P/2004 V5 (LINEAR-Hill)-A & -B

P/2004 V5 (LINEAR-Hill)-A & -B

formerly P/2003 YM159 (LINEAR-Catalina)

Catalina Sky Survey discovery image 
of P/2004 YM159 from 10 Nov. 2004

Ed Beshore sent this, "a portion of discovery image of P/2003 YM159 (LINEAR-Catalina) from the Catalina Sky Survey. The observer on November 10 was Rik Hill. This is a co-added image (pixels not resampled) of four 30-second exposures." The telescope used is the Catalina Station 0.68 Schmidt, and both components can be seen.

Great Shefford Observatory image 
of P/2004 YM159 from 11 Nov. 2004

This image by Peter Birtwhistle from the morning of 11 November 2004 at Great Shefford Observatory in England shows both objects. He notes for magnitudes component A at m2 = +18.8 and component B m2 = +19.2, and says that "there is a 17th mag galaxy in lower left that I've not been able to identify (via SIMBAD or Guide)." His telescope is a 0.3m Schmidt-Cassegrain, and fifteen 30-second exposures were stacked to obtain this image, which is enlarged 200%.

P/2003 YM159 (LINEAR-Catalina)

An apparently asteroidal object was discovered on 17 December 2003 by LINEAR in New Mexico, which caught it again that month, on the 30th, and then on 8 October 2004. When the Catalina Sky Survey (CSS) looked at this object on 10 November 2004, they found two slightly separated cometary objects, which was announced in 2004-V52 the same day (see A/CC news report).

Peter Birtwhistle has posted a detailed report (expanded since first linked here) about how Brian Marsden at the MPC puzzled out what LINEAR and Catalina Sky Survey had discovered. And he tells A/CC that the Catalina image above "is actually only about 6' west of my image and there is a little bit of overlap — the faint star to the far right of my image fractionally below centre is the star due north of component A in the Catalina image, [and] the bright star to top right in the CSS image, cut in half by the border, is fully visible in mine as the brightest star in the top right hand part of the image."

15 November update:  MPEC 2004-V79 announces that this comet has been redesignated and renamed P/2004 V5 (LINEAR-Hill). The resignation takes care of a big problem in reporting data for individual components (see explanation)

History: This page was first posted on 6 November 2004, and was updated the next day and again on the 15th.

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