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'''Daphnis''' ({{IPA2|ˈdæfnəs}}, Greek ''Δαφνίς)'' is an [[inner satellite]] of [[Saturn]]. It is also known as '''{{nowrap|Saturn XXXV}}'''; its provisional designation was '''{{nowrap|S/2005 S 1}}'''<ref name="IAUC8524">[http://cfa-www.harvard.edu/iauc/08500/08524.html IAUC 8524: ''S/2005 S 1''] [[2005]] [[May 6]] (discovery)</ref><ref>Martinez, C.; and Dyches, P.; [http://www.nasa.gov/mission_pages/cassini/media/cassini-051005.html Cassini-Huygens: ''Cassini Finds New Saturn Moon That Makes Waves''] [[May 10]] [[2005]]</ref>. 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|Greek]] [[mythology]]<ref>[http://www.greatbritainonline.co.uk/IAUC-8730.pdf IAUC 8730: ''Saturn XXXV (Daphnis)''] (naming the moon)</ref>. He was the son of [[Hermes]], brother of [[Pan (mythology)|Pan]], and descendant of the [[Titan (mythology)|Titans]]. |
'''Daphnis''' ({{IPA2|ˈdæfnəs}}, Greek ''Δαφνίς)'' is an [[inner satellite]] of [[Saturn]]. It is also known as '''{{nowrap|Saturn XXXV}}'''; its provisional designation was '''{{nowrap|S/2005 S 1}}'''<ref name="IAUC8524">[http://cfa-www.harvard.edu/iauc/08500/08524.html IAUC 8524: ''S/2005 S 1''] [[2005]] [[May 6]] (discovery)</ref><ref>Martinez, C.; and Dyches, P.; [http://www.nasa.gov/mission_pages/cassini/media/cassini-051005.html Cassini-Huygens: ''Cassini Finds New Saturn Moon That Makes Waves''] [[May 10]] [[2005]]</ref>. 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|Greek]] [[mythology]]<ref>[http://www.greatbritainonline.co.uk/IAUC-8730.pdf IAUC 8730: ''Saturn XXXV (Daphnis)''] (naming the moon)</ref>. He was the son of [[Hermes]], brother of [[Pan (mythology)|Pan]], and descendant of the [[Titan (mythology)|Titans]]. |
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It was discovered by [[Carolyn C. Porco]] and the [[Cassini Imaging Science Team]] on [[May 6]], [[2005]]<ref name="IAUC8524"/>, in six images taken by the ''[[Cassini-Huygens|Cassini]]'' [[unmanned space mission|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. |
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The [[inclination]] and [[eccentricity (orbit)|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%. |
The [[inclination]] and [[eccentricity (orbit)|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%. |
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Revision as of 18:30, 16 June 2007
 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. |
| ||||||
| 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.
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.
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%.
References
- ^ Spitale, J. N.; et al. (2006). "The orbits of Saturn's small satellites derived from combined historic and Cassini imaging observations". The Astronomical Journal. 132: 692.
{{cite journal}}: Explicit use of et al. in:|author=(help) - ^ Based on diameters and density 0.5 - 2 g/cm³
- ^ a b IAUC 8524: S/2005 S 1 2005 May 6 (discovery)
- ^ Martinez, C.; and Dyches, P.; Cassini-Huygens: Cassini Finds New Saturn Moon That Makes Waves May 10 2005
- ^ IAUC 8730: Saturn XXXV (Daphnis) (naming the moon)