Neowise Studies of Spectrophotometrically Classified Asteroids: Preliminary Results

Mainzer, Amy; Grav, T.; Masiero, J.; Hand, Emma; Bauer, J. M.; Tholen, David J.; McMillan, R. S.; Spahr, T. B.; Cutri, R. M.; Wright, E. L.; Watkins, J. A.; Mo, Wenli; Maleszewski, C.

doi:10.1088/0004-637x/741/2/90

Cited by 228 publications

(369 citation statements)

References 44 publications

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“…A similar result was found by Mainzer et al (2011) for some classes and sub-classes of the Bus & Binzel taxonomic system, in particular the X-class, using the NEOWISE data set. Figure 6 shows the polarization curves found for M-and P-type asteroids and the observations for objects classified as X-type by Bus & Binzel (2002) that do have not been classified by Tholen (1989): (92) Undina, (184) Dejopeja, (276) Adelheid, (337) Devosa, (522) Helga, (739) Mandeville, (796) Sarita, and (3022) Dobermann.…”

Section: Resultssupporting

confidence: 82%

Polarimetric survey of main-belt asteroids

Cañada-Assandri

Gil-Hutton

Benavídez

2012

A&A

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Aims. We present results of a polarimetric survey of main-belt asteroids at Complejo Astronómico El Leoncito (Casleo), San Juan, Argentina. The aims of this survey are to increase the database of asteroid polarimetry, to estimate diversity in polarimetric properties of asteroids that belong to different taxonomic classes, and to search for objects that exhibit anomalous polarimetric properties. Methods. The data were obtained with the Torino and CASPROF polarimeters at the 2.15 m telescope. The Torino polarimeter is an instrument that allows the simultaneous measurement of polarization in five different bands, and the CASPROF polarimeter is a two-hole aperture polarimeter with rapid modulation. Results. The survey began in 2003, and up to 2009 data of a sample of more than 170 asteroids were obtained. In this paper the results for 33 X-type objects are presented, several of them are being polarimetrically observed for the first time. Using these data we found polarization curves and polarimetric parameters for different groups among this taxonomic class and that there are objects with very different albedo in the sub-classes of the X taxonomic complex.

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Section: Resultssupporting

confidence: 82%

Polarimetric survey of main-belt asteroids

Cañada-Assandri

Gil-Hutton

Benavídez

2012

A&A

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“…Using the absolute magnitude and the estimated size of the asteroid, we compute an albedo of p V = 0.44 ± 0.20. This value is slightly above the range of albedos for L-class objects (0.082−0.405) given in Mainzer et al (2011) for a sample of 72 L-types observed with WISE. According to these authors, very high albedo objects are suspected to have a G value different from the one typically assumed for asteroids (G = 0.15).…”

Section: Resultsmentioning

confidence: 52%

Visible and near-infrared observations of asteroid 2012 DA₁₄during its closest approach of February 15, 2013

León

Ortiz

Pinilla-Alonso

et al. 2013

A&A

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Context. Near-Earth asteroid 2012 DA 14 made its closest approach on February 15, 2013, when it passed at a distance of 27 700 km from the Earth's surface. It was the first time an asteroid of moderate size was predicted to approach that close to the Earth, becoming bright enough to permit a detailed study from ground-based telescopes. Aims. Asteroid 2012 DA 14 was poorly characterized before its closest approach. The main objective of this work was to obtain new and valuable data to better understand its physical properties, and to evaluate the effects of such a close approach on the object. Methods. We acquired data using several telescopes on four Spanish observatories: the 10.4 m Gran Telescopio Canarias (GTC) and the 3.6 m Telescopio Nazionale Galileo (TNG), both in the El Roque de los Muchachos Observatory (ORM, La Palma); the 2.2 m CAHA telescope, in the Calar Alto Observatory (Almería); the f /3 0.77 m telescope in the La Hita Observatory (Toledo); and the f /8 1.5 m telescope in the Sierra Nevada Observatory (OSN, Granada). We obtained visible and near-infrared color photometry, visible spectra and time-series photometry. Results. Visible spectra together with visible and near-infrared color photometry of 2012 DA 14 show that the object can be classified as an L-type asteroid, a rare spectral type among the asteroid population, with a composition similar to that of carbonaceous chondrites. The time-series photometry provides a rotational period of 8.95 ± 0.08 h after the closest approach, and there are indications that the object suffered a spin-up during this event. The large amplitude of the light curve suggests that the object is very elongated and irregular, with an equivalent diameter of around 18 m. We obtain an absolute magnitude of H R = 24.5 ± 0.2, corresponding to H V = 25.0 ± 0.2 in V. The GTC photometry also gives H V = 25.29 ± 0.14. Both values agree with the value listed at the Minor Planet Center (MPC) shortly after discovery, although H V is very sensitive to the slope parameter G used to correct for phase angle. From the absolute photometry, together with some constraints on size and shape, we compute a geometric albedo of p V = 0.44 ± 0.20, which is slightly above the range of albedos known for L-type asteroids (0.082−0.405).

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“…The p-value for the binned K-S test is 0.14 and is 0.11 using the Wilcoxon-MannWhitney test, consistent with the distributions being different at a marginal level of significance. A small selection of our Spitzer sample has SDSS derived taxonomic information (Carvano et al 2010); therefore, we can test preliminary results derived by the WISE team (Mainzer et al 2011b) which suggest an apparent trend for increased asteroid albedo with decreased size for S type asteroids. Table 6 presents the average albedo of each taxonomic type when SDSS and Spitzer results are cross referenced.…”

Section: Albedo Catalog Comparisonmentioning

confidence: 96%

The kilometer-sized Main Belt asteroid population revealed bySpitzer

Ryan

Mizuno

Shenoy

et al. 2015

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Aims. Multi-epoch Spitzer Space Telescope 24 μm data is utilized from the MIPSGAL and Taurus Legacy surveys to detect asteroids based on their relative motion. Methods. Infrared detections are matched to known asteroids and average diameters and albedos are derived using the near Earth asteroid thermal model (NEATM) for 1865 asteroids ranging in size from 0.2 to 169 km. A small subsample of these objects was also detected by IRAS or MSX and the single wavelength albedo and diameter fits derived from these data are within the uncertainties of the IRAS and/or MSX derived albedos and diameters and available occultation diameters, which demonstrates the robustness of our technique. Results. The mean geometric albedo of the small Main Belt asteroids in this sample is p V = 0.134 with a sample standard deviation of 0.106. The albedo distribution of this sample is far more diverse than the IRAS or MSX samples. The cumulative size-frequency distribution of asteroids in the Main Belt at small diameters is directly derived and a 3σ deviation from the fitted size-frequency distribution slope is found near 8 km. Completeness limits of the optical and infrared surveys are discussed.

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Neowise Studies of Spectrophotometrically Classified Asteroids: Preliminary Results

Cited by 228 publications

References 44 publications

Polarimetric survey of main-belt asteroids

Polarimetric survey of main-belt asteroids

Visible and near-infrared observations of asteroid 2012 DA₁₄during its closest approach of February 15, 2013

The kilometer-sized Main Belt asteroid population revealed bySpitzer

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Neowise Studies of Spectrophotometrically Classified Asteroids: Preliminary Results

Cited by 228 publications

References 44 publications

Polarimetric survey of main-belt asteroids

Polarimetric survey of main-belt asteroids

Visible and near-infrared observations of asteroid 2012 DA14during its closest approach of February 15, 2013

The kilometer-sized Main Belt asteroid population revealed bySpitzer

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Product

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Visible and near-infrared observations of asteroid 2012 DA₁₄during its closest approach of February 15, 2013