| 释义 |
- Orbit and classification
- Naming
- Physical characteristics Rotation period Diameter and albedo
- Notes
- References
- External links
{{Infobox planet
| minorplanet = yes
| name = 9023 Mnesthus
| background = #C2FFFF
| image =
| image_size =
| caption =
| discovery_ref = [1]
| discoverer = C. Shoemaker
E. Shoemaker
| discovery_site = Palomar Obs.
| discovered = 10 September 1988
| mpc_name = (9023) Mnesthus
| alt_names = {{mp|1988 RG|1}}
| pronounced = {{IPAc-en|ˈ|n|ɛ|s|θ|ə|s}}{{·}}{{Respell|NES|thəs}}
| named_after = Mnestheus [1]
{{small|(Greco-Roman mythology)}}
| mp_category = Jupiter trojan [1]
{{nowrap|Trojan [5]{{·}}background [6]}}
| orbit_ref =
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 67.76 yr (24,750 d)
| aphelion = 5.5611 AU
| perihelion = 4.8924 AU
| semimajor = 5.2268 AU
| eccentricity = 0.0640
| period = 11.95 yr (4,365 d)
| mean_anomaly = 192.08°
| mean_motion = {{Deg2DMS|0.0825|sup=ms}} / day
| inclination = 23.917°
| asc_node = 159.89°
| arg_peri = 158.39°
| jupiter_moid = 0.0701 AU
| tisserand = 2.8240
| mean_diameter = {{val|49.15|0.59|ul=km}}[8]
{{val|60.80|4.15|u=km}}[9]
| rotation = {{val|30.66|0.01|ul=h}}[10]{{efn|name=lightcurve-plots-CS3}}
| albedo = {{val|0.033|0.005}}[9]
{{val|0.073|0.014}}[8]
| spectral_type = C {{small|(assumed)}}[13]
| abs_magnitude = 10.0[8]
10.1[1]
10.2[13]
10.40[9]
}}9023 Mnesthus ({{IPAc-en|ˈ|n|ɛ|s|θ|ə|s}} {{Respell|NES|thəs}}), provisional designation {{mp|1988 RG|1}}, is a large Jupiter trojan from the Trojan camp, approximately {{convert|50|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 10 September 1988, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California.[1] The dark Jovian asteroid belongs to the 100 largest Jupiter trojans and has a longer-than-average rotation period of 30.7 hours.[13] It was named after the Trojan Mnestheus, a companion of Aeneas in Classical mythology.[1] Orbit and classification Mnesthus is a dark Jovian asteroid 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 {{cross reference|(see Trojans in astronomy)}}.[5] It is also a non-family asteroid of the Jovian background population.[6]It orbits the Sun at a distance of 4.9–5.6 AU once every 11 years and 11 months (4,365 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.06 and an inclination of 24° with respect to the ecliptic. Naming This minor planet was named from Greco-Roman mythology after the Trojan Mnestheus, a companion and officer of Aeneas in Classical mythology. He is one of the wandering Aeneads who traveled to Italy after the downfall of Troy. At the funeral games for Aeneas' father, Anchises, he competes in both the sailing and the archery contests, winning second place in sailing.[1] The official naming citation was published by the Minor Planet Center on 13 October 2000 ({{small|M.P.C. 41384}}).[27] Physical characteristics Mnesthus is an assumed C-type asteroid.[13] Jovian asteroids are typically D-types, with the remainder being mostly carbonaceous C- and primitive P-type asteroids. Rotation period In August 2011, a rotational lightcurve of Mnesthus was obtained from photometric observations by Daniel Coley and Robert Stephens at the Center for Solar System Studies and GMARS {{Obscode|G79}}, respectively. Lightcurve analysis gave a longer-than average rotation period of {{val|30.66|0.01}} hours with a brightness amplitude of 0.23 magnitude ({{small|U=2+}}).[10][13]{{efn|name=lightcurve-plots-CS3}} Diameter and albedo According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and the Japanese Akari satellite, Mnesthus measures 49.15 and 60.80 kilometers in diameter and its surface has an albedo of 0.073 and 0.033, respectively.[8][9] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 50.77 kilometers based on an absolute magnitude of 10.2.[13] {{Largest Jupiter trojans}} Notes {{notelist|refs={{efn|name=lightcurve-plots-CS3|1=Lightcurve plots of (9023) Mnesthus from Aug 2011 by Daniel Coley at the Center for Solar System Studies {{Obscode|U80}}. Quality code is 2- (lightcurve rating at CS3). Summary figures at the LCDB and CS3.}}}} References 1. ^1 2 3 4 5 6 7 8 {{cite web |title = 9023 Mnesthus (1988 RG1) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=9023 |accessdate = 22 June 2018}}
2. ^1 2 {{cite web |title = List of Jupiter Trojans |work = Minor Planet Center |first3 = V. |last3 = Carruba |date = 1 June 2018 |url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html |accessdate = 22 June 2018}}
3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 22 June 2018}}
4. ^1 2 3 4 {{cite journal |first1 = T. |last1 = Grav |first2 = A. K. |last2 = Mainzer |first3 = J. M. |last3 = Bauer |first4 = J. R. |last4 = Masiero |first5 = C. R. |last5 = Nugent |date = November 2012 |title = WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759...49G |journal = The Astrophysical Journal |volume = 759 |issue = 1 |page = 10 |bibcode = 2012ApJ...759...49G |doi = 10.1088/0004-637X/759/1/49 |arxiv = 1209.1549 |access-date= 22 June 2018}} (online catalog)
5. ^1 2 {{cite web |title = Asteroid (9023) Mnesthus – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=9023&pc=1.1.6 |access-date= 22 June 2018}}
6. ^1 2 3 4 5 6 {{cite web |title = LCDB Data for (9023) Mnesthus |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=9023%7CMnesthus |accessdate = 22 June 2018}}
7. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |url = http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |access-date= 22 June 2018}} (online, [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
8. ^1 2 {{Cite journal |first1 = Linda M. |last1 = French |first2 = Robert D. |last2 = Stephens |first3 = Daniel R. |last3 = Coley |first4 = Ralph |last4 = Megna |first5 = Lawrence H. |last5 = Wasserman |date = July 2012 |title = Photometry of 17 Jovian Trojan Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39..183F |journal = The Minor Planet Bulletin |volume = 39 |issue = 3 |pages = 183–187 |issn = 1052-8091 |bibcode = 2012MPBu...39..183F |access-date= 22 June 2018}}
[1][2][3][4][5][6][7][8]}} External links - Asteroid Lightcurve Database (LCDB), query form (info)
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=9023+Mnesthus Asteroid 9023 Mnesthus] at the Small Bodies Data Ferret
- {{AstDys|9023}}
- {{JPL small body}}
{{Use dmy dates|date=June 2018}}{{Minor planets navigator |9022 Drake |number=9023 |9024 Gunnargraps }}{{Small Solar System bodies}}{{DEFAULTSORT:Mnesthus}} 6 : Jupiter trojans (Trojan camp)|Discoveries by Carolyn S. Shoemaker|Discoveries by Eugene Merle Shoemaker|Minor planets named from Greek mythology|Named minor planets|Astronomical objects discovered in 1988 |