Precise CCD positions of Phoebe in 2011–2014

Peng, Qiwei; Wang, N.; Vienne, A.; Zhang, Qingfeng; Li, Z.; Xue, Meng

doi:10.1093/mnras/stv469

Cited by 14 publications

(14 citation statements)

References 14 publications

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“…The solution has been successfully applied for the astrometry of HST and several ground-based telescopes (Anderson et al 2006;Libralato et al 2014). For photographic astrometry, we proposed an alternative GD solution, taking an astrometric catalog as reference (Peng et al 2012) and the solution is also successfully applied for the astrometry of some natural satellites (Peng et al 2015(Peng et al , 2017Wang et al 2017). However, if derived from the same observations, are the two GD solutions in agreement with each other?…”

Section: Introductionmentioning

confidence: 99%

Using Gaia DR2 to make a systematic comparison between two geometric distortion solutions

Zheng

Peng

Lin

2021

Monthly Notices of the Royal Astronomical Society

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Gaia Data Release 2 (Gaia DR2) provides high accuracy and precision astrometric parameters (position, parallax, and proper motion) for more than 1 billion sources and is revolutionising astrometry. For a fast-moving target such as an asteroid, with many stars in the field of view that are brighter than the faint limit magnitude of Gaia (21 Gmag), its measurement accuracy and precision can be greatly improved by taking advantage of Gaia reference stars. However, if we want to study the relative motions of cluster members, we could cross-match them in different epochs based on pixel positions. For both types of targets, the determination of optical field-angle distortion or called geometric distortion (GD) in this paper is important for image calibration especially when there are few reference stars to build a high-order plate model. For the former, the GD solution can be derived based on the astrometric catalog’s position, while for the latter, a reference system called ‘master frame’ is constructed from these observations in pixel coordinates, and then the GD solution is derived. But are the two GD solutions in agreement with each other? In this paper, two types of GD solutions, which are derived either from the Gaia DR2 catalog or from the self-constructed master frame, are applied respectively for the observations taken by 1-m telescope at Yunnan Observatory. It is found that two GD solutions enable the precision to achieve a comparable level (∼10 mas) but their GD patterns are different. Synthetic distorted positions are generated for further investigation into the discrepancy between the two GD solutions. We aim to find the correlation and distinction between the two types of GD solutions, and their applicability in high precision astrometry.

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Section: Introductionmentioning

confidence: 99%

Using Gaia DR2 to make a systematic comparison between two geometric distortion solutions

Zheng

Peng

Lin

2021

Monthly Notices of the Royal Astronomical Society

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“…We also updated the ephemeris of Phoebe ) using the observations of GJ15, Peng et al (2015), observations from MPC and from Flagstaff. A total of 5886 observations between 1989 and 2014 were used in the process.…”

Section: Discussionmentioning

confidence: 99%

“…2). For Phoebe, we updated the ephemeris of using the observations of GJ15, Peng et al (2015), observations from Minor Planet Center and observations from Flagstaff.…”

Section: Introductionmentioning

confidence: 99%

New orbits of irregular satellites designed for the predictions of stellar occultations up to 2020, based on thousands of new observations

Gomes-Júnior

Assafin

Desmars

et al. 2016

Mon. Not. R. Astron. Soc.

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Gomes -Júnior et al. (2015) published 3613 positions for the 8 largest irregular satellites of Jupiter and 1787 positions for the largest irregular satellite of Saturn, Phoebe. These observations were made between 1995 and 2014 and have an estimated error of about 60 to 80 mas. Based on this set of positions, we derived new orbits for the eight largest irregular satellites of Jupiter: Himalia, Elara, Pasiphae, Carme, Lysithea, Sinope, Ananke and Leda. For Phoebe we updated the ephemeris from Desmars et al. (2013) using 75% more positions than the previous one. Due to their orbital characteristics, it is common belief that the irregular satellites were captured by the giant planets in the early Solar System, but there is no consensus for a single model explaining where they were formed. Size, shape, albedo and composition would help to trace back their true origin, but these physical parameters are yet poorly known for irregular satellites. The observation of stellar occultations would allow for the determination of such parameters. Indeed Jupiter will cross the galactic plane in 2019-2020 and Saturn in 2018, improving a lot the chances of observing such events in the near future. Using the derived ephemerides and the UCAC4 catalogue we managed to identify 5442 candidate stellar occultations between January 2016 and December 2020 for the 9 satellites studied here. We discussed how the successful observation of a stellar occultation by these objects is possible and present some potential occultations.

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“…This method was applied to CCD images from the 1-m and 2.4-m telescope at Yunnan Observatory for open clusters (Peng et al 2012), the saturnian satellite Phoebe (Peng et al 2015), and the near-Earth asteroid Apophis (Wang et al 2015), improving the positional accuracy by about a factor of 2.…”

Section: Solar Systemmentioning

confidence: 99%

Division a Commission 8: Astrometry

Zacharias¹,

Evans²,

Chen³

et al. 2015

Proc. IAU

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Commission 8 has regularly published triennial reports in the past and the current OC therefore voted to adopt a traditional format also for this special Legacy issue of the IAU Transactions. The outgoing President is grateful for the support of many Commission members who contributed to this report. Our contribution consists of 3 parts: 1) this introduction, providing a general overview and highlights of recent research in astrometry, 2) a summary of the astrometry business & science meeting at the 2015 IAU General Assembly, and 3) the activity report of our Commisson covering the mid-2012 to mid-2015 period.

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Precise CCD positions of Phoebe in 2011–2014

Cited by 14 publications

References 14 publications

Using Gaia DR2 to make a systematic comparison between two geometric distortion solutions

Using Gaia DR2 to make a systematic comparison between two geometric distortion solutions

New orbits of irregular satellites designed for the predictions of stellar occultations up to 2020, based on thousands of new observations

Division a Commission 8: Astrometry

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