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Proposal Identification No.:

A2755

Date Received:

2012-Sep-04 23:30:28

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Solar System 54 Hours 2 hours

Radio Spectroscopy of three comets March-May 2013

We propose to observe OH in three comets March-May 2013. C/2011 L4 Panstarrs, C/2012 L2 LINEAR and C/2012 F6 Lemmon are observable from Arecibo, and we plan to measure the water production rate and outflow velocity using the OH line at 1667 MHz. Comets can change rapidly with time, so monitoring the water production is important to understand individual comets, and to detect trends that might allow us to distinguish comets that formed in the Kuiper belt from those that formed in the Jupiter or Saturn region. C/2011 L4 Panstarrs will be very bright and close to the sun, so we plan to also try to detect formaldehyde and other molecular lines at higher frequencies.

Name Ellen Howell

Institution Arecibo Observatory

E-mail ehowell@naic.edu

Phone 787 878-2612 x282

Student no

Remote Observing Request

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

Instrument Setup
L-wide C

Atmospheric Observation Instruments:

Sp ecial Equipment or setup: We need L-wide for OH. For Comet Panstarrs a few days will be spent looking for other molecular lines with C-band near 5 GHz.

RFI Considerations
1


Frequency Ranges Planned
1667 5000

2