9712 Nauplius
Discovery [1] | |
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Discovered by |
C. J. van Houten I. van Houten-G. T. Gehrels |
Discovery site | Palomar Obs. |
Discovery date | 19 September 1973 |
Designations | |
MPC designation | (9712) Nauplius |
Pronunciation | /ˈnɔːpliəs/ · NAW-plee-əs |
Named after |
Nauplius [1] (Greek mythology) |
1973 SO1 · 1978 EO9 1989 EB8 | |
Jupiter trojan [1][2] Greek [3] · background [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 43.70 yr (15,963 d) |
Aphelion | 5.8944 AU |
Perihelion | 4.5736 AU |
5.2340 AU | |
Eccentricity | 0.1262 |
11.97 yr (4,374 d) | |
195.94° | |
0° 4m 56.28s / day | |
Inclination | 8.4625° |
176.61° | |
274.09° | |
Jupiter MOID | 0.1058 AU |
TJupiter | 2.9620 |
Physical characteristics | |
Mean diameter | ±4.32 km 33.42[5] |
±0.02 h 19.41[6][lower-alpha 1] | |
±0.026 0.083[5] | |
C (assumed)[7] | |
10.70[5] 10.8[1][2][7] | |
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9712 Nauplius (/ˈnɔːpliəs/ NAW-plee-əs), provisional designation 1973 SO1, is a mid-sized Jupiter trojan from the Greek camp, approximately 33 kilometers (21 miles) in diameter. It was discovered during the second Palomar–Leiden Trojan survey at the Palomar Observatory in 1973 and later named after Nauplius the Wrecker, from Greek mythology.[1] The dark Jovian asteroid has a rotation period of 19.4 hours.[7]
Discovery
Nauplius was discovered on 19 September 1973, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by astronomer Tom Gehrels at the Palomar Observatory in California.[1] The body's observation arc begins with its official discovery observation at Palomar.[1]
Palomar–Leiden Trojan survey
Despite being discovered during the second Palomar–Leiden Trojan survey in 1973, Nauplius has not received a provisional survey designation prefixed with "T-2". The survey was a fruitful collaboration between the Palomar and Leiden observatories during the 1960s and 1970s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroids.[8]
Orbit and classification
Nauplius is a dark Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the leading Greek camp at the Gas Giant's L4 Lagrangian point, 60° ahead on its orbit .[3] It is also a non-family asteroid of the Jovian background population.[4] It orbits the Sun at a distance of 4.6–5.9 AU once every 12 years (4,374 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.13 and an inclination of 8° with respect to the ecliptic.[2]
Naming
This minor planet was named after Nauplius, a son of Poseidon and Amymone. He was a king of Euboea and the father of Palamedes, who was killed after a false accusation by Odysseus during the Trojan War. Nauplius revenged the death of his son by placing lights on the cliffs of his kingdom, causing the Greek fleet to shipwreck on its return from Troy.[1] The official naming citation was published by the Minor Planet Center on 2 April 1999 (M.P.C. 34355).[9]
Physical characteristics
Nauplius is an assumed C-type asteroid, while the majority of larger Jupiter trojans are D-types.[7]
Rotation period
In March 2014, a first rotational lightcurve of Nauplius was obtained from photometric observations over a total of eight nights by Robert Stephens at the Center for Solar System Studies in Landers, California. Lightcurve analysis gave a rotation period of ±0.02 hours with a relatively high brightness amplitude of 0.48 19.41magnitude (U=2).[6][lower-alpha 1]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Nauplius measures 33.42 kilometers in diameter and its surface has an albedo of 0.083,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 38.51 kilometers based on an absolute magnitude of 10.8.[7]
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Notes
References
- 1 2 3 4 5 6 7 8 "9712 Nauplius (1973 SO1)". Minor Planet Center. Retrieved 3 July 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 9712 Nauplius (1973 SO1)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 3 July 2018.
- 1 2 "List of Jupiter Trojans". Minor Planet Center. 1 July 2018. Retrieved 3 July 2018.
- 1 2 "Asteroid (9712) Nauplius – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 3 July 2018.
- 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 3 July 2018. (online catalog)
- 1 2 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 3 July 2018.
- 1 2 3 4 5 "LCDB Data for (9712) Nauplius". Asteroid Lightcurve Database (LCDB). Retrieved 3 July 2018.
- ↑ "Minor Planet Discoverers". Minor Planet Center. 31 May 2018. Retrieved 3 July 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 July 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 9712 Nauplius at the Small Bodies Data Ferret
- 9712 Nauplius at AstDyS-2, Asteroids—Dynamic Site
- 9712 Nauplius at the JPL Small-Body Database