The small binary asteroid (939) Isberga
B. Carry, A. Matter, P. Scheirich, P. Pravec, L. Molnar, S. Mottola,, A. Carbognani, E. Jehin, A. Marciniak, R. P. Binzel, F. E. DeMeo, M. Birlan,, M. Delbo, E. Barbotin, R. Behrend, M. Bonnardeau, F. Colas, P. Farissier, M., Fauvaud, S. Fauvaud, C. Gillier, M. Gillon

TL;DR
This study characterizes the surface, orbit, size, and density of the small binary asteroid (939) Isberga using multi-technique observations, providing the first direct size measurement of a small main-belt binary.
Contribution
It introduces a combined observational and modeling approach to determine the physical properties of a small binary asteroid, including size, orbit, and density.
Findings
Isberga is classified as an Sq-type asteroid.
The mutual orbit period is approximately 26.63 hours.
The system's density suggests significant macroporosity.
Abstract
In understanding the composition and internal structure of asteroids, their density is perhaps the most diagnostic quantity. We aim here to characterize the surface composition, mutual orbit, size, mass, and density of the small main-belt binary asteroid (939) Isberga. For that, we conduct a suite of multi-technique observations, including optical lightcurves over many epochs, near-infrared spectroscopy, and interferometry in the thermal infrared. We develop a simple geometric model of binary systems to analyze the interferometric data in combination with the results of the lightcurve modeling. From spectroscopy, we classify Ibserga as a Sq-type asteroid, consistent with the albedo of 0.14 (all uncertainties are reported as 3- range) we determine (average albedo of S-types is 0.197 0.153, Pravec et al., 2012, Icarus 221, 365-387). Lightcurve analysis…
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