Astronomy:6144 Kondojiro
| Discovery | |
|---|---|
| Discovered by | K. Endate, K. Watanabe |
| Discovery site | Kitami |
| Discovery date | 14 March 1994 |
| Designations | |
| (6144) Kondojiro | |
| Named after | Jiro Kondo |
| 1994 EQ3, 1937 JF, 1937 JQ, 1984 FW1 | |
| Minor planet category | Jupiter-crosser asteroid |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 22150 days (60.64 yr) |
| |{{{apsis}}}|helion}} | 6.47345 astronomical unit|AU (968.414 Gm) (Q) |
| |{{{apsis}}}|helion}} | 3.03222 AU (453.614 Gm) (q) |
| 4.75283 AU (711.013 Gm) (a) | |
| Eccentricity | 0.36202 (e) |
| Orbital period | 10.36 yr (3784.66 d) |
| Mean anomaly | 34.71927° (M) |
| Mean motion | 0° 5m 42.435s / day (n) |
| Inclination | 5.88716° (i) |
| Longitude of ascending node | 117.14167° (Ω) |
| 96.127254° (ω) | |
| Earth MOID | 2.03358 AU (304.219 Gm) |
| Jupiter MOID | 0.204605 AU (30.6085 Gm) |
| TJupiter | 2.867 |
| Physical characteristics | |
| Dimensions | 32.9±5.1 km[2] |
| Rotation period | 4.0±2 h[1][3] |
| Geometric albedo | 0.044±0.009[2] |
| D[4] | |
| Absolute magnitude (H) | 11.6 |
6144 Kondojiro (1994 EQ3) is an asteroid discovered on March 14, 1994 by Kin Endate and Kazuro Watanabe at the Kitami Observatory in eastern Hokkaidō, Japan . It is named after Jiro Kondo, a Japanese Egyptologist and professor of archaeology at Waseda University.
Orbit and classification
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The orbit of 6144 Kondojiro is unusual for a number of reasons, including:
- An eccentricity greater than 0.3,
- A semi-major axis between that of an outer main-belt asteroid (3.2 AU < a < 4.6 AU) and a Jupiter trojan (4.6 AU < a < 5.5 AU),
- A relatively low inclination for a Jupiter-crossing minor planet, and
- A lack of proper orbital elements due to recurring perturbations by Jupiter.
It is difficult to classify an object with such a peculiar orbit using a conventional definition. Despite this, the Minor Planet Center (MPC) lists it as a main-belt asteroid,[5] even though both the orbital and physical properties of 6144 Kondojiro suggest that it may be an extinct comet rather than a true asteroid.[4] The JPL Small-Body Database lists only 33 such objects that have an observation arc greater than 30 days.[6]
See also
References
- ↑ 1.0 1.1 "JPL Small-Body Database Browser: 6144 Kondojiro (1994 EQ3)". 14 August 2015. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=6144.
- ↑ 2.0 2.1 J. Licandro, 2015, "Size and albedo distributions of asteroids in cometary orbits using WISE data"
- ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (6144) Kondojiro". Geneva Observatory. http://obswww.unige.ch/~behrend/page5cou.html#006144.
- ↑ 4.0 4.1 M. Ishiguro, 2014, "Physical Properties of Asteroids in Comet-like Orbits in Infrared Asteroid Survey Catalogs"
- ↑ "IAU Minor Planet Center - (6144) Kondojiro". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=6144.
- ↑ "JPL Small-Body Database Search Engine: orbital class (AST) and data-arc span > 30 (d)". Jet Propulsion Laboratory Solar System Dynamics. http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;ast_orbit_class=AST;OBJ_field=0;ORB_field=0;c1_group=ORB;c1_item=Ck;c1_op=%3E;c1_value=30;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsCkCqAi;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AcA.
External links
- 6144 Kondojiro at AstDyS-2, Asteroids—Dynamic Site
- 6144 Kondojiro at the JPL Small-Body Database
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