Significantly high polarization degree of the very low-albedo asteroid (152679) 1998 KU<sub>2</sub>

Kuroda, D.; Ishiguro, Masateru; Watanabe, Makoto; Hasegawa, Susumu; Sekiguchi, T.; Naito, H.; Usui, Fumihiko; Imaï, Masataka; Sato, Mitsuteru; Kuramoto, Kiyoshi

doi:10.1051/0004-6361/201732086

Cited by 10 publications

(15 citation statements)

References 81 publications

(93 reference statements)

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“…is not as steep as those of C-type asteroids, (101955) Bennu (Cellino et al 2018 ), (152679) 1998 KU 2 (Kuroda et al 2018 ), and ( 162173) Ryugu (Kuroda et al 2021 ). Because the polarization slope around the inversion angle is primarily dependent on the albedos but less dependent on particle sizes (Geake & Dollfus 1986 ), it is reasonable to hypothesize that 2005 UD and Phaethon have similar albedo values for the observed wavelength ( R C -band).…”

Section: Phase Angle Dependence Of Polarization Degreementioning

confidence: 92%

“…α 0 is sometimes notated as α inv in some literature. ( 2018 ), Lupishko et al ( 1995 ), Mukai et al ( 1997 ), Ishiguro et al ( 1997 ), Ishiguro et al ( 2017 ), Cellino et al ( 2018 ), Kuroda et al ( 2018 ), Kiselev, Rosenbush & Jockers ( 1999 ), and Kuroda et al ( 2021 ). (Zellner et al 1977 ) and the Meudon Observatory (Geake & Dollfus 1986 ).…”

Section: α 0 -P Min Relationmentioning

confidence: 99%

“…We show fitted curves of Phaethon only at α > 15 • because the fitting result in the ne gativ e branch looks strange because of the lack of data points. The references for comparison include Shinnaka et al ( 2018 ), Devog èle et al ( 2018 ), Ito et al( 2018 ),Lupishko et al ( 1995 ),Mukai et al ( 1997 ),Ishiguro et al ( 1997 ),Ishiguro et al ( 2017 ),Cellino et al ( 2018 ),Kuroda et al ( 2018 ),Kiselev, Rosenbush &Jockers ( 1999 ), andKuroda et al ( 2021 ).…”

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confidence: 99%

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Polarimetric properties of the near-Sun asteroid (155140) 2005 UD in comparison with other asteroids and meteoritic samples

Ishiguro

Bach

Geem

et al. 2021

Monthly Notices of the Royal Astronomical Society

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The investigation of asteroids near the Sun is important for understanding the final evolutionary stage of primitive Solar system objects. A near-Sun asteroid, (155140) 2005 UD, has orbital elements similar to those of (3200) Phaethon (the target asteroid for the JAXA’s DESTINY+ mission). We conducted photometric and polarimetric observations of 2005 UD and found that this asteroid exhibits a polarization phase curve similar to that of Phaethon over a wide range of observed solar phase angles (α = 20-105○) but different from those of (101955) Bennu and (162173) Ryugu (asteroids composed of hydrated carbonaceous materials). At a low phase angle (α ≲ 30○), the polarimetric properties of these near-Sun asteroids (2005 UD and Phaethon) are consistent with anhydrous carbonaceous chondrites, while the properties of Bennu are consistent with hydrous carbonaceous chondrites. We derived the geometric albedo, pV ∼ 0.1 (in the range of 0.088-0.109); mean V-band absolute magnitude, HV = 17.54 ± 0.02; synodic rotational period, Trot = 5.2388 ± 0.0022 hours (the two-peaked solution is assumed); and effective mean diameter, Deff = 1.32 ± 0.06 km. At large phase angles (α ≳ 80○), the polarization phase curve are likely explained by the dominance of large grains and the paucity of small micron-sized grains. We conclude that the polarimetric similarity of these near-Sun asteroids can be attributed to the intense solar heating of carbonaceous materials around their perihelia, where large anhydrous particles with small porosity could be produced by sintering.

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Section: Phase Angle Dependence Of Polarization Degreementioning

confidence: 92%

Section: α 0 -P Min Relationmentioning

confidence: 99%

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confidence: 99%

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Polarimetric properties of the near-Sun asteroid (155140) 2005 UD in comparison with other asteroids and meteoritic samples

Ishiguro

Bach

Geem

et al. 2021

Monthly Notices of the Royal Astronomical Society

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“…Cometary dust particles are a major component of the interplanetary dust, for which interpretations of remote observations have progressively been proposed with the help of numerical and experimental simulations. Asteroidal dust particles can present some similarities with them, at least when primitive asteroids are considered; C-type asteroids typically present a low albedo, probably a high porosity (Housen et al, 1999;Kuroda et al, 2017) and a phase curve similar to comets (Hadamcik et al, 2009a). The composition of the samples in the experimental simulations with mixture of silicates, carbon-black and coal for the CC, low albedo of the particles (Hadamcik et al, 2007a) is consistent with the Rosetta findings for cometary dust properties revealing the presence of numerous complex organics (Fray et al, 2016), in very large particles made of sub-micron sized grains in aggregates either compact or with very high porosities (Langevin et al, 2016;Mannel et al, 2016).…”

Section: Interplanetary Cometary and Asteroidal Dust Particles Analomentioning

confidence: 99%

Analogues of interplanetary dust particles to interpret the zodiacal light polarization

Hadamcik

Lasue

Levasseur-Regourd

et al. 2020

Planetary and Space Science

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Context: Some local properties of the dust particles that build the interplanetary dust cloud may be deduced from the light they scatter (with emphasize on their linear polarization). The ratio of organics (absorbing particles) to silicates (more transparent particles) was suggested through numerical simulations to reproduce the shape of the polarimetric phase curve and the decrease in polarization with decreasing solar distance. Aims: Reproducing these properties, through measurements on real dust particles lifted in microgravity conditions, in the PROGRA2 light scattering experiment. Using dust analogues with parameters similar to those derived from numerical simulations. Methods: Analogue particles, previously tested for the two main sources of dust in the inner interplanetary cloud (comets and asteroids) were used in the experiment. The ratio between fluffy aggregates and compact particles was kept constant. Five samples were studied, corresponding to mixtures with the organics / silicates ratio as defined in the numerical simulation Results: We show that we can reproduce by experimental simulations the polarimetric properties of particles present in the inner interplanetary dust cloud, i.e. their polarimetric phase curve in the symmetry plane at 1.5 au from the Sun and variations of polarization at a 90° phase angle as a function of the solar distance between 0.5 au and 1.5 au. The effect of the different parameters suggests a size distribution of the particles following a power law with coefficients of (-3 ± 0.5) for a size-range of 10-100 µm and (-4.4 ± 0.6) for a size range of 100-200 µm, with a steep cutoff at about 10 microns, a constant ratio of (35 ± 10) % in mass of fluffy aggregates versus compact particles and a decreasing ratio of organics with decreasing solar distance. Such results are discussed in the context of recent evidence on cometary dust particles from the Rosetta mission to a Jupiter family comet.

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“…The reflected light is polarized, and by measuring the degree of polarization, one can estimate the size of the regolith on the surface. Kuroda et al (2018) observed an extremely low-albedo asteroid in 1998, KU 2 . They obtained linear polarization degrees of 44.6% and 44.0% at a phase angle (Sun-asteroid-observer angle) of 81.0 • in the Rc-and V -bands, respectively.…”

Section: Introductionmentioning

confidence: 96%

Imaging Polarimetry of Geostationary Satellite Express-AM5

Kosaka¹,

Itoh²,

Saito³

et al. 2020

OAP

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This paper reports on the optical imaging polarimetry of geostationary satellite Express-AM5. Precise optical polarimetry was carried out using the Nayuta 2-m telescope at Nishi-Harima Astronomical Observatory and a polarimeter. V -band images were continuously taken in 312 minutes. The degree of polarization decreased with time until the minimum phase angle was reached at midnight, and then, it increased until morning. This change in the degree of polarization is well explained by the reflection of sunlight from monocrystalline solar panels of the satellite and possibly from other satellite components such as the antenna dishes and/or bus.

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Significantly high polarization degree of the very low-albedo asteroid (152679) 1998 KU₂

Cited by 10 publications

References 81 publications

Polarimetric properties of the near-Sun asteroid (155140) 2005 UD in comparison with other asteroids and meteoritic samples

Polarimetric properties of the near-Sun asteroid (155140) 2005 UD in comparison with other asteroids and meteoritic samples

Analogues of interplanetary dust particles to interpret the zodiacal light polarization

Imaging Polarimetry of Geostationary Satellite Express-AM5

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Significantly high polarization degree of the very low-albedo asteroid (152679) 1998 KU2

Cited by 10 publications

References 81 publications

Polarimetric properties of the near-Sun asteroid (155140) 2005 UD in comparison with other asteroids and meteoritic samples

Polarimetric properties of the near-Sun asteroid (155140) 2005 UD in comparison with other asteroids and meteoritic samples

Analogues of interplanetary dust particles to interpret the zodiacal light polarization

Imaging Polarimetry of Geostationary Satellite Express-AM5

Contact Info

Product

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Significantly high polarization degree of the very low-albedo asteroid (152679) 1998 KU₂