1486 Marilyn,provisional designation1938 QA,is a stony backgroundasteroidfrom the inner regions of theasteroid belt,approximately 6.5 kilometers in diameter. It was discovered on 23 August 1938, by Belgian astronomerEugène Delporteat theRoyal Observatory of Belgiumin Uccle.[14]The asteroid was named after Marilyn Herget, daughter of astronomerPaul Herget.[2]
 Shape ofMarilynmodelled 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] | |
| Epoch4 September 2017 (JD2458000.5) | |
| Uncertainty parameter0 | |
| 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° 18m8.64s/ day | |
| Inclination | 0.0751° |
| 333.23° | |
| 350.11° | |
| Physical characteristics | |
| Dimensions | 6.13±0.42km[5] 6.414±0.086km[6] 6.925±0.051km[7] 8.18 km(calculated)[3] |
| 2.2837±0.0001h(dated)[8] 4.566±0.004h[9] 4.566945±0.000001h[10] 4.56695±0.00005h[11] 4.568±0.001h[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] | |
Orbit and classification
editMarilynis a non-familyasteroid from the main belt'sbackground population.[4]It orbits the Sun in theinnerasteroid belt at a distance of 1.9–2.5AUonce every 3 years and 3 months (1,191 days). Its orbit has aneccentricityof 0.12 and aninclinationof 0°with respect to theecliptic.[1]The body'sobservation arcbegins with its official discovery observation at Uccle. Noprecoverieswere taken.[14]
Physical characteristics
editMarilynis an assumed stonyS-type asteroid.[3]
Rotation period
editIn August and September 2013, two rotationallightcurvesofMarilynwere obtained from photometric observations. Lightcurve analysis gave a well-definedrotation periodof 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]
Spin axis
editThe 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]
Diameter and albedo
editAccording to the survey carried out by theNEOWISEmission of NASA'sWide-field Infrared Survey Explorer,Marilynmeasures between 6.13 and 6.925 kilometers in diameter and its surface has analbedobetween 0.3118 and 0.391.[5][6][7]
TheCollaborative Asteroid Lightcurve Linkassumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.18 kilometers based on anabsolute magnitudeof 12.8.[3]
Naming
editThisminor planetwas named after Marilyn Herget, daughter of American astronomerPaul Herget,whocomputedthe body's orbit (H 133).[2]Herget is also the author ofThe Names of the Minor Planetsfirst released in the 1950s.[2]The asteroid1751 Hergetwas named after him.[2]
References
edit- ^abcd"JPL Small-Body Database Browser: 1486 Marilyn (1938 QA)"(2017-10-01 last obs.).Jet Propulsion Laboratory.Archived fromthe originalon 20 August 2020.Retrieved19 October2017.
- ^abcdeSchmadel, Lutz D. (2007). "(1486) Marilyn".Dictionary of Minor Planet Names – (1486) Marilyn.Springer Berlin Heidelberg.pp. 118–119.doi:10.1007/978-3-540-29925-7_1487.ISBN978-3-540-00238-3.
- ^abcdefg"LCDB Data for (1486) Marilyn".Asteroid Lightcurve Database (LCDB).Retrieved19 October2017.
- ^ab"Asteroid 1486 Marilyn – Proper Elements".AstDyS-2, Asteroids – Dynamic Site.Retrieved29 October2019.
- ^abcdMasiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012)."Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids".The Astrophysical Journal Letters.759(1): 5.arXiv:1209.5794.Bibcode:2012ApJ...759L...8M.doi:10.1088/2041-8205/759/1/L8.Retrieved19 October2017.
- ^abMasiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014)."Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos".The Astrophysical Journal.791(2): 11.arXiv:1406.6645.Bibcode:2014ApJ...791..121M.doi:10.1088/0004-637X/791/2/121.Retrieved19 October2017.
- ^abcdMainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results".The Astrophysical Journal.741(2): 25.arXiv:1109.6407.Bibcode:2011ApJ...741...90M.doi:10.1088/0004-637X/741/2/90.
- ^abBehrend, Raoul."Asteroids and comets rotation curves – (1486) Marilyn".Geneva Observatory.Retrieved19 October2017.
- ^abBenishek, Vladimir (April 2014)."Rotation Period Determination for 1425 Tuorla, 1468 Zomba, 1486 Marilyn, 2112 Ulyanov, and (101158) 2000 OL".The Minor Planet Bulletin.41(2): 126–127.Bibcode:2014MPBu...41..126B.ISSN1052-8091.Retrieved19 October2017.
- ^abcDurech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016)."Asteroid models from the Lowell photometric database".Astronomy and Astrophysics.587:6.arXiv:1601.02909.Bibcode:2016A&A...587A..48D.doi:10.1051/0004-6361/201527573.Retrieved19 October2017.
- ^abcHanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network".Astronomy and Astrophysics.586:24.arXiv:1510.07422.Bibcode:2016A&A...586A.108H.doi:10.1051/0004-6361/201527441.
- ^abFerrero, Andrea (January 2014)."Period Determination of Four Main-belt Asteroids in Mid-2013".The Minor Planet Bulletin.41(1): 24–25.Bibcode:2014MPBu...41...24F.ISSN1052-8091.Retrieved19 October2017.
- ^Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015)."Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results".Icarus.261:34–47.arXiv:1506.00762.Bibcode:2015Icar..261...34V.doi:10.1016/j.icarus.2015.08.007.Retrieved19 October2017.
- ^ab"1486 Marilyn (1938 QA)".Minor Planet Center.Retrieved19 October2017.
External links
edit- Asteroid Lightcurve Database (LCDB),query form (infoArchived16 December 2017 at theWayback Machine)
- Dictionary of Minor Planet Names,Google books
- Asteroids and comets rotation curves, CdR– Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000)– Minor Planet Center
- 1486 MarilynatAstDyS-2, Asteroids—Dynamic Site
- 1486 Marilynat theJPL Small-Body Database
