1868 Thersites

1868 Thersites
Discovery [1]
Discovered by	C. J. van Houten; I. van Houten G.; T. Gehrels
Discovery site	Palomar Obs.
Discovery date	24 September 1960
Designations
MPC designation	(1868) Thersites
Pronunciation	/θərˈsaɪtiːz/[2]
Named after	Thersites [3]; (Greek mythology)
Alternative designations	2008 P-L · 1972 RB2
Minor planet category	Jupiter trojan [1][4][5]; Greek [6][7] · background [7]
Orbital characteristics [4]
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 0
Observation arc	63.50 yr (23,195 d)
Aphelion	5.9015 AU
Perihelion	4.7316 AU
Semi-major axis	5.3166 AU
Eccentricity	0.1100
Orbital period	12.26 yr (4,478 d)
Mean anomaly	277.51°
Mean motion	0° 4m 49.44s / day
Inclination	16.751°
Longitude of ascending node	197.82°
Argument of perihelion	169.76°
Jupiter MOID	0.2116 AU
TJupiter	2.9030
Physical characteristics
Mean diameter	68.16±0.81 km[8]; 70.08 km (calculated)[5]; 78.89±2.02 km[9]
Rotation period	10.412±0.003 h[lower-alpha 1]; 10.416±0.014 h[10]; 10.48±0.01 h[11][lower-alpha 2]
Geometric albedo	0.055±0.003[9]; 0.055±0.008[8]; 0.057 (assumed)[5]
Spectral type	C (assumed)[5]; V–I = 0.960±0.034[5]
Absolute magnitude (H)	9.30[9]; 9.5[1][4][5]; 9.6[8]

1868 Thersites /θərˈsaɪtiːz/ is a large Jupiter trojan from the Greek camp, approximately 70 kilometers (43 miles) in diameter. Discovered during the Palomar–Leiden survey at Palomar in 1960, it was later named after the warrior Thersites from Greek mythology. The presumed carbonaceous C-type asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 10.48 hours.[5]

Discovery

Thersites was discovered on 24 September 1960, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Tom Gehrels at the Palomar Observatory in California.[1] On the same day, the group discovered another Jupiter trojan, 1869 Philoctetes.

The body's observation arc begins with a precovery taken at Palomar in March 1954, more than 6 years prior to its official discovery observation.[1]

Palomar–Leiden survey

The provisional survey designation "P-L" stands for Palomar–Leiden, named after the Palomar and Leiden observatories, which collaborated on the fruitful Palomar–Leiden survey in 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 Cornelis and Ingrid van Houten at Leiden Observatory, where astrometry was carried out. The trio are credited with the discovery of several thousand minor planets.[12]

Orbit and classification

Thersites 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 (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population.[7][13] It orbits the Sun at a distance of 4.7–5.9 AU once every 12 years and 3 months (4,478 days; semi-major axis of 5.32 AU). Its orbit has an eccentricity of 0.11 and an inclination of 17° with respect to the ecliptic.[4]

Physical characteristics

The Trojan asteroid has been assumed to be a carbonaceous C-type asteroid.[5]

Rotation period

In July 1994, a first rotational lightcurve of Thersites was obtained from photometric observations by Italian astronomer Stefano Mottola using the former Dutch 0.9-metre Telescope at ESO's La Silla Observatory in northern Chile. Lightcurve analysis gave a rotation period of 10.416±0.014 hours with a brightness variation of 0.14±0.01 magnitude (U=2+).[5][10] The best-rated lightcurve by Robert Stephens at the Center for Solar System Studies from June 2016 gave a period of 10.48 hours and an amplitude of 0.27 magnitude (U=3-).[5][11][lower-alpha 2] Follow-up observation in 2017 gave a similar period of 10.412 hours (U=2).[lower-alpha 1]

Diameter and albedo

According to the space-based surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Thersites has a low albedo of 0.055 and measures 78.9 and 68.2 kilometers in diameter, respectively.[8][9] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057, and calculates an intermediate diameter of 70.08 kilometers with an absolute magnitude of 9.5.[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) 1998 VU30	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) 1988 AK	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) 1974 FV1	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) 1986 TT6	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) 1998 XN77	9.8	68.977	64.71	67.78	L4	17.38	–	1998	list
(4035) 1986 WD	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) 1996 RJ	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) 2000 AN146	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) 1999 RB101	9.7	63.191	64.13	68.98	L5	20.24	0.960	1999	list
(15440) 1998 WX4	9.6	62.519	66.48	71.88	L4	21.43	0.970	1998	list
(4715) 1989 TS1	9.7	62.097	63.91	65.93	L5	8.81	0.850	1989	list
(34746) 2001 QE91	9.8	61.684	60.51	63.63	L5	19.63	0.950	2001	list
(38050) 1998 VR38	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) 1989 DJ	9.4	59.568	74.53	81.92	L4	18.48	0.980	1989	list
(5648) 1990 VU1	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) 1998 XO89	10.0	54.909	55.67	56.08	L4	12.65	0.970	1998	list
(12929) 1999 TZ1	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) 1989 AU1	10.2	53.275	50.77	n.a.	L4	19.85	1.010	1989	list
(12126) 1999 RM11	10.1	53.202	n.a.	n.a.	L5	n.a.	?	1999	list
(15502) 1999 NV27	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) 1999 XS143	10.4	50.961	46.30	n.a.	L4	5.72	1.000	1999	list
(6545) 1986 TR6	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) 2000 WD49	10.2	48.190	50.77	50.37	L4	7.84	1.090	2000	list
(32496) 2000 WX182	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) 1994 CO	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) 1998 VD30	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) 1998 MA11	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); and Akari catalog (Usui, 2011); RP: rotation period and V–I (color index) taken from the LCDB 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.

Naming

This minor planet was named from Greek mythology after Thersites, a Greek warrior who wanted to abandon Troy's siege during the Trojan War and head home. The given name also refers to the fact, that the asteroid was discovered farthest from the L₄ Lagrangian point.[3] The official naming citation was published by the Minor Planet Center on 1 June 1975 (M.P.C. 3826).[14]

Notes

Stephens (2017). Observations from July 2017. (lightcurve plot) Rotation period 10.412±0.003 hours with a brightness amplitude of 0.18±0.01 mag. Quality code of 2. Summary figures for (1868) Thersites at the LCDB.
Lightcurve plot of (1868) Thersites (July 2016) Rotation period 10.48±0.01 hours with a brightness amplitude of 0.27±0.02 mag. Quality code is 3-. Summary figures for at the LCDB.

References

"1868 Thersites (2008 P-L)". Minor Planet Center. Retrieved 9 June 2018.
Noah Webster (1884) A Practical Dictionary of the English Language
Schmadel, Lutz D. (2007). "(1868) Thersites". Dictionary of Minor Planet Names – (1868) Thersites. Springer Berlin Heidelberg. p. 150. doi:10.1007/978-3-540-29925-7_1869. ISBN 978-3-540-00238-3.
"JPL Small-Body Database Browser: 1868 Thersites (2008 P-L)" (2017-09-28 last obs.). Jet Propulsion Laboratory. Retrieved 9 June 2018.
"LCDB Data for (1868) Thersites". Asteroid Lightcurve Database (LCDB). Retrieved 9 June 2018.
"List of Jupiter Trojans". Minor Planet Center. 31 May 2018. Retrieved 9 June 2018.
"Asteroid (1868) Thersites". AstDyS-2, Asteroids – Dynamic Site. Retrieved 20 October 2019.
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. (online catalog)
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 15 June 2018. (online, AcuA catalog p. 153)
Mottola, 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.
Stephens, Robert D.; Coley, Daniel R.; Warner, Brian D.; French, Linda, M. (October 2016). "Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies". The Minor Planet Bulletin. 43 (4): 323–331. Bibcode:2016MPBu...43..323S. ISSN 1052-8091. Retrieved 9 June 2018.
"Minor Planet Discoverers". Minor Planet Center. 31 May 2018. Retrieved 9 June 2018.
"Asteroid 1868 Thersites". Small Bodies Data Ferret. Retrieved 9 June 2018.
Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

External links

Asteroid Lightcurve Database (LCDB), query form (info)
Dictionary of Minor Planet Names, Google books
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
1868 Thersites at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1868 Thersites at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[lcdb-Stephens-2017-10] Stephens (2017). Observations from July 2017. (lightcurve plot) Rotation period 10.412±0.003 hours with a brightness amplitude of 0.18±0.01 mag. Quality code of 2. Summary figures for (1868) Thersites at the LCDB.

[lightcurve-plot-Stephens-2016-13] Lightcurve plot of (1868) Thersites (July 2016) Rotation period 10.48±0.01 hours with a brightness amplitude of 0.27±0.02 mag. Quality code is 3-. Summary figures for at the LCDB.

[MPC-object-1] "1868 Thersites (2008 P-L)". Minor Planet Center. Retrieved 9 June 2018.

[2] Noah Webster (1884) A Practical Dictionary of the English Language

[springer-3] Schmadel, Lutz D. (2007). "(1868) Thersites". Dictionary of Minor Planet Names – (1868) Thersites. Springer Berlin Heidelberg. p. 150. doi:10.1007/978-3-540-29925-7_1869. ISBN 978-3-540-00238-3.

[jpldata-4] "JPL Small-Body Database Browser: 1868 Thersites (2008 P-L)" (2017-09-28 last obs.). Jet Propulsion Laboratory. Retrieved 9 June 2018.

[lcdb-5] "LCDB Data for (1868) Thersites". Asteroid Lightcurve Database (LCDB). Retrieved 9 June 2018.

[MPC-Jupiter-Trojans-6] "List of Jupiter Trojans". Minor Planet Center. 31 May 2018. Retrieved 9 June 2018.

[AstDys-object-7] "Asteroid (1868) Thersites". AstDyS-2, Asteroids – Dynamic Site. Retrieved 20 October 2019.

[Grav-2012-8] 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. (online catalog)

[AKARI-9] 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 15 June 2018. (online, AcuA catalog p. 153)

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