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Topic: Janssen (Lunar crater)

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	Courses in Astrophotography
		This is an ancient and heavily erroded lunar impact crater 100km in diameter.
		This crater is 40km in diameter, and 3600m from the crater floor to rim.
		This is a well-known lunar impact crater 83km in diameter and lies on the eastern edge of the Mare Imbrium.
	www.damianpeach.com /lunar.htm (3755 words)

	Janssen (lunar crater) - Wikipedia, the free encyclopedia
		Janssen is an ancient impact crater located in the highland region near the southeastern lunar limb.
		Connected to the northeast rim is the Metius crater, and to the north is the heavily worn Brenner crater.
		Southeast of Jannssen are the co-joined Steinheil and Watt craters.
	en.wikipedia.org /wiki/Janssen_(lunar_crater) (306 words)

	Lunar and Planetary Science, winter 1998-1999, Lunar Mapping Lab
		The crater and its ejecta unit occurs on top of the smooth plains unit, and thus is younger.
		Cratering continued after the emplacement of the smooth plains unit, as seen by the craters superposed on the smooth plains and the large, young crater mapped as its own unit.
		Euler is an impact crater, 28 km in diameter, located at 23 degrees 20'N, 29 degrees 10'W, placing it on the rim of the Imbrium basin on the near side of the moon (see figure 5).
	abacus.bates.edu /~gclough/lps/moonmap.html (2048 words)

	ALS Lunar Observers Certificate List of Objects (Site not responding. Last check: 2007-10-15)
		Crater Janssen: old crater from the Pre-Nectarian Period, with hummocky material in its northern aspect (ejecta from the Nectaris Basin impact).
		Crater chains are generally the result of a string of meteorites which are still gravitationally bound.
		Crater Tycho: One of the youngest complex craters on the moon.
	www.lunar-reclamation.org /observation_list.htm (2616 words)

	Астронет > Janssen
		The center of Janssen includes a broad, rough-textured mound of material that the US Geologic Survey named the Janssen Formation - it is ejecta from the formation of the Nectaris impact basin.
		Thus, the crater Janssen is pre-Nectarian in stratigraphic age - that is the oldest age group on the Moon.
		Most rilles occur on maria lavas, but the Janssen patch of smoothness is not dark at full Moon and doesn't have the spectral properties of maria.
	www.astronet.ru:8100 /db/msg/1200315 (283 words)

	Fabricus
		is a lunar impact crater that is located within the northeast part of the Janssen walled plain.
		Attached to the north-northwest rim is the slightly larger Metius crater.
		The crater has multiple central peaks that rise to 0.8 km, with a rugged rise to the northwest running north-south.
	www.astrosurf.com /grenier/crateres/pages/fabricus.htm (147 words)

	CHAPTER 5: PLANETARY GEOLOGY: Manual of Remote Sensing
		The heavily cratered regions occur mostly in the southern hemisphere, and are separated from smoother and possibly topographically-lower northern plains regions by a global-scale boundary scarp.
		The bright crater Kuiper near the center of the image (60 km diameter) is one of the largest young craters on Mercury and defines the Kuiperian stratigraphic unit, analogous to the Copernican unit on the Moon.
		The craters at the heads of the islands are 8 km (upper) and 10 km (lower) diameter, and represent the compacted obstacles that caused the water to be diverted.
	marswatch.tn.cornell.edu /rsm.html (18132 words)

	Moon Society: Geologic Processes on the Moon (Site not responding. Last check: 2007-10-15)
		Thus medium sized craters that have a sharp rim, rim deposits, terracing, a central peak, a continuous and discontinuous ejecta and a bright ray pattern are the youngest.
		Medium sized craters that have lost their continuous ejecta and their 'sharp' rim are from the next period, called the 'Nectarian Period.' This period extends from 3.85 to 3.92 billion years of age.
		Lunar Consoladated Atlas - clickable thumbnails of each section of the Moon's nearside hemisphere - be patient while the thumbnails load, then browse and open any that catch your interest for a larger view (c.
	www.moonsociety.org /certificate/lunargeology.html (4843 words)

	The Full Moon Atlas
		In the shadows near the upper left corner is Crater Piccolomini.
		When displayed, approximate crater diameters (in kilometers) are shown within parenthesis.
		Lunar Republic, S.A. and the International Lunar Society.
	www.lunarrepublic.com /atlas/sections/g5.shtml (157 words)

	3towers Observatory Lunar 1000 (Site not responding. Last check: 2007-10-15)
		L2 is Earthshine, and L3 represents the dichotomy between the Lunar highlands and the Lunar Maria.
		Kant is the crater with the central peak at the bottom of the image.
		West of it is the complex crater Stofler with Faraday overlying its Southwest rim.
	www.3towers.com /3towersObservatoryLunar100.htm (1149 words)

	Lunar crater locations - Wikipedia, the free encyclopedia
		Evidence collected during the Apollo Project and from unmanned spacecraft of the same period proved conclusively that meteoric impact, or impact by asteroids for larger craters, was the origin of almost all lunar craters, and by implication, most craters on other bodies as well.
		However, it is believed that many of the lunar mare were formed by giant impacts, with the resulting depression filled by up-welling lava.
		Craters typically will have some or all of the following features: a surrounding area with materials splashed out of the ground when the crater* was formed, this is typically lighter in shade than older materials due to exposure to solar radiation for a lesser time.
	en.wikipedia.org /wiki/Lunar_Crater_Locations (460 words)

	Steinheil
		is a lunar impact crater that is located in the rugged highlands in the southeastern part of the Moon.
		It forms a prominent crater pair with the similar-sized Watt crater, which it partly overlays to the southeast.
		There are a few tiny craterlets along the rim and inner wall, the most notable being a crater at the base of the inner noirtheast rim.
	www.astrosurf.com /grenier/crateres/pages/steinheil.htm (215 words)

	Astronomical League - Lunar Club Project
		The combination of minute craters around it's edges along with the soft indentations and central peak makes it a truly fine place to stop and study for awhile.
		For it as the first lunar object to be lighted by an Earth based laser in 1962.
		Crater Hipparchus is front and center on the terminator while Albategnius appears to its' right.
	members.tripod.com /~theastronomer/lunarclub/page6.html (1156 words)

	horst janssen (Site not responding. Last check: 2007-10-15)
		Zacharias Janssen (1580â“1638), a Dutch spectacle-maker; invented a compound microscope.
		Jan Janssen (born 1940), a Dutch professional cyclist.
		Janssen, a lunar crater named after Pierre Janssen.
	35710-janssen.110.staplerguy.com (200 words)

	Lunar Images with Maksutov-Cassegrain (Site not responding. Last check: 2007-10-15)
		Crater Cassini at center with the lone summit of Piton brilliantly lit by the rising sun.
		Crater pits caused by the creation of Copernicus, out of image at upper right, can be seen to right.
		Craters Watt, Steinheil and Janssen, upper right, along with the Rheita Valley are clearly visible along the morning terminator.
	www.fortunecity.com /victorian/canterbury/222/maksutov.htm (522 words)

	Peter Lloyd's Lunar Pictures (SE) (Site not responding. Last check: 2007-10-15)
		Boussingault is a fascinating crater in the libration zone of the far south.
		The craters Theophilus and Cyrillus are situated on the eastern shores of the Mare Nectaris on the western side of the Moon.
		Walter is an old crater in the northern part of the southern highlands.
	www.madpc.net /~peterl/Moon/Craters/SouthEast.html (1462 words)

	MC at home's Science Page
		I started taking a few photos the night of February 25, 2004 and here are a few of the Moon and a Saturn taken that night...
		Notice the rill running along side the little crater near the central peak.
		The crater Ptolemaeus is an amazing view under good seeing conditions.
	mywebpages.comcast.net /mwconte/meade_lpi.htm (334 words)

	The Lunar Doughnut (Site not responding. Last check: 2007-10-15)
		The Lunar Doughnut is a rare shadow feature that looks like a grey crater with a dark center, in an area without any significant crater feature.
		This sketch shows the crater Janssen near the south-eastern limb at the top of the sketch.(South is up).
		Below Janssen are the craters Steinheil and Watt, and the eastern rim of Fabricius.
	www.whiteoaks.com /sketches/doughnut.html (106 words)

	Pierre Janssen
		An indispensable preliminary was the virtual elimination of oxygen absorption in the earth's atmosphere, and his bold project of establishing an observatory on the top of Mont Blanc was prompted by a perception of the advantages to be gained by reducing the thickness of air through which observations have to be made.
		This observatory, the foundations of which were fixed in the snow that appears to cover the summit to a depth of ten metres, was built in September 1893, and Janssen, in spite of his sixty-nine years, made the ascent and spent four days taking observations.
		In 1875 he was appointed director of the new astrophysical observatory established by the French government at Meudon, and set on foot there in 1876 the remarkable series of solar photographs collected in his great Atlas de photographies solaires (1904).
	www.nndb.com /people/937/000100637 (301 words)

	Lunar observing log: A 4-day-old Moon
		Strangely, this lunar feature is not labelled in the Clementine Atlas of the Moon, though it is listed in the gazetteer at the back of the atlas.
		The Humboldtianum basin is situated between Endymion and the lunar limb, and extends onto the far side of the Moon.
		The crater Janssen and the Rheita Valley will be discussed in a separate article.
	www.backyard-astro.com /solar/moon/050114/moon.html (760 words)

	Lake County Astronomical Society NightTimes
		Early in the lunar month, near the limb in the southeast quadrant, there’s a wealth of detail available to those looking for lunar scenery.
		The Rheita valley is a long gash extending toward the southeast from the south side of the crater Rheita.
		The crater Fabricius is rugged, with a high central peak.
	www.bpccs.com /lcas/Articles/moonvaly.htm (469 words)

	Galileo's Moon Drawings
		Cherrington believes the large crater on the terminator is Deslandres, which as we indicate on our homepage, is an attractive candidate as to size and position, but cannot be reconciled with Galileo's description of its floor as being bright on the side away from the Sun, and dark on the side towards it.
		If his identifications of lunar features are unreliable (not due to his lack of lack of experience in recognizing them, but rather due to their being depicted in an unpredictable way), then the dates he derives based on his supposed identifications are highly questionable.
		Lunar longitudes are measured from the central meridian with east positive.
	www.pacifier.com /~tpope/Moon_Page.htm (15497 words)

	Peter Lloyd's Astronomy Pages (Site not responding. Last check: 2007-10-15)
		The largest crater, at 196 Km, and oldest, at 4,200 million years, is Janssen.
		Vlacq, to the south, is another old crater at about 4,200 million years; it is 92 Km in diameter and 3000 metres deep.
		There is a beautiful picture of Watt in Lunar Picture of the Day for 18th January 2006.
	homepage.ntlworld.com /peter.lloyd3/Moon/Craters/Fabricius040901.html (245 words)

	Jane Houston Jones; The lunar doughnut 01/06/03 (Site not responding. Last check: 2007-10-15)
		The first craters I spotted were the pair of craters Steinheil and Watt on the south-eastern limb of the moon.
		A similar "cobblestone or hashmark" rippled surface feature filled the lunar space between these two craters and the doughnut, but was the same shade of light gray as the surrounding landscape.
		To end the bakers dozen of craters aligned north and south of the doughnut were another set of twin craters Reichenbach and Stevinus.
	observers.org /reports/2003.01.06.8.html (481 words)

	The Moon - Lunar Images by Philipp Salzgeber
		Tilted Moon Images - With a technique devised by J-P Metsavainio it is possible to tilt images of the moon to rectify regions near the lunar limb which would be otherwise heavily distorted.
		The Craters Aristarchus and Herodotus with the Schröter Valley
		clavius.html The crater Clavius with the smaller crater Porter sitting on its edge.
	www.salzgeber.at /astro/moon (417 words)

	[No title]
		Samples of a number of natural rock surfaces, collected at the Lunar Crater Volcanic Field, Nevada, and in the Eastern Desert, Egypt [5], were used as analogues to blocks of the martian surface.
		GPR data collected around terrestrial impact craters discriminates in situ bedrock, ejecta, alluvium, and calcic soils, thereby highlighting the potential of the instrument in a variety of planetary settings.
		Muhleman D. O.* Janssen M. Clancy R. Frerking M. Gulkis S. McCleese D. Zurek R. Haberle R. Temperature/Pressure and Water Vapor Sounding with Microwave Spectroscopy Two intense microwave spectral lines exist in the martian atmosphere that allow unique sounding capabilities: water vapor at 183 GHz and the (2-1) rotational line of CO at 230 GHz.
	www.lpi.usra.edu /meetings/programs/msattiiwa.txt (8518 words)

	Chapter 6—Part 1 (Site not responding. Last check: 2007-10-15)
		But Huggins' notebook entries show he was pre-occupied in 1867 with his experiments designed to measure the heat of celestial bodies, observing changes in the lunar crater Linné, and, by 1868, beginning his measures of stellar motion in the line of sight.
		Before clouds obscured his view of the eclipsed sun, Janssen was able to subject two large solar prominences to spectroscopic examination.
		Lockyer and Janssen were awarded a special medal by the French government in honor of their independent discoveries.
	eee.uci.edu /clients/bjbecker/huggins/ch6.html (5502 words)

	Dave Miller Astrophotography
		The "Lunar 100" is a list of interesting lunar features compiled by Charles Wood and published in the April 2004 issue of Sky and Telescope magazine (Introducing the Lunar 100, page 113).
		Included in the list below are page references to detailed lunar maps found in the book Atlas of the Moon by Antonín Rükl.
		This book started it's second printing in December 2004 and is available from the Sky and Telescope website.
	www.cosmicdoorway.com /reference/lunar_100.shtml (208 words)

	Zoom Astronomy Glossary: H
		It is created from hydrogen atoms in the process of nuclear fusion that occurs within stars.
		A lunar crater, a Martian crater, and an asteroid (#2635 Huggins) have been named for William Huggins.
		The lunar Crater Hypatia and Rimae Hypatia were named for her.
	www.zoomschool.com /subjects/astronomy/glossary/indexh.shtml (3033 words)

	Shoestring Astronomy - Lunar 100
		In the April 2004 issue of Sky and Telescope magazine, author Charles A. Wood sets out of list of 100 objects on the moon in his article The Lunar 100.
		They use the proper Latin naming convention for lunar features, so I have included VMA database names in the table as well.
		Another nice feature about their software is that it links you to lunar orbiter photos of the region around most of the objects in their database, providing additional aid in locating these objects.
	www.shoestringastronomy.com /lunar/lunar100.htm (525 words)

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