911_Agamemnon

911 Agamemnon

911 Agamemnon

Jupiter trojan

911 Agamemnon, provisional designation 1919 FD, is a large Jupiter trojan and a suspected binary asteroid from the Greek camp, approximately 168 kilometers (100 miles) in diameter. It was discovered on 19 March 1919, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[1] The dark D-type asteroid is one of the largest Jupiter trojans and has a rotation period of 6.6 hours.[5] It is named after the Greek King Agamemnon, a main character of the Iliad.[3]

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Orbit and classification

Agamemnon is a dark Jovian asteroid orbiting in the Greek camp at Jupiter's leading L4 Lagrangian point, 60° ahead of its orbit in a 1:1 resonance (see Trojans in astronomy).[6] It is also a non-family asteroid in the Jovian background population.[7]

It orbits the Sun at a distance of 4.9–5.6 AU once every 12 years and 1 month (4,427 days; semi-major axis of 5.28 AU). Its orbit has an eccentricity of 0.07 and an inclination of 22° with respect to the ecliptic.[4] The body's observation arc begins at Heidelberg in October 1927, more than 8 years after its official discovery observation.[1]

Physical characteristics

In the Tholen classification, Agamemnon is a dark D-type asteroid.[19] It has also been characterized as a D-type in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2).[19][18]

Rotation period

Photometric observations of this asteroid during 1997 were used to build a lightcurve showing a rotation period of 6.5819±0.0007 hours with a brightness variation of 0.29±0.01 magnitude. A 2009 study yielded a period of 6.592±0.004 hours, in reasonable agreement with the previous result.[5][14]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Agamemnon measures between 131.04 and 185.30 kilometers in diameter, based on a common absolute magnitude of 7.89 and a surface albedo between 0.037 and 0.072.[11][12][13] A concurring diameter estimate of 169±3 kilometers from an occultation event (see below) has also been obtained.[9] The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, that is, an albedo of 0.0444 and a diameter of 166.66 kilometers based on an absolute magnitude of 7.89.[5]

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Shape and satellite

A 2012 stellar occultation produced a 2D shape model of roughly 190.6 km × 143.8 km (with an irregular, skewed outline)[10] and are suggestive of Agamemnon to have a satellite of approximately 5+5
−2 kilometers in diameter orbiting at 278±5 km from the primary's center.[9]

Naming

This minor planet named from Greek mythology after King Agamemnon, the leader of the Greeks in the Trojan War. He is a main character of Homer's Iliad. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 88).[3]

Notes

  1. Lightcurve plots of (911) Agamemnon from March 2014 by Robert Stephens at the Center for Solar System Studies (U81) with a period of 6.59±0.01 and an amplitude of 0.21 mag. Quality code is 3- (lightcurve rating at CS3). Summary figures at the LCDB and CS3.

References

  1. [1]
    "911 Agamemnon (1919 FD)". Minor Planet Center. Retrieved 14 June 2018.
  2. [2]
    Noah Webster (1884) A Practical Dictionary of the English Language
  3. [3]
    Schmadel, Lutz D. (2007). "(911) Agamemnon". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 81. doi:10.1007/978-3-540-29925-7_912. ISBN 978-3-540-00238-3.
  4. [4]
    "JPL Small-Body Database Browser: 911 Agamemnon (1919 FD)" (2018-05-25 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2018.
  5. [5]
    "LCDB Data for (911) Agamemnon". Asteroid Lightcurve Database (LCDB). Retrieved 14 June 2018.
  6. [6]
    "List of Jupiter Trojans". Minor Planet Center. 4 October 2017. Retrieved 19 October 2017.
  7. [7]
    "Asteroid (911) Agamemnon – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 6 June 2018.
  8. [8]
    Browning (1877) The Agamemnon of Aeschylus
  9. [9]
    Timerson, Bradley; Brooks, John; Conard, Steven; Dunham, David W.; Herald, David; Tolea, Alin; et al. (October 2013). "Occultation evidence for a satellite of the Trojan asteroid (911) Agamemnon". Planetary and Space Science. 87: 78–84. arXiv:1310.3220. Bibcode:2013P&SS...87...78T. doi:10.1016/j.pss.2013.08.015. S2CID 119186462.
  10. [10]
    "Agamemnon profile predicted from distributedly observed occultations of the same star". IOTA (International Occultation Timing Association). 19 January 2012. Archived from the original on 3 March 2016. Retrieved 4 March 2018.
  11. [11]
    Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
  12. [12]
    Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
  13. [13]
    Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  14. [14]
    Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
  15. [15]
    French, Linda M.; Stephens, Robert D.; Coley, Daniel R.; Megna, Ralph; Wasserman, Lawrence H. (July 2012). "Photometry of 17 Jovian Trojan Asteroids". The Minor Planet Bulletin. 39 (3): 183–187. Bibcode:2012MPBu...39..183F. ISSN 1052-8091. Retrieved 6 June 2018.
  16. [16]
    Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (October 2014). "Trojan Asteroids Observed from CS3: 2014 January-May". The Minor Planet Bulletin. 41 (4): 210–212. Bibcode:2014MPBu...41..210S. ISSN 1052-8091. Retrieved 6 June 2018.
  17. [17]
    Stephens, Robert D. (April 2009). "Asteroids Observed from GMARS and Santana Observatories". The Minor Planet Bulletin. 36 (2): 59–62. Bibcode:2009MPBu...36...59S. ISSN 1052-8091. Retrieved 6 June 2018.
  18. [18]
    Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 6 June 2018.
  19. [19]
    "Asteroid 911 Agamemnon". Small Bodies Data Ferret. Archived from the original on 6 April 2023. Retrieved 6 June 2018.
  20. [20]
    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. S2CID 53493339.
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