Back 60558 Echeclus (كويكب) ARZ (60558) Echeclus Catalan (60558) Echeclus German 60558 Έχεκλος Greek 60558 Ekeklo Esperanto (60558) Equeclo Spanish سیارک ۶۰۵۵۸ Persian 60558 Echeclus Finnish (60558) Échéclos French 60558 Eheklo Croatian
| Discovery | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak Obs. |
| Discovery date | 3 March 2000 |
| Designations | |
| (60558) Echeclus | |
| Pronunciation | /ˈɛkɪkləs/ |
Named after | Ἔχεκλος Ekheklos |
| 2000 EC98, 2002 GJ27 | |
| Centaur | |
| Symbol | .svg){kind=small} (astrological) |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 13264 days (36.31 yr) |
| Aphelion | 15.544 AU (2.3253 Tm) |
| Perihelion | 5.8168 AU (870.18 Gm) |
| 10.680 AU (1.5977 Tm) | |
| Eccentricity | 0.45537 |
| 34.90 yr (12749 d) | |
Average orbital speed | 8.58 km/s |
| 7.51102° | |
| 0° 1m 41.657s / day | |
| Inclination | 4.3445° |
| 173.335° | |
| 162.889° | |
| Jupiter MOID | 0.838867 AU (125.4927 Gm) |
| TJupiter | 3.031 |
| Proper orbital elements | |
Proper mean motion | 0.0282 deg / yr |
Proper orbital period | 12765.95745 yr (4662765.957 d) |
| Physical characteristics | |
| 84 km[2][3] | |
| 26.802 h (1.1168 d)[1] | |
| 0.04[3] | |
| Temperature | ~85 K |
| B–V = 0.841±0.072[4] V–R = 0.502±0.065[4] | |
| ~18.8[5] | |
| 9.6[1] | |
60558 Echeclus /ˈɛkɪkləs/ is a centaur, approximately 84 kilometers (52 miles) in diameter, located in the outer Solar System. It was discovered by Spacewatch in 2000 and initially classified as a minor planet with provisional designation 2000 EC98 (also written 2000 EC98). Research in 2001 by Rousselot and Petit at the Besançon observatory in France indicated that it was not a comet, but in December 2005 a cometary coma was detected. In early 2006[6] the Committee on Small Bodies Nomenclature (CSBN) gave it the cometary designation 174P/Echeclus. It last came to perihelion in April 2015,[1] and was expected to reach about apparent magnitude 16.7 near opposition in September 2015.[7]
- ^ a b c d "60558 Echeclus (2000 EC98)". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2060558. Retrieved 12 April 2016.
- ^ Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Archived from the original on 16 December 2006. Retrieved 2006-12-26.
- ^ a b John Stansberry; Will Grundy; Mike Brown; Dale Cruikshank; John Spencer; David Trilling; Jean-Luc Margot (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". arXiv:astro-ph/0702538.
- ^ a b Cite error: The named reference
Hainaut-2012was invoked but never defined (see the help page). - ^ "AstDys (60558) Echeclus Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2010-06-28.
- ^ "Homepage of the VdS-Fachgruppe Kometen". Archived from the original on 24 April 2006. Retrieved 2006-04-18.
- ^ Cite error: The named reference
MPC-ephwas invoked but never defined (see the help page).