5126 Achaemenides
Discovery [1] | |
---|---|
Discovered by | C. Shoemaker |
Discovery site | Palomar Obs. |
Discovery date | 1 February 1989 |
Designations | |
MPC designation | (5126) Achaemenides |
Pronunciation |
/ˌækɪˈmɛnɪdiːz/ AK-ə-MEN-ə-deez |
Named after |
Achaemenides [1] (Greek mythology) |
1989 CH2 | |
Jupiter trojan [1][2] Greek [3] · background [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 65.36 yr (23,871 d) |
Aphelion | 5.3722 AU |
Perihelion | 5.1131 AU |
5.2427 AU | |
Eccentricity | 0.0247 |
12.00 yr (4,385 d) | |
180.28° | |
0° 4m 55.56s / day | |
Inclination | 29.863° |
116.50° | |
353.06° | |
Jupiter MOID | 0.1391 AU |
TJupiter | 2.7330 |
Physical characteristics | |
Mean diameter |
±4.08 km 48.57[5] ±3.36 km 51.92[6] |
±0.05 h 53.02[7][lower-alpha 1] | |
±0.010 0.050[6] ±0.012 0.068[5] | |
C (assumed)[8] | |
10.10[5] 10.3[6] 10.5[1][2][8] | |
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5126 Achaemenides (/ˌækɪˈmɛnɪdiːz/ AK-ə-MEN-ə-deez), provisional designation 1989 CH2, is a Jupiter trojan from the Greek camp, approximately 50 kilometers (31 miles) in diameter. It was discovered on 1 February 1989, 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 long rotation period of 32.4 hours.[8] It was named after one of Odysseus's crew members, Achaemenides, from Greek mythology.[1]
Orbit and classification
Achaemenides is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance .[3] It is also a non-family asteroid in the Jovian background population.[4] It orbits the Sun at a distance of 5.1–5.4 AU once every 12 years (4,385 days; semi-major axis of 5.24 AU). Its orbit has an eccentricity of 0.02 and an inclination of 30° with respect to the ecliptic.[2] The body's observation arc begins with a precovery at Palomar in January 1953, more than 36 years prior to its official discovery observation.[1]
Physical characteristics
Achaemenides is an assumed C-type asteroid.[8]
Rotation period
In April 22015, a rotational lightcurve of Achaemenides was obtained from photometric observations by Daniel Coley at the Center for Solar System Studies, in collaboration with Robert Stephens and Linda French. Lightcurve analysis gave a rotation period of ±0.05 hours with a brightness amplitude of 0.36 53.02magnitude (U=3-).[7][8][lower-alpha 1] While not being a slow rotator, Achaemenides has one of the longest periods of all larger Jupiter trojans (see table below).
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Achaemenides measures 48.57 and 51.92 kilometers in diameter and its surface has an albedo of 0.068 and 0.050, respectively.[5][6]
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 44.22 kilometers based on an absolute magnitude of 10.5.[8]
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Naming
This minor planet was named from Greek mythology after the Greek warrior Achaemenides, one of few surviving members of Odysseus's crew. Left behind when Odysseus fled the blinded Cyclops, he was later rescued by the Trojan Aeneas.[1] The official naming citation was published by the Minor Planet Center on 4 June 1993 (M.P.C. 22249).[9]
Notes
References
- 1 2 3 4 5 6 7 8 "5126 Achaemenides (1989 CH2)". Minor Planet Center. Retrieved 20 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 5126 Achaemenides (1989 CH2)" (2018-05-19 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2018.
- 1 2 "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 20 June 2018.
- 1 2 "Asteroid (5126) Achaemenides – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 20 June 2018.
- 1 2 3 4 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. Retrieved 20 June 2018. (online, AcuA catalog p. 153)
- 1 2 3 4 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. Retrieved 20 June 2018. (online catalog)
- 1 2 Stephens, Robert D.; Coley, Daniel, R.; French, Linda M. (January 2016). "Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (1): 15–22. Bibcode:2016MPBu...43...15S. ISSN 1052-8091. Retrieved 20 June 2018.
- 1 2 3 4 5 6 "LCDB Data for (5126) Achaemenides". Asteroid Lightcurve Database (LCDB). Retrieved 20 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- Asteroid 5126 Achaemenides at the Small Bodies Data Ferret
- 5126 Achaemenides at AstDyS-2, Asteroids—Dynamic Site
- 5126 Achaemenides at the JPL Small-Body Database