Surface thermophysical properties on the potentially hazardous asteroid (99942) Apophis

Liangliang, Yu; Ji, Jianghui; Ip, W.-H.

doi:10.1088/1674-4527/17/7/70

Cited by 9 publications

(4 citation statements)

References 23 publications

(48 reference statements)

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“…Our derived thermal inertia result overlaps with estimated ranges cited in the previous studies. The same study by Müller et al (2014b) found a thermal inertia in the range of 250-800 J m −2s 1 2 K −1 with a best fit at 600 J m −2 - forward by Yu et al (2017). For comparison, Itokawa-an asteroid very similar to Apophis in size and taxonomic classwas measured to have Γ = 700 ± 200 J m −2s 1 2 K −1 by Müller et al (2014a).…”

Section: Thermal Models and Resultsmentioning

confidence: 84%

NEOWISE Observations of the Potentially Hazardous Asteroid (99942) Apophis

Satpathy¹,

Mainzer²,

Masiero³

et al. 2022

Planet. Sci. J.

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Large potentially hazardous asteroids (PHAs) are capable of causing a global catastrophe in the event of a planetary collision. Thus, rapid assessment of such an object’s physical characteristics is crucial for determining its potential risk scale. We treated the near-Earth asteroid (99942) Apophis as a newly discovered object during its 2020–2021 close approach as part of a mock planetary defense exercise. The object was detected by the Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE), and data collected by the two active bands (3.4 and 4.6 μm) were analyzed using thermal and thermophysical modeling. Our results indicate that Apophis is an elongated object with an effective spherical diameter D eff = 340 ± 70 m, a geometric visual albedo p V =0.31 ± 0.09, and a thermal inertia Γ ∼ 150–2850 J m−2 s − 1 2 K−1 with a best-fit value of 550 J m−2 s − 1 2 K−1. NEOWISE “discovery” observations reveal that (99942) Apophis is a PHA that would likely cause damage at a regional level and not a global one.

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Section: Thermal Models and Resultsmentioning

confidence: 84%

NEOWISE Observations of the Potentially Hazardous Asteroid (99942) Apophis

Satpathy¹,

Mainzer²,

Masiero³

et al. 2022

Planet. Sci. J.

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“…( 83 J m −2 K −1 s −1/2 matches very well. (99942) Apophis: For this object, we found four TI estimates (Müller et al 2014b;Licandro et al 2016;Yu et al 2017;Satpathy et al 2022), which are not always consistent or are subject to large uncertainties. Nevertheless, we include it in our validation list.…”

Section: Model Testing-further Verification On the Near-earth Asteroidsmentioning

confidence: 89%

ASTERIA—Asteroid Thermal Inertia Analyzer

Novaković,

Fenucci,

Marčeta

et al. 2024

Planet. Sci. J.

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Thermal inertia estimates are available for a limited number of a few hundred objects, and the results are practically solely based on thermophysical modeling (TPM). We present a novel thermal inertia estimation method, the Asteroid Thermal Inertia Analyzer (ASTERIA). The core of the ASTERIA model is the Monte Carlo approach, based on the Yarkovsky drift detection. We validate our model on asteroid Bennu plus 10 well-characterized near-Earth asteroids (NEAs) for which a good estimation of the thermal inertia from TPM exists. The tests show that ASTERIA provides reliable results consistent with the literature values. The new method is independent of TPM, allowing an independent verification of the results. As the Yarkovsky effect is more pronounced in small asteroids, the noteworthy advantage of ASTERIA compared to TPM is the ability to work with smaller asteroids, for which TPM typically lacks input data. We used ASTERIA to estimate the thermal inertia of 38 NEAs, with 31 of them being sub-kilometer-sized asteroids. Twenty-nine objects in our sample are characterized as potentially hazardous asteroids. On the limitation side, ASTERIA is somewhat less accurate than TPM. The applicability of our model is limited to NEAs, as the Yarkovsky effect is yet to be detected in main-belt asteroids. However, we can expect a significant increase in high-quality measurements of the input parameters relevant to ASTERIA with upcoming surveys. This will surely increase the reliability of the results generated by ASTERIA and widen the model’s applicability.

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“…Additionally, while an impact in 2029 has been ruled out, the potential for a future collision cannot be disregarded, and further study of the object is needed to refine this. In particular, the Yarkovsky effect has been shown to significantly alter predictions beyond 2029 and is sensitive to the physical parameters of Apophis, such as its albedo, diameter, and density (Farnocchia et al 2013;Yu et al 2017).…”

Section: Availability Of Solar System Bodiesmentioning

confidence: 99%

Terminus: A Versatile Simulator for Space-based Telescopes

Edwards

Stotesbury²

2021

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Space-based telescopes offer unparalleled opportunities for characterizing exoplanets, solar system bodies, and stellar objects. However, observatories in low-Earth orbits (e.g., Hubble, CHaracterising ExOPlanets Satellite, Twinkle, and an ever-increasing number of cubesats) cannot always be continuously pointed at a target due to Earth obscuration. For exoplanet observations consisting of transit, or eclipse, spectroscopy, this causes gaps in the light curve, which reduces the information content and can diminish the science return of the observation. Terminus, a time-domain simulator, has been developed to model the occurrence of these gaps to predict the potential impact on future observations. The simulator is capable of radiometrically modeling exoplanet observations as well as producing light curves and spectra. Here, Terminus is baselined on the Twinkle mission, but the model can be adapted for any space-based telescope and is especially applicable to those in a low-Earth orbit. Terminus also has the capability to model observations of other targets such as asteroids or brown dwarfs.Unified Astronomy Thesaurus concepts: Exoplanet atmospheres (487); Space telescopes (1547); Asteroids (72); Astronomical instrumentation (799); Infrared telescopes (794)

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Surface thermophysical properties on the potentially hazardous asteroid (99942) Apophis

Cited by 9 publications

References 23 publications

NEOWISE Observations of the Potentially Hazardous Asteroid (99942) Apophis

NEOWISE Observations of the Potentially Hazardous Asteroid (99942) Apophis

ASTERIA—Asteroid Thermal Inertia Analyzer

Terminus: A Versatile Simulator for Space-based Telescopes

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