Daphnis appearing as a small dot that causes ripples on the edges of the Keeler Gap in this image from the Cassini probe
Discovery
Discovered by	Cassini Imaging Science Team
Discovered in	May 6, 2005
Orbital characteristics [1]
Semimajor axis	136,504.98±0.02 km
Eccentricity	≈ 0
Orbital period	0.5940800 d
Inclination (to Saturn's equator)	≈ 0°
Is a satellite of	Saturn
Physical characteristics
Mean diameter	6 − 8 km
Mass	5 − 50 ×1013 kg[2]
Mean density	unknown
Surface gravity	unknown
Rotation period	synchronous
Axial tilt	unknown
Albedo	≈ 0.5
Surface temp.	min mean max  ? K ~78 K  ? K
Atmosphere	none

Daphnis (IPA: [ˈdæfnəs], Greek Δαφνίς) is an inner satellite of Saturn. It is also known as Saturn XXXV; its provisional designation was S/2005 S 1^[3][4]. Daphnis is about 6 to 8 kilometres in diameter, and orbits the planet in the Keeler Gap within the A ring. It was named in 2006 after Daphnis, a shepherd, pipes player, and pastoral poet in Greek mythology^[5]. He was the son of Hermes, brother of Pan, and descendant of the Titans. Wikipedia does not have an article with this exact name. ... May 6 is the 126th day of the year (127th in leap years) in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... Two bodies with a slight difference in mass orbiting around a common barycenter. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... A natural satellite is an object that orbits a planet or other body larger than itself and which is not man-made. ... Atmospheric characteristics Atmospheric pressure 140 kPa Hydrogen >93% Helium >5% Methane 0. ... DIAMETER is an AAA protocol (Authentication, Authorization and Accounting) succeeding its predecessor RADIUS. // The name is a pun on the RADIUS protocol, which is the predecessor (a diameter is twice the radius). ... Unsolved problems in physics: What causes anything to have mass? The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. Mass is the property of a physical object that quantifies the amount of matter and energy it is equivalent to. ... The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. It was assigned to the United States in 1889 and is periodically recertified and traceable to the primary international standard, The Kilogram, held at the Bureau International des Poids et... In physics, density is mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: ρ (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg V is... Gravity is a force of attraction that acts between bodies that have mass. ... On a prograde planet like the Earth, the sidereal day is shorter than the solar day. ... In astronomy, synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on its axis as it does to make one orbit; and therefore always keeps the same hemisphere pointed at the body it is orbiting. ... In astronomy, Axial tilt is the inclination angle of a planets rotational axis in relation to a perpendicular to its orbital plane. ... Albedo is the ratio of reflected to incident electromagnetic radiation. ... Fig. ... The kelvin (symbol: K) is a unit increment of temperature and is one of the seven SI base units. ... Atmosphere is the general name for a layer of gases that may surround a material body of sufficient mass. ... Articles with similar titles include the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabet”. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... In astronomy, an inner satellite is a natural satellite following a prograde, low inclination orbit inwards of the large satellites of the parent planet. ... Adjectives: Saturnian Atmosphere Surface pressure: 140 kPa Composition: >93% hydrogen >5% helium 0. ... Image of S/2005 S 1 obtained by Cassini showing the ripples it induces in the edges of the Keeler gap. ... In this image of Saturn, the A Ring is the outer of the two wide rings The A ring is one of the rings of Saturn. ... Sculpture of Pan teaching Daphnis to play the pipes; ca. ... The word mythology (from the Greek μυολογία mythología, from μυολογείν mythologein to relate myths, from μύος mythos, meaning a narrative, and λόγος logos, meaning speech or argument) literally means the (oral) retelling of myths – stories that a particular culture believes to be true and that use the supernatural to interpret natural events and... Hermes bearing the infant Dionysus, by Praxiteles, found at the Heraion, Olympia, 1877 Hermes (Greek, , IPA: ), in Greek mythology, is the Olympian god of boundaries and of the travelers who cross them, of shepherds and cowherds, of orators and wit, of literature and poets, of athletics, of weights and measures... Pan (Greek , genitive ) is the Greek god of shepherds and flocks, of mountain wilds, hunting and rustic music: paein means to pasture. ... In Greek mythology, the Titans (Greek: Titan; plural: Titanes) were a race of powerful deities that ruled during the legendary Golden Age. ...

It was discovered by Carolyn C. Porco and the Cassini Imaging Science Team on May 6, 2005^[3], in six images taken by the Cassini probe over 16 min on May 1 from a time-lapse sequence of 0.180 second narrow-angle-camera exposures of the outer edge of the A ring. It was subsequently found in 32 low-phase images taken of the F ring on April 13 (spanning 18 min) and again in two high-resolution (3.54 km/pixel) low-phase images taken on May 2, when its 7 km disk was resolved. It had previously been inferred from gravitational ripples observed on the outer edge of the Keeler gap. This moon seems to make waves inside the ring. Carolyn C. Porco is an American planetary scientist. ... May 6 is the 126th day of the year (127th in leap years) in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... Cassini-Huygens is a joint NASA/ESA/ASI unmanned space mission intended to study Saturn and its moons. ... It has been suggested that Space probe be merged into this article or section. ... May 1 is the 121st day of the year in the Gregorian calendar (122nd in leap years). ... Close up view of Prometheus and the F Ring Categories: Astronomy stubs | Saturn ... April 13 is the 103rd day of the year (104th in leap years) in the Gregorian calendar. ... This example shows an image with a portion greatly enlarged, in which the individual pixels are rendered as little squares and can easily be seen. ... May 2 is the 122nd day of the year in the Gregorian calendar (123rd in leap years). ... Image of S/2005 S 1 obtained by Cassini showing the ripples it induces in the edges of the Keeler gap. ...

The inclination and eccentricity of Daphnis' orbit are very close to zero, and are not distinguishable from it with present data. Daphnis has an estimated albedo of 50%. Inclination in general is the angle between a reference plane and another plane or axis of direction. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... Albedo is the ratio of reflected to incident electromagnetic radiation. ...

References

2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... May 6 is the 126th day of the year (127th in leap years) in the Gregorian calendar. ... is the 130th day of the year (131st in leap years) in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...

External links

• Daphnis Profile by NASA's Solar System Exploration
• CICLOPS imaging: includes a movie of the moon's ripple effect