6144 Kondojiro

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.

6144 Kondojiro

Discovery
Discovered by	K. Endate, K. Watanabe
Discovery site	Kitami
Discovery date	14 March 1994
Designations
MPC designation	(6144) Kondojiro
Named after	Jiro Kondo
Alternative designations	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)
Aphelion	6.47345 AU (968.414 Gm) (Q)
Perihelion	3.03222 AU (453.614 Gm) (q)
Semi-major axis	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° 5^m 42.435^s / day (n)
Inclination	5.88716° (i)
Longitude of ascending node	117.14167° (Ω)
Argument of perihelion	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]
Spectral type	D[4]
Absolute magnitude (H)	11.6

Orbit and classification

The orbit of 6144 Kondojiro compared to that of Jupiter and the inner planets

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

• List of minor planets
• 944 Hidalgo
• 3552 Don Quixote

References

1. "JPL Small-Body Database Browser: 6144 Kondojiro (1994 EQ3)". 14 August 2015. Retrieved 19 November 2015.
2. J. Licandro, 2015, "Size and albedo distributions of asteroids in cometary orbits using WISE data"
3. Behrend, Raoul. "Asteroids and comets rotation curves – (6144) Kondojiro". Geneva Observatory. Retrieved 6 January 2016.
4. M. Ishiguro, 2014, "Physical Properties of Asteroids in Comet-like Orbits in Infrared Asteroid Survey Catalogs"
5. "IAU Minor Planet Center - (6144) Kondojiro". Minor Planet Center. Retrieved 19 November 2015.
6. "JPL Small-Body Database Search Engine: orbital class (AST) and data-arc span > 30 (d)". Jet Propulsion Laboratory Solar System Dynamics. Retrieved 2 March 2018.

External links

• 6144 Kondojiro at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 6144 Kondojiro at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters