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	4769 Castalia - Wikipedia, the free encyclopedia
		The asteroid 4769 Castalia (previously known by the provisional designation 1989 PB) was the first asteroid to be directly imaged.
		Castalia's orbit took it within eleven lunar distances of Earth, allowing it to be scanned with radar from the Arecibo Observatory by Scott Hudson (Washington State University) and Steven J. Ostro (JPL).
		Castalia was found to have a peanut shape, suggesting two 800 m diameter pieces held together by their weak mutual gravity.
	en.wikipedia.org /wiki/4769_Castalia (210 words)

	Asteroid Castalia
		Asteroid 4769 Castalia is a near-Earth crossing asteroid that was discovered by Eleanor F. Helin (Caltech) on August 9, 1989.
		This image is a shaded relief map of asteroid 4769 Castalia, previously known as 1989 PB.
		This is a shaded relief map of asteroid 4769 Castalia, previously known as 1989 PB.
	www.solarviews.com /eng/castalia.htm (391 words)

	Castalia - Wikipedia, the free encyclopedia
		Castalia, in Greek and Roman mythology was a nymph whom Apollo transformed into a fountain at Delphi, at the base of Mt. Parnassos, or at Mt Helicon.
		Castalia could inspire the genius of poetry to those who drank her waters or listened to their quiet sound; the sacred water was also used to clean the Delphian temples.
		Apollo consecrated Castalia to the Muses (Castaliae Musae).
	en.wikipedia.org /wiki/Castalia (123 words)

	castalia (Site not responding. Last check: 2007-11-07)
		Castalia, in Greek and Roman mythology was a nymph that Apollo transformed into a fountain at Delphi, at the base of Mt. Parnassos, or at Mt Helicon.
		Castalia could inspire the genius of poetry to those who would drink her waters or just listen at their quiet sound; the sacred water was also used to clean the Delphian temples.
		Castalia is also the name of an asteroid: see 4769 Castalia
	www.yourencyclopedia.net /Castalia.html (149 words)

	Asteroid 4769 Castalia (Site not responding. Last check: 2007-11-07)
		Castalia Branch Library A subdivision of the Sandusky Library, provides location and operating hours.
		Castalia Local News: Topix.net Local, regional, and statewide news collected from diverse sources on the web.
		Editorial Castalia Editorial Castalia lleva desde 1946 se dedica a la edición y venta de obras clásicas de la Literatura Castellana e Hispanoamericana.
	www.serebella.com /encyclopedia/article-Asteroid_4769_Castalia.html (303 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		CYLINDRICAL RELIEF MAP OF ASTEROID 4769 CASTALIA Castal2.gif is a shaded relief map of asteroid 4769 Castalia, previously known as 1989 PB.
		Castalia was discovered by E. Helin on 9 August 1989, and imaged at very low resolution by delay-doppler radar at Goldstone and Arecibo later in August 1989.
		A spherical harmonic model of the shape of Castalia was derived from the radar images and is described in: Hudson, R.S. and Ostro, S.J., 1994.
	publish.uwo.ca /~pjstooke/castal2.txt (390 words)

	4769 Castalia
		Asteroid 4769 Castalia is a near-Earth asteroid that was discovered by Eleanor F. Helin on August 9, 1989.
		Castalia was sacred to the muses and was considered a divine source of poetic inspiration.
		Castalia has a peanut shape and is about 1.8 kilometers across at its widest.
	www.geocities.com /zlipanov/selected_asteroids/4769_castalia/4769_castalia.html (334 words)

	Castalia in Greek Greek and Roman Roman mythology mythology was... (Site not responding. Last check: 2007-11-07)
		Castalia in Greek Greek and Roman Roman mythology mythology was...
		"Castalia", in Greek Greek and Roman Roman mythology mythology was a nymph nymph that Apollo Apollo transformed into a fountain at Delphi Delphi, at the base of Mt. Parnassos Parnassos, or at Mt Helicon Helicon.
		Castalia could inspire the genius of poetry poetry to those who would drink her waters or just listen at their quiet sound; the sacred water was also used to clean the Delphian temples.
	www.biodatabase.de /Castalia (144 words)

	4769 Castalia (Site not responding. Last check: 2007-11-07)
		The obtained data allowed astronomer s to produce a three-dimensional computer model of it.
		Margaretta Township Fire Department A department that provides fire, rescue and EMS services to the residents of Margaretta Township and the Village of Castalia.
		Castalia Web Solutions Castalia provides designing services, development of multilingual sites, e-commerce solutions, sites hosting, online databases, sites programming, Arabization and localization services.
	www.serebella.com /encyclopedia/article-4769_Castalia.html (349 words)

	Castalia (minor planet 4769)
		An Earth-crossing and potentially hazardous asteroid that is a member of the Apollo group, discovered by Eleanor Helin (Caltech) and colleagues.
		Castalia became the first asteroid for which astronomers were able to generate an image.
		This suggests that Castalia consists of two 800-m pieces resting together: the first known contact-binary object in the solar system.
	www.daviddarling.info /encyclopedia/C/Castalia.html (205 words)

	4769 Castalia (Site not responding. Last check: 2007-11-07)
		It is named after Castalia, a nymphin Greek mythology.
		Castalia's orbit took it within 11 lunar distances of Earth, allowing it to be scanned with radar from the Arecibo Observatory by Scott Hudson (Washington StateUniversity) and Steven J. Ostro (JPL).
		Castalia was found to have a peanut shape, suggesting two 800 m diameter pieces held together by their weak mutual gravity.Since then radar measurements of other asteroids has indicated that this contact binary arrangement appears to be common.
	www.therfcc.org /4769-castalia-19627.html (159 words)

	Asteroid 4769 Castalia
		When 1989 PB's orbit was considered secure, the asteroid was numbered 4769 and named Castalia.
		Aspects of this technique and the results of applying his inversion to Castalia (Hudson and Ostro 1994) and other asteroids are on his web page.
		Radar-derived shape models of asteroids open the door to a wide variety of theoretical investigations that previously have been impossible or have used simplistic models (spheres or ellipsoids).
	echo.jpl.nasa.gov /asteroids/4769_Castalia/cast03.html (414 words)

	Castalia (Site not responding. Last check: 2007-11-07)
		Asteroid 4769, Castalia, is a little over one mile long.
		Castalia's next close approach to Earth will occur on August 26, 2046.
		Castalia has the shape of two lobes that have been fused together.
	analyzer.depaul.edu /see_project/orbits/catalia.htm (83 words)

	CASTALIA (ASTEROID) (Site not responding. Last check: 2007-11-07)
		(4769) Castalia ist ein erdnaher Asteroid (Near Earth Object oder NEO), der am 9.
		Castalia bewegt sich in einer Entfernung von 0,5495 AU (Perihel) bis 1,577 AU (Aphel) in etwa 400 Tagen um die Sonne.
		Im August 1989 zog Castalia in elffachem Mondabstand an der Erde vorbei und konnte mittels Radar beobachtet werden.
	www.toonorama.com /encyclopedia/C/Castalia_(Asteroid) (147 words)

	4769 Castalia - Definition up Erdmond.Com (Site not responding. Last check: 2007-11-07)
		History Discoverer Eleanor_F._Helin, 1989 The asteroid 4769 Castalia (previous known only by the provisional_designation 1989 PB) was the first asteroid to be directly imaged.
		It was discovered on August_9, 1989 by Eleanor_F._Helin (Caltech) on photographic plates taken on Palomar_Observatory.
		Castalia's orbit took it within 11 lunar distances of Earth, allowing it to be scanned with radar from the Arecibo_Observatory by Scott_Hudson (Washington_State_University) and Steven_J._Ostro (JPL).
	www.erdmond.com /4769_Castalia.html (201 words)

	Arecibo Radar Astronomy
		Figure 3: The close approach to the Earth in 1989 of the newly-discovered, small asteroid 1989 PB (now named 4769 Castalia) provided the first good imaging opportunity for the Arecibo 12.6-cm wavelength radar of a small body.
		While there were hints from measurements of the spectra of reflected radar signals that some asteroids have a bifurcated shape, it was still a surprise that the radar images revealed 1989 PB to consist of two distinct kilometer-sized pieces that appear to be in contact and rotating about a common axis.
		to obtain the bifurcated shape of the small Earth-approaching asteroid 4769 Castalia (1989 PB), will not provide unambiguous images of the surface at the 10 to 20-m resolution capability of the system.
	www.naic.edu /~nolan/radar/AUSAC.html (5020 words)

	Castalia %28asteroid%29 (Site not responding. Last check: 2007-11-07)
		Editorial Castalia lleva desde 1946 se dedica a la edición y venta de obras clásicas de la Literatura Castellana e Hispanoamericana.
		Castalia provides designing services, development of multilingual sites, e-commerce solutions, sites hosting, online databases, sites programming, Arabization and localization services.
		Castalia, OH based volunteer wildlife rehabilitation and nature education center.
	www.omniknow.com /common/wiki.php?in=en&term=Castalia_%28asteroid%29 (644 words)

	asteroid 4769 Castalia (Site not responding. Last check: 2007-11-07)
		4769 Castalia is a near-Earth asteroid discovered 9 Aug. 1989 by Eleanor Helin at Palomar Observatory.
		Later that same month the Arecibo and Goldstone radio telescopes were mobilized to perform radar observations as this object, originally designated 1989 PB, passed Earth at about 11 lunar distances.
		It was found to have a shape that indicate it may be a "contact binary" where two objects are nestled against each other.
	www.hohmanntransfer.com /cgi-bin/get.cgi?num=4769 (269 words)

	castalia - OneLook Dictionary Search
		Castalia : Columbia Encyclopedia, Six Edition [home, info]
		Castalia : Columbia Gazetteer of North America [home, info]
		Phrases that include castalia: 4769 castalia, asteroid 4769 castalia, asteroid castalia
	www.onelook.com /?w=castalia (108 words)

	Radar Imaging of Near Earth Asteroids
		One of the more spectacular NEO results of recent years has been a sequence of delay-Doppler images of 4769 Castalia (1989 PB) shown in Fig.
		Least-squares estimation of Castalia's three-dimensional shape from the radar images supports the hypothesis that Castalia is a contact-binary asteroid formed from the gentle collision of the two lobes and also constrains the object's surface morphology and pole direction.
		Figure 3.4: Radar images of asteroid 4769 Castalia (1989PB).
	www.ras.ucalgary.ca /SKA/science/node25.html (693 words)

	Numerical Simulations of Asteroid Collisions
		The target body used in this simulation was shaped to resemble the exterior of Earth-crossing asteroid 4769 Castalia, with dimensions of 1.6 km by 0.8 km (Hudson and Ostro 1995).
		The target was shaped to look like asteroid 4769 Castalia.
		The impact speed, squared, times the mass of the impactor equals the impact energy: 17 kilotons, the same as the Hiroshima explosion.
	www.boulder.swri.edu /~bottke/rubble/node4.html (545 words)

	Learn more about 4769 Castalia in the online encyclopedia. (Site not responding. Last check: 2007-11-07)
		Learn more about 4769 Castalia in the online encyclopedia.
		You are here: Online Encyclopedia > 4769 Castalia
		Hint: Play with putting spaces before and after your words to see the different results you get.
	www.onlineencyclopedia.org /4/47/4769_castalia.html (174 words)

	[64.06] High Resolution 3D Simulations of the Impacts of Asteroids into the Venusian Atmosphere (Site not responding. Last check: 2007-11-07)
		We consider impacts both by spheres and by the real asteroid 4769 Castalia, a severely nonspherical body in a Venus-crossing orbit.
		We compute mass and momentum fluxes as functions of altitude as global measures of the asteroid's progress.
		A one-parameter modified pancake model reproduces the crater-forming potential of the 3D Castalias quite well.
	www.aas.org /publications/baas/v32n3/dps2000/95.htm (348 words)

	[No title]
		For the non-principal axis rotator Toutatis, we list the ratio of the long to the intermediate axis from its shape model.
		For objects described in more than one paper, the most recent estimate of the elongation is cited (e.g., Castalia and Geographos).
		2001 4769 Castalia 1.6 3-D model Hudson and Ostro 1994 1685 Toro 1.5 ellipsoid fit Ostro et al.
	echo.jpl.nasa.gov /~lance/nea_elongations.html (790 words)

	SPACE.com -- Astronomers Report On Strange Double Asteroid
		In 1989, Jet Propulsion Laboratory asteroid tracker Eleanor Helin discovered a similar binary system called 4769 Castalia, in which the two pieces are stuck together by gravity as if kissing.
		Brian Marsden, who puts out the Central Bureau for Astronomical Telegrams and is director of the Minor Planet Center in Cambridge, Mass., said the European group's report was credible enough to publish in the circular but ideally should be confirmed.
		He questioned the idea that the objects are separated by any space at all, in which case they might be classified as a "contact binary" like Castalia rather than a "near-contact binary," as Hestroffer suggested.
	www.space.com /science/astronomy/double_asteroid_991118.html (829 words)

	Binary Asteroid abstract (Site not responding. Last check: 2007-11-07)
		We propose that some fast rotating rubble-pile asteroids (e.g.
		4769 Castalia), after experiencing a close approach with a planet, undergo tidal breakup and split into multiple co-orbiting fragments.
		In some cases these fragments evolve into stable binary systems, which re-encounter and impact the planet during a later pass, creating two distinct craters.
	www.boulder.swri.edu /~bottke/Abstracts/binary_abs.html (357 words)

	Access: The Asteroid Diaries
		Once they understand what happens as asteroids come in, they will be able to calculate how many years of hits are really represented by the crater record on Venus.
		Instead, he recruited Mac Low, a scientist with the American Museum of Natural History in New York, who crafted a software strategy for capturing on computer the detailed physics of atmospheric impacts.
		Zahnle also enlisted Korycansky, who built into the software a radar-imaged likeness of a real asteroid known as 4769 Castalia, which periodically crosses Venus' orbit.
	access.ncsa.uiuc.edu /Stories/impacts (399 words)

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