Photometric characterization of NEOs: 3 Amor and 3 Apollo★

Rondón, Eduardo; Arcoverde, Plícida; Monteiro, F.; Medeiros, Hissa; Navas, Giuliat; Lazzaro, D.; Carvano, J. M.; Rodrigues, Teresinha

doi:10.1093/mnras/stz024

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…As previously mentioned, the main goal of the IMPACTON project is the physical characterization of NEOs, and these objects correspond to nearly 60% of all the observations made in the period 2011-2018 (Figure 7, top). We have observed different percentages of the several sub-population of NEOs (Figure 7, bottom), from Atiras to Atens, Apollos and Amors (Monteiro et al 2017(Monteiro et al , 2018a(Monteiro et al , 2018bPerna et al 2017;Rondón et al 2019). We have also observed a large number of MBA, ∼25% (Figure 7, top), because these objects are assumed to be the source of NEOs (Silva & Lazzaro 2015;Marciniak et al 2019;Martino et al 2019).…”

Section: Some Results From the Oasi Neo Samplementioning

confidence: 72%

“…The scientific aims of the observations performed at OASI include determination of rotation period, pole and shape through differential photometry, determination of solar phase curves and colors though flux-calibrated photometry, search for dust comae from measurements of radial profiles, and orbit determination/improvement from astrometric observations for selected targets (Monteiro et al 2017(Monteiro et al , 2018a(Monteiro et al , 2018bPerna et al 2017;Rondón et al 2019). More recently, the main focus of the observations has been to obtain a complete photometric characterization of the NEOs, observing the rotational light curve simultaneously to the phase curve and to the photometric spectrum, in order to get reliable physical parameters (Rondón et al 2019).…”

Section: Some Results From the Oasi Neo Samplementioning

confidence: 99%

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

Rondón

Lazzaro

Rodrigues

et al. 2020

PASP

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The distribution of professional observatories around the world is quite biased toward the Northern Hemisphere, and this tendency is even more pronounced when considering those dedicated only to the study of small solar system bodies. In the Southern Hemisphere, the IMPACTON project deployed the Observatório Astronômico do Sertão de Itaparica (OASI), dedicated to the observation of minor bodies of the solar system with emphasis on Near-Earth Objects (NEOs). The observatory is located at the county of Itacuruba, in the Pernambuco State of Brazil, and operate a 1 m Cassegrain telescope. Here, we present a complete characterization of the OASI instruments and the sky conditions during the first eight years of operations. The limiting magnitudes are determined in the different available filters. The median seeing results to be 1 22, with a higher number of photometric nights from April to October. We also give an overview of the results obtained from the OASI observations and discuss them in the light of similar data from the literature. In particular, the rotational periods of 23 NEOs, and the spin directions and shapes of 9 NEOs, have been determined for the very first time using our observations. Analyzing rotational periods, sizes and taxonomic classification from the literature and OASI, we conclude that the fast rotating NEOs are predominantly S-type objects. However, rotational periods obtained at the OASI and with similar value from LCDB database allowed to identify the first fast rotator C-type NEO: asteroid 436724. With an estimated tensile strength as low as 0.5 KPa, this asteroid allows us to suggest that it defines the border between the C-and S-type fast rotators in the size versus period diagram. Although this hypothesis is based on a very small sample it is compatible with all presently available data. Only new observations, however, can prove if this hypothesis is correct.

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Section: Some Results From the Oasi Neo Samplementioning

confidence: 72%

Section: Some Results From the Oasi Neo Samplementioning

confidence: 99%

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

Rondón

Lazzaro

Rodrigues

et al. 2020

PASP

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“…As for 2015 RN 35 , in addition to the small gravity, the short rotation period of about 20 minutes also supports the hypothesis of the lack of fine regolith. Other recent studies showed that there is almost no correlation between albedo and slope parameters using the phase curves obtained in the framework of the IMPACTON project and the ATLAS survey (Rondón et al 2019;Arcoverde et al 2023). They interpreted that this is due to the difference in diameters of NEAs and MBAs.…”

Section: Possible Classification Of 2015 Rn 35mentioning

confidence: 96%

“…The visible geometric albedo of about 0.4 derived from the slope of the phase curve is consistent with the nearinfrared spectrum of 2004 BL 86 , which implies that 2004 BL 86 is a typical high-albedo V-type asteroid. Recently, several dozen phase curves of NEAs have been studied in the framework of the IMPACTON project (Rondón et al 2019(Rondón et al , 2022Ieva et al 2022;Arcoverde et al 2023). This project created a database with phase curves of 30 NEAs using three 1 m class telescopes in Brazil and Italy (Arcoverde et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Multicolor Photometry of Tiny Near-Earth Asteroid 2015 RN₃₅ across a Wide Range of Phase Angles: Possible Mission-accessible A-type Asteroid

Beniyama,

Ohsawa,

Avdellidou

et al. 2023

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Studying small near-Earth asteroids is important in order to understand their dynamical histories and origins as well as to mitigate the damage caused by asteroid impacts on Earth. We report the results of multicolor photometry of the tiny near-Earth asteroid 2015 RN35 using the 3.8 m Seimei telescope in Japan and the TRAPPIST-South telescope in Chile over 17 nights in 2022 December and 2023 January. We observed 2015 RN35 across a wide range of phase angles from 2° to 30° in the g, r, i, and z bands in the Pan-STARRS system. These lightcurves show that 2015 RN35 is in a nonprincipal axis spin state with two characteristic periods of 1149.7 ± 0.3 s and 896.01 ± 0.01 s. We found that the slope of the visible spectrum of 2015 RN35 is as red as asteroid (269) Justitia, one of the very red objects in the main belt, which indicates that 2015 RN35 can be classified as an A- or Z-type asteroid. In conjunction with the shallow slope of the phase curve, we suppose that 2015 RN35 is a high-albedo A-type asteroid. We demonstrated that surface properties of tiny asteroids could be well constrained by intensive observations across a wide range of phase angles. 2015 RN35 is a possible mission-accessible A-type near-Earth asteroid with a small Δv of 11.801 km s−1 in the launch window between 2030 and 2035.

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“…Thus, the reflectance spectrum provides clues about asteroid surface physical properties and compositions. To derive the photometric spectrum we carried out the same procedure followed by Rondón et al (2019). For OASI images, in the SDSS filters, we transformed the asteroid colour indices (m g − m r ) A , (m i − m r ) A , and (m z − m r ) A to normalized reflectance at the r filter by removing the solar colours (m g − m r ) , (m i − m r ) , (m z − m r ) , 1 and we rescaled the g, i, and z reflectance using the equation ( 4).…”

Section: Photometric Spectrummentioning

confidence: 99%

Physical characterization of equal-mass binary near-Earth asteroid 2017 YE5: a possible dormant Jupiter-family comet

Monteiro

Rondón

Lazzaro

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Photometric observations of the nearly equal-mass binary near-Earth asteroid 2017 YE5 were carried out at the Observatório Astronômico do Sertão de Itaparica (OASI, Brazil) and at the Blue Mountains Observatory (BMO, Australia) between July and August 2018, shortly after it made a close approach to Earth in June 2018. These observations allowed to determine an orbital period of the system in good agreement with the result of the radar observations. Our results also indicate that the 2017 YE5 system is not fully locked in a synchronous spin-orbit resonance, as there is a possible asynchronous component or tumbling rotator in the system. Additional data obtained at the Observatorio Astronómico Nacional de San Pedro Mártir (OAN-SPM, Mexico) in August 2018 allowed to derive the colour indices and the low resolution spectrum, which indicate that the object has a very reddish surface similar to the outer Solar system objetcs. This is consistent with a dark albedo of about 3 per cent, derived from an effective diameter of the combined components and an absolute magnitude of 19.2. Infrared data obtained at the NASA’s IRTF exhibit a thermal emission in the 2.5 μm range for which a low albedo of 2-4 per cent was adjusted by applying a thermal model. Regarding to the taxonomic classification, we found that the 2017 YE5 is a D-type in the Bus-DeMeo taxonomy. Therefore, according to our results and considering that the 2017 YE5 system has a typical comet orbit (TJ = 2.87), we suggest that it is a dormant Jupiter-family binary comet.

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Photometric characterization of NEOs: 3 Amor and 3 Apollo★

Cited by 9 publications

References 26 publications

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

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

Multicolor Photometry of Tiny Near-Earth Asteroid 2015 RN₃₅ across a Wide Range of Phase Angles: Possible Mission-accessible A-type Asteroid

Physical characterization of equal-mass binary near-Earth asteroid 2017 YE5: a possible dormant Jupiter-family comet

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Photometric characterization of NEOs: 3 Amor and 3 Apollo★

Cited by 9 publications

References 26 publications

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

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

Multicolor Photometry of Tiny Near-Earth Asteroid 2015 RN35 across a Wide Range of Phase Angles: Possible Mission-accessible A-type Asteroid

Physical characterization of equal-mass binary near-Earth asteroid 2017 YE5: a possible dormant Jupiter-family comet

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Multicolor Photometry of Tiny Near-Earth Asteroid 2015 RN₃₅ across a Wide Range of Phase Angles: Possible Mission-accessible A-type Asteroid