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Proposal Identification No.:

A2606

Date Received:

2010-Oct-28 14:04:44

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Urgent Astronomy Spectroscopy Solar System 10 Hours

Backup Observations of Comet 103P/Hartley 2 of OH at 1667 MHz

Comet 103P/Hartley 2 is the target of the EPOXI spacecraft flyby on November 5, 2010. Arecibo radar has obtained position information, helpful to planning the imaging sequences, and orbital improvement. Radar images show an elongated bilobate nucleus. Radio OH observations help to determine the amount of water in the cometary coma, and is one of the few ways to measure water from the ground without atmospheric interference. The radar observations take precedence, but if the system has failures, the OH observations are a way to use the time productively and make important science contributions. The GBT has been monitoring the OH production of Hartley 2 under a joint program. We would like two simultaneous days of observations for cross calibration, since the GBT beam is much larger, and thus averages over a larger time period of the comet's variable activity. Other observers have seen jets and variable gas and dust jets, so measuring the water production on a daily basis will be an important baseline for comparing the other less abundant species in the coma.

Name Ellen Howell

Institution NAIC

E-mail ehowell@naic.edu

Phone

Student no

Remote Observing Request

Observer will travel to AO Remote Observing X In Absentia (instructions to operator)

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none 1


RFI Considerations Frequency Ranges Planned

2