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Topic: Petr Pravec

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	Ondrejov Asteroid Photometry Project (Site not responding. Last check: 2007-10-21)
		This composite lightcurve of binary NEA 65803 Didymos (reprinted from Pravec et al., 2005, Photometric Survey of Binary Near-Earth Asteroids; see the note below) is an example of data resulted from the Photometric Survey for Asynchronous Binary Asteroids run from the Ondrejov Observatory and other collaborating stations (see the link above).
		It was also supported by the Grant Agency of the Academy of Sciences of the Czech Republic, Grant A3003204 during 2001-2004, by Space Frontier Foundation within The Watch program in 1999, and by other funding agencies.
		Pravec and Harris, Binary population among NEAs and beyond, here.
	www.asu.cas.cz /~ppravec/neo.html (2125 words)

	Asteroid Data Sets
		This data set includes a summary table of the characteristics of known binary near-Earth asteroids, compiled by Petr Pravec and Petr Scheirich.
		A list of references to the original observations is also included.
		"Pravec, P. and Scheirich, P., Eds., Binary NEAs Summary.
	www.psi.edu /pds/resource/binsum.html (51 words)

	Petr Pravec (Site not responding. Last check: 2007-10-21)
		From Petr Pravec (1999 July 16): "I have looked briefly at Lenka's and as your From Petr Pravec (1999 July km in diameter the object is 5 23): "If Yura...
		Petr dob se Petr Pravec a jeho tým zamuje spíe 1997 SE2 objevil objevy nových...
		Astronomical Institute in Ondrejov, Petr Pravec of the At the meeting, the Czech Republic, and Alan W. Harris...
	petrwgzh.obeleriocdgj.fejipoqoreyu.info (561 words)

	Tumbling Stone 23 - Special Issue - Petr Pravec and Alan Harris
		Pravec: Reading a report on the recovery of Hermes in MPEC 2003-T74 on October 15, several observers realized that it was a very favorable photometric target and they began to plan their observations, including my group in Ondrejov.
		Pravec: A lightcurve is a time series of measurements of brightness of an asteroid.
		We have observed it in the past three years 2001-2003 from Ondrejov as well as from a few other stations, including the European Southern Observatory (those observations have been led by Alan Fitzsimmons) and we hope to obtain enough data for the YORP detection in Summer 2004 when the asteroid returns again.
	spaceguard.esa.int /tumblingstone/issues/num23/eng/pravec.html (1659 words)

	CALL Homepage
		The layout of the basic tables has changed considerably.
		In addition, several new tables are available including a set of tables on binary asteroids produced by Petr Pravec and Alan Harris.
		Click here to download the file from CALL site
	www.minorplanetobserver.com /astlc (820 words)

	1998 WT24
		Petr Pravec requested observations from other observers of this near earth asteroid as it passed close by us on December 17, 2001.
		This was such a fast moving object that the asteroid moved through over 15 fields during the 500 images.
		The light curve plotted supported Petr's earlier period determination.
	btboar.tripod.com /lightcurves/id14.html (83 words)

	CCD Photometry of Comets
		Petr Pravec recommends starting observations (keeping a computer for the camera control in a room rather than in the telescope dome) by trying a lot of easy targets such as galaxies.
		Pravec warns that the observer should use a good and consistent procedure of centroiding point-source images (stars) and extended sources with condensations (not necessarily radially symmetric), and understand the gnomonic projection fitted to the reference stars, with regard to their distribution in the field.
		Pravec advsises that only for bright comets at smaller heliocentric distances (perhaps 1.0-1.5 AU), which can exhibit significant emission features, should the use of V filters be preferred and the clear-filter observations avoided.
	cfa-www.harvard.edu /icq/CCDmags.html (7641 words)

	Data sources for asteroids with satellites pages
		P00a: Pravec, Petr, Sarounová, Lenka, Rabinowitz, David L., Hicks, Michael D., Wolf, Marek, Krugly, Yurij N., Velichko, Fiodor P., Shevchenko, Vasilij G., Chiorny, Vasilij G., Gaftonyuk, Ninel M., & Genevier, Guy, 2000, Two-Period Lightcurves of 1996 FG, 1998 PG, and (5407) 1992 AX: One Probable and Two Possible Binary Asteroids, Icarus, 146:190-203.
		P02a: Pravec, Petr, Šarounová, Lenka, Hicks, Michael D., Rabinowitz, David L., Wolf, Marek, Scheirich, Peter, and Krugly, Yurij N., 2002, Two Periods of 1999 HF -Another Binary NEA Candidate, Icarus, 158:276-280.
		W05b: Warner, Brian D., Petr Pravec, Alan W. Harris, Adrian Galad, Peter Kusnirak, Donald P. Pray, P. Brown, Z. Krzeminski, Walter R. Cooney Jr., et al., 2005, "Binary Hungarias (5905) Johnson and (9069) Hovland: their Relations to Small Binary Vestoids and NEAs", IAU Symposium #229 abstract.
	pages.prodigy.net /wrjohnston/astro/amsources.html (2702 words)

	[No title]
		Hudec, René - Rezek, T. - arounová, Lenka - Pravec, Petr - Hroch, Filip - Castro-Tirado, A. - Gorosabel, J. - Pedersen, H. - Wenzel, W. - Kroll, P. Metcalfe, L. - Palazzi, E. Optical investigations of GRBS 960720 and 970402.
		Pravec, Petr - arounová, Lenka - Wolf, M. - Krugly, Y. - Velichko, F. - Shevchenko, V. - Chiorny, V. - Gaftonyuk, N. - Genevier, G. Two-period lightcurves of 1996 FG3, 1998 PG, and (5407) 1992 AX: one probable and two possible binary asteroids.
		Pravec, Petr - arounová, Lenka - Wolf, M. - Vasquez Ferrin, I. - Zhu, J.
	www.iach.cz /knav/a00/6308.htm (851 words)

	SPACE.com -- Tracking Asteroids in Eastern Europe
		Rather, explains Pravec, the Czech observatory's emphasis is on tracking asteroids that already have been discovered.
		Pravec was awarded one such grant for his work on the Ondrejov Observatory's NEO (Near Earth Object) Photometric Program.
		There remains a concern, however, that most asteroid tracking is done in the Northern Hemisphere, leaving a large portion of the sky unmonitored.
	www.space.com /news/asteroid_grants.html (424 words)

	Sun Never Sets, For Long, On Fast-Spinning, Water-Rich Asteroid (Site not responding. Last check: 2007-10-21)
		A second team of astronomers used optical telescopes to track 1998 KY26, which was discovered by the University of Arizona's Spacewatch telescope, the world's first instrument dedicated to searching for near-Earth asteroids.
		Petr Pravec of the Czech Republic’s Academy of Sciences said collisions likely gave 1998 KY26 its rapid spin.
		But one way or another, Pravec said, this object's 10.7- minute "day" is the shortest of any known object in the solar system.
	www2.jpl.nasa.gov /neo/news/news044.html (887 words)

	Paradoxes Resolved, Origins Illuminated - Hermes is a double asteroid
		On October 24th, Petr Pravec (Ondrejov Observatory, Czech Republic) reported to the Minor Planet Mailing List that brightness fluctuations detected by Brian Warner, Peter Kusnirak, and David Higgins yield "a clear and unique period" of 13.89 hours.
		Because the components are close, perhaps almost touching, their rotation rates probably match their period of revolution around one another, but that conclusion awaits further data.
		According to Pravec’s list, there are now 18 confirmed binaries among the near-Earth asteroids.
	www.metaresearch.org /msgboard/topic.asp?TOPIC_ID=363 (270 words)

	Sun never sets, for long, on fast-spinning asteroid
		A second team of astronomers used optical telescopes to track 1998 KY26, which was discovered by the University of Arizona's Spacewatch telescope, the world's first instrument dedicated to searching for near-Earth asteroids.
		Petr Pravec of the Czech Republic's Academy of Sciences said collisions likely gave 1998 KY26 its rapid spin.
		But one way or another, Pravec said, this object's 10.7- minute "day" is the shortest of any known object in the solar system.
	www.jpl.nasa.gov /releases/99/98ky26.html (842 words)

	(meteorobs) Excerpt from "CCNet LETTERS TO THE MODERATOR, 16 March 2000" (Site not responding. Last check: 2007-10-21)
		>From Petr Pravec Charles F. Peterson wrote: > In terms of useful information about NEAs, it would seem that the > velocity of the surface of the asteroid tells more than the rotational > period.
		Petr Pravec ----------------- CCNet-LETTERS is the discussion forum of the Cambridge-Conference Network.
		Contributions to the on-going debate about near-Earth objects, the cosmic environment of our planet and how to deal with it are welcome.
	www.meteorobs.org /maillist/msg18024.html (388 words)

	Press Conference Schedule
		Still, using data taken from spacecraft flybys, ground-based observations, and computer modeling, a new view of has evolved which suggests that many large asteroids are "rubble-piles", collections of large and small components held together not by physical strength but by the gravitational attraction of the components themselves.
		For example, Pravec has recently made an extensive study of near-Earth asteroid (NEA) rotation rates using his own observations and data provided by astronomers from all over the world.
		These bodies are small enough that they do not present a contradiction to the rubble-pile hypothesis; instead, they provide the "missing link" astronomers have been looking for, filling the gap between between km-sized asteroids, which cannot spin overly fast, and meter-sized meteorites, which are known to be solid.
	www.news.cornell.edu /releases/July99/ACM/pressconf.html (6947 words)

	The Dionysus Occultation Page
		Yura Krugly, at Kharkov, Ukraine and Petr Pravec at Ondrejov, Czech Republic, independently determined a synodic rotation period of 2.7 hours from observations taken in May and June 1997, respectively.
		Since Dionysus at this time is observable for only 4 hours at most from a particular site, we asked Petr Pravec at Ondrejov Observatory, whether he could resume his Dionysus observing program, which would allow us to achieve a continuous lightcurve coverage of nearly 7 hours.
		This hypothesis was already suggested to explain the irregular lightcurves of 1991 VH (Pravec et al.
	earn.dlr.de /dionysus/background.html (512 words)

	NASA's Solar System Exploration: News & Events: 03.12.07: Solar Power at Play
		[1] Stephen C. Lowry, Alan Fitzsimmons, Petr Pravec, David Vokrouhlicky, Hermann Boehnhardt, Patrick A. Taylor, Jean-Luc Margot, Adrian Galad, Mike Irwin, Jonathan Irwin, and Peter Kusnirak (2007).
		[2] Patrick A. Taylor, Jean-Luc Margot, David Vokrouhlicky, Daniel J. Scheeres, Petr Pravec, Stephen C. Lowry, Alan Fitzsimmons, Michael C. Nolan, Steven J. Ostro, Lance A. Benner, Jon D. Giorgini, Christopher Magri (2007).
		Petr Pravec Astronomical Institute AS CR Ondrejov, Czech Republic Phone: +420 323-620352, +420 737-322815 Email: ppravec (at) asu.cas.cz, suchan (at) astro.cz
	sse.jpl.nasa.gov /news/display.cfm?News_ID=18035 (888 words)

	Publications
		Brian Warner, Petr Pravec, Peter Kusnirak, Cindy Foote, Jerry Foote, Adrian Galad, Stepfan Gajdos, Leos Kornos, Jozef Vilagi, David Higgins, Shannon Nudds, Yurij N Kugly and Ninel M. Gatonyuk
		Brian Warner, Petr Pravec, Peter Kusnirak, Zuzana Kanuchova, Marek Husarik, David Higgins
		David Higgins, Dr Petr Pravec, Peter Kusnirak, Gianluca Masi, Adrian Galad et al, Donald Pray
	www.david-higgins.com /Astronomy/publications.htm (436 words)

	[64.06] Amateur Contributions to Asteroid Lightcurve Studies (Site not responding. Last check: 2007-10-21)
		Kassalainen has also been a leader in the difficult problem of lightcurve inversion where lightcurve data is used to determine the shape of an asteroid.
		In addition, Alan Harris and Petr Pravec have used lightcurve data to determine trends within the asteroid system regarding spin rates versus size, most notably finding certain "barriers" or zones that preclude or favor certain size/rate combinations.
		In recent years, amateur astronomers have been providing an ever-growing number of lightcurves to the statistical pool and forming collaborative efforts aimed at assisting profession astronomers such as those above in order to provide the necessary data for further development and refinement of asteroid-related theories.
	www.aas.org /publications/baas/v36n2/aas204/20.htm (304 words)

	Measurement of the light pollution: a project for the Grant Agency of the Czech Republic
		New people, students, astronomers and lighting engineers will be engaged for the investigation of consequences and remedies of outdoor lighting.
		The co-applicant Petr Pravec is doing photometry at Ondrejov Observatory of the Astronomical Institute of Academy of Sciences of the Czech Republic.
		The collaborator Petr Baxant is evaluating luminance information from digital images with respect to glare and visual comfort.
	amper.ped.muni.cz /~jhollan/light/grant/lp_res.html (2291 words)

	Text: Fastest Spinning Asteroid Holds Possible Human Benefits
		Its 30-meter diameter rotates at 10.7 minutes, triggering a sunrise or sunset every five minutes, said Dr. Petr Pravec of the Czech Republic's Academy of Sciences.
		Dr. Petr Pravec of the Czech Republic's Academy of Sciences said collisions likely gave 1998 KY26 its rapid spin.
		But one way or another, Pravec said, this object's 10.7-minute "day" is the shortest of any known object in the solar system.
	www.usembassy-israel.org.il /publish/press/global/archive/1999/july/gi1728.htm (1088 words)

	OBSERVATION SUMMARY PAGE (Site not responding. Last check: 2007-10-21)
		As an interesting side note, her data has been found to be useful to Dr. Petr Pravec of Ondrejov Observatory, located in the Czech Republic.
		Her work may be included as part of his expanded study of this interesting object.
		This was in support of a request by Dr. Petr Pravec (Ondrejov Observatory).
	www.sdsmt.edu /space/boOBSSUM.htm (963 words)

	USATODAY.com - Asteroids found to have twins, moons (Site not responding. Last check: 2007-10-21)
		The two moons of Mars, Phobos and Deimos, are probably asteroids captured in orbit by the planet's gravitational tug.
		Czech astronomer Petr Pravec said the study of near-Earth asteroids is becoming more important — especially if scientists are going to entertain ways to defend the planet from potential asteroid impacts.
		"If some of them are on a collision course with the Earth in the future, it will be more difficult to divert them than if they were a single asteroid," Pravec said.
	www.usatoday.com /news/science/astro/2001-05-31-asteroid-moon.htm (565 words)

	Michael W. Busch
		Shri Kulkarni at Caltech, Petr Pravec at the Czech Academy of Science, and
		I am currently working on the near-Earth asteroid 29075 (1950 DA), which was observed by radar and optical telescopes in 2001.
		With Oded Aharonson, I have simulated a wide variety of different geometries using the MCNPX particle-physics code to quantify the limits of the instrument.
	www.gps.caltech.edu /~busch (1121 words)

	ScienceDaily: Potential Hazard Of Earth-Asteroid Collisions To Be Discussed At International Space Conference
		A new view has evolved, suggesting that many large asteroids are "rubble-piles," according to William Bottke, a research associate in Cornell's Department of Astronomy, who will moderate the press session (Friday, July 30, 10 a.m., Princeton-Yale Room, Statler Hotel) on asteroid moons and spins.
		But data taken from spacecraft fly-bys, ground-based observations and computer modeling indicate that large asteroids are no more than piles of rubble held together not by physical strength but by the gravitational attraction of the pieces of rubble.
		Although Pravec's research, based on an extensive study of near-Earth asteroid (NEA) rotation rates, is consistent with the "rubble-pile" scenario, his new results suggest that some small asteroids are solid.
	www.sciencedaily.com /releases/1999/07/990719081912.htm (1159 words)

	(5407) 1992 AX
		Companion discovered in analysis of observations made 7 January-14 February 1997 by Petr Pravec, Lenka Sarounová, David L. Rabinowitz, Michael D. Hicks, Marek Wolf, Yurij N. Krugly, Fiodor P. Velichko, Vasilij G. Shevchenko, Vasilij G. Chiorny, and Guy Genevier.
		Cambridge-Conference Network 103/2000-11 October 2000: Tidal Disruption of Asteroids by Petr Pravec.
		Pravec, Petr, Sarounová, Lenka, Rabinowitz, David L., Hicks, Michael D., Wolf, Marek, Krugly, Yurij N., Velichko, Fiodor P., Shevchenko, Vasilij G., Chiorny, Vasilij G., Gaftonyuk, Ninel M., & Genevier, Guy 2000, Icarus, Volume 146, Issue 1, pp.
	www.johnstonsarchive.net /astro/astmoons/am-05407.html (200 words)

	Manuscripts Submitted to Icarus: August 1996 (Site not responding. Last check: 2007-10-21)
		Petr Pravec, Marek Wolf, Lenka Sarounova, Alan W. Harris, and John K. Davies
		Preprints: Petr Pravec, Astronomical Institute, CZ-25165 Ondrejov, Czech Republic
		Preprints: Petr Pravec, Astronomical Institute AS CR, CZ- 25165 Ondrejov, Czech Republic
	astrosun.tn.cornell.edu /Icarus/Submitted/Papers_960831.html (363 words)

	EOLSS - Earth System: History and Natural Variability : Related Chapters
		Petr Pravec, Astronomical Institute, AS CR, Czech Republic
		Petr Storch, Institute of Geology, Academy of Sciences, Czech Republic
		Petr Pokorny, Institute of Botany, Czech Academy of Sciences, Czech Republic
	www.eolss.net /E1-01-toc.aspx (735 words)

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