Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2013Spring/ShepardtagR2795.pdf Дата изменения: Tue Sep 11 04:14:23 2012 Дата индексирования: Mon Feb 4 23:31:43 2013 Кодировка: Поисковые слова: arp 220

Proposal Identification No.:

R2795 Arecibo Observatory

Date Received: 2012-Aug-31 15:40:12 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2012. 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: Regular Planetary Radar 13 38.75 0 0 2 hrs less than 100 GB

Radar Investigation of Five X M E-class Asteroids

We propose to observe five X M E-class asteroids to better understand their properties. Because M-class asteroids are purportedly metal-rich, radar is the best tool with which to test this compositional hypothesis. E-class asteroids are unique in that they have extremely high radar polarization ratios, an observation that remains unexplained. These observations continue our six year survey of all the M- and E-class asteroid observable at Arecibo. Two of these ob jects (161 Athor, 572 Rebekka, both M-class) have never been observed by radar. 216 Kleopatra (M-class) will have SNRs high enough for delay-Doppler imaging and allow us to refine that unusual target's shape and spin properties. Our observations will help us understand the origin of metal-asteroids and aubrites (E-class analogs) in the main-asteroid belt and add to our understanding of the early solar system' s formation and subsequent evolution. Outreach Abstract: The M-class asteroids are thought to be metal rich. They may be the cores of ancient planetesimals, and could provide a wealth of resources for future use. Radar is the best tool for identifying which asteroids are dominantly metal and which are dominantly rocky. We propose to study these enigmatic ob jects at Arecibo. This will help us understand their origin, the evolution of the solar system, and provide a data base for future exploration efforts. Los asteroides de clase M se cree que son ricas en metales. Ellos pueden ser los nucleos de antiguos planetesimales, y podrґ a proporcionar una gran cantidad de recursos i para su uso futuro. El radar es la mejor herramienta para la identificacion de los asteroides son predominantemente de metal y que son predominantemente rocoso. Nos proponemos estudiar estos ob jetos enigmaticos en Arecibo. Esto nos ayudara a comprender su origen, la evolucion del sistema solar, y proporcionar una base de datos para futuros esfuerzos de exploracion.

Name Michael K Shepard Michael Nolan

Institution Arecibo Observatory

E-mail mshepard@bloomu.edu nolan@naic.edu 1

Phone 5703894568 787-878-2612

Student no no


Additional Authors
Christopher Magri University of Maine, Farmington magri at maine.edu

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 required.

Begin ­ End Interval­Interval 2245 ­ 0200 ­ ­ ­

Days Needed at This Interval 4

Time Constraints (Must Be Justified in the Prop osal Text) Asteroid target is at opposition and SNR is maximized. Number of days requested allows full 360 degree rotational coverage given its known rotational rate.

Next Semester Time Request

Begin ­ End Interval­Interval 2200 ­ 0245 2215 ­ 0200 ­ ­ 2

Days Needed at This Interval 5 4


Time Constraints (Must Be Justified in the Prop osal Text) Asteroid targets are at opposition and SNR is maximized. Number of days for each target allows full 360 degree rotational coverage and sufficient time to address each target where multiples are visible within the same time window.

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
List is in proposal 785 Zwetana 216 Kleopatra 161 Athor 572 Rebekka 64 Angelina

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