Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2014Spring/HowelltagR2867.pdf Дата изменения: Fri Sep 6 19:44:32 2013 Дата индексирования: Sat Mar 1 01:02:09 2014 Кодировка: Поисковые слова: mercury surface

Proposal Identification No.:

R2867 Arecibo Observatory

Date Received: 2013-Sep-02 12:49:27 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2013. 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: ABSTRACT: The NASA support for the planetary radar program at Arecibo Observatory has just been augmented from 500 hours/year to 800 hours/year. The hours devoted to near-Earth asteroids (NEAs) has been increased from at least 300 hours to at least 500 hours. This proposal covers the time request for the second-best imaging opportunities, radar astrometry, and systematic survey time. Radar characterization of NEAs is valuable, even at the lower signal-to-noise levels that precludes high-resolution imaging. Overall shape determination, astrometry to improve the orbit solution, and regular surveys to observe new ob jects and targets of opportunity all yield valuable scientific results. Outreach Abstract: Near-Earth asteroids are interesting for a variety of reasons. They are left-over material from the formation of the planets, and tell us about the early Solar System conditions. They are the most accessible spacecraft mission targets in terms of fuel, and may be a valuable resource for human activity in space. These bodies also represent an impact hazard to the Earth, although if their orbits are known with sufficient accuracy, we can predict and possibly even prevent a future impact, if we have enough warning. Radar observations can determine orbits with superb accuracy, so we make every effort to observe all potentially hazardous asteroids within our reach. We also are characterizing as many as possible to evaluate future mission targets, and potential resources. With the 300 hours of telescope requested here, we expect to observe about 100 near-Earth asteroid in the coming year. Large Planetary Radar Solar System 150 150 374 last year 500 hrs/yr 4.0 hours less than 100 GB

Radar Characterization of NEAs: Using Moderate Resolution Imaging, Astrometry, and a Systematic Survey

Name Ellen S Howell Michael C Nolan

Institution Arecibo Observatory Arecibo Observatory

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

Phone 787 878-2612 x282 787 878-2612 x334

Student no no

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Additional Authors
Patrick Taylor ptaylor@naic.edu Alessondra Springmann sondy@naic.edu Jon D. Giorgini JPL, Pasadena, CA jdg@tycho.jpl.nasa.gov

This work is not part of a 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 AST. For these observations night-time is .

Begin ­ End Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) See proposal for time request. We request one 8-hour night per month for a regular survey. 20:00-4:00 AST, preferably 4-5 days after new moon.

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) See proposal text for time request and justification.

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
2380

Section V - Observing List Target List
See proposal for target lists and priorities.

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