Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/BrozovictagR2893tp.pdf Дата изменения: Fri Jan 31 22:50:12 2014 Дата индексирования: Mon Apr 11 17:10:18 2016 Кодировка: Поисковые слова: asteroid

Proposal Identification No.:

R2893

Date Received:

2014-Jan-30 16:10:31

Technical Page
This proposal has not been submitted before. Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Urgent Planetary Radar Solar System 29 hours Hours 45 min

Urgent Proposal for S-band Radar Observations of Near-Earth Asteroid 2013

UQ4
ABSTRACT:
2013 UQ4 is a very unusual Near Earth Asteroid that has a comet-like orbit that takes it beyond the Kuiper belt. 2013 UQ4 appears to be optically dark with a 4% optical albedo that is consistent with a cometary origin. When combined with its absolute magnitude of 12.8, the albedo implies a diameter of 18 km. 2013 UQ4 will be a unique ob ject among the 422 near-Earth asteroids and 16 comets detected by radar. The last ob ject in the near-Earth population this large was discovered in 1983 (3552 Don Quixote). The closest approach for 2013 UQ4 will occur on July 10 at 0.314 AU (122 lunar distances). We propose to observe 2013 UQ4 with Arecibo's S-band radar, which will allow us to look for evidence of cometary activity as well as obtain some coarse (1.2 km resolution) delay-Doppler images of the ob ject. This resolution could reveal the ob ject' s shape, elongation, and any large-scale concavities if they are present. Radar astrometry will significantly reduce the orbital uncertainties.

Name Marina Brozovic

Institution Jet Propulsion Laboratory/Caltech

E-mail marina.brozovic@jpl.nasa.gov

Phone 1-818-354-5197

Student no

Remote Observing Request

X

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

Instrument Setup
S-Band radar S-band receiver

Atmospheric Observation Instruments:

1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned

2