| Discovery[1] | |
|---|---|
| Discovered by | C. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 9 January 1986 |
| Designations | |
| (5899) Jedicke | |
Named after | The Jedicke family: Robert, Peter, and June(Canadian astronomers)[2] |
| 1986 AH · 1978 EW3 1986 AR1 | |
| main-belt · (inner)[1] · Hungaria[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.40 yr (14,024 days) |
| Aphelion | 2.1544AU |
| Perihelion | 1.7029 AU |
| 1.9287 AU | |
| Eccentricity | 0.1171 |
| 2.68yr (978 days) | |
| 14.458° | |
| 0° 22m 4.8s / day | |
| Inclination | 24.006° |
| 125.34° | |
| 263.69° | |
| Knownsatellites | 1[5][6](P: 16.7 h; s; Ds/p ≥ 0.32) |
| Physical characteristics | |
| Dimensions | 2.672±0.172 km[7][8] 3.51 km(calculated)[4] |
| 2.730±0.0004 h[9] 2.7481 h[4] 2.751±0.001 h[10] 3.66h[5] 3.66±0.01 h[11] | |
| 0.30(assumed)[4] 0.621±0.182[7][8] | |
| E[4] | |
| 14.0[7] · 14.2[1][4] · 14.36±0.47[12] | |
5899 Jedicke, provisional designation1986 AH, is abinary[5] Hungariaasteroid approximately 3 kilometers in diameter. It was discovered on 9 January 1986, by American astronomerCarolyn Shoemaker atPalomar Observatory, and named after the members of the Canadian Jedicke family.[2][3]
Jedicke is a brightE-type asteroid and member of theHungaria family, which form the innermost dense concentration of asteroids in theSolar System. It orbits the Sun in theinner main-belt at a distance of 1.7–2.2 AU once every 2 years and 8 months (978 days). Its orbit has aneccentricity of 0.12 and aninclination of 24° with respect to theecliptic.[1]It was first identified as1978 EW3 atCrimea–Nauchnij in 1978, extending the body'sobservation arc by 10 years prior to its official discovery observation at Palomar.[3]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Jedicke ("primary") measures 2.672 kilometers in diameter and its surface has a very highalbedo of 0.621.[7][8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 – a compromise value between 0.4 and 0.2, corresponding to the Hungaria asteroids both as family and orbital group – and calculates a diameter of 3.51 kilometers with anabsolute magnitude of 14.2.[4]
Between February 2010, and April 2016, astronomerBrian Warner obtained several rotationallightcurves ofJedicke from photometric observations at his Palmer Divide Station in Colorado, United States. Best rated lightcurve analysis from March 2013, gave a refinedrotation period of 2.7481 hours with a brightness amplitude of 0.11magnitude,[4][11][9] superseding a preliminary estimate of 3–4 hours.[5] However, an alternative period of 3.076 hours was found again in 2015, without any plausible explanation for a sudden 0.03 hour slowing, that apparently took place between 2011 and 2012 (U=2+/3/2/2+).[10]
During Brian Warner's initial photometric observation in February 2010 – carried out in collaboration with mentor Alan W. Harris at the Space Science Institute in La Canada, California,Petr Pravec atOndřejov Observatory in the Czech Republic, and Joseph T. Pollock at Appalachian State University, North Carolina – it was revealed thatJedicke is a synchronousbinary system with aminor-planet moon orbiting it every 16.7 hours.[5]
Based on the observed mutual eclipse/occultation events, the satellite diameter measures at least 32% of that ofJedicke (i.e. a secondary-to-primary mean-diameter ratio of ≥ 0.32),[5] which translates into a diameter of 0.8–1.1 kilometers, depending on the underling size estimate of its primary. The "Johnstonsarchive" estimates that the moon has asemi-major axis of 4.4 kilometers.[6]
Thisminor planet was named for the Canadian Jedicke family, notablyPeter Jedicke (born 1955),Robert Jedicke (born 1963), andJune Jedicke-Zehr (born 1966). Peter is a retired teacher of astronomy and physics at Fanshawe College, President of theRoyal Astronomical Society of Canada, and one of Canada's best knownamateur astronomers. Robert is a physicist and participant in theSpacewatch survey, who discovered the Jupiter-family comets179P/Jedicke (P/1995 A1) and269P/Jedicke (P/1996 A1).[13][14] June Zehr has often shared observing sessions with her two brothers.[2][15]
Name suggested and citation prepared by Canadian astronomerDavid H. Levy.[2] The approved naming citation was published by theMinor Planet Center on 12 July 1995 (M.P.C. 25444).[16]
