[meteorite-list] A Sharper Look At Near Earth Asteroid 2002 NY40
From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Thu Apr 22 10:08:20 2004 Message-ID: <200209040524.WAA07774_at_zagami.jpl.nasa.gov> Isaac Newton Group of Telescopes Apartado de Correos, 321 E-38700 Santa Cruz de La Palma Canary Islands; SPAIN FOR FURTHER INFORMATION PLEASE CONTACT: Dr. Javier Licandro Isaac Newton Group of Telescopes Phone: +34 922 425 431 Fax: +34 922 425 401 E-mail: licandro_at_ing.iac.es Dr. Francisco Prada Isaac Newton Group of Telescopes Phone: +34 922 425 430 Fax: +34 922 425 401 E-mail: fprada_at_ing.iac.es Dr. Sebastian Els Isaac Newton Group of Telescopes Phone: +34 922 425 441 Fax: +34 922 425 401 E-mail: sels_at_ing.iac.es Mr. Javier Méndez Public Relations Officer Isaac Newton Group of Telescopes Phone: +34 922 425 464, 616 464 111 Fax: +34 922 425 442 E-mail: jma_at_ing.iac.es For immediate release: Wednesday 4 September 2002 Press Release ING 3/2002 A SHARPER LOOK AT NEAR EARTH ASTEROID 2002 NY40 The Near Earth Asteroid 2002 NY40 was observed with the William Herschel Telescope on La Palma, Canary Islands, on the night of August 17 to 18, 2002. The asteroid was imaged just before its closest approach to Earth, using the Adaptive Optics system NAOMI. These are the first images of a Near Earth Asteroid obtained with an Adaptive Optics system. During these observations the asteroid was 750,000 kilometres away, twice the distance to the Moon, and moving very rapidly across the sky (crossing a distance similar to the diameter of the Moon in 6 minutes or at 65,000 kilometres per hour). Despite the technical difficulties introduced by this, very high quality images were obtained in the near-infrared with a resolution of 0.11 arcseconds. This resolution is close to the theoretical limit of the telescope, and sets an upper limit to the size of the asteroid: only 400 metres across at the time of the observations. Measuring the size of asteroids helps astronomers understand their nature and formation history as well as the potential threat they pose. Near Earth Asteroids are a small population of asteroids that periodically approach or intersect the orbit of our planet, and have the possibility of colliding with the Earth as probably happened 65 million years ago, ending the dinosaur era. However, the probability that such an impact could happen is very low and in particular Near Earth Asteroid 2002 NY40 represents no danger to human live on Earth. Close encounters of large Near Earth Asteroids such as 2002 NY40 on August 18 happen approximately every 50 years. The last known case was NEA 2001 CU11 which passed just outside the Moon's orbit on August 31, 1925. Nobody saw that approach because that asteroid was not discovered until 77 years later. 2002 NY40 was discovered on July 14, 2002 by the LINEAR telescope in New Mexico (USA), providing a unique opportunity to obtain observations of the asteroid from the Earth during its flyby. Several observers have reported variations in the brightness of 2002 NY40, suggesting that it is highly elongated and tumbling. Further monitoring of these variations will tell us whether the asteroid was viewed end-on or side-on, and thus allowing the determination of the size and the shape more precisely. NAOMI is the WHT's Adaptive Optics system, built by a team from the University of Durham and the Astronomy Technology Centre, UK. It incorporates a system of fast-moving mirror elements which correct in real-time for the defocusing of stars caused by the Earth's turbulent atmosphere. In good conditions, NAOMI delivers images as sharp as those from Hubble Space Telescope. The Isaac Newton Group of Telescopes (ING) is an establishment of the Particle Physics and Astronomy Research Council (PPARC) of the United Kingdom, the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) of the Netherlands and the Instituto de Astrofísica de Canarias (IAC) in Spain. The ING operates the 4.2 metre William Herschel Telescope, the 2.5 metre Isaac Newton Telescope, and the 1.0 metre Jacobus Kapteyn Telescope. The telescopes are located in the Spanish Roque de Los Muchachos Observatory on La Palma which is operated by the Instituto de Astrofísica de Canarias (IAC). The ING NAOMI team consists of Dr. Chris Benn, Dr. Sebastian Els, Dr. Tom Gregory, Dr. Roy Østensen and Dr. Francisco Prada. FOR FURTHER INFORMATION ON THE WEB: More information on NAOMI: NAOMI home page, http://www.ing.iac.es/Astronomy/instruments/naomi/ More information on the Isaac Newton Group of Telescopes (ING): Public Information on ING, http://www.ing.iac.es/PR/ PICTURES AND MOVIES [Movie of 2002 NY40] Caption: Movie of asteroid 2002 NY40 on the night of August 17 to 18, 2002. Every frame of this movie is a 0.5 second exposure in H-band (1.63 microns). Stars are trailed because the telescope was tracking in the asteroid proper motion. Picture credit: The ING NAOMI team. Available formats: * Animated GIF 200x200 pixels (430 K) http://www.ing.iac.es/PR/press/2002NY40.gif * Animated GIF 400x400 pixels (2,977 K) http://www.ing.iac.es/PR/press/2002NY40_big.gif [2002 NY40] Caption: H-band (1.63 microns) image of asteroid 2002 NY40 taken on the night of August 17 to 18, 2002. Picture credit: The ING NAOMI team. Available formats: With describing text: * JPEG 400x400 pixels (133 K) http://www.ing.iac.es/PR/press/2002NY40.jpg * TIFF 15cmx15cm, 300dpi (4,640 K) http://www.ing.iac.es/PR/press/2002NY40.tif Without text: * JPEG 400x400 pixels (113 K) http://www.ing.iac.es/PR/press/2002NY40_sin.jpg * TIFF 15x15 cms, 300dpi (4,640 K) http://www.ing.iac.es/PR/press/2002NY40_sin.tif [NAOMI] Caption: The NAOMI Adaptive Optics system at the Nasmyth focus of the William Herschel Telescope. Picture credit: The NAOMI team. Available formats: * JPEG 1000x783 pixels (185 K) http://www.ing.iac.es/PR/press/naomi.jpg * TIFF 19.4x15.2 cms, 300dpi (12,492 K) http://www.ing.iac.es/PR/press/naomi.tif [WHT and the Milky Way] Caption: Composite picture showing the William Herschel Telescope (WHT) with the Milky Way in the background. The WHT is the most powerful optical/infrared telescope in Europe. Picture credit: Nik Szymanek and Ian King. Available formats: * JPEG 800x934 (170 K) http://www.ing.iac.es/PR/press/whtmway_s.jpg * TIFF 3643x4252 pixels, 400dpi (16 M) http://www.ing.iac.es/PR/archive/wht/whtmway.tif * TIFF 15.4x18.0 cms, 300dpi (11 M) http://www.ing.iac.es/PR/press/whtmway_s.tif Received on Wed 04 Sep 2002 01:24:02 AM PDT |
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