Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/HowelltagA2031tp.pdf Дата изменения: Tue Aug 15 18:09:05 2006 Дата индексирования: Sat Dec 22 22:29:45 2007 Кодировка: Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п

Proposal Identification No.:

A2031

Date Received: 2004 -Oct-04 15:24:54

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: Regular Astronomy Spectroscopy Solar System 50 Hours

OH Observations of Comets in 2005: Including Deep Impact Mission Target

9P/Tempel 1
ABSTRACT:
As part of a continuing effort to observe the 18-cm OH lines in comets we propose to observe 9P/Tempel 1 and C/2003 T4 LINEAR in spring 2005. These comets are moderately bright, and the predicted strength of the OH lines are easily detectable. Comet 9P/Tempel 1 is the target of the Deep Impact Mission. Unfortunately, the ob ject will not be in the declination range observable from Arecibo at the time of impact. However, it will be observable for about 3 months prior to that time, so that we can establish the baseline water production rate and monitor any variability prior to the impact. This will be very important in order to put the later observations into the proper context. The C/2003 T4 (LINEAR) predicted OH line strength are near the limit at which we can make spatial maps of the coma. We want to determine if collionsional quenching of the OH line in the coma can be detected for these low-productivity comets in order to understand discrepancies between the predictions and observations of the water production (Lovell et al. 2004). Since water makes up the bulk of a comet's mass, the mass loss rate inferred from the OH line flux strongly depends upon understanding the quenching mechanism and outflow kinematics.

Name Ellen S. Howell

Institution

E-mail ehowell@naic.edu

Phone 787 878-2612 x282

Student no

Service Observing Request

Remot e Observing Request

X

None All of the observing run. Part of the observing run. Queue Observing

X

No Maybe Yes

Instrument Setup
L-wide Atmospheric Observation Instruments: 1 ALFA


Sp ecial Equipment or setup: ALFA with the OH filters (1600-1750 MHz) would improve the scientific return for the Deep Impact Mission target, Comet 9P/Tempel1. However, if ALFA is unavailable in OH mode, we can use L-wide.

RFI Considerations Frequency Ranges Planned
1610 1665 1667 1720

2