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911 Agamemnon

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Jupiter trojan

911 Agamemnon
Discovery^[1]
Shape model ofAgamemnon from itslightcurve
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	19 March 1919
Designations
MPC designation	(911) Agamemnon
Pronunciation	/æɡəˈmɛmnɒn/^[2]
Named after	Agamemnon^[3] (Greek mythology)
Alternative designations	1919 FD · 1937 QD
Minor planet category	Jupiter trojan^[1]^[4]^[5] Greek^[6]^[7] · background^[7]
Adjectives	Agamemnonian/ˌæɡəmɛmˈnoʊniən/^[8]
Orbital characteristics^[4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	97.93yr (35,770 d)
Aphelion	5.6232AU
Perihelion	4.9300 AU
Semi-major axis	5.2766 AU
Eccentricity	0.0657
Orbital period (sidereal)	12.12 yr (4,427 d)
Mean anomaly	236.05°
Mean motion	0° 4^m 52.68^s / day
Inclination	21.763°
Longitude of ascending node	338.01°
Argument of perihelion	80.874°
Knownsatellites	1(suspected)^[9]
Jupiter MOID	0.1064 AU
T_Jupiter	2.8530
Physical characteristics
Dimensions	190.6 km × 143.8 km^[10]
Mean diameter	131.04±1.19 km^[11] 166.66±3.9 km^[12] 169±3 km^[9] 185.30±3.37 km^[13]
Synodic rotation period	6.5819±0.0007 h^[14] 6.59±0.01 h^[15]^[16]^[a] 6.592±0.004 h^[17]
Geometric albedo	0.037±0.001^[13] 0.0444±0.002^[12] 0.072±0.010^[11]
Spectral type	D(Tholen)^[4]^[5] D(S3OS2)^[18] U–B =0.215±0.021^[19] B–V =0.760±0.014^[19] V–I =0.980±0.038^[5]
Absolute magnitude (H)	7.89^[1]^[4]^[11]^[12]^[13] 8.27^[20]

911 Agamemnon, provisional designation1919 FD, is aJupiter trojan and a suspectedbinary asteroid from theGreek camp, approximately 168 kilometers (100 miles) in diameter. It was discovered on 19 March 1919, by German astronomerKarl Reinmuth at theHeidelberg Observatory in southwest Germany.^[1] The darkD-type asteroid is likely thesecond-largest Jupiter trojans and has arotation period of 6.6 hours.^[5] It is named after the Greek KingAgamemnon, a main character of theIliad.^[3]

Orbit and classification

[edit]

Agamemnon is a dark Jovianasteroid orbiting in theGreek camp at Jupiter's leadingL₄ Lagrangian point, 60° ahead of its orbit in a1:1 resonance(seeTrojans in astronomy).^[6] It is also a non-family asteroid in theJovian background population.^[7]

It orbits the Sun at a distance of 4.9–5.6 AU once every 12 years and 1 month (4,427 days;semi-major axis of 5.28 AU). Its orbit has aneccentricity of 0.07 and aninclination of 22° with respect to theecliptic.^[4] The body'sobservation arc begins at Heidelberg in October 1927, more than 8 years after its official discovery observation.^[1]

Physical characteristics

[edit]

In theTholen classification,Agamemnon is a darkD-type asteroid.^[19] It has also been characterized as a D-type in both the Tholen- and SMASS-like taxonomy of theSmall Solar System Objects Spectroscopic Survey (S3OS2).^[19]^[18]

Rotation period

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Photometric observations of this asteroid during 1997 were used to build alightcurve showing arotation period of6.5819±0.0007 hours with a brightness variation of0.29±0.01magnitude. A 2009 study yielded a period of6.592±0.004 hours, in reasonable agreement with the previous result.^[5]^[14]

Diameter and albedo

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According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Agamemnon measures between 131.04 and 185.30 kilometers in diameter, based on a commonabsolute magnitude of 7.89 and a surfacealbedo between 0.037 and 0.072.^[11]^[12]^[13] A concurring diameter estimate of169±3 kilometers from an occultation event(see below) has also been obtained.^[9] TheCollaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, that is, an albedo of 0.0444 and a diameter of 166.66 kilometers based on anabsolute magnitude of 7.89.^[5]

100+ largest Jupiter trojans

Largest Jupiter Trojans by survey^(A) (mean-diameter in kilometers; YoD: Year of Discovery)
Designation	H	WISE	IRAS	Akari	Ln	RP	V–I	YoD	Ref
624 Hektor	7.2	225	233	230.99	L4	6.92	0.930	1907	list
617 Patroclus	8.19	140.362	140.92	140.85	L5	102.80	0.830	1906	list
911 Agamemnon	7.89	131.038	166.66	185.30	L4	6.59	0.980	1919	list
588 Achilles	8.67	130.099	135.47	133.22	L4	7.31	0.940	1906	list
3451 Mentor	8.4	126.288	116.30	117.91	L5	7.70	0.770	1984	list
3317 Paris	8.3	118.790	116.26	120.45	L5	7.09	0.950	1984	list
1867 Deiphobus	8.3	118.220	122.67	131.31	L5	58.66	0.930	1971	list
1172 Äneas	8.33	118.020	142.82	148.66	L5	8.71	0.950	1930	list
1437 Diomedes	8.3	117.786	164.31	172.60	L4	24.49	0.810	1937	list
1143 Odysseus	7.93	114.624	125.64	130.81	L4	10.11	0.860	1930	list
2241 Alcathous	8.64	113.682	114.63	118.87	L5	7.69	0.940	1979	list
659 Nestor	8.99	112.320	108.87	107.06	L4	15.98	0.790	1908	list
3793 Leonteus	8.7	112.046	86.26	87.58	L4	5.62	0.780	1985	list
3063 Makhaon	8.4	111.655	116.14	114.34	L4	8.64	0.830	1983	list
1583 Antilochus	8.6	108.842	101.62	111.69	L4	31.54	0.950	1950	list
884 Priamus	8.81	101.093	96.29	119.99	L5	6.86	0.900	1917	list
1208 Troilus	8.99	100.477	103.34	111.36	L5	56.17	0.740	1931	list
1173 Anchises	8.89	99.549	126.27	120.49	L5	11.60	0.780	1930	list
2207 Antenor	8.89	97.658	85.11	91.32	L5	7.97	0.950	1977	list
2363 Cebriones	9.11	95.976	81.84	84.61	L5	20.05	0.910	1977	list
4063 Euforbo	8.7	95.619	102.46	106.38	L4	8.85	0.950	1989	list
2357 Phereclos	8.94	94.625	94.90	98.45	L5	14.39	0.960	1981	list
4709 Ennomos	8.5	91.433	80.85	80.03	L5	12.28	0.690	1988	list
2797 Teucer	8.7	89.430	111.14	113.99	L4	10.15	0.920	1981	list
2920 Automedon	8.8	88.574	111.01	113.11	L4	10.21	0.950	1981	list
15436 Dexius	9.1	87.646	85.71	78.63	L4	8.97	0.870	1998	list
3596 Meriones	9.2	87.380	75.09	73.28	L4	12.96	0.830	1985	list
2893 Peiroos	9.23	86.884	87.46	86.76	L5	8.96	0.950	1975	list
4086 Podalirius	9.1	85.495	86.89	85.98	L4	10.43	0.870	1985	list
4060 Deipylos	9.3	84.043	79.21	86.79	L4	9.30	0.760	1987	list
1404 Ajax	9.3	83.990	81.69	96.34	L4	29.38	0.960	1936	list
4348 Poulydamas	9.5	82.032	70.08	87.51	L5	9.91	0.840	1988	list
5144 Achates	9.0	80.958	91.91	89.85	L5	5.96	0.920	1991	list
4833 Meges	8.9	80.165	87.33	89.39	L4	14.25	0.940	1989	list
2223 Sarpedon	9.41	77.480	94.63	108.21	L5	22.74	0.880	1977	list
4489 Dracius	9.0	76.595	92.93	95.02	L4	12.58	0.950	1988	list
2260 Neoptolemus	9.31	76.435	71.65	81.28	L4	8.18	0.950	1975	list
5254 Ulysses	9.2	76.147	78.34	80.00	L4	28.72	0.970	1986	list
3708 Socus	9.3	75.661	79.59	76.75	L5	6.55	0.980	1974	list
2674 Pandarus	9.1	74.267	98.10	101.72	L5	8.48	1.000	1982	list
3564 Talthybius	9.4	73.730	68.92	74.11	L4	40.59	0.900	1985	list
4834 Thoas	9.1	72.331	86.82	96.21	L4	18.19	0.950	1989	list
7641 Cteatus	9.4	71.839	68.97	75.28	L4	27.77	0.980	1986	list
3540 Protesilaos	9.3	70.225	76.84	87.66	L4	8.95	0.940	1973	list
11395 Iphinous	9.8	68.977	64.71	67.78	L4	17.38	–	1998	list
4035 Thestor	9.6	68.733	68.23	66.99	L4	13.47	0.970	1986	list
5264 Telephus	9.4	68.472	73.26	81.38	L4	9.53	0.970	1991	list
1868 Thersites	9.5	68.163	70.08	78.89	L4	10.48	0.960	1960	list
9799 Thronium	9.6	68.033	64.87	72.42	L4	21.52	0.910	1996	list
4068 Menestheus	9.5	67.625	62.37	68.46	L4	14.40	0.950	1973	list
23135 Pheidas	9.9	66.230	58.29	68.50	L4	8.69	0.860	2000	list
2456 Palamedes	9.3	65.916	91.66	99.60	L4	7.24	0.920	1966	list
3709 Polypoites	9.1	65.297	99.09	85.23	L4	10.04	1.000	1985	list
1749 Telamon	9.5	64.898	81.06	69.14	L4	16.98	0.970	1949	list
3548 Eurybates	9.6	63.885	72.14	68.40	L4	8.71	0.730	1973	list
4543 Phoinix	9.7	63.836	62.79	69.54	L4	38.87	1.200	1989	list
12444 Prothoon	9.8	63.835	64.31	62.41	L5	15.82	–	1996	list
4836 Medon	9.5	63.277	67.73	78.70	L4	9.82	0.920	1989	list
16070 Charops	9.7	63.191	64.13	68.98	L5	20.24	0.960	1999	list
15440 Eioneus	9.6	62.519	66.48	71.88	L4	21.43	0.970	1998	list
4715 Medesicaste	9.7	62.097	63.91	65.93	L5	8.81	0.850	1989	list
34746 Thoon	9.8	61.684	60.51	63.63	L5	19.63	0.950	2001	list
38050 Bias	9.8	61.603	61.04	50.44	L4	18.85	0.990	1998	list
5130 Ilioneus	9.7	60.711	59.40	52.49	L5	14.77	0.960	1989	list
5027 Androgeos	9.6	59.786	57.86	n.a.	L4	11.38	0.910	1988	list
6090 Aulis	9.4	59.568	74.53	81.92	L4	18.48	0.980	1989	list
5648 Axius	9.7	59.295	63.91	n.a.	L5	37.56	0.900	1990	list
7119 Hiera	9.7	59.150	76.40	77.29	L4	400	0.950	1989	list
4805 Asteropaios	10.0	57.647	53.16	43.44	L5	12.37	–	1990	list
16974 Iphthime	9.8	57.341	55.43	57.15	L4	78.9	0.960	1998	list
4867 Polites	9.8	57.251	58.29	64.29	L5	11.24	1.010	1989	list
2895 Memnon	10.0	56.706	55.67	n.a.	L5	7.50	0.710	1981	list
4708 Polydoros	9.9	54.964	55.67	n.a.	L5	7.52	0.960	1988	list
21601 Aias	10.0	54.909	55.67	56.08	L4	12.65	0.970	1998	list
12929 Periboea	9.9	54.077	61.04	55.34	L5	9.27	0.880	1999	list
17492 Hippasos	10.0	53.975	55.67	n.a.	L5	17.75	–	1991	list
5652 Amphimachus	10.1	53.921	53.16	52.48	L4	8.37	1.050	1992	list
2759 Idomeneus	9.9	53.676	61.01	52.55	L4	32.38	0.910	1980	list
5258 Rhoeo	10.2	53.275	50.77	n.a.	L4	19.85	1.010	1989	list
12126 Chersidamas	10.1	53.202	n.a.	n.a.	L5	n.a.	?	1999	list
15502 Hypeirochus	10.0	53.100	55.67	50.86	L5	15.13	0.875	1999	list
4754 Panthoos	10.0	53.025	53.15	56.96	L5	27.68	–	1977	list
4832 Palinurus	10.0	52.058	53.16	n.a.	L5	5.32	1.000	1988	list
5126 Achaemenides	10.5	51.922	44.22	48.57	L4	53.02	–	1989	list
3240 Laocoon	10.2	51.695	50.77	n.a.	L5	11.31	0.880	1978	list
4902 Thessandrus	9.8	51.263	61.04	71.79	L4	738	0.960	1989	list
11552 Boucolion	10.1	51.136	53.16	53.91	L5	32.44	–	1993	list
20729 Opheltius	10.4	50.961	46.30	n.a.	L4	5.72	1.000	1999	list
6545 Leitus	10.1	50.951	53.16	n.a.	L4	16.26	0.910	1986	list
4792 Lykaon	10.1	50.870	53.16	n.a.	L5	40.09	0.960	1988	list
21900 Orus	10.0	50.810	55.67	53.87	L4	13.45	0.950	1999	list
1873 Agenor	10.1	50.799	53.76	54.38	L5	20.60	–	1971	list
5028 Halaesus	10.2	50.770	50.77	n.a.	L4	24.94	0.900	1988	list
2146 Stentor	9.9	50.755	58.29	n.a.	L4	16.40	–	1976	list
4722 Agelaos	10.0	50.378	53.16	59.47	L5	18.44	0.910	1977	list
5284 Orsilocus	10.1	50.159	53.16	n.a.	L4	10.31	0.970	1989	list
11509 Thersilochos	10.1	49.960	53.16	56.23	L5	17.37	–	1990	list
5285 Krethon	10.1	49.606	58.53	52.61	L4	12.04	1.090	1989	list
4791 Iphidamas	10.1	49.528	57.85	59.96	L5	9.70	1.030	1988	list
9023 Mnesthus	10.1	49.151	50.77	60.80	L5	30.66	–	1988	list
5283 Pyrrhus	9.7	48.356	64.58	69.93	L4	7.32	0.950	1989	list
4946 Askalaphus	10.2	48.209	52.71	66.10	L4	22.73	0.940	1988	list
22149 Cinyras	10.2	48.190	50.77	50.37	L4	7.84	1.090	2000	list
32496 Deïopites	10.2	48.017	50.77	51.63	L5	23.34	0.950	2000	list
5120 Bitias	10.2	47.987	50.77	n.a.	L5	15.21	0.780	1988	list
12714 Alkimos	10.1	47.819	61.04	54.62	L4	28.48	–	1991	list
7352 Hypsenor	9.9	47.731	55.67	47.07	L5	648	0.850	1994	list
1870 Glaukos	10.6	47.649	42.23	n.a.	L5	5.99	—	1971	list
4138 Kalchas	10.1	46.462	53.16	61.04	L4	29.2	0.810	1973	list
23958 Theronice	10.2	46.001	50.77	47.91	L4	562	0.990	1998	list
4828 Misenus	10.4	45.954	46.30	43.22	L5	12.87	0.920	1988	list
4057 Demophon	10.1	45.683	53.16	n.a.	L4	29.82	1.060	1985	list
4501 Eurypylos	10.4	45.524	46.30	n.a.	L4	6.05	–	1989	list
4007 Euryalos	10.3	45.515	48.48	53.89	L4	6.39	–	1973	list
5259 Epeigeus	10.3	44.741	42.59	44.42	L4	18.42	–	1989	list
30705 Idaios	10.4	44.546	46.30	n.a.	L5	15.74	–	1977	list
16560 Daitor	10.7	43.861	51.42	43.38	L5	–	–	1991	list
15977 Pyraechmes	10.4	43.530	46.30	51.53	L5	250	0.906	1998	list
7543 Prylis	10.6	42.893	42.23	n.a.	L4	17.80	–	1973	list
4827 Dares	10.5	42.770	44.22	n.a.	L5	19.00	–	1988	list
1647 Menelaus	10.5	42.716	44.22	n.a.	L4	17.74	0.866	1957	list
^(A) Used sources:WISE/NEOWISE catalog (NEOWISE_DIAM_V1 PDS,Grav, 2012);IRAS data (SIMPS v.6 catalog); andAkari catalog (Usui, 2011); RP:rotation period andV–I (color index) taken from theLCDB Note: missing data was completed with figures from the JPL SBDB (query) and from the LCDB (query form) for the WISE/NEOWISE and SIMPS catalogs, respectively. These figures are given in italics. Also, listing is incomplete above #100.

Shape and satellite

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A 2012 stellaroccultation produced a 2D shape model of roughly190.6 km × 143.8 km (with an irregular, skewed outline)^[10] and are suggestive ofAgamemnon to have asatellite of approximately5+5
−2 kilometers in diameter orbiting at278±5 km from the primary's center.^[9]

Naming

[edit]

Thisminor planet named fromGreek mythology after KingAgamemnon, the leader of the Greeks in theTrojan War. He is a main character of Homer'sIliad. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 88).^[3]

Notes

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^Lightcurve plots of (911) Agamemnon from March 2014 byRobert Stephens at the Center for Solar System Studies (U81) with a period of6.59±0.01 and an amplitude of 0.21 mag. Quality code is 3- (lightcurve rating at CS3). Summary figures at theLCDB andCS3.

References

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^^a ^b ^c ^d ^e"911 Agamemnon (1919 FD)".Minor Planet Center. Retrieved14 June 2018.
^Noah Webster (1884)A Practical Dictionary of the English Language
^^a ^b ^cSchmadel, Lutz D. (2007). "(911) Agamemnon".Dictionary of Minor Planet Names.Springer Berlin Heidelberg. p. 81.doi:10.1007/978-3-540-29925-7_912.ISBN 978-3-540-00238-3.
^^a ^b ^c ^d ^e"JPL Small-Body Database Browser: 911 Agamemnon (1919 FD)" (2018-05-25 last obs.).Jet Propulsion Laboratory. Retrieved14 June 2018.
^^a ^b ^c ^d ^e ^f"LCDB Data for (911) Agamemnon". Asteroid Lightcurve Database (LCDB). Retrieved14 June 2018.
^^a ^b"List of Jupiter Trojans".Minor Planet Center. 4 October 2017. Retrieved19 October 2017.
^^a ^b ^c"Asteroid (911) Agamemnon – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved6 June 2018.
^Browning (1877)The Agamemnon of Aeschylus
^^a ^b ^c ^dTimerson, Bradley; Brooks, John; Conard, Steven; Dunham, David W.; Herald, David; Tolea, Alin; et al. (October 2013). "Occultation evidence for a satellite of the Trojan asteroid (911) Agamemnon".Planetary and Space Science.87:78–84.arXiv:1310.3220.Bibcode:2013P&SS...87...78T.doi:10.1016/j.pss.2013.08.015.S2CID 119186462.
^^a ^b"Agamemnon profile predicted from distributedly observed occultations of the same star". IOTA (International Occultation Timing Association). 19 January 2012. Archived fromthe original on 3 March 2016. Retrieved4 March 2018.
^^a ^b ^c ^dGrav, 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. (online catalog)
^^a ^b ^c ^dTedesco, 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-V6.0.12: IRAS-A-FPA-3-RDR-IMPS-V6.0.Bibcode:2004PDSS...12.....T. Retrieved15 June 2018.
^^a ^b ^c ^dUsui, 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. (online,AcuA catalog p. 153)
^^a ^bMottola, 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.Bibcode:2011AJ....141..170M.doi:10.1088/0004-6256/141/5/170.
^French, Linda M.; Stephens, Robert D.; Coley, Daniel R.; Megna, Ralph; Wasserman, Lawrence H. (July 2012)."Photometry of 17 Jovian Trojan Asteroids".The Minor Planet Bulletin.39 (3):183–187.Bibcode:2012MPBu...39..183F.ISSN 1052-8091. Retrieved6 June 2018.
^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. Retrieved6 June 2018.
^Stephens, Robert D. (April 2009)."Asteroids Observed from GMARS and Santana Observatories".The Minor Planet Bulletin.36 (2):59–62.Bibcode:2009MPBu...36...59S.ISSN 1052-8091. Retrieved6 June 2018.
^^a ^bLazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004)."S3OS2: the visible spectroscopic survey of 820 asteroids"(PDF).Icarus.172 (1):179–220.Bibcode:2004Icar..172..179L.doi:10.1016/j.icarus.2004.06.006. Retrieved6 June 2018.
^^a ^b ^c ^d"Asteroid 911 Agamemnon".Small Bodies Data Ferret. Archived fromthe original on 6 April 2023. Retrieved6 June 2018.
^Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results".Icarus.261:34–47.arXiv:1506.00762.Bibcode:2015Icar..261...34V.doi:10.1016/j.icarus.2015.08.007.S2CID 53493339.

External links

[edit]

Does the asteroid Agamemnon have a satellite?:Steve Conard, Willow Oak Observatory onYouTube(time 3:07 min.)
Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at theWayback Machine)
Dictionary of Minor Planet Names, Google books
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
911 Agamemnon atAstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
911 Agamemnon at theJPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

Comets

Other

Authority control databases	JPL SBDB MPC

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