NAROO program: Analysis of USNO Galilean observations 1967–1998

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2024-10-22 DOI:10.1016/j.icarus.2024.116344

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Abstract

The New Astrometric Reduction of Old Observations (NAROO) program is dedicated to the measurement of astrophotographic plates and the analysis of old observations for scientific purposes. One of the main objectives of the NAROO program is to provide accurate positional measurements of planets and satellites to improve our knowledge of their orbits and dynamics, and to infer the accuracy of the planet and satellite ephemerides. We digitized 553 astronegatives of the Galilean satellites taken with the McCormick 26-inch refractor in 1967/68 and the U.S. Naval Observatory 26-inch refractor from 1973 to 1998, resulting in 2650 individual observations. We measured and reduced these observations through an optimal process that includes image, instrumental, and spherical corrections using Gaia-DR3 catalog to provide the most accurate equatorial (RA, Dec) ICRS (Gaia-CRF3) positions. 4819 positions of the Galilean satellites have been determined with an accuracy of 55 mas (160 km at Jupiter), near the limit of the photographic technique for such work. These data can help to improve the equatorial positions of Jupiter. They also can be used in the context of quantifying tidal effects and will still be useful when Europa Clipper and Juice data will become available.

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NAROO 计划：美国国家空间研究组织（USNO）1967-1998 年伽利略观测数据分析

新天体测量旧观测数据还原（NAROO）计划致力于为科学目的测量天体摄影板和分析旧观测数据。NAROO 计划的主要目标之一是提供行星和卫星的精确位置测量数据，以增进我们对其轨道和动力学的了解，并推断行星和卫星星历表的准确性。我们对 1967/68 年用麦考密克 26 英寸折射镜和 1973 年至 1998 年用美国海军天文台 26 英寸折射镜拍摄的 553 幅伽利略卫星天文照片进行了数字化处理，得到了 2650 个单独的观测数据。我们利用 Gaia-DR3 星表对这些观测数据进行了测量和缩减，其中包括图像、仪器和球面校正，以提供最精确的赤道（RA，Dec）ICRS（Gaia-CRF3）位置。伽利略卫星的 4819 个位置已经确定，精度为 55mas（木星 160 公里），接近此类工作的摄影技术极限。这些数据有助于改进木星的赤道位置。这些数据还可用于对潮汐效应进行量化，在获得 Europa Clipper 和 Juice 数据后仍将有用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.