1486 Marilyn

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1486 Marilyn
Discovery [1]
Discovered byE. Delporte
Discovery siteUccle Obs.
Discovery date23 August 1938
MPC designation(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 arc79.11 yr (28,894 days)
Aphelion2.4725 AU
Perihelion1.9245 AU
2.1985 AU
3.26 yr (1,191 days)
0° 18m 8.64s / day
Physical characteristics
Dimensions6.13±0.42 km[5]
6.414±0.086 km[6]
6.925±0.051 km[7]
8.18 km (calculated)[3]
2.2837±0.0001 h (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]
S (assumed)[3]
12.70[5][7] · 12.8[1][3] · 12.93±0.25[13]

1486 Marilyn, provisional designation 1938 QA, is a stony background asteroid from the inner regions of the asteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 23 August 1938, by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle.[14] The asteroid was named after Marilyn Herget, daughter of astronomer Paul Herget.[2]

Orbit and classification[edit]

Marilyn is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,191 days). Its orbit has an eccentricity of 0.12 and an inclination of 0° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Uccle. No precoveries were taken.[14]

Physical characteristics[edit]

Marilyn is an assumed stony S-type asteroid.[3]

Rotation period[edit]

In August and September 2013, two rotational lightcurves of Marilyn were obtained from photometric observations. Lightcurve analysis gave a well-defined rotation period of 4.566 and 4.568 hours with a brightness variation of 0.48 and 0.42 magnitude, 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[edit]

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 in ecliptic 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[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Marilyn measures between 6.13 and 6.925 kilometers in diameter and its surface has an albedo between 0.3118 and 0.391.[5][6][7]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.18 kilometers based on an absolute magnitude of 12.8.[3]


This minor planet was named after Marilyn Herget, daughter of American astronomer Paul Herget, who computed the body's orbit (H 133).[2] Herget is also the author of The Names of the Minor Planets first released in the 1950s.[2] The asteroid 1751 Herget was named after him.[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1486 Marilyn (1938 QA)" (2017-10-01 last obs.). Jet Propulsion Laboratory. Retrieved 19 October 2017.
  2. ^ a b c d e Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1486) Marilyn. Springer Berlin Heidelberg. pp. 118–119. ISBN 978-3-540-00238-3. Retrieved 19 October 2017.
  3. ^ a b c d e f g "LCDB Data for (1486) Marilyn". Asteroid Lightcurve Database (LCDB). Retrieved 19 October 2017.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 19 October 2017.
  5. ^ a b c d e Masiero, 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. Retrieved 19 October 2017.
  6. ^ a b Masiero, 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. Retrieved 19 October 2017.
  7. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 19 October 2017.
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1486) Marilyn". Geneva Observatory. Retrieved 19 October 2017.
  9. ^ a b Benishek, 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. ISSN 1052-8091. Retrieved 19 October 2017.
  10. ^ a b c Durech, 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. Retrieved 19 October 2017.
  11. ^ a b c Hanus, 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" (PDF). Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. Retrieved 19 October 2017.
  12. ^ a b Ferrero, 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. ISSN 1052-8091. Retrieved 19 October 2017.
  13. ^ 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. Retrieved 19 October 2017.
  14. ^ a b "1486 Marilyn (1938 QA)". Minor Planet Center. Retrieved 19 October 2017.

External links[edit]