1867 Deiphobus
Discovery [1] | |
---|---|
Discovered by |
C. U. Cesco A. G. Samuel |
Discovery site | El Leoncito Complex |
Discovery date | 3 March 1971 |
Designations | |
MPC designation | (1867) Deiphobus |
Pronunciation | /diˈɪfəbəs/ · dee-IF-ə-bəs |
Named after | Deiphobus (Greek mythology)[2] |
1971 EA | |
Jupiter trojan [1][3][4] Trojan [5][6] · Ennomos [7] | |
Orbital characteristics [3] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 46.15 yr (16,858 days) |
Aphelion | 5.3511 AU |
Perihelion | 4.9040 AU |
5.1276 AU | |
Eccentricity | 0.0436 |
11.61 yr (4,241 days) | |
229.96° | |
0° 5m 5.64s / day | |
Inclination | 26.914° |
283.71° | |
359.19° | |
Jupiter MOID | 0.1574 AU |
TJupiter | 2.7830 |
Physical characteristics | |
Mean diameter |
±1.62 km 118.22[8] km 122.65(derived)[4] ±3.9 km 122.67[9] ±1.87 km 131.31[10] |
±0.03 h 58.62[11][lower-alpha 1] ±0.18 h 58.66[12] ±0.002 h 58.699[13][lower-alpha 1] | |
±0.001 0.037[10] 0.0396 (derived)[4] ±0.003 0.0422[9] ±0.009 0.060[8] | |
D (Tholen)[7] D0 (Barucci)[7] D (Tedesco)[7] D (SDSS-MOC)[14] U–B = ±0.060 0.232[7] B–V = ±0.050 0.760[15] V–R = ±0.050 0.460[15] V–I = ±0.027 0.930[4] | |
8.3[1][3][8] ±0.10 8.47[16] 8.61[9][10] 8.68[4][17] | |
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1867 Deiphobus (/diˈɪfəbəs/ dee-IF-ə-bəs), provisional designation 1971 EA, is a dark Jupiter trojan from the Trojan camp, approximately 123 kilometers (76 mi) in diameter. It was discovered on 3 March 1971, by Argentine astronomers Carlos Cesco and A. G. Samuel at the Leoncito Astronomical Complex in Argentina,[1] and later named after the Trojan prince Deiphobus from Greek mythology.[2] The dark D-type asteroid is one of the largest Jupiter trojans. It is a member of the Ennomos family and has a long rotation period of 58.66 hours.[4]
Orbit and classification
Deiphobus is a dark Jovian asteroid orbiting in the trailering Trojan camp at Jupiter's L5 Lagrangian point, 60° behind on the Gas Giant's orbit in a 1:1 resonance . It is a member of the Ennomos family (009),[7] a small Jovian asteroid family with 30 known members, named after 4709 Ennomos.[18]:23 There only a few Jovian families known to date. The Ennomos family was first identified by Jakub Rozehnal and Miroslav Brož in 2011.[19] However, a different HCM-based analysis assigns Deiphobus to the Jovian background population.[6]
It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 7 months (4,241 days; semi-major axis of 5.13 AU). Its orbit has an eccentricity of 0.04 and an inclination of 27° with respect to the ecliptic.[3] The body's observation arc begins with its official discovery observation at Leoncito in March 1971.[1]
Physical characteristics
Trojan | Diameter (km) |
---|---|
624 Hektor | 225 |
617 Patroclus | 140 |
911 Agamemnon | 131 |
588 Achilles | 130 |
3451 Mentor | 126 |
3317 Paris | 119 |
1867 Deiphobus | 118 |
1172 Äneas | 118 |
1437 Diomedes | 118 |
1143 Odysseus | 115 |
Source: JPL Small-Body Database, NEOWISE data |
Deiphobus is characterized as a dark D-type asteroid in the Tholen, Barucci, Tedesco, as well as in the SDSS-based taxonomy.[7][14]
Lightcurves
Several rotational lightcurve have been obtained since 1987, when the first photometric observations of Deiphobus by Linda French at CTIO indicated that the body has longer-than average rotation period of at least 24 hours.(U=2).[4][17] In February 1994, observations by Stefano Mottola and Anders Erikson, using the ESO 1-metre telescope at La Silla Observatory in Chile, gave a slow rotation period of ±0.18 hours with a brightness variation of 58.66±0.03 0.27magnitude (U=3-).[4][12]
Since 2015, follow-up observations by Robert Stephens at the Center for Solar System Studies measured 58.62 and 58.699, confirming Mottola's long period (U=3-/3-),[11][13][lower-alpha 1] and superseding other reported periods from fragmentary lightcurves (U=2/1).[20][lower-alpha 2]
While not being a slow rotator, Deiphobus has a much longer rotation period than the vast majority of asteroids, which typically rotate between 2 and 20 hours once around their axis. Among all large Jovian asteroids, only 617 Patroclus has a longer period than Deiphobus.
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Deiphobus measures between 118.22 and 131.31 kilometers in diameter, and its surface has an albedo between 0.037 and 0.060.[8][9][10] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0396 and a diameter of 122.65 kilometers based on an absolute magnitude of 8.68.[4]
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Naming
This minor planet was named after the Trojan warrior, Deiphobus, son of King Priam (also see 108 Hecuba and 884 Priamus).[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3935).[21]
Notes
- 1 2 3 Lightcurve plots of (1867) Deiphobus from Nov 2015, Feb 2017 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is 3/3- (lightcurve rating at CS3). Summary figures at the LCDB and CS3.
- ↑ Melita (2012), gives a rotation period of ±0.05. Summary figures listed at 51.70LCDB
References
- 1 2 3 4 5 "1867 Deiphobus (1971 EA)". Minor Planet Center. Retrieved 13 June 2018.
- 1 2 3 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1867) Deiphobus. Springer Berlin Heidelberg. p. 150. ISBN 978-3-540-00238-3. Retrieved 12 December 2016.
- 1 2 3 4 "JPL Small-Body Database Browser: 1867 Deiphobus (1971 EA)" (2017-04-28 last obs.). Jet Propulsion Laboratory. Retrieved 9 June 2017.
- 1 2 3 4 5 6 7 8 9 "LCDB Data for (1867) Deiphobus". Asteroid Lightcurve Database (LCDB). Retrieved 13 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 20 August 2016. Retrieved 12 December 2016.
- 1 2 "Asteroid (1867) Deiphobus – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 13 June 2018.
- 1 2 3 4 5 6 7 "Asteroid 1867 Deiphobus". Small Bodies Data Ferret. Retrieved 13 June 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" (PDF). The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 13 June 2018. (online catalog)
- 1 2 3 4 Tedesco, 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. Bibcode:2004PDSS...12.....T. Retrieved 15 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 13 June 2018. (online, AcuA catalog p. 153)
- 1 2 Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2016). "A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (3): 265–270. Bibcode:2016MPBu...43..265S. ISSN 1052-8091. Retrieved 12 December 2016.
- 1 2 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. Retrieved 12 December 2016.
- 1 2 Stephens, Robert D.; Coley, Daniel R. (July 2017). "Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March". The Minor Planet Bulletin. 44 (3): 252–257. Bibcode:2017MPBu...44..252S. ISSN 1052-8091. Retrieved 13 June 2018.
- 1 2 Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 15 June 2018.
- 1 2 Chatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016). "Photometric colors of the brightest members of the Jupiter L5 Trojan cloud". Icarus. 271: 158–169. Bibcode:2016Icar..271..158C. doi:10.1016/j.icarus.2016.01.026. Retrieved 13 June 2016.
- ↑ 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" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 13 June 2018.
- 1 2 French, L. M. (November 1987). "Rotation properties of four L5 Trojan asteroids from CCD photometry". Icarus: 325–341.MIT–supportedresearch. Bibcode:1987Icar...72..325F. doi:10.1016/0019-1035(87)90178-3. ISSN 0019-1035. Retrieved 12 December 2016.
- ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 13 June 2018.
- ↑ Broz, M.; Rozehnal, J. (June 2011). "Eurybates – the only asteroid family among Trojans?" (PDF). Monthly Notices of the Royal Astronomical Society. 414 (1): 565–574. arXiv:1109.1109. Bibcode:2011MNRAS.414..565B. doi:10.1111/j.1365-2966.2011.18420.x. Retrieved 13 June 2018.
- ↑ 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. Retrieved 12 December 2016.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 13 June 2018.
External links
- Long-term evolution of asteroid families among Jovian Trojans, Jakub Rozehnal and Miroslav Brož (2014)
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1867 Deiphobus at AstDyS-2, Asteroids—Dynamic Site
- 1867 Deiphobus at the JPL Small-Body Database