International Comet Quarterly

We will be adding some pre-publication items here because of their urgency or time-sensitive nature for observers. Such items available so far:

• "Forward-Scattering Enhancement of Comet Brightness. III. Prospects for C/2010 X1 (Elenin) as Viewed from the Earth and the SOHO, STEREO-A, and STEREO-B Spacecraft", by Joseph N. Marcus (pdf file available here). (posted 8/3/11)
• "Comet 169P/NEAT: Prospects for Forward-Scattering Brightness Enhancement in December 2009 and Visual Observation of the Bare Nucleus as Early as Mid-January 2010", by Joseph N. Marcus (pdf file available here). [also, scanned images of individual pages: page 1 / page 2 / page 3 / page 4 / page 5 / page 6 / page 7 / page 8 ] (posted 12/15/09)

Starting in late 2006, we are posting the full tabulated list of photometric observations at the time of publication of the regularly quarterly issues of the ICQ, at this separate webpage.

We are gradually adding other published ICQ articles to this website. Those available so far:

• "Recurrence of Super-Massive Explosions and Orbital Evolution of Comet 17P/Holmes: II. Search for Historical Records, and Outlook for Future Research", by Zdenek Sekanina (2010), ICQ 32, 3-32 first half (pp. 3-15) [59-MB pdf file]; second half (pp. 16-32) [73-MB pdf file].
• "Crystallization of Gas-Laden Amorphous Water Ice, Activated by Heat Transport to its Subsurface Reservoirs, as Trigger of Huge Explosions of Comet 17P/Holmes", by Zdenek Sekanina (2009), ICQ 31, 99-124 [2.5-MB pdf file].
• "Comets for the Visual Observer in 2010", by Alan Hale (2009), ICQ 31, 84-86 [2.2-MB pdf file].
• "Recurrence of Super-Massive Explosions and Orbital Evolution of Comet 17P/Holmes: I. Missed 1913-1957 Returns to the Sun", by Zdenek Sekanina (2009), ICQ 31, 45-65 [4.3-MB pdf file].
• "Comet 17P/Holmes: A Megaburst Survivor", by Zdenek Sekanina (2009), ICQ 31, 5-23 [6.7-MB pdf file].
• "Unpublished Observations of the Eclipse Comet, C/1948 V1", by F. Lancaster Hiett, Michael Saladyga, and Thomas R. Williams (2008), ICQ 30, 140- 141 [jpeg files].
• "Palestinian Observations of the Comet of 1577", by S. M. Silverman (2008), ICQ 30, 123-124. [postscript file].
• "On a Forgotten 1836 Explosion from Halley's Comet, Reminiscent of 17P/Holmes' Outbursts", by Zdenek Sekanina (2008), ICQ 30, 63-74 [1.3-MB pdf file].
• "Exploding Comet 17P/Holmes", by Zdenek Sekanina (2008), ICQ 30, 3-28 (includes 1-page tabulation of ``Photometry of Deep-Sky Objects" of relevance) [large, 41-MB pdf file]. Correction to the printed text in the last paragraph of text on page 26, line 3 (before the Acknowledgements): FOR terrain, one by is an efficient READ terrain, one by one, is an efficient
• "Forward-Scattering Enhancement of Comet Brightness. II. The Light Curve of C/2006 P1", by Joseph N. Marcus (2007), ICQ 29, 119-130 [1.3-MB pdf file].
• "Forward-Scattering Enhancement of Comet Brightness. I. Background and Model", by Joseph N. Marcus (2007), ICQ 29, 39-66 [WARNING: very large pdf file (50 megabytes)].
• "Halley's First Name: Edmond or Edmund", by David W. Hughes and Daniel W. E. Green (2007), ICQ 29, 7-14 [938-kB pdf file].
• "Charles Messier, Napoleon, and Comet C/1769 P1", by Maik Meyer (2007), ICQ 29, 3-6 [533-kB pdf file].
• "Comet 73P/Schwassmann-Wachmann: Nucleus Fragmentation, Its Light-Curve Signature, and Close Approach to Earth in 2006", by Zdenek Sekanina (2005), ICQ 27, 225-240 [1.85-MB pdf file].
• "The Comet of 1577 and a Turkish-Ottoman Astronomer", by Haldun I. Menali and Ahmed Suheyl Unver (2004), ICQ 26, 3-7 [offsite html webpage pointing to gif images of each individual article page].
• "What Happened to Comet C/2002 O4 (Hoenig)?", by Zdenek Sekanina (2002), ICQ 24, 223-236 [64-MB pdf file].
• Primer on CCD photometry of comets, from the ICQ's 1997 Guide to Observing Comets, pp. 94-104 [html page].
• "New Designations for Old", by Brian G. Marsden (1995), ICQ 17, 3-6 [pdf version of entire 4-page article] ; ICQ 17, 3 [gif/html page; only the first page of four total].
• "Magnitude Corrections for Atmospheric Extinction", by Daniel W. E. Green (1992), ICQ 14, 55-59 [html page].
• "Some Thoughts on Limiting Visual Stellar and Cometary Magnitudes with Various Apertures", by Daniel W. E. Green (1985), ICQ 7, 40-46 [scanned images of individual pages: page 40 / page 41 / page 42 / page 43 / page 44 / page 45 / page 46 /

Below are representative non-"paper" sections in pdf format, to show how they appear in print:

• "Descriptive Information, to Complement the Tabulated Data", with illustrations, in the January 2007 issue: ICQ 29, 14-22 [1.6-MB pdf file].
• Cover page and editorial-information page for January 2008 issue: ICQ 30, 1-2 [158.5-kB pdf file].
• "Descriptive Information, to Complement the Tabulated Data", with illustrations, in the January 2008 issue: ICQ 30, 30-46 [large, high-resolution, 40-MB pdf file].
• Tabulated summaries of photometric data for January 2008 issue (the full tabulated data of which appear at this separate webpage): ICQ 30, 47-60 [665-kB pdf file].

[last updated 9/8/10]