Astronomy:4791 Iphidamas

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4791 Iphidamas
Discovery [1]
Discovered byC. Shoemaker
Discovery sitePalomar Obs.
Discovery date14 August 1988
Designations
(4791) Iphidamas
Pronunciation/ɪˈfɪdəməs/[5]
Named afterIphidamas [1]
(Greek mythology)
1988 PB1
Minor planet categoryJupiter trojan [1][2]
Trojan [3] · background [4]
AdjectivesIphidamantian
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc29.77 yr (10,874 d)
|{{{apsis}}}|helion}}5.3969 AU
|{{{apsis}}}|helion}}4.9230 AU
5.1600 AU
Eccentricity0.0459
Orbital period11.72 yr (4,281 d)
Mean anomaly91.938°
Mean motion0° 5m 2.76s / day
Inclination25.970°
Longitude of ascending node261.46°
165.77°
Jupiter MOID0.1002 AU
TJupiter2.7970
Physical characteristics
Mean diameter49.53±0.66 km[6]
57.85±4.0 km[7]
59.96±1.79 km[8]
Rotation period9.696±0.006 h[9][lower-alpha 1]
Geometric albedo0.055±0.004[8]
0.0579±0.009[7]
0.079±0.005[6]
C (assumed)[10]
B–V = 0.670±0.060[11]
V–R = 0.610±0.040[11]
V–I = 1.030±0.049[10]
Absolute magnitude (H)9.90[6][7][8]
10.1[1][2][10]


4791 Iphidamas /ɪˈfɪdəməs/ is a Jupiter trojan from the Trojan camp, approximately 58 kilometers (36 miles) in diameter. It was discovered on 14 August 1988, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The dark Jovian asteroid belongs the 100 largest Jupiter trojans and has a rotation period of 9.7 hours.[10] It was named after the Trojan warrior Iphidamas, from Greek mythology.[1]

Orbit and classification

Iphidamas is a dark Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's L5 Lagrangian point, 60° behind its orbit (see Trojans in astronomy).[3] It is also a non-family asteroid of the Jovian background population.[4]

It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 9 months (4,281 days; semi-major axis of 5.16 AU). Its orbit has an eccentricity of 0.05 and an inclination of 26° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation at Palomar in August 1988.[1]

Physical characteristics

Iphidamas is an assumed, carbonaceous C-type asteroid. It has a high V–I color index of 1.03 (see table below).[10]

Rotation period

In 2014 and 2015, two rotational lightcurves of Iphidamas were obtained from photometric observations by Robert Stephens at the Center for Solar System Studies in Landers, California. Analysis of the best-rated lightcurve from December 2015 showed a rotation period of 9.696±0.006 hours with a brightness amplitude of 0.31 magnitude ({{{1}}}),[9][12][lower-alpha 1] superseding a previous period determination by Stefano Mottola at the La Silla Observatory from February 1992, which gave a similar period of 9.57 hours ({{{1}}}).[10][13]

Diameter and albedo

According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Iphidamas measures between 49.528 and 59.96 kilometers in diameter and its surface has an albedo between 0.055 and 0.079.[6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0483 and a diameter of 57.74 kilometers based on an absolute magnitude of 10.1.[10]

100+ largest Jupiter trojans

Naming

This minor planet was named from Greek mythology after the Trojan warrior Iphidamas, son of Theano and Antenor, who was the counselor of King Priam. During the Trojan War, he confronted Agamemnon in battle, but his spear bent against Agamemnon's war belt, who then killed Iphidamas with his sword.[1] The official naming citation was published by the Minor Planet Center on 27 June 1991 (M.P.C. 18465).[14]

Notes

  1. ↑ Jump up to: 1.0 1.1 Lightcurve plot of (4791) Iphidamas from Nov 2014 and Dec 2015 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is 3-/3 (lightcurve rating at CS3). Summary figures at the LCDB and CS3.

References

  1. ↑ Jump up to: 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "4791 Iphidamas (1988 PB1)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=4791. 
  2. ↑ Jump up to: 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 4791 Iphidamas (1988 PB1)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004791. 
  3. ↑ Jump up to: 3.0 3.1 "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html. 
  4. ↑ Jump up to: 4.0 4.1 "Asteroid (4791) Iphidamas – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?n=4791&pc=1.1.6. 
  5. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
  6. ↑ Jump up to: 6.0 6.1 6.2 6.3 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. doi:10.1088/0004-637X/759/1/49. Bibcode: 2012ApJ...759...49G.  (online catalog)
  7. ↑ Jump up to: 7.0 7.1 7.2 7.3 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. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 20 June 2018. 
  8. ↑ Jump up to: 8.0 8.1 8.2 8.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  9. ↑ Jump up to: 9.0 9.1 Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2016). "A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies". The Minor Planet Bulletin 43 (3): 265–270. ISSN 1052-8091. Bibcode: 2016MPBu...43..265S. 
  10. ↑ Jump up to: 10.0 10.1 10.2 10.3 10.4 10.5 10.6 "LCDB Data for (4791) Iphidamas". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4791%7CIphidamas. 
  11. ↑ Jump up to: 11.0 11.1 Chatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016). "Photometric colors of the brightest members of the Jupiter L5 Trojan cloud". Icarus 271: 158–169. doi:10.1016/j.icarus.2016.01.026. Bibcode: 2016Icar..271..158C. 
  12. ↑ Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2015). "Dispatches from the Trojan Camp - Jovian Trojan L5 Asteroids Observed from CS3: 2014 October - 2015 January". The Minor Planet Bulletin 42 (3): 216–224. ISSN 1052-8091. Bibcode: 2015MPBu...42R.216S. 
  13. ↑ 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. doi:10.1088/0004-6256/141/5/170. Bibcode: 2011AJ....141..170M. 
  14. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 

External links



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