Planet X: Visible SIZE, Estimate Please?

My repeated question to the astronomers on sci.astro is

    HOW LARGE IS THE
    ROUND OBJECT
    IMAGED ON
    JAN 5TH AND 19TH, 2002
    BY
    IMO (MYSTERY MAN) OF (MYSTERY PLACE)
    AND
    PIERRE-ERIC OF HAUTE PROVENCE

as displayed on the images at:
http://www.zetatalk.com/usenet/use90446.htm

Please state this size as:
- a comparison to planet XYZ (visible to amateurs, i.e. Jupiter)
- a number of pixels in diameter when viewed with
  XYZ scope, or XYZ magnification
- as large as XYZ star cluster or galazy, or percent thereof.

Thank you in advance.

Descriptions in 2001
    Feb 7, 2001, Neuchatal observatory, France
        "the astronomer reports that they suspect a comet
         or a brown dwarf on the process to become a
         pulsar since it emits "waves""

    April 1, 2001, Lowell observatory, Flagstaff, AZ
        "there appeared a faint blip not too far off
         center."
        "The operator described the object as diffuse
         and of approximate magnitude 11"

    April 8, 2001, Gordon Macmillan, Vancouver, Ca
        "a darkish, diffuse, round spot, fairly large"