SSOS: A Moving-Object Image Search Tool for Asteroid Precovery

Gwyn, Stephen; Hill, Norman; Kavelaars, J. J.

doi:10.1086/666462

Cited by 91 publications

(59 citation statements)

References 16 publications

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“…html; Gwyn et al 2012), as well as the Catalina Sky Survey (CSS; Christensen et al 2016), for pre-discovery images of each comet in Table 1. Images are selected based on the predicted position and brightness of the comets (m 21 T < for NEO survey images following Jedicke et al 2015, pp.…”

Section: Methodology and Resultsmentioning

confidence: 99%

A Search of Reactivated Comets

2017

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Dormant or near-dormant short-period comets can unexpectedly regain the ability to eject dust. In many known cases, the resurrection is short-lived and lasts less than one orbit. However, it is possible that some resurrected comets can remain active in later perihelion passages. We search the archival images of various facilities to look for these "reactivated" comets. We identify two candidates, 297P/Beshore and 332P/Ikeya-Murakami, both of which were found to be inactive or weakly active in the previous orbit before their discovery. We derive a reactivation rate of 0.007 comet orbit 1 1 --, which implies that typical short-period comets only become temporarily dormant a few times or less. Smaller comets are prone to rotational instability and may undergo temporary dormancy more frequently. Next generation high-cadence surveys may find more reactivation events of these comets.

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Section: Methodology and Resultsmentioning

confidence: 99%

A Search of Reactivated Comets

2017

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“…Each of these images, as well as the corresponding calibration files and stellar PSF, were retrieved from the Canadian Astronomy Data Center 2 (Gwyn et al, 2012) or directly from the observatory's database. Data processing and Mistral deconvolution of these images were performed following the same method as for our SPHERE images.…”

Section: Disk-resolved Imagesmentioning

confidence: 99%

3D shape of asteroid (6) Hebe from VLT/SPHERE imaging: Implications for the origin of ordinary H chondrites

Marsset

Carry

Dumas

et al. 2017

A&A

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Context. The high-angular-resolution capability of the new-generation ground-based adaptive-optics camera SPHERE at ESO VLT allows us to assess, for the very first time, the cratering record of medium-sized (D∼100-200 km) asteroids from the ground, opening the prospect of a new era of investigation of the asteroid belt's collisional history. Aims. We investigate here the collisional history of asteroid (6) Hebe and challenge the idea that Hebe may be the parent body of ordinary H chondrites, the most common type of meteorites found on Earth (∼34% of the falls). Methods. We observed Hebe with SPHERE as part of the science verification of the instrument. Combined with earlier adaptiveoptics images and optical light curves, we model the spin and three-dimensional (3D) shape of Hebe and check the consistency of the derived model against available stellar occultations and thermal measurements. Results. Our 3D shape model fits the images with sub-pixel residuals and the light curves to 0.02 mag. The rotation period (7.274 47 h), spin (ECJ2000 λ,β of 343 • ,+47 • ), and volume-equivalent diameter (193 ± 6 km) are consistent with previous determinations and thermophysical modeling. Hebe's inferred density is 3.48 ± 0.64 g.cm −3 , in agreement with an intact interior based on its H-chondrite composition. Using the 3D shape model to derive the volume of the largest depression (likely impact crater), it appears that the latter is significantly smaller than the total volume of close-by S-type H-chondrite-like asteroid families. Conclusions. Our results imply that (6) Hebe is not the most likely source of H chondrites. Over the coming years, our team will collect similar high-precision shape measurements with VLT/SPHERE for ∼40 asteroids covering the main compositional classes, thus providing an unprecedented dataset to investigate the origin and collisional evolution of the asteroid belt.

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“…In addition, the object was serendipitously recorded on March 17, 2016, 14:53 UT, on the MegaCam detector (Boulade et al 2003) of the 3.6m CFHT, found using Solar System Object Image Search (SSOIS) (Gwyn et al 2012), in an image taken as part of the Outer Solar System Origins Survey (OSSOS) (Bannister et al 2016). Additional data from the Pan-STARRS telescope taken between 2016-03-04 and 2016-05-05 were used to refine the orbit of and locate P/2016 J1 in the CFHT SSOS database.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

The Splitting of Double-component Active Asteroid P/2016 J1 (PANSTARRS)

Moreno

Pozuelos

Novaković

et al. 2017

ApJL

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We present deep imaging observations, orbital dynamics, and dust tail model analyses of the double-component asteroid P/2016 J1 (J1-A and J1-B). The observations were acquired at the Gran Telescopio Canarias (GTC) and the CanadaFrance-Hawaii Telescope (CFHT) from mid March to late July, 2016. A statistical analysis of backward-in-time integrations of the orbits of a large sample of clone objects of P/2016 J1-A and J1-B shows that the minimum separation between them occurred most likely ∼2300 days prior to the current perihelion passage, i.e., during the previous orbit near perihelion. This closest approach was probably linked to a fragmentation event of their parent body. Monte Carlo dust tail models show that those two components became active simultaneously ∼250 days before the current perihelion, with comparable maximum loss rates of ∼0.7 kg s −1 and ∼0.5 kg s −1 , and total ejected masses of 8×10 6 kg and 6×10 6 kg for fragments J1-A and J1-B, respectively. In consequence, the fragmentation event and the present dust activity are unrelated. The simultaneous activation times -4 -of the two components and the fact that the activity lasted 6 to 9 months or longer, strongly indicate ice sublimation as the most likely mechanism involved in the dust emission process.

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SSOS: A Moving-Object Image Search Tool for Asteroid Precovery

Cited by 91 publications

References 16 publications

A Search of Reactivated Comets

A Search of Reactivated Comets

3D shape of asteroid (6) Hebe from VLT/SPHERE imaging: Implications for the origin of ordinary H chondrites

The Splitting of Double-component Active Asteroid P/2016 J1 (PANSTARRS)

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