New Astronomical Reduction of Old Observations (the NAROO project)

Arlot, Jean-Eudes; Robert, Vincent; Lainey, V.; Neiner, C.; Thouvenin, Nicolas

doi:10.1017/s1743921317005853

Cited by 5 publications

(3 citation statements)

References 1 publication

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“…The time period of this ephemeris representation is 1847/01/00.5 to 2145/01/02.0. The dynamical model is numerical integration (Lainey 2008;Arlot et al 2017). The time interval of the ephemerides was 1 minute.…”

Section: Image Processing Astrometric Reduction and Resultsmentioning

confidence: 99%

Observations of Five Major Uranian Satellites during 2013–2020 Based on Gaia DR3

Zhang,

Yu,

Qiao

et al. 2024

ApJS

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A total of 10,339 positions of the five major Uranian satellites (Ariel, Umbriel, Titania, Oberon and Miranda) were collected at the Yunnan Observatories from 2013 to 2020 with the 1.0 m astrometric reflector. A median filtering method was applied to reduce the influence of the bright Uranus halo. All CCD observational data was analyzed by the newly developed CCD image-processing software with Gaia DR3 as the reference catalog. The impact of different exposure times on satellite positioning accuracy was evaluated. The observational positions of satellites were compared with theoretical positions from Institut de Mécanique Céleste et de Calcul des Éphémérides (DE441 and Lainey et al. 2015) and the mean offsets are from −0.″115 to 0.″103 in both R.A. and decl. for the five satellites. The standard deviation of the offsets are from 0.″008 to 0.″086 for the four greatest Uranian satellites and from 0.″037 to 0.″132 for Miranda in each direction. These precise observations of the five major Uranian satellites over an 8 yr period will be very useful for improving the orbital parameters of both Uranus and its five major satellites.

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Section: Image Processing Astrometric Reduction and Resultsmentioning

confidence: 99%

Observations of Five Major Uranian Satellites during 2013–2020 Based on Gaia DR3

Zhang,

Yu,

Qiao

et al. 2024

ApJS

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“…With this catalogue, future and also past observations could be reduced with very high precision (a few tens of mas). If we reduce a few current The reduction of old photographic plates of solar system objects in the context of the Gaia mission is the topic of the NAROO 8 project (Arlot 2013). This project investigates natural satellites and asteroids (Transneptunian objects, NEA, or Main Belt asteroids) in order to refine the dynamics of these objects.…”

Section: Discussionmentioning

confidence: 99%

Detection of Yarkovsky acceleration in the context of precovery observations and the futureGaiacatalogue

Desmars

2015

A&A

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Context. The Yarkovsky effect is a weak non-gravitational force leading to a small variation of the semi-major axis of an asteroid. Using radar measurements and astrometric observations, it is possible to measure a drift in semi-major axis through orbit determination. Aims. This paper aims to detect a reliable drift in semi-major axis of near-Earth asteroids (NEAs) from ground-based observations and to investigate the impact of precovery observations and the future Gaia catalogue in the detection of a secular drift in semi-major axis. Methods. We have developed a precise dynamical model of an asteroid's motion taking the Yarkovsky acceleration into account and allowing the fitting of the drift in semi-major axis. Using statistical methods, we investigate the quality and the robustness of the detection. Results. By filtering spurious detections with an estimated maximum drift depending on the asteroid's size, we found 46 NEAs with a reliable drift in semi-major axis in good agreement with the previous studies. The measure of the drift leads to a better orbit determination and constrains some physical parameters of these objects. Our results are in good agreement with the 1/D dependence of the drift and with the expected ratio of prograde and retrograde NEAs. We show that the uncertainty of the drift mainly depends on the length of orbital arc and in this way we highlight the importance of the precovery observations and data mining in the detection of consistent drift. Finally, we discuss the impact of Gaia catalogue in the determination of drift in semi-major axis.

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“…This paper represents part of this Chinese project. A similar project, named the New Astrometric Reduction of Old Observations (NAROO), was launched at the French Institut de Mécanique Céleste et des Ephémérides (IMCCE) by Arlot (2013).…”

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confidence: 99%

Digitization and reduction of old astronomical plates of natural satellites

Duan

Qiao

Dourneau

et al. 2016

Mon. Not. R. Astron. Soc.

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Old astrophotographic plates are precious sources of historical data for astronomical studies, especially regarding the improvement of natural satellite orbits. Today, with the advent of new, accurate techniques, these old data can be re-processed so as to give positions that are much more accurate than those initially obtained. Various recent projects, including our Chinese project, have involved measuring and reducing these old plates again. Here we present a method for measurement and reduction that involves the digitization of plates using an advanced commercial scanner, namely the EPSON 10000 XL. We selected a set of 27 plates of the satellites of Jupiter, Saturn and Uranus taken from 1987 to 1990. A total of 125 satellite positions were derived from the new measurement and reduction of these plates using the UCAC4 catalogue. A comparison of the new observed positions with recent ephemerides has shown a general consistency with satellite theory of about 100 mas. The new positions present an accuracy equivalent to the most recent CCD observations, and better than the original positions. Moreover, nearly 30 per cent of the 125 positions obtained in this work are published for the first time here. This paper is a preliminary contribution to the larger project of new measurements and reductions of all the old Chinese plates of natural satellites, which should allow further improvements in the knowledge of the orbits of these satellites.

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New Astronomical Reduction of Old Observations (the NAROO project)

Cited by 5 publications

References 1 publication

Observations of Five Major Uranian Satellites during 2013–2020 Based on Gaia DR3

Observations of Five Major Uranian Satellites during 2013–2020 Based on Gaia DR3

Detection of Yarkovsky acceleration in the context of precovery observations and the futureGaiacatalogue

Digitization and reduction of old astronomical plates of natural satellites

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