High-Precision Follow-Up Observations of Near-Earth Objects

Maigurova, N. V.; Pomazan, A.; Shulga, A. V.

doi:10.18524/1810-4215.2018.31.144562

Cited by 4 publications

(4 citation statements)

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“…It could be explained by fact that such objects usually have short observed orbital arc and not enough observations for reliable orbit determination. When the positions are added to IAU MPC database and taken into account for orbit recalculated new calculated (O -C) differences often show decreasing of absolute values (Maigurova at al., 2018). Considering newly discovered NEAs it could be noticed that they, obviously, have high values for uncertainty parameter (U) and it correlates with apparent rate of motion.…”

Section: Astrometric Resultsmentioning

confidence: 99%

Ongoing Follow-Up Nea Observations in Ukraine and China Using RDS CCD Technique

Pomazan

Maigurova

Shulga

et al. 2021

OAP

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The current state of near-Earth asteroids (NEAs) observations shows an annual increase in the number of newly discovered objects However, the frequency distribution of NEAs by size shows a sharp decrease in the number of objects with size less than 300 m, which contradicts the results of theoretical modeling of the NEA population. Considering definition of potentially hazardous asteroids (PHA), only objects with diameters more than 140 m could pose catastrophic consequences to the Earth and mankind in general. But in the same time, impacts of smaller size objects could lead to significant consequences on local level and their large predicted number increases this probability. Due to their small size which results in faint apparent magnitude, such NEAs are discovered in a short interval of their close approach (CA) to the Earth, when their apparent magnitude are tending to be as bright as possible for a given size. This is not only facilitates the detection of such new objects but also increases their observability by small ground-based telescopes. However, apparent rate of motion during this time might exceed 10 deg d −1 making the observations challenging. The used Rotating-drift-scan CCD (RDS CCD) technique allows to get images of fast-moving objects as a point, that in turn to determine the coordinates of their image centers with sufficient astrometric precision. Obtained in current research project positions show errors in the range ± (0.2″ − 0.3″) in both coordinates with comparison both to JPL's HORIZONS 1 system and NEODyS-2 2 service. The part of observations was obtained around time moment of minimal distance to the Earth during current CA for newly discovered NEAs. Such observations are important to extend observed orbital arc for reliable improvement of their orbit determinations and reducing orbital uncertainty, so it will be possible to recover them in next apparitions.

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Section: Astrometric Resultsmentioning

confidence: 99%

Ongoing Follow-Up Nea Observations in Ukraine and China Using RDS CCD Technique

Pomazan

Maigurova

Shulga

et al. 2021

OAP

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“…Numerous NEA observations using the RDS technique have already been made with the LiShan telescope (Pomazan et al 2021 from 2019 to 2023 and the Mykolaiv telescope (Maigurova et al 2018) from 2011 to 2022. The Mykolaiv telescope is a 0.5 m Maksutov telescope with a focal length of 3000 mm and an FWHM of 2 5.…”

Section: Statistical Analysis Of Rds Astrometrymentioning

confidence: 99%

“…By controlling the rotation angle of the camera and the CCD charge transfer speed according to the apparent motion of the target NEA, point-like images of the fast-moving NEA can be acquired. The RDS technique has been used to observe hundreds of NEAs, as reported by Maigurova et al (2018), Pomazan et al (2021), and . In this article, we present a detailed overview of the RDS technique by observing a newly discovered NEA 2023 BJ 7 .…”

Section: Introductionmentioning

confidence: 99%

Error Analysis for Rotating-drift-scan Charge-coupled Device Observation of Near-Earth Asteroids

Tang,

Pomazan,

Maigurova

et al. 2024

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The apparent velocities of near-Earth asteroids (NEAs) are usually high when they pass by Earth. Observing these fast-moving objects with long exposure times would cause their images to streak and significantly decrease the precision of astronomical measurements. The rotating-drift-scan (RDS) charge-coupled device technique is a promising approach to observe fast-moving NEAs during their close approaches to Earth. By rotating the camera of a telescope, an NEA can be observed in the time delay integration mode. This allows the asteroid to be imaged as a point source, even with a long exposure time. Here, we thoroughly present the RDS follow-up observation and orbit determination of a newly discovered NEA 2023 BJ7. This technique makes an impactful contribution to improving the NEA's orbit accuracy by extending the observation arc. A detailed statistical analysis of the astrometric error was conducted, revealing that RDS observations can achieve a competitive accuracy with an rms error of 0.″24 in right ascension and 0.″32 in declination. The instability of the telescope is thought to be the main reason affecting the internal precision. Furthermore, the RDS technique excels at observing fast-moving NEAs, as well as newly discovered NEAs without accurate ephemerides. For NEAs with rates of motion exceeding 10 deg day−1, the rms of RDS observation residuals is 0.″35 in the along-track direction and 0.″23 in the cross-track. With this technique, a network of small-aperture telescopes would substantially benefit our global NEAs monitoring system to ensure Earth’s safety from any asteroid impacts.

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“…Therefore, it is critically important to detect, identify and systematically monitor such objects to determine the orbital elements with precision sufficient to predict the probability of terrestrial impact as part of Space Situational Awareness. As described in Maigurova et al (2018), more than 40% of known PHAs were discovered after they had approached a minimum distance to the Earth.…”

Section: Introductionmentioning

confidence: 99%

The research objectives and observational possibilities for fast moving near-Earth asteroids

Pomazan

Tang

Maigurova

et al. 2021

Res. Astron. Astrophys.

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The paper describes observations of fast-moving near-Earth asteroids (NEAs) made with the small ground-based telescopes of National Time Service Center of Chinese Academy of Science (NTSC of CAS) and Research Institute “Mykolaiv Astronomical Observatory” (RI MAO) by the rotating-drift-scan CCD (RDS CCD) technique. This technique is used to obtain the point images of both the studied objects and reference stars. The results of ongoing follow-up observations of NEAs are discussed. The residual differences (O – C) between the observed and calculated positions from JPL ephemeris were generally small for these asteroids. The standard deviations of these differences were typically ±(0.2″ – 0.3″) in both coordinates for objects with apparent velocity which substantially exceed FWHM for the given exposure time. The results of comparative statistics for such observations from the MPC database show that this is a good level of precision for NEAs. Moreover, the telescopes with the RDS CCD technique implemented can observe the NEAs that closely approach the Earth and with enough observations can improve the precision of determining their orbital elements and impact predictions.

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High-Precision Follow-Up Observations of Near-Earth Objects

Cited by 4 publications

References 1 publication

Ongoing Follow-Up Nea Observations in Ukraine and China Using RDS CCD Technique

Ongoing Follow-Up Nea Observations in Ukraine and China Using RDS CCD Technique

Error Analysis for Rotating-drift-scan Charge-coupled Device Observation of Near-Earth Asteroids

The research objectives and observational possibilities for fast moving near-Earth asteroids

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