scholarly journals Some physical properties predicted for the putative Planet Nine of the solar system

2016 ◽  
Vol 592 ◽  
pp. A86 ◽  
Author(s):  
I. Toth
Keyword(s):  
Solar System ◽  
Physical Properties

scholarly journals Comets

1998 ◽  
Vol 11 (2) ◽  
pp. 1155-1156
Author(s):  
H.U. Keller
Keyword(s):  
Solar System ◽  
Physical Properties ◽  
Data Reduction ◽  
Kuiper Belt ◽  
Preliminary Results ◽  
Open Time ◽  
Transneptunian Objects ◽  
Selection For

Comets, the most pristine members of our solar system, are faint at large heliocentric distances (rh > 3 au) and therefore difficult to observe. Data reduction of these faint objects (periodic comets) is time consuming and hence most often just preliminary results can be discussed. Only the orbits of short periodic comets can be predicted and most of those that have been accessible for ISO have been covered within the guaranteed time programme. About 10 proposals were accepted by the selection for open time proposals. A target of opportunity team was formed. The outstanding comet Hale-Bopp (C/1995 01), one of the brightest and therefore most active comets of this century, was suggested and accepted as TOO. The important results from the ISO cometary programme are derived from its observations. In addition to the observations of "classic" comets the newly detected (Jewitt and Luu, 1993) transneptunian objects, probably objects from the Kuiper belt, are observed in an attempt to determine their physical properties.

Precise positions of Triton in 2010–2014 based on Gaia-DR2

2021 ◽  
Author(s):  
Huiyan Zhang ◽  
Yong Yu ◽  
Dan Yan ◽  
Kai Tang ◽  
Rongchuan Qiao
Keyword(s):  
Solar System ◽  
Physical Properties ◽  
Orbital Evolution ◽  
Astronomical Observatory ◽  
Standard Errors ◽  
Origin And Evolution ◽  
Important Target ◽  
Long Time ◽  
Gaia Dr2

Abstract With unique orbital and physical characteristics, Triton is a very important target since it may contain information of the origin and evolution of the solar system. Besides space explorations, ground-based observations over long time also play key role on research of Triton. High-precision positions of Triton obtained from ground telescopes are of great significance for studying its orbital evolution and inverting the physical properties of Neptune. As a long-term observational target, Triton has been observed by the 1.56 m telescope of Shanghai Astronomical Observatory since 1996. In this paper, based on our AAPPDI software and with Gaia DR2 as the reference catalogue, 604 positions of Triton during 2010-2014 are calculated, with standard errors of $19mas-88mas$. A comparison between our results and the ephemeris (DE431+nep096) is also given.

scholarly journals Scattering Properties of Dust Particles in Weightlessness

1996 ◽  
Vol 150 ◽  
pp. 415-418 ◽  
Author(s):  
J. C. Worms ◽  
A.C. Levasseur-Regourd ◽  
E. Hadamcik ◽  
D. Bourras
Keyword(s):  
Solar System ◽  
Physical Properties ◽  
Dust Particles ◽  
Preliminary Results ◽  
Maximum Polarization ◽  
Microgravity Conditions

AbstractPolarimetric measurements of the light scattered by irregular dust particles are essential to interpret observations of solar system dust in terms of its physical properties. We developed a iight scattering unit to retrieve polarimetric phase curves of dust samples in microgravity conditions. Preliminary results suggest that the values for the maximum polarization are higher under 1 “ g ” than under 0 “ g ” This can be compared to ground-based measurements which exhibit higher values for packed dust than for sifted dust. The unit is operational and is used to help design a related orbital experiment.

scholarly journals The Motions of Uranus' Satellites: Theory and Application

1979 ◽  
Vol 81 ◽  
pp. 177-180
Author(s):  
Richard Greenberg
Keyword(s):  
Solar System ◽  
Physical Properties ◽  
Celestial Mechanics ◽  
Dynamical Theory ◽  
System Study ◽  
Broad Application ◽  
Origin And Evolution ◽  
Structure And Dynamics ◽  
Principal Source ◽  
Planets And Satellites

As spacecraft and sophisticated ground-based observations measure physical properties of many planets and satellites, dynamical theory and astrometry remain a principal source of such knowledge of the Uranian system. Study of the motions of Uranus' satellites thus has broad application to planetary studies as well as to celestial mechanics. Moreover, the structure and dynamics of the system provide important cosmogonical constraints; any theory of solar system origin and evolution must account for the formation within it of analogous systems of regular satellites.

scholarly journals Icy Dwarf Planets: Colored Popsicles in the Outer Solar System

2015 ◽  
Vol 11 (A29A) ◽  
pp. 241-246
Author(s):  
Noemi Pinilla-Alonso
Keyword(s):  
Solar System ◽  
Physical Properties ◽  
Physical Characteristics ◽  
Outer Solar System ◽  
Dwarf Planets

AbstractWe update the list of candidates to be considered by the IAU as dwarf planets using the criterium suggested by Tancredi & Favre (2008). We add here the information collected in the last 10 years (mostly the sizes and albedos by the herschel hey program TNOs Are Cool). We compare the physical characteristics of these candidates with the physical characteristics of the rest of the TNOs. Our goal is to study if there are common physical properties among the candidates that enable the identification of a dwarf planet.

scholarly journals The multi-chord stellar occultation by (19521) Chaos on 2020 November 20

2021 ◽  
Author(s):  
Mónica Vara-Lubiano ◽  
Nicolás Morales ◽  
Flavia Rommel ◽  
José Luis Ortiz ◽  
Bruno Sicardy ◽  
...  
Keyword(s):  
Solar System ◽  
Physical Properties ◽  
Sierra Nevada ◽  
Financial Support ◽  
European Space Agency ◽  
State Agency ◽  
Equivalent Diameter ◽  
Stellar Occultation ◽  
Stellar Occultations ◽  
Calar Alto

<p>Physical properties of Trans-Neptunian Objects (TNOs) have been of increasing interest in the last two decades, as these objects are considered to be among the least altered through the Solar System evolution, and thus preserve valuable information about its origin [1]. The study of these objects through the ground-based method of stellar occultations has risen in the last years, as this technique allows the determination of physical properties with considerably good accuracies [2,3,4]. </p> <p>Here we present the results of the multi-chord stellar occultation of the GAIA source 3444789965847631104 (m<sub>v</sub>≈16.8) by the TNO (19521) Chaos on 2020 November 20, which was predicted within our systematic programme on stellar occultations by TNOs and outer solar system bodies [5]. The prediction was updated with astrometric observations carried out two days before the event with the 1.23-m telescope at Calar Alto observatory in Almería, Spain, and it was favorable to the South of Europe. The campaign that we organized involved 19 observing sites and resulted in three positive detections, one of them obtained from the 4.2-m WHT telescope at La Palma, 11 negative detections, and 5 sites that could not observe due to bad weather.<em> </em></p> <p>We derived the instantaneous limb of Chaos by fitting the extremities of the positive chords to an ellipse to determine accurate size, shape, and geometric albedo for this object. The preliminary results give a slightly smaller area-equivalent diameter than the one derived from Herschel thermal data [6], but photometric observations of this object are still under analysis to complement and improve the results. <strong><br /><br /></strong><strong>References</strong></p> <p>[1] Morbidelli, A., Levison, H. F., & Gomes, R. 2008, ed. M. A. Barucci, H. Boehnhardt, D. P. Cruikshank, A. Morbidelli, R. Dotson, 275</p> <p>[2] Ortiz, J. L., Sicardy, B., Braga-Ribas, F., et al. 2012, Nature, 491, 566</p> <p>[3] Braga-Ribas, F., Sicardy, B., Ortiz, J. L., et al. 2013, ApJ, 773, 26</p> <p>[4] Ortiz, J.L., Santos-Sanz, P., Sicardy, B., et al. 2017, Nature, 550, 7675, pp. 219-223</p> <p>[5] Camargo, J. I. B., Vieira-Martins, R., Assafin, M., et al. 2014, A&A, 561, A37</p> <p>[6] Vilenius, E., Kiss, C., Mommert, M., Müller, T., et al. 2012, A&A, 541, A94 </p> <p><strong>Acknowledgements</strong><strong> </strong></p> <p>We acknowledge financial support from the State Agency for Research of the Spanish MCIU through the "Center of Excellence Severo Ochoa" award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709). Part of the research leading to these results has received funding from the European Research Council under the European Community’s H2020 (2014-2020/ERC Grant Agreement no. 669416 “LUCKY STAR”). M.V-L. acknowledges funding from Spanish project AYA2017-89637-R (FEDER/MICINN). P.S-S. acknowledges financial support by the Spanish grant AYA-RTI2018-098657-J-I00 ``LEO-SBNAF'' (MCIU/AEI/FEDER, UE). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). We are grateful to the CAHA and OSN staffs. This research is partially based on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by Junta de Andalucía and Consejo Superior de Investigaciones Científicas (IAA-CSIC). This research was also partially based on observation carried out at the Observatorio de Sierra Nevada (OSN) operated by Instituto de Astrofísica de Andalucía (CSIC). Partially based on observations made with the Tx40 telescope at the Observatorio Astrofísico de Javalambre in Teruel, a Spanish Infraestructura Cientifico-Técnica Singular (ICTS) owned, managed and operated by the Centro de Estudios de Física del Cosmos de Aragón (CEFCA). Tx40 is funded with the Fondos de Inversiones de Teruel (FITE).</p>

OASI: A Brazilian Observatory Dedicated to the Study of Small Solar System Bodies—Some Results on NEO’s Physical Properties

2020 ◽  
Vol 132 (1012) ◽  
pp. 065001
Author(s):  
Eduardo Rondón ◽  
Daniela Lazzaro ◽  
Teresinha Rodrigues ◽  
Jorge M. Carvano ◽  
Fernando Roig ◽  
...  
Keyword(s):  
Solar System ◽  
Physical Properties ◽  
Solar System Bodies
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