Asteroid phase curves from ATLAS dual-band photometry

Mahlke, Max; Carry, B.; Denneau, L.

doi:10.1016/j.icarus.2020.114094

Cited by 48 publications

(55 citation statements)

References 53 publications

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“…The reason why the X-complex and end members are so spread may be due to the fact that both groups are heterogeneous, comprising objects that have different compositions and albedos. According to Mahlke et al (2021), the H, G 1 , G 2 system can separate the different classes forming the X-complex based on phase curves, whereas this is not possible using the H, G 12 system.…”

Section: Asteroidmentioning

confidence: 99%

“…Large-scale photometric applications were further performed by Oszkiewicz et al (2011), who combined observations from multiple observatories and computed H, G 1 , G 2 and related H, G 12 magnitude system model parameters for more than 500 000 asteroids. In a recent study by Mahlke et al (2021), the absolute magnitudes and phase curve parameters of 94 777 asteroids were retrieved in the same systems using Bayesian parameter inference. They concluded that it is possible to estimate the degree of phase reddening in the spectral slope from the G 1 and G 2 parameters and that the phase curve parameters provide a new dimension for taxonomic classification.…”

Section: Introductionmentioning

confidence: 99%

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Asteroid absolute magnitudes and phase curve parameters from Gaia photometry

Martikainen

Muinonen

Penttilä

et al. 2021

A&A

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Aims. We perform light curve inversion for 491 asteroids to retrieve phase curve parameters, rotation periods, pole longitudes and latitudes, and convex and triaxial ellipsoid shapes by using the sparse photometric observations from Gaia Data Release 2 and the dense ground-based observations from the DAMIT database. We develop a method for the derivation of reference absolute magnitudes and phase curves from the Gaia data, allowing for comparative studies involving hundreds of asteroids. Methods. For both general convex shapes and ellipsoid shapes, we computed least-squares solutions using either the Levenberg-Marquardt optimization algorithm or the Nelder-Mead downhill simplex method. Virtual observations were generated by adding Gaussian random errors to the observations, and, later on, a Markov chain Monte Carlo method was applied to sample the spin, shape, and scattering parameters. Absolute magnitude and phase curve retrieval was developed for the reference geometry of equatorial illumination and observations based on model magnitudes averaged over rotational phase. Results. The derived photometric slope values showed wide variations within each assumed Tholen class. The computed Gaia G-band absolute magnitudes matched notably well with the V-band absolute magnitudes retrieved from the Jet Propulsion Laboratory Small-Body Database. Finally, the reference phase curves were well fitted with the H, G1, G2 phase function. The resulting G1, G2 distribution differed, in an intriguing way, from the G1, G2 distribution that is based on the phase curves corresponding to light curve brightness maxima.

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Section: Asteroidmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Asteroid absolute magnitudes and phase curve parameters from Gaia photometry

Martikainen

Muinonen

Penttilä

et al. 2021

A&A

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“…SkyMapper is still operating and we plan to release observations of SSOs in upcoming data releases. SkyMapper near-simultaneous acquisition of different filters provides instantaneous determination of col-ors, which can be used by the community even with the start of operations of the upcoming Legacy Survey of Space and Time (LSST) by the Vera C. Rubin observatory, which will require years to build the phase functions needed to determine SSO colors (Jones et al 2009;Mahlke et al 2021).…”

Section: Future Workmentioning

confidence: 99%

“…While Catalina observed the most, it only has a wide optical filter. ATLAS uses two filters and its observing cadence allows for phase functions to be constructed (Mahlke et al 2021), and a single color can be used for rough taxonomic classification (see Subsection 7.3 and Erasmus et al 2020). Pan-STARRS has lately contributed to most NEA discoveries, but has relied on g, r, i, and a wide w filter, precluding spectral classification as the z filter probes the 1 µm band (the most characteristic Article number, page 7 of 16 A&A proofs: manuscript no.…”

Section: Future Workmentioning

confidence: 99%

Multifilter photometry of Solar System objects from the SkyMapper Southern Survey

Sergeyev

Carry

Onken

et al. 2022

A&A

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Context. The populations of small bodies of the Solar System (asteroids, comets, and Kuiper Belt objects) are used to constrain the origin and evolution of the Solar System. Their orbital distribution and composition distribution are both required to track the dynamical pathway from their formation regions to their current locations. Aims. We aim to increase the sample of Solar System objects (SSOs) that have multifilter photometry and compositional taxonomy. Methods. We searched for moving objects in the SkyMapper Southern Survey. We used the predicted SSO positions to extract photometry and astrometry from the SkyMapper frames. We then applied a suite of filters to clean the catalog from false-positive detections. We finally used the near-simultaneous photometry to assign a taxonomic class to objects. Results. We release a catalog of 880,528 individual observations, consisting of 205,515 known and unique SSOs. The catalog completeness is estimated to be about 97% down to V=18 mag and the purity is higher than 95% for known SSOs. The near-simultaneous photometry provides either three, two, or a single color that we use to classify 117,356 SSOs with a scheme consistent with the widely used Bus-DeMeo taxonomy. Conclusions. The present catalog contributes significantly to the sample of asteroids with known surface properties (about 40% of main-belt asteroids down to an absolute magnitude of 16). We will release more observations of SSOs with future SkyMapper data releases.

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“…where V(1, 1, α) is the reduced magnitude and f(α) is the phase function. Phase curves can help to constrain the absolute magnitudes, albedos, and likely taxonomic classifications of asteroids (e.g., Bowell et al 1989;Oszkiewicz et al 2012;Penttilä et al 2016), and can also be used to extend the parameter space for classifying and studying asteroid families (Mahlke et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Asteroid Photometry with PIRATE: Optimizations and Techniques for Small Aperture Telescopes

Jackson¹,

Kolb²,

Green³

2021

PASP

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Small aperture telescopes provide the opportunity to conduct high frequency, targeted observations of near-Earth Asteroids that are not feasible with larger facilities due to highly competitive time allocation requirements. Observations of asteroids with these types of facilities often focus on rotational brightness variations rather than longer-term phase angle-dependent variations (phase curves) due to the difficulty of achieving high precision photometric calibration. We have developed an automated asteroid light curve extraction and calibration pipeline for images of moving objects from the 0.43 m Physics Innovations Robotic Telescope Explorer. This allows for the frequency and quality of observations required to construct asteroid phase curves. Optimizations in standard data reduction procedures are identified that may allow for similar small aperture facilities, constructed from commercially available/off-the-shelf components, to improve the image and subsequent data quality. A demonstration of the hardware and software capabilities is expressed through observation statistics from a 10 months observing campaign, and through the photometric characterization of near-Earth Asteroids 8014 (1990 MF) and 19764 (2000 NF5).

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Asteroid phase curves from ATLAS dual-band photometry

Cited by 48 publications

References 53 publications

Asteroid absolute magnitudes and phase curve parameters from Gaia photometry

Asteroid absolute magnitudes and phase curve parameters from Gaia photometry

Multifilter photometry of Solar System objects from the SkyMapper Southern Survey

Asteroid Photometry with PIRATE: Optimizations and Techniques for Small Aperture Telescopes

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