Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/NolantagR1824tp.pdf Дата изменения: Thu Apr 7 05:01:03 2005 Дата индексирования: Sat Dec 22 21:37:48 2007 Кодировка: Поисковые слова: весеннее равноденствие

Proposal Identification No.:

R1824

Date Received:

2005-May-31 17:16:20

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Urgent Planetary Radar Solar System 16 Hours

Radar Observations of Near-Earth Asteroid 2003 GY

Near-Earth asteroid 2003 GY approaches to within .042 AU of the Earth in August 2003. This 350-m "Potentially Hazardous" ob ject presents a high-resolution (15-m) imaging opp ortunity. 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 2003 GY was discovered by the NEAT asteroid search program on 5 April, 2003. 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 150 p er run, and obtain images at 15 m (or finer) resolution during its approach to 0.04 AU of the Earth in mid-August 2003. We will need several days of observation to obtain go o d rotational coverage. Imaging at 15m 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. The 2003 apparition is the b est opp ortunity to observe this ob ject for at least 50 years.

Name Michael C Nolan

Institution Arecibo Observatory

E-mail nolan@naic.edu

Phone 787 878 2612 x334

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