_Marilyn.png) Shape ofMarilyn modelled from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | E. Delporte |
| Discovery site | Uccle Obs. |
| Discovery date | 23 August 1938 |
| Designations | |
| (1486) Marilyn | |
Named after | Marilyn Herget[2] (daughter of astronomer) Paul Herget |
| 1938 QA | |
| main-belt · (inner)[3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 79.11 yr (28,894 days) |
| Aphelion | 2.4725AU |
| Perihelion | 1.9245 AU |
| 2.1985 AU | |
| Eccentricity | 0.1246 |
| 3.26yr (1,191 days) | |
| 93.483° | |
| 0° 18m 8.64s / day | |
| Inclination | 0.0751° |
| 333.23° | |
| 350.11° | |
| Physical characteristics | |
| Dimensions | 6.13±0.42 km[5] 6.414±0.086 km[6] 6.925±0.051 km[7] 8.18 km(calculated)[3] |
| 2.2837±0.0001h(dated)[8] 4.566±0.004 h[9] 4.566945±0.000001 h[10] 4.56695±0.00005 h[11] 4.568±0.001 h[12] | |
| 0.20(assumed)[3] 0.3118±0.0507[7] 0.391±0.041[5] | |
| S(assumed)[3] | |
| 12.70[5][7] · 12.8[1][3] · 12.93±0.25[13] | |
1486 Marilyn, provisional designation1938 QA, is a stony backgroundasteroid from the inner regions of theasteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 23 August 1938, by Belgian astronomerEugène Delporte at theRoyal Observatory of Belgium in Uccle.[14] The asteroid was named after Marilyn Herget, daughter of astronomerPaul Herget.[2]
Marilyn is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in theinner asteroid belt at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,191 days). Its orbit has aneccentricity of 0.12 and aninclination of 0° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Uccle. Noprecoveries were taken.[14]
Marilyn is an assumed stonyS-type asteroid.[3]
In August and September 2013, two rotationallightcurves ofMarilyn were obtained from photometric observations. Lightcurve analysis gave a well-definedrotation period of 4.566 and 4.568 hours with a brightness variation of 0.48 and 0.42magnitude, respectively (U=3/3).[9][12] The results supersede a period of 2.2837 hours (half the previous period solution) from a fragmentary lightcurve obtained by Maurice Audejean in March 2012 (U=1+).[8]
The studies have also modeled the asteroid's lightcurve, using photometric data from the Lowell Photometric Database (LPD) and other sources. Modelling gave a concurring period of 4.566945 and 4.56695 hours, respectively.[10][11] Each of the two studies also gave two spin axis inecliptic coordinates (λ, β): (83.0°, −57°) and (270.0°, –62.0°),[10] as well as (88.0°, −88°) and (267.0°, −66°).[11]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Marilyn measures between 6.13 and 6.925 kilometers in diameter and its surface has analbedo between 0.3118 and 0.391.[5][6][7]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.18 kilometers based on anabsolute magnitude of 12.8.[3]
Thisminor planet was named after Marilyn Herget, daughter of American astronomerPaul Herget, whocomputed the body's orbit (H 133).[2] Herget is also the author ofThe Names of the Minor Planets first released in the 1950s.[2] The asteroid1751 Herget was named after him.[2]
