Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/NolantagR2097tp.pdf Дата изменения: Mon May 9 19:58:50 2005 Дата индексирования: Sat Dec 22 21:39:06 2007 Кодировка: Поисковые слова: роберт годдард

Proposal Identification No.:

R2097

Date Received:

2005-May-04 11:33:32

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Urgent Planetary Radar Solar System 12 Hours

Radar Observations of asteroids 2005 ED318

Near-Earth asteroid 2005 ED318 approaches to within .016 AU of the Earth in May 2005. This 350-m "Potentially Hazardous" ob ject presents a high-resolution (7.5-m) imaging opp ortunity (the highest SNR opp ortunity this year). Ob jects in this size range are near the "strength-gravity transition", which is critical to our understanding of meteorite delivery and asteroid hazard mitigation, and we need to use every opp ortunity to image these targets. Radar imaging can help determine the internal structure by giving us information ab out the size, spin rate and even density in the case of binary systems. Asteroid 2005 ED318 was discovered by the LONEOS asteroid search program, but its orbit was initially uncertain, so we delayed prop osing until we were sure of its p osition. Nothing is known ab out the physical prop erties of this ob ject other than its absolute magnitude of 20, which suggests that its diameter is within a factor of two of 350 m. Conservatively assuming a rotation p erio d of 2 h, we should b e able to obtain S/N of ab out 10000 p er run at closest approach, and obtain images at 7.5 m resolution during its approach to 0.016 AU of the Earth in May 2005. We will need several days of observation to obtain go o d rotational coverage. Imaging at 7.5m resolution will allow go o d determination of the overall shap e of the ob ject, and will resolve large surface features. It will also allow detection of satellites, if any exist.

Name Michael C Nolan

Institution Arecibo Observatory

E-mail nolan@naic.edu

Phone

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
S-Band radar S-band receiver

Atmospheric Observation Instruments:

1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned

2