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Topic: NGC 7293

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Helix Nebula

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Helix Nebula

	IAAC Observations Matching Your Criteria
		(IAAC) Obj: NGC 6318 - Inst: Orion 6" Dob
		(IAAC) Obj: NGC 6522 - Inst: Orion 6" Dob
		(IAAC) Obj: SN 1999by in NGC 2841 - Inst: Meade LX10 8" SCT
	www.visualdeepsky.org /search.cgi?catalogs=NGC&ids=7293 (12507 words)

	NebulaeDrawings (Site not responding. Last check: 2007-10-14)
		NGC 6960 (shown here) is highlighted by 52-Cygni, a bright straw-colored foreground star that lends itself as an eye-catching accessory.
		The Cone Nebula is associated with Open Cluster NGC 2264, which is referred to as The Christmas Tree Cluster.
		It was given two NGC designations because (in small telescopes) its bi-lobed structure gives the appearance of two distinctly separate objects.
	www.belmontnc.4dw.net /nebulae.htm (2949 words)

	Online dictionary - Helix Nebula
		The Helix Nebula (NGC 7293) is one of the closest planetary nebulae to Earth.
		It lies 140 parsecs or 450 light-years from Earth in the Aquarius constellation and has an angular diameter of about 0.5°.
		Recent pictures of Helix are a composite of newly released images from the ACS instrument on the Hubble Space Telescope and wide-angle images from the Mosaic Camera on the WIYN 0.9-m Telescope at Kitt Peak National Observatory.
	fact-archive.com /encyclopedia/NGC_7293 (186 words)

	Aquarius
		There are two deep sky objects which is on the Messier catalog, the globular cluster M72 and the open cluster M73.
		Two planetary nebulae are found in Aquarius: NGC 7009, called the Saturn Nebula due to its resemblance to the planet, to the southeast of η Aquarii; and NGC 7293, the famous Helix Nebula, southwest of δ Aquarii.
		The constellation was immortalized in the 1960s, proclaimed the Age of Aquarius.
	www.brainyencyclopedia.com /encyclopedia/a/aq/aquarius.html (353 words)

	DOC NGC 7293 Helix Nebula (Site not responding. Last check: 2007-10-14)
		The NGC notes that it was observed by Harding, and describes it as "remarkable, pretty faint, very large, elongated or bi-nuclear."
		Hence the description in the NGC "vF" is either incorrect or the nebula is variable; probably variable, for it is not easy to see how such a conspicuous object should have been missed by Messier and the Herschels."
		NGC 7293 is not a spiral; it is also included in Class III [diffuse nebulae], where it properly belongs [earlier authors had listed in as Class I.(c) — Known to be spirals.]
	www.saao.ac.za /assa/html/doc_ngc_7293_helix_nebula.html (703 words)

	Kaler Vita (Site not responding. Last check: 2007-10-14)
		"The Spectrum of the Non-Thermal Planetary Nebula NGC 3242," S.J. yzak, J.B. Kaler, D.J. Faulkner, and L.H. Aller, AstronomicalJournal, 70, 672, 1965 (abstract).
		The Irregular Planetary Nebula NGC 2440," L.H. Aller, S.J. yzak, and J. Kaler, Astrophysical Journal, 151, 187, 1968.
		The Moderate Excitation Planetary NGC 6826," S.J. yzak, L.H. Aller, and J. Kaler, Astrophysical Journal, 168, 405, 1971.
	www.astro.uiuc.edu /~kaler/pub.html (5203 words)

	NGC 7293 - Helix Nebula (Site not responding. Last check: 2007-10-14)
		NGC 7293, the Helix, or Helical Nebula, is the largest planetary nebula in the sky.
		It measures nearly 13 arcminutes in diameter, thus covering an area of about 1/5th the size of the full moon, and shines at the photographic magnitude 6.5, which makes it also the brightest planetary nebula in the sky.
		The film is not good in recording the greenish color of the nebula's central hole.
	www.nightsky.at /Photo/PN/Helix_APO.html (240 words)

	Gas-phase models for the evolved planetary nebulae NGC 6781, M4-9 and NGC 7293 (ResearchIndex)
		Gas-phase models for the evolved planetary nebulae NGC 6781, M4-9 and NGC 7293
		Three pseudo-time-dependent gas-phase models have been constructed for dense 10 4 --10 5 cm 23 and cool T, 15 K clumpy envelopes of the evolved nebulae NGC 6781, M4-9 and NGC 7293.
		The three nebulae are modelled as carbon-rich stars evolved from the asymptotic giant branch to the late planetary nebula phase.
	citeseer.ist.psu.edu /485379.html (222 words)

	Helix Nebula NGC 7293 - Night Sky Nation (Site not responding. Last check: 2007-10-14)
		UNIVERSE : NEBULAE : HELIX NEBULA NGC 7293
		This photograph of the coil-shaped Helix Nebula NGC 7296 is one of the largest and most detailed celestial images ever made.
		The composite picture is a seamless blend of ultra-sharp images from NASA's Hubble Space Telescope combined with the wide view of the Mosaic Camera on the National Science Foundation's 0.9-meter telescope at Kitt Peak National Observatory near Tucson, Ariz.
	www.nightskynation.com /universe/nebulae/helix+nebula+NGC+7293 (136 words)

	NGC 7293: The Helix Nebula
		The remnant central stellar core, destined to become a white dwarf star, glows in light so energetic it causes the previously expelled gas to fluoresce.
		The Helix Nebula, given a technical designation of NGC 7293, lies about 650 light-years away towards the constellation of Aquarius and spans about 2.5 light-years.
		The above picture is a composite of newly released images from the ACS instrument on the
	www.astronet.ru /db/xware/msg/1190113 (190 words)

	NGC 7293
		Distance - Estimated to be less than 300 light years,
		Description: NGC 7293 is commonly believed to be the nearest planetary nebula to us at approximately 300 light years.
		It is a large object [approximately 1/2 the apparent size of the new moon] that can be seen with binoculars from a dark sky site.
	home.earthlink.net /~deanjacobsen/ngc7293.html (175 words)

	NGC 7293: The Helix Nebula
		Explanation: The Helix nebula (New General Catalog number 7293) is estimated to be a mere 450 light-years from the Sun, in the direction of the constellation Aquarius.
		At that distance it may well be the closest planetary nebula, offering a dramatic snapshot of a brief final evolutionary stage in the life of a solar-type star.
		Publications with keywords: Helix Nebula - NGC 7293
	www.astronet.ru /db/xware/msg/1161782 (195 words)

	NGC 7293, the Helix Nebula
		Planetary Nebula NGC 7293 (= Bennett 129) in Aquarius
		The Helix Nebula is one of the closest of all planetary nebulae: Lying at a distance of perhaps 450 light years, it is the only planetary nebula for which a parallax could be obtained by ground-based observations.
		Bill Arnett's Helix Nebula NGC 7293 photo page, info page.
	www.seds.org /messier/xtra/ngc/n7293.html (246 words)

	APOD: 2003 May 10 - NGC 7293: The Helix Nebula (Site not responding. Last check: 2007-10-14)
		APOD: 2003 May 10 - NGC 7293: The Helix Nebula
		Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
		Helix Nebula, given a technical designation of NGC 7293, lies about 650
	antwrp.gsfc.nasa.gov /apod/ap030510.html (152 words)

	Todd's Heavenly Bodies -- NGC 7293 The Helix Nebula (Site not responding. Last check: 2007-10-14)
		Todd's Heavenly Bodies -- NGC 7293 The Helix Nebula
		Easily found at low power sweeping through southern Aquarius, but much more difficult to see at higher powers.
		This is perhaps the best example of a large diffuse planetary nebula, most enjoyable!
	www.comnet.ca /~nowlan/heaven/other/NGC7293.htm (73 words)

	(IAAC) Obj: NGC 7293 (Helix nebula) - Inst: 9x63 binoculars (Site not responding. Last check: 2007-10-14)
		Subject: (IAAC) Obj: NGC 7293 (Helix nebula) - Inst: 9x63 binoculars
		Prev: (IAAC) Obj: NGC 7009 (Saturn nebula) - Inst: 9x63 binoculars
		Next: (IAAC) Obj: NGC 6822 Negative report - Inst: 9x63 binoculars
	www.visualdeepsky.org /netastrocatalog/msg04448.html (104 words)

	Caldwell 63 / NGC 7293 - Planetary Nebula in Aquarius (Site not responding. Last check: 2007-10-14)
		Caldwell 63 / NGC 7293 - Planetary Nebula in Aquarius
		Huge 10' planetary with quite obvious rich structure.
		Brightenings in the N anD S side of the ring.
	www.kolumbus.fi /jaakko.saloranta/Deepsky/Caldwell/Caldwell63.html (28 words)

	DVD Talk Forum - Space pic: NGC 7293: The Helix Nebula (Site not responding. Last check: 2007-10-14)
		DVD Talk Forum > Archives > Archives > Other Archive > Space pic: NGC 7293: The Helix Nebula
		View Full Version : Space pic: NGC 7293: The Helix Nebula
		The above picture is a composite of newly released images from the ACS instrument on the Hubble Space Telescope and wide-angle images from the Mosaic Camera on the 0.9-m Telescope at Kitt Peak National Observatory.
	www.dvdtalk.com /forum/archive/index.php/t-291557.html (262 words)

	The Helix nebula, NGC 7293 (Site not responding. Last check: 2007-10-14)
		Entry from NGC 2000.0 (R.W. Sinnott, Ed.) © Sky Publishing Corporation, 1988:
		NGC 7293 Pl 22 29.6 -20 48 s Aqr 12.8 !
		The Helix nebula, wide field, no unsharp mask
	www.aao.gov.au /images/captions/aat015.html (185 words)

	Untitled Document
		Veil, M101, NGC 6946, M51, M81-M82, Virgo Cluster, NGC 891,
		M31(cover), NGC 1977, NGC 281, NGC 6559, Cone Nebula
		Rosette Nebula, The Moon, M42, M81, Pelican Nebula, Heart of Orion, The Sun
	www.robgendlerastropics.com /publications.html (101 words)

	The Helix Nebula (NGC 7293) (Site not responding. Last check: 2007-10-14)
		The Helix Nebula (NGC 7293) is the closest planetary nebula to our Solar System, at about 690 light years away (although the distance is still a subject of some dispute).
		It is also the largest known, covering about half the apparent size of the moon.
		All files associated with The Constellations Web Page are
	www.dibonsmith.com /ngc7293.htm (149 words)

	Best of AOP: NGC 7293 - The Helix Nebula
		Best of AOP: NGC 7293 - The Helix Nebula
		At a distance of 450 light years away, this gas bubble released by a dying star is the closest of its type.
		Would you like to take images like this?
	www.noao.edu /outreach/nop/advanced/observers/helix.html (250 words)

	Planetary Thumbnails For Autumn's Best PN's
		Click on thumbnail image to view a 300 x 300 image
		With the exceptions of Pease 1 and NGC 7293, the scale for each image
		For NGC 7293 (Helix Nebula), the scale is 15
	www.blackskies.com /sb4images.htm (57 words)

	PUBLICATIONS
		Leahy, D.A., Zhang, C.Y., and Kwok, S. Two Component X-ray Emission from the Planetary Nebula NGC 7293,
		Hasegawa, T.I., Volk, K., and Kwok, S. A Chemical Model of the Neutral Envelope of the Planetary Nebula NGC 7027,
		Hasegawa, T.I. and Kwok, S. Molecular Line Emissions from the Photodissociation Region of NGC 7027, Astrophys.
	www.iras.ucalgary.ca /~kwok/publication.html (2838 words)

	LHEA: Publications 2000-2001 (Site not responding. Last check: 2007-10-14)
		Guerrero, M.A., Chu, Y.-H., Gruendl, R.A., Williams, R.M., Kaler, J.B. "The Enigmatic X-ray Point Sources at the Central Stars of NGC 6543 and NGC 7293," ApJL, 553, 55
		Kraemer, S.B., Crenshaw, D.M., Hutchings, J.B., George, I.M., Danks, A.C., Gull, T.R., Kaiser, M.E., Nelson, C.H., Weistrop, D., Vieira, G.L. 2001, "Space Telescope Imaging Spectrograph Echelle Observations of the Seyfert Galaxy NGC 4151: Physical Conditions in the Ultraviolet Absorbers," ApJ, 551, 671
		Strickland, D.K., Heckman, T.M., Weaver, K.A., Dahlem, M. 2000, "Chandra Observations of NGC 253: New Insights into the Nature of Starburst-Driven Superwinds," AJ, 120, 296
	universe.gsfc.nasa.gov /reports_pubs/2001/publist.html (3778 words)

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