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Topic: IC 4406

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	Index-Katalog - Wikipedia
		Ursprünglich gab es zwei solcher Kataloge: den Index-Katalog 1 (IC 1) und etwas später den Index-Katalog 2 (IC 2).
		Der IC 1 wurde 1895 veröffentlicht und enthält Astronomische Objekte, die nach der Veröffentlichung des NGC 1888 bis 1895 entdeckt wurden.
		Der IC 2 wurde 1908 veröffentlicht und enthält die Objekte, die zwischen 1895 und 1908 entdeckt wurden.
	de.wikipedia.org /wiki/Index-Katalog (191 words)

	APOD: 2002 June 18 - IC 4406: A Seemingly Square Nebula (Site not responding. Last check: 2007-10-17)
		IC 4406 is likely a hollow cylinder, with its square appearance the result of our vantage point in viewing the
		IC 4406 viewed from the top, it would likely look similar to the Ring Nebula.
		IC 4406 will be a fading white dwarf star.
	antwrp.gsfc.nasa.gov /apod/ap020618.html (134 words)

	Hubble Space Telescope, Thumbnail Views page 3
		IC 349 or Barnard's Merope Nebula: HST has caught the eerie, wispy tendrils of a dark interstellar cloud being destroyed by the passage of one of the stars in the Pleiades star cluster.
		IC 418: Glowing like a multi-faceted jewel, this planetary nebula lies about 2,000 light-years from Earth in the direction of the constellation Lepus and is in the final stage of evolution toward becoming a star similar to our Sun.
		The star at the center of IC 418 was a red giant a few thousand years ago, but then ejected its outer layers into space to form the nebula.
	laughtergenealogy.com /bin/hubble/thumbs03.html (1046 words)

	Hubble Retina Nebula Photo
		A dying star, IC 4406, dubbed the "Retina Nebula" is revealed in this month's Hubble Heritage image.
		Like many other so-called planetary nebulae, IC 4406 exhibits a high degree of symmetry; the left and right halves of the Hubble image are nearly mirror images of the other.
		One of the most interesting features of IC 4406 is the irregular lattice of dark lanes that criss-cross the center of the nebula.
	www.spaceimages.com /nebulaic4406.html (430 words)

	MSFC-02496 - Hubble Space Telescope Image: Planetary Nebula IC 4406 (Site not responding. Last check: 2007-10-17)
		If we could fly around IC 446 in a spaceship, we would see that the gas and dust form a vast donut of material streaming outward from the dying star.
		In fact, IC 4406 is dubbed the "Retina Nebula." The donut of material confines the intense radiation coming from the remnant of the dying star.
		Gas on the inside of the donut is ionized by light from the central star and glows.
	mix.msfc.nasa.gov /ABSTRACTS/MSFC-0203044.html (290 words)

	Lupus - Wikipedia, the free encyclopedia
		Two open clusters are to the south of the constellation, NGC 5822 and NGC 5749.
		On the western border are two spiral galaxies and the Wolf-Rayet planetary nebula IC 4406, containing some of the hottest stars in existence.
		Another planetary nebula, NGC 5882, is towards the centre of the constellation.
	www.wikipedia.org /wiki/Lupus (404 words)

	IC 4406 Dying Star (Site not responding. Last check: 2007-10-17)
		If we could fly around IC 4406 in a spaceship, we would see that the gas and dust form a vast donut of material streaming outward from the dying star.
		We don't see the donut shape in this photograph because we are viewing IC 4406 from the Earth-orbiting Hubble telescope.
		In fact, IC 4406 is dubbed the "Retina Nebula."
	www.inspi.net /hubble-telescope/slides/2002-14.html (142 words)

	IC 4406 (Site not responding. Last check: 2007-10-17)
		The bright central region of IC 4406 is surrounded by an astounding network of filamentary dust features.
		The Planetary Camera chip, in which the nucleus is centered, has a width of 35 arcsec.
		The green speckles on the frame are caused by ``cosmic rays'' that continually bombard the camera.
	www.astro.psu.edu /users/rbc/IC4406.html (49 words)

	Astronomy CD ROM I - Rectangular Planetary Nebula IC 4406 (Site not responding. Last check: 2007-10-17)
		IC 4406 is a planetary nebula with an unusual, almost "rectangular" shape.
		Like the Butterfly Nebula, IC 4406 belongs to the class of bipolar nebulae.
		However, the dark and dusty central band (the "disc-like structure") is less pronounced in this object and the internal structure is more uniform.
	astroa.physics.metu.edu.tr /Astronom/PN/E2198.HTM (160 words)

	Mystery Photo - August 2002
		The object, known as IC 4406, is a planetary nebula - so called because through a small telescope the object appears as a soft green blob, which resembles the planet Uranus.
		The butterfly wings of gas and dust is somewhat of an illusion - a matter of perspective.
		One of the most interesting features of IC 4406 is the irregular lattice of dark lanes that crisscross the center of the nebula.
	www.odysseymagazine.com /pages/mpa/802.html (274 words)

	sciforums.com - Beauty in the eye of the Hubble
		This conundrum comes to light when studying planetary nebulae like IC 4406.
		Evidence indicates that IC 4406 is likely a hollow cylinder, with its square appearance the result of our vantage point in viewing the cylinder from the side.
		In a few million years, the only thing left visible in IC 4406 will be a fading white dwarf star.
	www.sciforums.com /printthread.php?t=8226 (326 words)

	IC 4406: A Seemingly Square Nebula
		This conundrum came to light with the discovery of planetary nebulae like IC 4406.
		The star primarily responsible for this interstellar sculpture can be found in the planetary nebula's center.
		In a few million years, the only thing left visible in IC 4406 will be a fading
	www.astronet.ru /db/xware/msg/1162657 (132 words)

	The Astronomy Connection: Observing the IC?? Naaah
		IC 1805 C+N 02 32.7 +61 27 22 6.5
		IC 2087 RN 04 40.0 +25 45 4
		IC 4954 RN 20 04.8 +29 15 1
	observers.org /tac.mailing.list/2002/May/0225.html (988 words)

	The Disarchy/Premacy Compact, 6690 (Site not responding. Last check: 2007-10-17)
		Following the emergence of a memetic blight near the Retina Nebula (IC 4406), several Disarchy region AI avatars met with relativist Omeg Premacy representatives on their GUT ship The Great Gloit.
		Two hundred years before, the Retina Beholders, a homorph neogen clade, had invited HegRT, a hyperturing madvertising agent, to accompany them to the new colony at GD 00053564, a KO star system 5 light years from the beautiful planetary nebula.
		IC 4406 is 1,600 ly from Sol in Lupus and between the Disarchy and NoCoZo volumes, both prime markets for madvert campaigns.
	www.orionsarm.com /historical/Disarchy-Premacy_Compact.html (380 words)

	BBC NEWS \| Science/Nature \| Hubble's eye in the sky
		Hubble's latest picture in its series of images of dying stars is one of its most remarkable.
		Like many other so-called planetary nebulae, IC 4406 exhibits a marked degree of symmetry; the left and right halves of the Hubble image are very nearly mirror images of each other.
		Researchers say that one of the most interesting features of IC 4406 is the irregular lattice of dark lanes that criss-cross the nebula.
	news.bbc.co.uk /1/low/sci/tech/2144477.stm (388 words)

	Precise Positions for the NGC/IC Planetary Nebulae
		Precise (1" or better) positions have been determined or verified for all the planetary nebulae appearing the NGC and IC catalogues.
		As part of a larger project to improve positions for deep-sky objects, I have collected "best" positions for all the planetaries appearing in the NGC and IC catalogues.
		the object IC 4677 is bright knot in the outer halo to the west, not a background galaxy (MCG +11-22-17).
	www.ngcic.org /papers/plnneb.htm (1979 words)

	Astronomy
		Hubble resolves details on Mars' surface as small as 30 miles across, to reveal craters, vulcanoes, the north polar ice cap, and fleecy white clouds in the thin Martian atmosphere.
		Cas A is the youngest known supernova remnant in our Milky Way Galaxy and resides 10,000 light-years away in the constellation Cassiopeia, so the star actually blew up 10,000 years before the light reached Earth in the late 1600s.
		N44C is the designation for a region of ionized hydrogen gas surrounding an association of young stars in the Large Magellanic Cloud (LMC), a nearby, small companion galaxy to the Milky Way visible from the Southern Hemisphere.
	aboutfacts.net /Astronomy1.htm (1804 words)

	Planetary Nebulae Gallery 13
		The images were obtained with an Apogee AP7 camera mounted on a 24 inch, f/5 reflector.
		IC 4406 In Lupus Using R, V, B filters.
		IC 4406 In Lupus Using I, V, B filters.
	www.blackskies.com /images13a.htm (248 words)

	IC Galaxies Images, Nebula Pictures and Photos Astro Fotos
		IC 694, Galaxy interacting with Ngc3690, Arp 299 ¶¶, Ursa Major
		IC 3050 Spiral Galaxy, CUK Coloured by Astrojan
		IC Galaxies Images Astronomy Galaxy Pictures, Csillag Images Nebulae, csillagos ég Galaxisok, IC Ködök égbolt, Nebulas Astronomie Catalogue Astronomical Clouds Cosmos cocoon, Astronomi Nebula Pictures of seagull Cloud Photos, Kozmikus Csillagászati Asztro Fotók, Astronomien pelican Kozmosz Astro Fotos
	www.biochem.szote.u-szeged.hu /astrojan/ict.htm (144 words)

	Hubble Heritage
		The Hubble Heritage image of IC 4406 was constructed from two separate views with the WFPC2 camera.
		The object has an IC number (Index Catalog), indicating that it was first seen and recorded in the 19th century.
		What the HST has allowed us to do is to see the object in much greater detail and to figure out its 3-D structure.
	heritage.stsci.edu /2002/14/supplemental.html (232 words)

	IC 4406: Una Nebulosa Aparentemente Cuadrada. Imagen Astronómica del día 000416. Traducción al español del APOD/NASA
		Este enigma vino a la luz con el descubrimiento de las nebulosas planetarias como IC 4406.
		IC 4406 es cilíndrica, pero su forma cuadrada resulta del plano de vista que tenemos de este cilindro.
		En unos pocos millones de años más, lo único visible en IC 4406 será una agonizante enana blanca.
	www.astrored.org /astrofotos/apod/index.php/ap000416.html (235 words)

	SPACE.com -- An Eye in Space Looks Back at the Hubble Telescope
		In fact, the picture is of a dying star, one called the Retina Nebula or, officially, IC 4406.
		Most curious about IC 4406 are the dark, web-like strands that make a portion of the nebula look like the retina in a human eye.
		These are lanes of denser gas and dust 160 times wider than the distance from Earth to the Sun.
	www.space.com /scienceastronomy/astronomy/hubble_retina_020613.html (659 words)

	DOC Cape Royal Obs catalogue (Site not responding. Last check: 2007-10-17)
		Several dep-sky objects were discovered at the Royal Observatory, Cape of Good Hope, around the turn of the 20th century.
		R T A Innes and J Lunt both recorded 7 new IC objects, while W H Finlay discovered 3 objects.
		Most of the discoveries were made with the 6- and 7-inch refractors, although the 18- and 24-inch telescopes were also used.
	www.saao.ac.za /assa/html/doc_cape_royal_obs_catalogue.html (190 words)

	IC 4406
		IC 4406 is an unusual-looking planetary nebula in Lupus, about 3 degrees north of the third magnitude star, iota lupii.
		It is listed as 10th magnitude and was an easy object in an 8" telescope.
		The nebula showed a good response to an OIII filter.
	www.montgomerycollege.edu /faculty/~mclark/public_html/i4406c.htm (80 words)

	Astronews (Site not responding. Last check: 2007-10-17)
		Abbreviation: IC The Index Catalogue is a supplement to the New General Catalogue compiled by J L E Drayer in 1895 and a second volume in 1908.
		The Hubble telescope reveals a rainbow of colours in this dying star, called IC 4406.
		In fact, IC 4406 is dubbed the "Retina Nebula." [Hubble Space Telescope Science Institute]
	www.lindoponline.com /alphastro/deep_space/ic.htm (307 words)

	Folha Online - Ciência - Hubble capta imagem de estrela em extinção - 14/06/2002 22h58
		A Nasa (agência espacial norte-americana) divulgou mais uma imagem captada pelo telescópio Hubble: uma estrela em extinção, a IC 4406 - apelidada de "Nebulosa da Retina".
		A foto é na verdade uma composição de duas imagens, a primeira tirada em junho de 2001 e a segunda, em janeiro de 2002, com a câmera planetária e grande-angular do Hubble.
		A IC 4406 exibe um alto grau de simetria.
	www.uol.com.br /folha/ciencia/ult306u6640.shtml (216 words)

	APOD: April 27, 1998 - IC 4406: A Seemingly Square Nebula (Site not responding. Last check: 2007-10-17)
		APOD: April 27, 1998 - IC 4406: A Seemingly Square Nebula
		This conundrum came to light with the discovery of
		IC 4406 is most probably cylindrical, with its square appearance the result of our vantage point in viewing the cylinder.
	antwrp.gsfc.nasa.gov /apod/ap980427.html (129 words)

	TAC: Q on NGC/IC datasets
		IC 4406 - Planetary Nebula in Lupus 11.3
		IC 5148 - Planetary Nebula in Grus 11.3
		Are there any others that have any advantages for visual NGC and IC observing?
	www.observers.org /tac.mailing.list/2000/August/0227.html (571 words)

	(IAAC) Obj: IC 4406 - Inst: 15 inch Obsession f4,5 (Site not responding. Last check: 2007-10-17)
		Subject: (IAAC) Obj: IC 4406 - Inst: 15 inch Obsession f4,5
		At 342x the bright and slightly mottled central part vaguely resembles a 30x25” dumbbell elongated N-S! The E-W axis extends approx 40” and appears extremely faint, visible only with AV.
		Very beautiful planetary that is barely known due to its IC number and low position at —44°.
	www.visualdeepsky.org /logs/msg03928.html (158 words)

	IC 4406: A Seemingly Square Nebula
		Were IC 4406 viewed from the top, it would likely look similar to the
		Publications with keywords: planetary nebula - IC 4406
		Publications with words: planetary nebula - IC 4406
	www.astronet.ru /db/xware/msg/1177394 (148 words)

	Early Results from the Cycle 5 HST\/ Snapshot Survey of Planetary Nebulae (Site not responding. Last check: 2007-10-17)
		This should in turn allow us to calibrate other, indirect distance methods, and thus materially improve the distance scale for PNe.
		We will report a number of new discoveries of visual binaries in PNe, mostly with separations of less than 1'', including the central stars of NGC 650-1 (a resolved triple system), NGC 6309, NGC 7008, IC 4637, A 66, A 74, K 1-22, and Sp 3.
		As a byproduct, the survey produces high-resolution images of the surrounding nebulae, and these have revealed a wealth of new information.
	www.aas.org /publications/baas/v27n4/aas187/S080005.html (205 words)

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