4707 Khryses


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4707 Khryses is a larger Jupiter trojan from the Trojan camp, approximately 40 kilometers (25 miles) in diameter. It was discovered on 13 August 1988, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The assumed C-type asteroid has a rotation period 6.9 hours and likely an elongated shape.[6] It was named after the Trojan priest Chryses (Khryseis) from Greek mythology.[1]

4707 Khryses
Discovery [1]
Discovered byC. Shoemaker
Discovery sitePalomar Obs.
Discovery date13 August 1988
Designations
(4707) Khryses
Pronunciation

Named after

Chryses (Greek mythology)[1]
1988 PY
Jupiter trojan [1][2]
Trojan [3] · background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc64.76 yr (23,655 d)
Aphelion5.8233 AU
Perihelion4.5622 AU
5.1927 AU
Eccentricity0.1214
11.83 yr (4,322 d)
156.38°
0° 4m 59.88s / day
Inclination7.0941°
310.18°
66.984°
Jupiter MOID0.0273 AU
TJupiter2.9700
Physical characteristics
37.77±0.47 km[5]
42.23 km(calculated)[6]
6.862±0.002 h[7]
0.057 (assumed)[6]
0.086±0.021[5]
C (assumed)[6]
10.40[5]
10.6[1][2][6]

Orbit and classification

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Khryses is a 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 orbits the Sun at a distance of 4.6–5.8 AU once every 11 years and 10 months (4,322 days; semi-major axis of 5.19 AU). Its orbit has an eccentricity of 0.12 and an inclination of 7° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar in August 1953, or 35 years prior to its official discovery observation.[1]

This minor planet was named after Trojan Chryses (Khryseis), a priest of Apollo. His daughter Chryseis (Khryseis) was abducted by Agamemnon during the Trojan War. Apollo then sent a plague sweeping through the Greek camp, forcing Agamemnon to give back the priest's daughter.[1] The official naming citation was published by the Minor Planet Center on 28 April 1991 (M.P.C. 18144).[8]

Physical characteristics

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Khryses is an assumed, carbonaceous C-type asteroid.[6] Most Jupiter trojans are D-types, with the remainder being mostly C- and P-type asteroids.[6]

Since 2013, several rotational lightcurves of Khryses have been obtained from photometric observations by Daniel Coley and Robert Stephens at the Center for Solar System Studies in Landers, California.[9][10][11] Best-rated lightcurve by Daniel Coley from four nights of observations in 2017 gave a well-defined rotation period of 6.862±0.002 hours with a brightness amplitude of 0.41 magnitude, which indicates that the body has a non-spherical shape (U=3).[6][7][a]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Khryses measures 37.77 kilometers in diameter and its surface has an albedo of 0.086,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 42.23 kilometers based on an absolute magnitude of 10.6.[6]

  1. ^ Lightcurve plots of (4707) Khryses from Sep 2013, Oct 2014, Feb 2016 and Jan 2017 by Daniel Coley and Robert Stephens at the Center for Solar System Studies (U80) and (U81). Quality code is 3-/n.a./3/3 (lightcurve rating at CS3). Summary figures at the LCDB and CS3.
  1. ^ a b c d e f g h "4707 Khryses (1988 PY)". Minor Planet Center. Retrieved 27 June 2018.
  2. ^ a b c d "JPL Small-Body Database Browser: 4707 Khryses (1988 PY)" (2018-05-22 last obs.). Jet Propulsion Laboratory. Retrieved 27 June 2018.
  3. ^ a b "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 27 June 2018.
  4. ^ "Asteroid (4707) Khryses – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 27 June 2018.
  5. ^ a b c d 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. Retrieved 27 June 2018. (online catalog)
  6. ^ a b c d e f g h i "LCDB Data for (4707) Khryses". Asteroid Lightcurve Database (LCDB). Retrieved 27 June 2018.
  7. ^ a b Stephens, Robert D.; Coley, Daniel R. (July 2017). "Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March". The Minor Planet Bulletin. 44 (3): 252–257. Bibcode:2017MPBu...44..252S. ISSN 1052-8091. PMC 7243922. PMID 32455404.
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 June 2018.
  9. ^ 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. Bibcode:2016MPBu...43..265S. ISSN 1052-8091. Retrieved 27 June 2018.
  10. ^ 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. Bibcode:2015MPBu...42R.216S. ISSN 1052-8091. Retrieved 27 June 2018.
  11. ^ Stephens, Robert D.; French, Linda M.; Davitt, Chelsea; Coley, Daniel R. (April 2014). "At the Scaean Gates: Observations Jovian Trojan Asteroids, July- December 2013". The Minor Planet Bulletin. 41 (2): 95–100. Bibcode:2014MPBu...41...95S. ISSN 1052-8091. Retrieved 27 June 2018.