_Cole.png) Shape model ofCole from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | S. J. Bus |
| Discovery site | Siding Spring Obs. |
| Discovery date | 2 March 1981 |
| Designations | |
| (5635) Cole | |
Named after | Joshua Cole[1] (fictional character) |
| 1981 ER5 · 1986 XC5 1988 CO5 | |
| main-belt[1][2] · (inner) background[3] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 37.20yr (13,588 d) |
| Aphelion | 3.0272AU |
| Perihelion | 1.7431 AU |
| 2.3851 AU | |
| Eccentricity | 0.2692 |
| 3.68 yr (1,345 d) | |
| 248.82° | |
| 0° 16m 3.36s / day | |
| Inclination | 7.3102° |
| 274.08° | |
| 54.118° | |
| Physical characteristics | |
| 3.51±0.80 km[4] 4.263±0.620 km[5][6] 4.71 km(calculated)[7] | |
| 5.792±0.001 h[8] 5.7937±0.0001 h[9] | |
| 0.20(assumed)[7] 0.29±0.14[4] 0.294±0.100[5][6] | |
| S(assumed)[7] LS(SDSS-MOC)[10] | |
| 13.8[6] 14.0[2][7] 14.33[4] | |
5635 Cole (prov. designation:1981 ER5) is abackground asteroid from the inner regions of theasteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 2 March 1981, by American astronomerSchelte Bus at theSiding Spring Observatory in Australia.[1] TheL/S-type asteroid has arotation period of 5.79 hours.[7] It was named after the fictional characterJoshua Cole.[1]
Cole is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[3] It orbits the Sun in theinner main-belt at a distance of 1.7–3.0 AU once every 3 years and 8 months (1,345 days;semi-major axis of 2.39 AU). Its orbit has aneccentricity of 0.27 and aninclination of 7° with respect to theecliptic.[2] The body'sobservation arc begins with aprecovery taken at the discovering Siding Spring Observatory on 9 February 1981, or four weeks prior to its official discovery observation.[1]
Thisminor planet was named after fictional characterJoshua Cole in the novelCole of Spyglass Mountain (1923) byArthur Preston Hankins. The protagonist, reminiscent of Oliver Twist, is an amateur astronomer in a dystopian society where boys receive numbers instead of names. In the novel, Cole's number isList of minor planets: 5001–6000#635 and corresponds to this asteroid's numbering.[1] The official naming citation was prepared byDavid H. Levy and published by theMinor Planet Center on 14 December 1997 (M.P.C. 31024).[11]
In the Moving Object Catalog of theSloan Digital Sky Survey,Cole has aspectral type is closest to anL-type asteroid followed by the common, stonyS-type.[10] TheCollaborative Asteroid Lightcurve Link also assume it to be an S-type asteroid.[7]
In September 2004, two rotationallightcurves ofCole were obtained fromphotometric observations byDonald Pray,Silvano Casulli,René Roy. Lightcurve analysis gave a well-definedrotation period of 5.792 and 5.7937 hours with a brightness amplitude of 0.33 and 0.30magnitude, respectively (U=3/3).[8][9]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Cole measures between 3.51 and 4.263 kilometers in diameter and its surface has analbedo between 0.29 and 0.294,[4][5][6] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroids of 0.20, and calculates a diameter of 4.71 kilometers based on anabsolute magnitude of 14.0.[7]
