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Original Caption Released with Image:

This collection of Cassini images provides context for understanding the location and scale of propeller-shaped features observed within Saturn's A ring.

Careful analysis of the highest resolution images taken by Cassini's cameras as the spacecraft slipped into Saturn orbit revealed the four faint, propeller-shaped double-streaks in an otherwise bland part of the mid-A ring. Imaging scientists believe the "propellers" provide the first direct observation of the dynamical effects of moonlets approximately 100 meters (300 feet) in diameter. The propeller moonlets represent a hitherto unseen size-class of particles orbiting within the rings.

The left-hand panel provides broad context within the rings, and shows the B ring, Cassini Division, A ring and F ring. Image scale in the radial, or outward from Saturn, direction is about 45 kilometers (28 miles) per pixel; because the rings are viewed at an angle, the image scale in the longitudinal, or circumferential, direction is several times greater.

The center image is a closer view of the A ring, showing the radial locations where propeller features were spotted. The view is approximately 1,800 kilometers (1,100 miles) across from top to bottom and includes a large density wave at bottom (caused by the moons Janus and Epimetheus), as well as two smaller density waves. The footprints of the propeller discovery images are between density waves, in bland, quiescent regions of the ring.

The propellers appear as double dashes in the two close-up discovery images at the right and are circled. The unseen moonlets, each roughly the size of a football field, lie in the center of each structure. These two images were taken during Saturn orbit insertion on July 1, 2004, and are presented here at one-half scale. Resolution in the original images was 52 meters (171 feet) per pixel. The horizontal lines in the image represent electronic noise and do not correspond to ring features.

The propellers are about 5 kilometers (3 miles) long from tip to tip, and the radial offset (the "leading" dash is slightly closer to Saturn) is about 300 meters (1,000 feet).

The propeller structures are unchanged as they orbit the planet. In that way, they are much like the wave pattern that trails after a speedboat as it skims across a smooth lake. Such a pattern is hard to discern in a choppy sea. In much the same way, scientists think other effects may be preventing Cassini from seeing the propellers except in very bland parts of the rings.

	Bu dosya NASA tarafından üretildiği için kamu malıdır. Aksi belirtilmediği sürece "NASA tarafından üretilen malzemenin telif hakkı olmadığı" NASA telif politikasında belirtilmiştir. (Bkz. Template:PD-USGov, NASA copyright policy page veya JPL Image Use Policy.)
	Uyarılar: NASA logoları, işaret ve amblemlerinin kullanımı ABD yasaları uyarınca sınırlandırılmıştır 14 CFR 1221. NASA internet sitesi, Sovyet / Rus uzay ajansı ve diğer sivil ABD uzay ajanslarına ait çok sayıda görüntü barındırmaktadır. Bunların bazıları kamu malı olmayabilir. Bunlardan STScI tarafından üretildiği açıkça belirtilmeyen, Hubble Uzay Teleskobuna dayalı verilerin telif hakkı saklı olabilir.[1] Ayrıca bakınız {{PD-Hubble}} ve {{Cc-Hubble}} veya {{Spacetelescope.org}}. SOHO (ESA & NASA) ortak projesi olan prob tarafından oluşturulan tüm materyallerin telif hakkı saklıdır ve ticari olmayan eğitim amaçlı kullanım için izin alınması gerektiği anlamına gelmektedir. [2] Özellikle Günün Astronomi Görüntülerinin (APOD) internet sitesinde telif hakkı saklı olabilir. [3]