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Title: Astronomy/Solar System/Small Bodies/Comets - Comet Information and the International Comet Quarterly From the Smithsonian Astrophysical Observatory. News, observations, orbital data, comet names and designations, links.
Comet_LINEAR Offers report and observations of a breakup of a comet in July 2000.

Comet_Observations Catalogue of images, ordered by comet.

Comet_Section_of_Germany News, observations, analyses of current comets, images, archives, links.

Exploring_The_Planets__Comets History, orbits, composition, ways comets are studied, relation to meteor showers. Comets Halley, Shoemaker-Levy 9. From the National Air and Space Museum.

Glossary Glossary of comet (and astronomical) terms.

How_Stuff_Works__Comet Informative illustrated explanation of what comets are, what they are made of, where they come from and how to observe them.

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Comet Information and the International Comet Quarterly (ICQ)

The ICQ Comet Information Website

Primary and secondary information on comets and observing comets:

This is a key place to begin looking foruseful and accurate information regarding news, observations, orbitaldata, designations and names, and good links regarding comets and relatedtopics [sponsored by the International Comet Quarterly (ICQ)].(Quick aids: Site map 1/Site map 2) Special dated news items:The Edgar Wilson Award for comet discoveries in 2007-2008 has been announced (see IAUC 8962), with two recipients, for one comet. [Earlier Wilson Award recipients.] [9/19/08]The fourth International Workshop on Cometary Astronomy(IWCA IV) was scheduled to be held in the Osaka/Kobe area of Japan on the weekend of 2009 July 25-26, after the July 22 total solar eclipse that will be visible from Asia, but due to lack of international interest in travelling there, it has been cancelled. The location of IWCA IV has now been changed to Shanghai, China, on Thursday, 2009 July 23 (where the path of totality will pass the previous day).We are now looking to hold the fifth IWCA in Rio de Janeiro, Brazil,on Saturday, August 8, at the city planetarium in conjunction with theGeneral Assembly of the International Astronomical Union. More newshere as it becomes available. [10/23/08]The only ground-based-observable comets currently known to be brighter than total visual magnitude 12 are C/2006 OF2 (near total visual mag 10.5-11), C/2006 W3 (near total visual mag 10-11), C/2007 N3 (near total visual mag 8-9), C/2008 A1 (near total visual mag 7), C/2008 J1 (near total visual mag 12),6P (near total visual mag 9),and 19P (near total visual mag 11);and 29P (near total visual mag 10-11). [10/27/08]Comets in urgent need of photometric observation [new webpage added 10/10/05]We are gradually making various articles and data of past published issues of the ICQ available here on the ICQ website.The October 2008 quarterly issue of the ICQ is in preparation.The delayed 2008 Comet Handbook is nearing completion and should be printed by the end of 2008 with ephemeridesfor 2008 and the first half of 2009; the 2009 Comet Handbook will thenbe published in the first half of 2009, and the 2010 version before the endof 2009 to get back on our old schedule. The 14-page July 2008 quarterly issue of the ICQ was mailed out to paying subscribers on 2008 Oct. 27. The 60-page April 2008 quarterly issue of the ICQ was mailed on 2008 Oct. 3. [Other recent ICQ mailing dates.] Special ICQ observing project.Comet 17P/Holmes underwent a huge outburst of some 13-14 magnitudes(the largest ever known for a comet in only a day or two)around 2007 Oct. 24, attaining total visual mag 2.4 +/- 0.2 in thelast week of October. It is only slowly declining in brightness asit moves slowly through the constellation Perseus, well placed fornorthern-hemisphere observers into early 2008. Additionalinformation is available here. [11/10/07]In 2007 April, the CfA changed the first part of its URL from cfa-www to cfa.www. In addition, on 2007 April 19, the Computation Facility at the CfA deleted the unix subdirectory /ps, where all of the ICQ/CBAT/MPC/NELPAG webpages were at one time located (and many were still located at the time of the deletion). The files were all moved to new subdirectories, and in the case of the ICQ webpages, a /icq subdirectory was created so that there is now an /icq part to most or all ICQ webpages. This creates great problems, because it will take many hours (probably spread over many months, realistically, given our other work-load issues) to fix all the broken links in the ICQ webpages (and unfortunately, this goes for the other webpages in our group, as well). If you get such a broken link, try to manually delete out the /ps part of the URL in your web-browser URL-address window and type in /icq instead (for ICQ pages, or /iau for CBAT webpages). Need help? Try our search program.After being visible in broad daylight for several days in the second week of January 2007, comet C/2006 P1 (McNaught) passed its perihelion and was visible to southern-hemisphere observers (only) in the third and fourth weeks of January as a spectacular evening object after sunset, low in the west. Brightness estimates by many observers show this to be the brightest comet observed in over forty years; see also the nice spacecraft images and beautiful southern-hemisphere photographs. Among the very best photos of C/2006 P1 are those by Rob McNaught and Gordon Garradd. ALERT! We have introduced additional screening software to block spam e-mail, due to its prolific increase; it is strongly recommended that those sending e-mail to the ICQ or the CBAT remove ALL html-encoded text, as we cannot read such text easily (we do not use web browsers for reading e-mail) and such text may be deleted by our anti-spam software. (This means: send plain ASCII text *only*, *not* plain ASCII text plus html-encoded text in same message. The vast majority of ICQ contributors have no problem sending ASCII-only e-mail with contributed observations, so HTML-encoding is a natural place to attack SPAM e-mail since the vast majority of SPAM has html-encoding.) [11/14/03]. Due to excessive spam-e-mailing, our Computation Facility took drastic measures on 1998 August 14 to block e-mail from many e-mail extensions. Contributors of cometary observations to the ICQ, the CBAT, and the MPC need to be aware of this: if you do not have a .edu, .gov, or .org extension (chiefly, if your e-mail address has a .com extension), your e-mail may not reach us (and therefore please read this) [8/17/98].There was a computer crash on 2004 June 24 involving the main ICQ disk. While copies of most data are available on other computers, there was a loss of some unpublished (pending) ICQ-formatted data and of some unposted (pending) IAUC/comet-magnitudes-webpage-format data. What is The International Comet Quarterly?Currently-observable comets: ephemerides, elements, and links to magnitude estimatesRecent comet magnitude estimatesBrief introduction to comet magnitudes/photometryDefinition of comet "magnitude"Helpful information on observingfor contributorsICQ formatfor contributorsRecommendations for reference-magnitude sources (to use for comet-magnitude estimates)The most recent observation of each recently observed comet, as reported to the Minor Planet Center (astrometric data, about half of which have magnitudes). Important note: this is compiled from our astrometric archives; listed observations do not mean that they are real -- sometimes bad observations get past the software checks -- and the magnitudes are often off by several magnitudes. Further, the last observation does not mean that the specific comet either does or does not need observation urgently. At any rate, it is suggested that -- for most comets -- observations be made of each comet by each observer once or twice a week, 3-4 observations per night, if possible; more frequent observation by a single observer usually is not warranted or even encouraged -- being better to observe more objects in need of observation. And quality is always better than quantity!The ICQ Comet Handbook, a special annual publication giving orbital elements, ephemerides, predicted brightnesses, and (starting with the 2007 edition) observability/elongation diagrams for comets.The 1997 edition of the ICQ Guide to Observing Comets is now out of print, but we hope to have a revised editionavailable soon. We have had a greatmany requests for this popular item.

Additional information on comets (and related phenomena):

The brightest comets seen since 1935.The brightest comets of the last two centuries:John Bortle's "Bright-Comet Chronicles" are now available at this website.Recent comets noted to have splitObserving comets, and observations of cometsEphemerides/elements for all currently-observable comets Lists and Plots regarding CometsPrimer on Comet Names, Comet Designations, Comet NomenclatureCorrespondence of Old- and New-Style DesignationsPermanent periodic-comet numbers (new-style), in alphabetical order (including the old name-numerals) or in numerical order (without the old name-numerals)How to Report a Comet DiscoveryAstronomical headlines from recent Circulars of the CBAT and MPC.Glossary of comet and astronomical termsIndex to the CBAT/MPC/ICQ pagesIs Pluto a giant comet?CBAT/ICQ press information sheet on C/1995 O1 (Hale-Bopp)Introductory information on comet 153P/2002 C1 (Ikeya-Zhang). [3/26/02; revised 5/20/02]Press release/article on comet C/2006 P1 (McNaught) for use by the news media. [3/27/07]Recommended links to other Websites that contain useful and original comet (and some meteor) material/informationRecommended publications to general information on cometsInformation on atmospheric fireballs (bright meteors) and meteoritesInformation on the scourge of light pollution, and what you can do to help make the sky a better place to view comets in! Some pages were produced and made available here because of the prominence of this problem to cometary observers.

About This Service

Here are credits and auser-feedback form.These pages are light on inline images -- we are considerate of userswho may be accessing these pages over slow (modem) connections! They arealso intended to be text-browser friendly. We arecommitted to keeping our pages accessible to as many browsers as possible(a courtesy that we'd like to see many other webmasters imitate!). Further information is available via e-mail fromicq@cfa.harvard.eduIndex to the CBAT/MPC/ICQ pages. New England Light Pollution Advisory Group (NELPAG) SAO CfA CBAT MPC Valid HTML 4.01!
 

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From the Smithsonian Astrophysical Observatory. News, observations, orbital data, comet names and designations, links.

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