The 2019 October 22nd multi-chord stellar occultation by (84922)  2003 VS2

Vara-Lubiano, Mónica; Benedetti-Rossi, G.; Santos-Sanz, P.; Ortiz, J. L.; Sicardy, B.; Popescu, Marcel; Morales, N.; Rommel, F. L.; Morgado, B. E.; Pereira, C. L.

doi:10.5194/epsc2020-1041

Cited by 2 publications

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“…Such displacement had a value of 55 km (4 s). In a second scenario (S2), we have decided to align the centers of the chords as done in other stellar occultation works, to account for possible needed time-shifts (e.g., Vara-Lubiano et al 2022;Santos-Sanz et al 2022). We performed a weighed linear fit to the centers of all the chords, and then shifted all the chords so that their centers would lay on that linear fit.…”

Section: Discussionmentioning

confidence: 99%

The multichord stellar occultation by the centaur Bienor on January 11, 2019

Fernández-Valenzuela

Morales

Vara-Lubiano

et al. 2023

A&A

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Within our program of physical characterization of trans-Neptunian objects and centaurs, we predicted a stellar occultation by the centaur (54598) Bienor to occur on January 11, 2019, with good observability potential. We obtained high accuracy astrometric data to refine the prediction, resulting in a shadow path favorable for the Iberian Peninsula. This encouraged us to carry out an occultation observation campaign that resulted in five positive detections from four observing sites. This is the fourth centaur for which a multichord (more than two chords) stellar occultation has been observed so far, the other three being (2060) Chiron, (10199) Chariklo, and (95626) 2002 GZ 32 . From the analysis of the occultation chords, combined with the rotational light curve obtained shortly after the occultation, we determined that Bienor has an area-equivalent diameter of 150 ± 20 km. This diameter is ∼ 30 km smaller than the one obtained from thermal measurements. The position angle of the short axis of the best fitting ellipse obtained through the analysis of the stellar occultation does not match that of the spin axis derived from long-term photometric models. We also detected a strong irregularity in one of the minima of the rotational light curve that is present no matter the aspect angle at which the observations were done. We present different scenarios to reconcile the results from the different techniques. We did not detect secondary drops related to potential rings or satellites. Nonetheless, similar rings in size to that of Chariklo's cannot be discarded due to low data accuracy.

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Section: Discussionmentioning

confidence: 99%

The multichord stellar occultation by the centaur Bienor on January 11, 2019

Fernández-Valenzuela

Morales

Vara-Lubiano

et al. 2023

A&A

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“…For instance, a double-peaked rotational light-curve presenting different depths among the minima and maxima might indicate that a tri-axial shape is more likely than an oblate spheroid with an albedo spot. This is the case of ( 20000) Varuna (e.g., Jewitt et al, 2001;Fernández-Valenzuela et al, 2019), (84922) 2003 VS 2 (Vara-Lubiano et al, 2020), and (470599) 2008 OG 19 (Fernández-Valenzuela et al, 2019), among others. Note that detecting the difference between the brightness minima and/or the brightness maxima of the rotational light-curve requires high quality data, as is the case in the mentioned examples.…”

Section: Short-term Variability Of Trans-neptunian Objects and Centaursmentioning

confidence: 90%

Modeling Long-Term Photometric Data of Trans-Neptunian Objects and Centaurs

Fernández-Valenzuela

2022

Front. Astron. Space Sci.

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Trans-Neptunian objects and Centaurs are small Solar System bodies that reside in the outer parts of the Solar System. These objects present photometric behaviors that are influenced due to a change in their aspect angle. Using absolute photometric measurements and rotational light-curves at different locations on their orbits allows to model their photometric behavior and obtain physical properties such as pole orientation, shape, density, and even detecting different peculiarities as departure from hydrostatic equilibrium or rings. This work presents how these models are performed to extract different physical properties. A summary of the objects for which their long-term photometric behavior has been modeled is also given.

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The 2019 October 22nd multi-chord stellar occultation by (84922) 2003 VS2

Cited by 2 publications

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The multichord stellar occultation by the centaur Bienor on January 11, 2019

The multichord stellar occultation by the centaur Bienor on January 11, 2019

Modeling Long-Term Photometric Data of Trans-Neptunian Objects and Centaurs

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