Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2015Spring/TaylortagR2960.pdf Дата изменения: Tue Sep 9 17:25:10 2014 Дата индексирования: Mon Apr 11 16:43:54 2016 Кодировка: Поисковые слова: trees

Proposal Identification No.:

R2960 Arecibo Observatory

Date Received: 2014-Sep-01 17:42:53 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2014. This proposal has not been submitted before. Proposal Type: General Category: Observation Category: Time Requested this semester: Hours Next Semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: Regular Planetary Radar Solar System 144 144

2.0 less than 100 GB

Arecibo Radar Observations of 17 High-Priority Near-Earth Asteroids During

CY2015
ABSTRACT: We request 60 sessions over calendar year 2015 totaling 288 hours of telescope time (observing + transmitter-warmup time) to observe our 17 highest-priority near-Earth asteroids. Only one of these has been previously resolved in radar images. The other 16 ob jects provide an important discovery space as they are currently poorly characterized. Our goals include detailed physical characterization including constraining size, shape, spin state, surface properties, near-surface roughness, and reflectivity, as well as determination of binarity or multiplicity, orbital refinement, and three-dimensional shape modeling when possible. Outreach Abstract: We will use the Arecibo planetary radar system to send a signal to nearby asteroids and analyze the signal that bounces back to us. How the signal changes helps us determine the properties of the asteroid's surface, how big the asteroid is, how it is shaped, and how it spins. Radar also helps us determine the orbit of the asteroid around the Sun and whether the asteroid poses any threat to Earth in the future.

Name Patrick A Taylor Michael C Nolan

Institution Arecibo Observatory Arecibo Observatory

E-mail ptaylor@naic.edu nolan@naic.edu

Phone 787-878-2612 x358 787-878-2612 x334

Student no no

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Additional Authors
Ellen S. Howell (ehowell@naic.edu) James E. Richardson (richardson@naic.edu) Edgard G. Rivera-Valentin (eriverav@naic.edu) Linda A. Ford (lford@naic.edu) Luisa F. Zambrano-Marin (lzambrano@naic.edu) Jon D. Giorgini (jdg@tycho.jpl.nasa.gov) Lance A. M. Benner (lance.benner@jpl.nasa.gov) Marina Brozovic (marina.brozovic@jpl.nasa.gov) Jean-Luc Margot (jeanlucmargot@gmail.com) Shantanu P. Naidu (spn@ucla.edu) Michael W. Busch (michael.william.busch@gmail.com) Michael K. Shepard (mshepard@bloomu.edu) Christopher Magri (magri@maine.edu) Sean Marshall (sem299@cornell.edu) - Graduate student Oliver Bowman - Graduate student

This work is part of a PhD thesis.

Remote Observing Request

X

Observer will travel to AO Remote Observing In Absentia (instructions to operator)

Section I I - Time Request
The following times are in UT. For these observations night-time is not needed.

Begin ­ End Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) Targets are moving. Proposal will include dates and times requested and ephemerides will be provided for observations.

Next Semester Time Request

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Begin ­ End Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) Targets are moving. Proposal will include dates and times requested and ephemerides will be provided for observations.

Section I I I - Instruments Needed
S-Band radar S-band receiver

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned

Section V - Observing List Target List
Our targets are moving, so a target list with RA, Dec, and rise-set times as a function of time is included in the proposal and higher-precision ephemerides will be provided at the time of observations.

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