinity using the 2018 occultation data obtained from South Africa Astronomical Observatory (SAAO).As a result from this process, misidentifications of TNOs and Centaurs from the images were reduced to a minimum, although real outliers can still be found mostly among the doubtful sources. Aims: This paper presents an alternative method of prediction, based on a new accurate orbit determination procedure, which uses all the available positions of the TNO from the Minor Planet Center database, as well as sets of new astrometric positions from unpublished observations.

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