Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2015Spring/HowelltagA2939.pdf Дата изменения: Tue Sep 9 17:24:45 2014 Дата индексирования: Mon Apr 11 16:44:11 2016 Кодировка: Поисковые слова: universe

Proposal Identification No.:

A2939 Arecibo Observatory

Date Received: 2014-Sep-05 00:22:10 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 Astronomy Spectroscopy Solar System 12.5

1 hour less than 100 GB

Cometary OH observations of C/2014 Q2 Lovejoy

Comet C/2014 Q2 Lovejoy is a long-period comet expected to be very bright and observable at Arecibo from January 2015. Mapping the 18-cm OH lines is an effective way to measure the water production rate and outflow velocity of gas in a cometary coma. The opportunities to study comets are rare, and every comet seems to behave differently. Understanding the mechanisms that govern the sublimation on cometary nuclei requires as many observations of comets with different origins as possible to uncover trends. We have studied 26 comets in the last 15 years, but see a great deal of variation, and deviations from predicted behaviors. Outreach Abstract: Comets are mostly made of water ice, but water in the Earth's atmoshphere makes it hard to study water from the ground. Radio wavelengths are an exception, and we can study water in comets through rain, clouds, in daytime as well as night. Comets can suddenly become bright unexpectedly, and change rapidly, so many observations are needed to help understand them. We measure how fast the gas leaves the comet surface, and the total amount of water produced. This helps to understand the composition of these ob jects, which might have helped bring water to the early Earth.

Name Ellen S Howell Amy Lovell

Institution Agnes Scott College

E-mail ehowell@naic.edu alovell@agnesscott.edu

Phone Student 17878782612282 no no

This work is not part of a thesis.

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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) Comet is observable Jan 10-30. See proposal for detailed ephemeris.

Section I I I - Instruments Needed
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1665-1667 MHz

Section V - Observing List

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Target List
See proposal 2015-Jan-10 2015-Jan-20 2015-Jan-30 for details. 00:00 04 03 43.38 +02 13 30.7 00:00 03 06 38.67 +23 46 32.6 00:00 02 26 42.05 +37 06 38.3

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