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Topic: Occultation

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In the News (Thu 18 Apr 19)

  Occultation - Wikipedia, the free encyclopedia
The term occultation is most frequently used to describe those relatively frequent occasions when the Moon passes in front of a star during the course of its orbital motion around the Earth.
Occultations of Aldebaran are presently only possible by the Moon, because the planets pass Aldebaran to the north.
Within a mile or two of the edge of an occultation's predicted path, referred to as its northern or southern limit, an observer may see the star intermittently disappearing and reappearing as the irregular limb of the Moon moves past the star, creating what is known as a grazing occultation.
en.wikipedia.org /wiki/Occultation   (1473 words)

 SPA Occultation Section
By definition, an occultation is the passage of one astronomical body directly in front of another so that as seen from an observer on Earth, the further body is hidden from view.
Details of occultations that are due to take place in the near future are listed in the Sky Diary in Popular Astronomy and further details about these events and how to observe and record them are available from this observing section.
Occultation of ZC 3167 by Titania on 8 September 2002
www.popastro.com /sections/occ.htm   (308 words)

 Grazing occultation - Wikipedia, the free encyclopedia
A grazing occultation is a special type of lunar occultation that occurs within a mile or two of the edge of an occultation's predicted path, referred to as its northern or southern limit.
Within that narrow zone, an observer may see the star intermittently disappearing and reappearing as the irregular limb of the moon moves past the star, creating what is known as a grazing occultation.
The accurate timing of lunar occultations is performed regularly by (mostly amateur) astronomers.
en.wikipedia.org /wiki/Grazing_occultation   (275 words)

 Steve's Asteroid Update HELP Page
Occultation is a generic astronomical term for a situation where one body "covers" or "passes in front of" another body.
We use the term asteroid occultation for the situation where an asteroid occults a star for observers on the earth.
An asteroid occultation prediction predicts the path of the asteroid's shadow on the earth.
www.asteroidoccultation.com /asteroid_help.htm   (2595 words)

Before and after the occultation a brief dimming of the star was observed that demonstrated that Pluto had a tenuous atmosphere with a surface pressure of approximately 0.01mbar.
One of the big surprises of the 1988 occultation was the discovery of a suprisingly dense atmosphere, presumably of methane, around the planet.
Observations of the occultation of stars by Uranus and Neptune have revealed the presence of previously unknown rings and satellites.
www.iac.es /galeria/mrk/Pluto/Pluto_occultation.htm   (950 words)

 UVIS Ring Occultation Priorities for Revs 29-37
There are sets of occultations with similar geometries, including full radial cuts that reach in some cases to the cloudtops, and grazing occultations with turn-around points in various parts of the A and B rings.
The ability to resolve high optical depth regions in the rings depends on both the star brightness and the geometry of the occultation, including whether it is on the lit or unlit face, if it is in the shadow of the planet, and the angle of the starlight with respect to the ring plane.
Occultations at different distances from the rings provide information about the particle size distribution on the scale of the Fresnel zone (~10m).
lasp.colorado.edu /~colwell/uvis/URStarRevs29-37redux.htm   (654 words)

 Paul Maley Occultation Page   (Site not responding. Last check: 2007-10-22)
We consider the occultation of a 7.6 magnitude star SAO 060107 by the 76 km diameter asteroid known as (516) Amherstia.
Visually, it would be easy to time the occultation of the star, but the asteorid would be too dim to detect in a typical sky condition.
Several minutes before central occultation, the asteroid is now immersed in the glare of the bright star.
www.eclipsetours.com /occultationb   (550 words)

 Pittsburgh Occultation Updates   (Site not responding. Last check: 2007-10-22)
Occultation: the obscuration of one celestial body by another of greater apparent diameter, especially the passage of the Moon in front of a star or planet.
Grazing occultation 1 passes within 5.2 miles of the Wagman Observatory on the evening of Wednesday December 15, but will be tricky due to the low altitude.
Occultation times for the Pittsburgh area, presented in two different formats (text file and CSV file) and for 5 different sizes of scopes (4, 8, 12, 16, and the 20-inch "I must be crazy to look at the Moon" size).
members.aol.com /jwholtz/occult/occultupdate.htm   (284 words)

 Search Results for "Occultation"
occultation, (ok´lta´shn) (KEY), in astronomy, eclipse of one celestial body by another, e.g., when the moon lies between a star and the earth.
Astronomy To conceal by occultation: The moon occulted Mars.
The central belief of Twelve-Imam Shiites is the occultation (or disappearance from view) of the 12th Imam.
www.bartleby.com /cgi-bin/texis/webinator/sitesearch?FILTER=&query=Occultation   (306 words)

 Paul Maley Occultation Page   (Site not responding. Last check: 2007-10-22)
But, the observer must be seated during the occultation in a comfortable position since he/she must watch the target star to be occulted without interruption for 6 minutes: 3 minutes before and after the predicted time of occultation.
Notify occultation organizer where you plan to be located (unless you have already agreed to occupy a site assigned by the organizer) and what equipment you are using.
Even if the path is well understood and you are predicted to be in the path and do not see any occultation, this negative data is extremely vital to the assessment or confirmation of other observations of either the primary occultation or a secondary event (meaning possible evidence of a satellite).
www.eclipsetours.com /occultationc   (4850 words)

 IOTA Main Table of Contents
Occultations of the 7 Brightest Pleiads for North America
Occultation of Stars by the Planets and Their Moons
Occultations for Belgium, France, Spain, and Portugal - J. Schwaenen
www.lunar-occultations.com /iota/iotandx.htm   (370 words)

 Occultation: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-22)
The term occultation is most frequently used to describe those relatively frequent occasions when the Moon[For more, click on this link] passes in front of a star star quick summary:
Lunar occultations timed to an accuracy of a few tenths of a second have various scientific uses, EHandler: no quick summary.
An asteroid occultation occurs when an asteroid passes in front of a star (occults a star), temporarily blocking its light (as seen from earth)....
www.absoluteastronomy.com /encyclopedia/o/oc/occultation.htm   (2267 words)

 RASNZ Occultation Section - Software
Human reaction time is the single largest cause of error in occultation timings, and its effects can have serious consequences, especially in the case of minor planet occultations where reaction times (differing between Disappearance and Reappearance) can be a substantial fraction of the occultation duration.
When minor planet occultations are observed from multiple sites, large differences in the reaction times of the observers lead not only to uncertainty in the actual length of the chords, but also to large offsets between adjacent chords.
The International Lunar Occultation Centre (ILOC) in Japan has determined, thorugh the analysis of many tens of thousands of lunar occultation observations over many years, that the average reaction time for a lunar occultation disappearance timed by an experienced observer is of order 0.4 seconds.
occsec.wellington.net.nz /software/software.htm   (746 words)

 Occultation by Binary Kuiper Belt Object Tonight
But the object is so distant and the uncertainies are so large that an occultation is possible from most of the hemisphere facing the target star for a period of nearly an hour centered on the above time.
Below are first, two new messages giving the results of update astrometry for this event, then two other messages, the first from Jean Lecacheux, describing the duplicity of this KBO and the implications of that for observing the event.
Anyway, it is not a desesperate case as it is a double asteroid, so the probability of an occultation by one of the two components is not zero.
iota.jhuapl.edu /kbo.htm   (1160 words)

 Occultation Item @ AlienArtifacts.com (Alien Artifacts)   (Site not responding. Last check: 2007-10-22)
Although this phenomenon is usually referred to as an "eclipse", this term is a misnomer, because the Moon is not eclipsing the Sun; instead the Moon is occulting the Sun.
4 Occultations of bright stars (<4 mag) and planets by planets between 1800 and 2100
Occultations of bright stars (<4 mag) and planets by planets between 1800 and 2100
www.alienartifacts.com /encyclopedia/Occultation   (1169 words)

 How to use the IOTA grazing occultation limit and profile predictions
The second part is a partially edited and illustrated section of the old IOTA occultation manual, including the chapters that explain use of the IOTA predictions and ACLPPP lunar limb profiles to plot graze paths and set up expeditions.
Motion in longitude has two effects on grazing occultation position angles: a shift along the limb, which is the dominant effect, and motion along the sur- face, a much smaller effect near the lunar poles, but dependent on the lunar motion and librations at graze time.
From time to time it is suggested in Occultation Newsletter that an empirical correction be applied to a certain class of profiles to better position graze stations based on trends in the graze shifts noticed by recent expeditions.
iota.jhuapl.edu /ocmangrz.htm   (11136 words)

 Radio Occultation Observations using Global Navigation Satellite Signals A New Tool for Exploring the Atmosphere
From the mid-1960s onwards, radio occultation techniques have been used with great success by planetary missions to measure vertical profiles of density and temperature for the atmospheres of Venus, Mars and the outer planets.
One of the main strengths of the radio occultation observations is their high vertical resolution, which captures important small vertical-scale variability of the atmosphere.
Recognising the value of radio occultation observations for climate research and operational meteorology, ESA's Earth Science Advisory Committee has finally recommended that as many flight opportunities as possible be found for the GRAS instrument.
esapub.esrin.esa.it /eoq/eoq54/silve54.htm   (2184 words)

 Occultation by Jupiter (01-07... April 2003)
The atmospheric occultations can be attempted in the methane band at 0.9 microns, or better, in K (2.2 microns).
We did observed a stellar occultation by Jupiter in October 1999 with a K= 9.9 star, and the contrast star/Jupiter's limb was very good.
An interesting issue is the possible detection of small unknown satellites, as the small ones presently detected near the main ring (namely Metis, and Adrastea, with radii ~ 10-20 km) are probably the tip of a larger population of as-yet unnoticed km-sized or less chunks.
calys.obspm.fr /~sicardy/jupiter/jupiter.html   (900 words)

 Radio Occultation Latitude Coverage   (Site not responding. Last check: 2007-10-22)
Radio occultation experiments with MGS began in January 1998 and are continuing today.
The measurement latitude is determined by the position of Earth relative to the MGS orbit plane, and the latitude varies continually due to the orbital motion of Earth and Mars about the Sun.
Occultations occur at high latitudes when Earth is in or near the MGS orbit plane, but no occultations occur when the MGS orbit is nearly face-on as viewed from Earth.
www-star.stanford.edu /projects/mgs/coverage.html   (215 words)

 Mike Kretlow: Occultation Informations and Resources
Asteroidal occultation reports and results (Europe) are maintained by Eric Frappa at euraster.net/results and also by Jan Manek at his website.
Occultations by Titan on 2003 Nov 14: for the first occultation (of TYC1343-1615-1 @ ~00:10UT) there was a observation campaign and expedition organized by the Observatory Paris-Meudon and the IOTA to Namibia, South Africa and La Reunion.
Occultation of HIP 106829 by Titania on 2001 Sep 08: the event was successful observed by several european expeditions (see also Bruno Sicardy's website for details).
astro1.physik.uni-siegen.de /uastro/occult   (1355 words)

 Asteroid occultation predictions
I've ceased posting asteroid occultation predictions of my own; it's a tough thing to keep up with, and several people are doing a better job of it than I probably would anyway.
Unless clicking on an entry in the "asteroid occultation table" has already done it for you, you should set up Guide for the approximate date/time of the event, and "go to" either the asteroid or the star that is going to be occulted.
Tips on making the occultation charts in Guide 8.0 "look good": Once you've zoomed in/out and panned over to get the sort of field of view you really want, you may decide that it would be nice to have more cities shown, or fewer cities shown, or no cities at all shown.
www.projectpluto.com /ast_occu.htm   (1579 words)

 SPACE.com -- Rare Event: Jupiter to Hide Behind the Moon
But the 6 B.C. occultation of Jupiter on April 17 was perhaps the most important component.
During the occultation, it will be possible to also watch three of Jupiter's four largest satellites disappear.
The moons will likely be lost in the glare of the bright lunar crescent just before they disappear behind the Moon, but their emergence from behind the Moon’s dark side should be readily visible through binoculars or a small telescope.
www.space.com /spacewatch/041203_jupiter_occultation.html   (1720 words)

 21st century - Wikipedia, the free encyclopedia
October 1, 2044: Occultation of Regulus by Venus.
After 2044 the next occultation of Regulus by Venus will occur on October 21, 3187, although some sources claim it will occur again on October 6, 2271.
This event will be the first occultation of a planet by another since January 3, 1818.
en.wikipedia.org /wiki/21st_century   (3339 words)

 Dobsonian Occultation Scope Project
DOT stands for Dobsonian Occultation Telescope and is a telescope designed specifically for recording occultation events, both lunar and asteroidal.
As stated above, the purpose of DOT is to record occultation events using video, and since each video frame rate is a fraction of a second, the field rotation problems associated with Alt/Az mounts is not a concern.
The intent of DOT is to use video imaging to capture occultation events and therefore even with a secondary diagonal, a camera would still be placed at prime focus.
www.pfdsystems.com /dot.htm   (570 words)

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