Comet 81/P WIld
Comet 81/P Wild

Comet Wild 2 is a short periodic comet with an orbital period of 6 years. Before its close encounter with Jupiter during September 1974 his orbit was almost circular and had a 43 year period. But the gravitational pull of the giant gas planet made Wild 2 to a member of the inner solar system. In 2004 the comet was target of the NASA mission "Stardust", which took samples of the coma and returned them back to earth. Our image was obtained during a trip to southern france in February 2010 and shows a nice 1 degree long tail.

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2007 WZ4

was discovered at 0510 UT on 20 Nov. by the Catalina Sky Survey (CSS). The discovery was confirmed by Mount Lemmon Survey MLS and four other observatories. The discovery was announced in MPEC K07W49 on November 21. The size is estimated with approx. 50 meters. It is an Apollo asteroid. Also known as Earth-crossing asteroids, one of three groups of near-Earth asteroids. Apollo group asteroids have semimajor axes greater than 1.0 AU and perihelia less than 1.017 AU (Earth's aphelion distance).

At discovery it was an mag 18.0 bright object and faded to mag 19.3 on November 28 as it now moves further away from earth.

30 short exposures of 20 seconds were taken and stacked to compensate for the motion of the NEO that moved with 2.8"/minute across the sky.

2007 WZ4

2007 WZ4, NEO, 19.3 mag , P.A. 35.5°, 2.82"/min

3 stacks of 600 sec. each, 14 inch Schmidt-Cassegrain, ST8-XME 2x2 binned,
image scale 1.75"/pixel, image center 04h03m35s, +23°16'32"