65 Cybele: Difference between revisions
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'''65 Cybele''' ({{pronEng|ˈsɪbɨliː}} {{Respell|SIB|əl-ee}}, or as in Greek ''Κυβέλη)'' is one of the [[List of notable asteroids#Largest by diameter (cis-Neptunian)|largest]] [[asteroid]]s in the [[main belt]]. It gives its name to the [[Cybele asteroid]]s which orbit outward from the Sun from the 2:1 [[orbital resonance]] with [[Jupiter]]. As a [[C-type asteroid]] it is dark in color and [[carbonate|carbonaceous]] in composition. It was discovered on March 8, 1861 by [[Ernst Wilhelm Tempel|Ernst Tempel]] and named after [[Cybele]] the earth goddess. |
'''65 Cybele''' ({{pronEng|ˈsɪbɨliː}} {{Respell|SIB|əl-ee}}, or as in Greek ''Κυβέλη)'' is one of the [[List of notable asteroids#Largest by diameter (cis-Neptunian)|largest]] [[asteroid]]s in the [[main belt]]. It gives its name to the [[Cybele asteroid]]s which orbit outward from the Sun from the 2:1 [[orbital resonance]] with [[Jupiter]]. As a [[C-type asteroid]] it is dark in color and [[carbonate|carbonaceous]] in composition. It was discovered on March 8, 1861 by [[Ernst Wilhelm Tempel|Ernst Tempel]] and named after [[Cybele]] the earth goddess. |
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The first Cybelian stellar [[occultation]] was observed on October 17, 1979 in the [[Soviet Union]]. The asteroid appeared to have an irregular shape, with the longest [[Chord ( |
The first Cybelian stellar [[occultation]] was observed on October 17, 1979 in the [[Soviet Union]]. The asteroid appeared to have an irregular shape, with the longest [[Chord (astronomy)|chord]] being measured as 245 km, closely matching the diameter of 237 km determined by the [[IRAS]] satellite. During the same occultation, a hint of a possible 11 km wide [[natural satellite|satellite]] was detected.<ref name=MPC1980>{{cite web |
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|date=1980-01-04 |
|date=1980-01-04 |
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|title=IAUC 3439: 1979l; Occn OF AGK3 +19 599 BY (65) |
|title=IAUC 3439: 1979l; Occn OF AGK3 +19 599 BY (65) |
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Revision as of 18:28, 11 July 2010
 Star field showing Cybele towards the lower right. | |
| Discovery | |
|---|---|
| Discovered by | Ernst Wilhelm Tempel |
| Discovery date | March 8, 1861 |
| Designations | |
Named after | Cybele |
| Main belt (Cybele) | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 567.544 Gm (3.794 AU) |
| Perihelion | 459.654 Gm (3.073 AU) |
| 513.599 Gm (3.433 AU) | |
| Eccentricity | 0.105 |
| 2323.521 d (6.36 a) | |
Average orbital speed | 16.03 km/s |
| 279.683° | |
| Inclination | 3.548° |
| 155.808° | |
| 105.757° | |
| Physical characteristics | |
| Dimensions | 302×290×232 km[2] 273.0±11.9 km[2] 237.3 km IRAS[1] |
| Mass | 1.78×1019 kg[3] |
Mean density | 2.55±0.22 g/cm³[3] |
| 0.0663 m/s² | |
| 0.1255 km/s | |
| 4.041 h[1] | |
| Albedo | 0.050 ± 0.005[2] 0.071[1] |
| Temperature | ~150 K |
Spectral type | C |
| 10.67 to 13.64 | |
| 6.62[1] | |
65 Cybele (Template:PronEng SIB-əl-ee, or as in Greek Κυβέλη) is one of the largest asteroids in the main belt. It gives its name to the Cybele asteroids which orbit outward from the Sun from the 2:1 orbital resonance with Jupiter. As a C-type asteroid it is dark in color and carbonaceous in composition. It was discovered on March 8, 1861 by Ernst Tempel and named after Cybele the earth goddess.
The first Cybelian stellar occultation was observed on October 17, 1979 in the Soviet Union. The asteroid appeared to have an irregular shape, with the longest chord being measured as 245 km, closely matching the diameter of 237 km determined by the IRAS satellite. During the same occultation, a hint of a possible 11 km wide satellite was detected.[4]
In 1985, Green estimated Cybele to have a diameter of 330 km.[2] In 2004, Müller estimated Cybele using thermophysical modelling (TPM) to have dimensions of 302×290×232 km.[2] The diameter from IRAS observations as listed on JPL was 237.26 km (118.63 km radius).[1]
2009 occultation
On October 11, 2009, Cybele was expected to occult a 13.4 magnitude star in the constellation Aquarius.[5]
References
- ^ a b c d e f "JPL Small-Body Database Browser: 65 Cybele". 2008-08-10 last obs. Retrieved 2008-11-25.
{{cite web}}: Check date values in:|date=(help) - ^ a b c d e Müller, T. G (2004). "65 Cybele in the thermal infrared: Multiple observations and thermophysical analysis". Astronomy and Astrophysics. 418: 347–356. doi:10.1051/0004-6361:20040025.
{{cite journal}}:|access-date=requires|url=(help); Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ a b Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Retrieved 2008-11-28.
- ^ "IAUC 3439: 1979l; Occn OF AGK3 +19 599 BY (65)". MPC (Circular No. 3439). 1980-01-04. Retrieved 2004-06-18.
- ^ Steve Preston. "(65) Cybele / 2UCAC 28838190 event on 2009 Oct 11, 01:30 UT". Retrieved 2009-09-21.
External links
- Orbital simulation from JPL (Java) / Ephemeris