| 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).