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"type" : "Publication",
"id" : "https://puma.ub.uni-stuttgart.de/bibtex/29a6086eb0b83688b27e3016b60b0f3e9/asteroidguy",
"tags" : [
"SOFIA","imported","myown"
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"interHash" : "8a31ef0ec16c1fb74451a1f85d2cc0d6",
"label" : "Stellar Occultations in the Era of Data Mining and Modern Regression Models: Using Gaussian Processes to Analyze Light Curves and Improve Predictions",
"user" : "asteroidguy",
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"date" : "2025-12-15 18:18:21",
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"pub-type": "article",
"journal": "The Planetary Science Journal",
"year": "2024",
"url": "https://doi.org/10.3847/PSJ/ad3819",
"author": [
"Bastian Knieling","Karsten Schindler","Amanda A. Sickafoose","Michael J. Person","Stephen E. Levine","Alfred Krabbe"
],
"authors": [
{"first" : "Bastian", "last" : "Knieling"},
{"first" : "Karsten", "last" : "Schindler"},
{"first" : "Amanda A.", "last" : "Sickafoose"},
{"first" : "Michael J.", "last" : "Person"},
{"first" : "Stephen E.", "last" : "Levine"},
{"first" : "Alfred", "last" : "Krabbe"}
],
"doi" : "10.3847/PSJ/ad3819",
"bibtexKey": "knieling2024stellar"
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"type" : "Publication",
"id" : "https://puma.ub.uni-stuttgart.de/bibtex/29fff435aa622990a61210bdaa831be64/asteroidguy",
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"ATUS","astronomy","imported","myown"
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"intraHash" : "9fff435aa622990a61210bdaa831be64",
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"label" : "Stellar Occultations by Bodies in the Outer Solar System",
"user" : "asteroidguy",
"description" : "",
"date" : "2025-12-15 18:18:21",
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"journal": "IAU General Assembly",
"year": "2024",
"url": "",
"author": [
"Amanda Sickafoose","Elisabeth Adams","Bastian Knieling","Stephen Levine","Michael Person","Karsten Schindler","Carlos Zuluaga"
],
"authors": [
{"first" : "Amanda", "last" : "Sickafoose"},
{"first" : "Elisabeth", "last" : "Adams"},
{"first" : "Bastian", "last" : "Knieling"},
{"first" : "Stephen", "last" : "Levine"},
{"first" : "Michael", "last" : "Person"},
{"first" : "Karsten", "last" : "Schindler"},
{"first" : "Carlos", "last" : "Zuluaga"}
],
"abstract": "Stellar occultations are one of the most accurate, ground-based methods by which to assess physical characteristics of bodies in the outer Solar System. For example, in the trans-Neptunian region, occultation data have been used to determine object sizes and shapes at km-level accuracy, detect or place limits on microbar-level atmospheres, and discover and study rings down to km-level widths. Particularly compelling targets over the next few years include Pluto (which its thin, evolving, global atmosphere) and the trans-Neptunian objects and Centaurs for which rings have been proposed (Chariklo, Chiron, Haumea, and Quaoar). We will present recent results from stellar occultations by bodies in the outer Solar System, and we will consider the implications of large discovery surveys on future occultation efforts as well as how the technique can be used to increase their science return....",
"bibcode" : "2024IAUGA..32P.999S",
"bibtexKey": "sickafoose2024stellar"
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"type" : "Publication",
"id" : "https://puma.ub.uni-stuttgart.de/bibtex/2865ef5b00fbdd3c82c9750ce6653a805/asteroidguy",
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"ATUS","SOFIA","astronomy","imported","myown"
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"label" : "Results from a stellar occultation by KBO Varda",
"user" : "asteroidguy",
"description" : "",
"date" : "2025-12-15 18:18:21",
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"pub-type": "misc",
"journal": "AGU Fall Meeting Abstracts",
"year": "2019",
"url": "",
"author": [
"K. Schindler","A. S. Bosh","S. E. Levine","M. J. Person","J. Wolf","C. Zuluaga","A. Krabbe"
],
"authors": [
{"first" : "K.", "last" : "Schindler"},
{"first" : "A. S.", "last" : "Bosh"},
{"first" : "S. E.", "last" : "Levine"},
{"first" : "M. J.", "last" : "Person"},
{"first" : "J.", "last" : "Wolf"},
{"first" : "C.", "last" : "Zuluaga"},
{"first" : "A.", "last" : "Krabbe"}
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"abstract": "We present results obtained from a stellar occultation by the classical Kuiper belt object (174567) Varda on 10 September 2018. Varda is a known binary system and among the largest TNOs known today, but has not been studied during an occultation before. Among our collaborators, 24 stations were able to acquire data at the time of the event, of which 15 obtained a clear detection, making this the best-sampled occultation of a TNO to date. As potential stellar duplicity could cause a significant shift of the ground path, we studied the target star in advance through speckle imaging with 'Alopeke at Gemini North. The reconstructed shape is an ellipsoid, which supports Varda's status as a dwarf planet candidate. Albeit slightly smaller, the calculated size is in agreement with the radiometric diameter based on Herschel/PACS FIR measurements. Post-event analysis of the dataset obtained at DCT revealed a faint, unresolved companion or background star very close to the target, which was well under the detection limit of our speckle imager data, but had practically no effect on the predicted path. No atmosphere has been detected. The occultation helped to constrain size and albedo, which in turn helps to better constrain Varda's density....",
"bibcode" : "2019AGUFM.P42C..08S",
"bibtexKey": "schindler2019results"
}
,
{
"type" : "Publication",
"id" : "https://puma.ub.uni-stuttgart.de/bibtex/206024ecc3d7d05c2b9855e8e28774edd/asteroidguy",
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"astronomy","imported","myown"
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"intraHash" : "06024ecc3d7d05c2b9855e8e28774edd",
"interHash" : "75eaaa6ca830947c2c20bbaab9ee34dd",
"label" : "Composition of Jupiter irregular satellites sheds light on their origin",
"user" : "asteroidguy",
"description" : "",
"date" : "2025-12-15 18:18:21",
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"pub-type": "article",
"journal": "Astronomy and Astrophysics",
"year": "2017",
"url": "https://ui.adsabs.harvard.edu/#abs/2017arXiv171006200B",
"author": [
"M. Bhatt","V. Reddy","K. Schindler","E. Cloutis","A. Bhardwaj","L. L. Corre","P. Mann"
],
"authors": [
{"first" : "M.", "last" : "Bhatt"},
{"first" : "V.", "last" : "Reddy"},
{"first" : "K.", "last" : "Schindler"},
{"first" : "E.", "last" : "Cloutis"},
{"first" : "A.", "last" : "Bhardwaj"},
{"first" : "L. L.", "last" : "Corre"},
{"first" : "P.", "last" : "Mann"}
],
"abstract": "Context. Irregular satellites of Jupiter with their highly eccentric, inclined and distant orbits suggest that their capture took place after the giant planet migration.
Aims: We aim to improve our understanding of the surface composition of irregular satellites of Jupiter to gain insight into a narrow time window when our solar system was forming.
Methods: We observed three Jovian irregular satellites, Himalia (JVI), Elara (JVII), and Carme (JXI), using a medium-resolution 0.8-5.5 μm spectrograph, SpeX on the NASA Infrared Telescope Facility (IRTF). Using a linear spectral unmixing model we have constrained the major mineral phases on the surface of these three bodies.
Results: Our results confirm that the surface of Himalia (JVI), Elara (JVII), and Carme (JXI) are dominated by opaque materials such as those seen in carbonaceous chondrite meteorites. Our spectral modeling of NIR spectra of Himalia and Elara confirm that their surface composition is the same and magnetite is the dominant mineral. A comparison of the spectral shape of Himalia with the two large main C-type asteroids, Themis (D 176 km) and Europa (D 352 km), suggests surface composition similar to Europa. The NIR spectrum of Carme exhibits blue slope up to 1.5 μm and is spectrally distinct from those of Himalia and Elara. Our model suggests that it is compositionally similar to amorphous carbon.
Conclusions: Himalia and Elara are compositionally similar but differ significantly from Carme. These results support the hypotheses that the Jupiter's irregular satellites are captured bodies that were subject to further breakup events and clustered as families based on their similar physical and surface compositions.",
"bibcode" : "2017A&A...608A..67B",
"doi" : "10.1051/0004-6361/201630361",
"bibtexKey": "bhatt2017composition"
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"id" : "https://puma.ub.uni-stuttgart.de/bibtex/2b2b74ebfcc907e679b8a47e9b04a1bbb/asteroidguy",
"tags" : [
"SDC","imported","myown"
],
"intraHash" : "b2b74ebfcc907e679b8a47e9b04a1bbb",
"interHash" : "a5a9eccdff62e36b3feb03130b0f4170",
"label" : "Helping Bridge the FIR-Data-Drought with the SOFIA Data Center (SDC)",
"user" : "asteroidguy",
"description" : "",
"date" : "2025-12-15 18:18:21",
"changeDate" : "2025-12-15 18:42:06",
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"pub-type": "misc",
"journal": "American Astronomical Society Meeting Abstracts",
"year": "2025",
"url": "",
"author": [
"Bernhard Schulz","Aaron Bryant","Christian Fischer","Nadine Fischer","Benjamin Greiner","Michael Hütwohl","Christof Iserlohe","Thomas Keilig","Alfred Krabbe","Bastian Knieling","Karsten Schindler","Andreas Siggelkow","Rainer Strecker","Oliver Zeile"
],
"authors": [
{"first" : "Bernhard", "last" : "Schulz"},
{"first" : "Aaron", "last" : "Bryant"},
{"first" : "Christian", "last" : "Fischer"},
{"first" : "Nadine", "last" : "Fischer"},
{"first" : "Benjamin", "last" : "Greiner"},
{"first" : "Michael", "last" : "Hütwohl"},
{"first" : "Christof", "last" : "Iserlohe"},
{"first" : "Thomas", "last" : "Keilig"},
{"first" : "Alfred", "last" : "Krabbe"},
{"first" : "Bastian", "last" : "Knieling"},
{"first" : "Karsten", "last" : "Schindler"},
{"first" : "Andreas", "last" : "Siggelkow"},
{"first" : "Rainer", "last" : "Strecker"},
{"first" : "Oliver", "last" : "Zeile"}
],
"abstract": "During 783 scientific flights, SOFIA, the Stratospheric Observatory for Infrared Astronomy of the space agencies of Germany and the United States, DLR and NASA, respectively, collected a considerable volume of scientific data, that is available through the Infrared Science Archive at IPAC. After the end of flight operations in September 2022, with only one year of ramp-down time for Science Mission Operations remaining, only a limited data reprocessing of Cycles 5 to 9 could be achieved. In order to complete the job and ensure a full exploitation of the considerable investment in SOFIA, the Institute of Spaceflight Systems of the University of Stuttgart, the home of the German SOFIA Institute (DSI), submitted a proposal to DLR to create a SOFIA Data Center (SDC) with a more comprehensive plan for a five-year post operational phase. The proposal was accepted and funded and the project started in July 2024. This contribution will make a brief assessment of the history and outlook of Far-Infrared (FIR) astronomical observatories, and discuss the SDC's plans to perform a more comprehensive reprocessing of all stored SOFIA data. We will use upgraded data processing pipelines, with improved pointing reconstruction, derived from guide camera imagery and new corrections for atmospheric water vapor and instrumental effects. The science data - re-ordered by astronomical criteria - will be stored along with the technical and operational engineering data of the telescope in a searchable, VO-compatible, publicly accessible archive. The newly formed SDC draws from the experience of the former DSI and seeks collaboration with scientists and engineers, that still hold knowledge of SOFIA operations and instrumentation. Once the SDC work is complete after 5 years, the archive will be transferred to the new German Astrophysics Center (DZA) as a long-term home. We expect to work with the entire astronomical community to promote the exploitation and publication of valuable Mid- and Far-Infrared data, establish a powerful scientific resource for the post-mission phase, and bridge the gap until the next space- or stratospheric FIR observatory becomes available....",
"bibcode" : "2025AAS...24520911S",
"bibtexKey": "schulz2025helping"
}
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"type" : "Publication",
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"label" : "Pluto's Atmosphere Persists",
"user" : "asteroidguy",
"description" : "",
"date" : "2025-12-15 18:18:21",
"changeDate" : "2025-12-15 18:41:10",
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"pub-type": "misc",
"journal": "AAS/Division for Planetary Sciences Meeting Abstracts",
"year": "2023",
"url": "",
"author": [
"Amanda Sickafoose","Michael Person","Carlos Zuluaga","Amanda Bosh","Stephen Levine","Tim Brothers","Bastian Knieling","Tim Lister","David Osip","Patricio Rojo","Karsten Schindler","Joseph Brimacombe","Timothy Carruthers","Abigail Colclasure","Petro Janse van Rensburg","Anja Genade","Stephen Potter"
],
"authors": [
{"first" : "Amanda", "last" : "Sickafoose"},
{"first" : "Michael", "last" : "Person"},
{"first" : "Carlos", "last" : "Zuluaga"},
{"first" : "Amanda", "last" : "Bosh"},
{"first" : "Stephen", "last" : "Levine"},
{"first" : "Tim", "last" : "Brothers"},
{"first" : "Bastian", "last" : "Knieling"},
{"first" : "Tim", "last" : "Lister"},
{"first" : "David", "last" : "Osip"},
{"first" : "Patricio", "last" : "Rojo"},
{"first" : "Karsten", "last" : "Schindler"},
{"first" : "Joseph", "last" : "Brimacombe"},
{"first" : "Timothy", "last" : "Carruthers"},
{"first" : "Abigail", "last" : "Colclasure"},
{"first" : "Petro", "last" : "Janse van Rensburg"},
{"first" : "Anja", "last" : "Genade"},
{"first" : "Stephen", "last" : "Potter"}
],
"abstract": "Pluto has a tenuous atmosphere with microbar-level surface pressure, composed primarily of nitrogen and containing a layered haze made of organic materials. An eccentric orbit combined with high obliquity leads to significant changes in solar insolation at different latitudes throughout the Plutonian year. Because the atmosphere is supported through vapor-pressure equilibrium with the surface ices, changes in surface conditions are intimately linked with the properties of the atmosphere. Thermophysical, volatile-transport models have been employed to anticipate Pluto's atmospheric evolution: predictions include atmospheric contraction or even collapse over the coming decades as well as an atmosphere that remains through the entire 248-yr revolution around the Sun (e.g. Young, 2013, ApJ Lett., 766, L22; Hansen et al. 2015, Icarus, 246, 183; Bertrand et al. 2018, Icarus, 309, 277; Johnson et al. 2021, Icarus, 356, id.114070). Previous work reported that Pluto's atmospheric pressure has been monotonically increasing since its definitive discovery in 1988 through 2016 (Meza et al. 2019, A&A, 625, id.A136) and then that the atmosphere had possibly begun freezing out in 2018-2019 (Arimatsu et al. 2020, A&A 638, L5; Young et al. 2021, AAS DPS Meeting #53, id.307.06). Observations of an occultation in 2020 did not show a pressure drop and were interpreted to be either a continued pressure increase (Poro et al. 2021, A&A, 652, L7) or a plateau phase (Sicardy et al. 2021, ApJ Lett, 923, L31). Here, we report results from nine successfully-observed stellar occultations by Pluto between 2017 August and 2022 August. The stellar magnitudes ranged from G=12.91 to 17.76 with geocentric relative velocities between 1.7 and 24.3 km/s. Four of these events had successful chords from multiple sites, while five events were from single sites. Our results indicate that Pluto's atmospheric pressure has been roughly holding steady since the New Horizons spacecraft flyby in 2015 and does not show any signs of collapse as of August 2022....",
"bibcode" : "2023DPS....5530802S",
"bibtexKey": "sickafoose2023plutos"
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,
{
"type" : "Publication",
"id" : "https://puma.ub.uni-stuttgart.de/bibtex/2dfebe353b8c5126edd9d738c926da6f0/asteroidguy",
"tags" : [
"ATUS","astronomy","imported","myown"
],
"intraHash" : "dfebe353b8c5126edd9d738c926da6f0",
"interHash" : "f9b7e3c0c5b5df293015240a9bbfc5ff",
"label" : "Doomed Worlds. II. Reassessing Suggestions of Orbital Decay for TrES-5 b",
"user" : "asteroidguy",
"description" : "",
"date" : "2025-12-15 18:18:21",
"changeDate" : "2025-12-15 18:38:13",
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"pub-type": "article",
"journal": "The Planetary Science Journal",
"year": "2025",
"url": "https://doi.org/10.3847/PSJ/ae1b9c",
"author": [
"Marvin Rothmeier","Elisabeth R. Adams","Karsten Schindler","André Beck","Brian Jackson","Jeffrey P. Morgenthaler","Amanda A. Sickafoose","Malia Barker","Luigi Mancini","John Southworth","Daniel Evans","Alfred Krabbe"
],
"authors": [
{"first" : "Marvin", "last" : "Rothmeier"},
{"first" : "Elisabeth R.", "last" : "Adams"},
{"first" : "Karsten", "last" : "Schindler"},
{"first" : "André", "last" : "Beck"},
{"first" : "Brian", "last" : "Jackson"},
{"first" : "Jeffrey P.", "last" : "Morgenthaler"},
{"first" : "Amanda A.", "last" : "Sickafoose"},
{"first" : "Malia", "last" : "Barker"},
{"first" : "Luigi", "last" : "Mancini"},
{"first" : "John", "last" : "Southworth"},
{"first" : "Daniel", "last" : "Evans"},
{"first" : "Alfred", "last" : "Krabbe"}
],
"doi" : "10.3847/PSJ/ae1b9c",
"bibtexKey": "rothmeier2025doomed"
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,
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"type" : "Publication",
"id" : "https://puma.ub.uni-stuttgart.de/bibtex/2c5d224f36cba7108942a4def48bb5d5d/asteroidguy",
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"imported"
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"intraHash" : "c5d224f36cba7108942a4def48bb5d5d",
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"label" : "Material around the Centaur (2060) Chiron from the 2018 November 28 UT Stellar Occultation",
"user" : "asteroidguy",
"description" : "",
"date" : "2025-12-15 18:18:21",
"changeDate" : "2025-12-15 18:18:21",
"count" : 2,
"pub-type": "article",
"journal": "The Planetary Science Journal",
"year": "2023",
"url": "",
"author": [
"Amanda A. Sickafoose","Stephen E. Levine","Amanda S. Bosh","Michael J. Person","Carlos A. Zuluaga","Bastian Knieling","Mark C. Lewis","Karsten Schindler"
],
"authors": [
{"first" : "Amanda A.", "last" : "Sickafoose"},
{"first" : "Stephen E.", "last" : "Levine"},
{"first" : "Amanda S.", "last" : "Bosh"},
{"first" : "Michael J.", "last" : "Person"},
{"first" : "Carlos A.", "last" : "Zuluaga"},
{"first" : "Bastian", "last" : "Knieling"},
{"first" : "Mark C.", "last" : "Lewis"},
{"first" : "Karsten", "last" : "Schindler"}
],
"abstract": "A stellar occultation of Gaia DR3 2646598228351156352 by the Centaur (2060) Chiron was observed from the South African Astronomical Observatory on 2018 November 28 UT. Here we present a positive detection of material surrounding Chiron from the 74-inch telescope for this event. Additionally, a global atmosphere is ruled out at the tens of microbars level for several possible atmospheric compositions. There are multiple 3σ drops in the 74-inch light curve: three during immersion and two during emersion. Occulting material is located between 242 and 270 km from the center of the nucleus in the sky plane. Assuming the ring-plane orientation proposed for Chiron from the 2011 occultation, the flux drops are located at 352, 344, and 316 km (immersion) and 357 and 364 km (emersion) from the center, with normal optical depths of 0.26, 0.36, and 0.22 (immersion) and 0.26 and 0.18 (emersion) and equivalent widths between 0.7 and 1.3 km. This detection is similar to the previously proposed two-ring system and is located within the error bars of that ring-pole plane; however, the normal optical depths are less than half of the previous values, and three features are detected on immersion. These results suggest that the properties of the surrounding material have evolved between the 2011, 2018, and 2022 observations....",
"arxiv" : "2310.16205",
"bibcode" : "2023PSJ.....4..221S",
"doi" : "10.3847/PSJ/ad0632",
"bibtexKey": "sickafoose2023material"
}
]
}