Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2015Spring/CampbelltagR2956.pdf Дата изменения: Tue Sep 9 17:25:07 2014 Дата индексирования: Mon Apr 11 17:23:04 2016 Кодировка: Поисковые слова: arp 220

Proposal Identification No.:

R2956 Arecibo Observatory

Date Received: 2014-Sep-01 09:46:55 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: Sub-Category: Observation Category: Time Requested this 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 Radar Solar System 52 0 4 100-500 GB

Arecibo Radar Mapping of Venus During the 2015 Conjunction

We propose to acquire dual-polarization radar images of Venus during the 2015 conjunction. We will use the Arecibo S-band system for ten days near close approach, providing about 30 independent looks of the northern and southern hemispheres with 1-2 km spatial resolution . We also request about 12 hours of mid-day time leading up to the mapping to optimize the telescope pointing behavior. Our primary goals in collecting the new data are to study (1) crater deposits that mantle the highland tessera terrain, (2) the presence and distribution of fine-grained weathered material on the plains, (3) the surface properties of hotspot volcanoes (like Hathor, Ushas, and Innini Montes) that are thought to be sites of recent activity, and (4) the possibility of active volcanism over the time frame since the 1988 Arecibo maps. Outreach Abstract: The landscape of Venus is hidden from the view of optical cameras by a thick layer of clouds. We are using the Arecibo radar transmitter to "see" beneath the clouds and make maps of Venus with 1-2 km spatial resolution. These maps will be used with other types of information about our sister planet to study how the surface changes over time due to volcanic activity, meteorite impacts, and atmospheric weathering.

Name Bruce A Campbell Donald B Campbell

Institution Smithsonian Institution Cornell University

E-mail campbellb@si.edu campbell@astro.cornell.edu

Phone 202 633 2472 607 255 9580

Student no no

1


Additional Authors
Lynn Carter, lynn.m.carter@nasa.gov Michael Nolan, nolan@naic.edu Gareth Morgan, morganga@si.edu Jennifer Whitten, whittenj@si.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 not needed.

Begin ­ End Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) Times are dictated by the visibility of Venus during the period before and after close approach on August 15, 2015. We will work with the scheduler to choose 10 observing dates bracketing conjunction. About 4 total hours per day are required for transmitter setup and the actual observations. We also request about 12 hours of time in mid-day periods, prior to the mapping runs, to optimize the telescope pointing - this work will be coordinated with Observatory staff.

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

Atmospheric Observation Instruments:

2


Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned

Section V - Observing List Target List
Venus

3