Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/BrozovictagR2661tp.pdf Дата изменения: Mon Aug 15 18:16:51 2011 Дата индексирования: Mon Feb 4 23:24:43 2013 Кодировка: Поисковые слова: asteroid

Proposal Identification No.:

R2661

Date Received:

2011-Aug-08 17:02:08

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Urgent Planetary Radar 24 Hours 45 minutes

Urgent proposal for S-band radar imaging of Near-Earth Asteroid 2011 LC19

This is an urgent proposal requesting ~ hours of observing time during October and November 2011 for newly 24 discovered potentially hazardous asteroid (PHA) 2011 LC19. The physical characteristics of this ob ject are unknown, except that it has an absolute magnitude of 18.4 and an orbit that closely resembles those of the Jupiter-family comets, raising the question of whether this ob ject might be an inactive comet nucleus. In our radar sample of 273 radar-detected NEAs, there are only ten with T <3.0, the classical threshold to distinguish asteroids from comets. 2011 LC19 has the second lowest Tisserand parameter of any NEA we have ever tried to observe with radar. We assumed that 2011 LC19 has an optical albedo of ~ which, given its absolute magnitude, corresponds 5%, to a diameter of ~ km. We estimate that delay-Doppler images with 7.5 m resolution will put more than 1000 1.2 pixels on this ob ject. The resulting dataset will be used to reconstruct the asteroid' s 3D shape.

Name Marina Brozovic

Institution JPL

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

Phone 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 Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned

2