CCD astrometric observations of 2017 VR12, Camillo and Midas

Zhang, Zhenjun; Zhang, Yi-Gong; Chen, Xiangming; Wang, Jiancheng; Su, Jie

doi:10.1088/1674-4527/19/5/71

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…Considerable scholarly attention has been allocated to the study of Potentially Hazardous Asteroids (PHAs). These research efforts are dedicated to conducting astrometric observations of NEOs including PHAs to obtain high-precision epoch positions (Wang et al 2014;Zhang et al 2015;Perna et al 2016;Zhang et al 2019). This paper focuses on the astrometric study of 1998 HH49, a PHA discovered on 1998 April 20, by the Lincoln Near-Earth Asteroid Research (LINEAR) (Stokes et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Astrometric Observations of NEA 1998 HH49 Using the Daocheng 50 cm Telescope

Xu,

Cheng,

Zhang

et al. 2024

Res. Astron. Astrophys.

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This study details an astrometric observation campaign of the NearEarth Asteroid(NEA) 1998 HH49, conducted with the aim of reffning our understanding of its physical characteristics. Utilizing the 50cm telescope located at the Wumingshan Mountain in Daocheng, Sichuan, images were obtained over four nights, from October 19 to October 22, 2023. These observations were processedusing Astrometrica software, facilitating the precise determination of the asteroid’s position.The observational results were compared with the ephemerides from three distinct sources to verify accuracy: the Jet Propulsion Laboratory (JPL) Horizons System, the Institut de Mécanique Céleste et de Calcul des Éphémérides(IMCCE) Miriade, and the Near-Earth Objects Dynamic Site (NEODyS-2). When compared with the JPL ephemeris, it yielded a mean observed-minus-calculated (O-C) result of 0.07'' in the Right Ascension (RA) direction and -0.35'' in the Declination (Dec) direction. Furthermore, the comparison with the IMCCE ephemeris yielded the mean O-C results of 0.08'' in the RA direction and -0.06'' in the Dec direction. The comparison with the NEODyS-2 ephemeris yielded the mean O-C results of 0.08'' in RA and -0.49'' in Dec direction. The study's findings demonstrate a general consistency between the observed data and the ephemeris predictions, with minor discrepancies observed across the datasets. Notably, both the JPL and NEODyS-2 ephemeris show that the residuals in the Dec direction exceed those in the RA direction. The disparities may result from atmospheric differential color refraction, ephemeris discrepancies, observational errors, and other factors. Additionally, it's worth noting that further investigation is required due to the potential influence of additional factors. Overall, the Daocheng 50cm Telescope exhibits the ability to conduct high-precision positional measurements.

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Section: Introductionmentioning

confidence: 99%

Astrometric Observations of NEA 1998 HH49 Using the Daocheng 50 cm Telescope

Xu,

Cheng,

Zhang

et al. 2024

Res. Astron. Astrophys.

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“…Astrometric observations of small celestial bodies in the solar system are of great significance for the study of the Solar System Formation and Evolution (Gomes et al 2005;Minton & Malhotra 2010;DeMeo & Carry 2014), the development of ephemerides for Solar System Objects by follow-up observations (Thuillot et al 2011;Xi-Liang et al 2015;Zhang et al 2019) and deep-space exploration (Meurisse & Carpenter 2020;Buczkowski & Wyrick 2020). As a part of the solar system, the NEOs have attracted much attention because of their posing threats to the earth and human civilization (Bancelin et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Using the traditional long-exposure methods to observe fast-moving faint and small objects, such as fixed star tacking mode or moving object tracking mode (Ryan & Ryan 2008;Zhang et al 2019), we obtain the streaked images of targets that affect the accuracy of the astrometry. Many method are available to avoid streaks in a single image, such as the "shift-and-stack" technique for tracking Kuiper Belt objects (Tyson et al 1992;Bernstein et al 2004), and the synthetic zhyg@ynao.ac.cn jcwang@ynao.ac.cn tracking technique for searching NEOs (Shao et al 2014;Zhai et al 2014Zhai et al , 2018Zhai et al , 2020.…”

Section: Introductionmentioning

confidence: 99%

Astrometric observations of a near-Earth object using the image fusion technique

Zhang,

Wang,

et al. 2021

Preprint

Self Cite

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The precise astrometric observation of small near-Earth objects (NEOs) is an important observational research topic in the astrometric discipline, which greatly promotes multidisciplinary research, such as the origin and evolution of the solar system, the detection and early warning of small NEOs, and deepspace navigation. The characteristics of small NEOs, such as faintness and fast moving speed, restrict the accuracy and precision of their astrometric observations. In the paper, we present a method to improve the accurate and precise astrometric positions of NEOs based on image fusion technique. The noise analysis and astrometric test from the observed images of the open cluster M23 are given. Using the image fusion technique, we obtain the sets of superimposed images and original images containing reference stars and moving targets respectively. The final fused image set includes background stars with high signal-to-noise ratios and ideal NEO images simultaneously and avoids the saturation of background stars. Using the fused images, we can reduce the influence of telescope tracking and NEO ephemeris errors on astrometric observations, and our results indicate that the accuracy and precision of NEO Eros astrometry are improved obviously after we choose suitable image fuse mode.

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Astrometric Observations of a Near-Earth Object Using the Image Fusion Technique

Zhang

Wang

et al. 2021

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The precise astrometric observation of small near-Earth objects (NEOs) is an important observational research topic in the astrometric discipline, which greatly promotes multidisciplinary research, such as the origin and evolution of the solar system, the detection and early warning of small NEOs, and deep-space navigation. The characteristics of small NEOs, such as faintness and fast moving speed, restrict the accuracy and precision of their astrometric observations. In the paper, we present a method to improve the accurate and precise astrometric positions of NEOs based on image fusion technique. The noise analysis and astrometric test from the observed images of the open cluster M23 are given. Using the image fusion technique, we obtain the sets of superimposed images and original images containing reference stars and moving targets, respectively. The final fused image set includes background stars with high signal-to-noise ratios and ideal NEO images simultaneously and avoids the saturation of background stars. Using the fused images, we can reduce the influence of telescope tracking and NEO ephemeris errors on astrometric observations, and our results indicate that the accuracy and precision of NEO Eros astrometry are improved obviously after we choose suitable image fuse mode.

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CCD astrometric observations of 2017 VR12, Camillo and Midas

Cited by 3 publications

References 17 publications

Astrometric Observations of NEA 1998 HH49 Using the Daocheng 50 cm Telescope

Astrometric Observations of NEA 1998 HH49 Using the Daocheng 50 cm Telescope

Astrometric observations of a near-Earth object using the image fusion technique

Astrometric Observations of a Near-Earth Object Using the Image Fusion Technique

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