Astrometry and Occultation Predictions to Trans-Neptunian and Centaur Objects Observed within the Dark Energy Survey
Transneptunian objects (TNOs) are a source of invaluable information to access the history and evolution of the outer solar system. However, observing these faint objects is a difficult task. As a consequence, important properties such as size and albedo are known for only a small fraction of them. Now, with the results from deep sky surveys and the Gaia space mission, a new exciting era is within reach as accurate predictions of stellar occultations by numerous distant small solar system bodies become available. From them, diameters with kilometer accuracies can be determined. Albedos, in turn, can be obtained from diameters and absolute magnitudes. We use observations from the Dark Energy Survey (DES) from November 2012 until February 2016, amounting to 4292847 CCD frames. We searched them for all known small solar system bodies and recovered a total of 202 TNOs and Centaurs, 63 of which have been discovered by the DES collaboration until the date of this writing. Their positions were determined using the Gaia Data Release 2 as reference and their orbits were refined. Stellar occultations were then predicted using these refined orbits plus stellar positions from Gaia. These predictions are maintained, and updated, in a dedicated web service. The techniques developed here are also part of an ambitious preparation to use the data from the Large Synoptic Survey Telescope (LSST), that expects to obtain accurate positions and multifilter photometry for tens of thousands of TNOs.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- Contributing Organization:
- DES Collaboration
- Grant/Contract Number:
- AC02-07CH11359; SC0019193; AC02-76SF00515; AC05-00OR22725
- OSTI ID:
- 1508031
- Alternate ID(s):
- OSTI ID: 1502987; OSTI ID: 1503975; OSTI ID: 1728571
- Report Number(s):
- arXiv:1811.10724; FERMILAB-PUB-18-494; 1725803
- Journal Information:
- The Astronomical Journal (Online), Vol. 157, Issue 3; ISSN 1538-3881
- Publisher:
- IOP Publishing - AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
The Case for a Large-scale Occultation Network
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journal | June 2019 |
The Case for a Large-Scale Occultation Network
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text | January 2019 |
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