1437 Diomedes

1437 Diomedes

Discovery[1]
Discovered by	Karl Wilhelm Reinmuth
Discovery date	3 August 1937
Designations
Named after	Diomedes
Alternative names	1937 PB
Minor planet category	Jupiter trojan
Orbital characteristics[1][2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	78.01 yr (28494 days)
Aphelion	5.4237 AU (811.37 Gm)
Perihelion	4.9654 AU (742.81 Gm)
Semi-major axis	5.1946 AU (777.10 Gm)
Eccentricity	0.044112
Orbital period	11.84 yr (4324.39 d)
Average orbital speed	13.10 km/s
Mean anomaly	183.828°
Mean motion	0° 4^m 59.696^s / day
Inclination	20.491°
Longitude of ascending node	315.792°
Argument of perihelion	131.59°
Earth MOID	4.01036 AU (599.941 Gm)
Jupiter MOID	0.271727 AU (40.6498 Gm)
Jupiter Tisserand parameter	2.872
Physical characteristics
Dimensions	164.3±4.1 km (IRAS)[1] ~ (284 × 126 × 65)[3]
Mean radius	82.155±2.05 km
Rotation period	24.49 h (1.020 d)
Sidereal rotation period	24.46 hr [1]
Geometric albedo	0.0313±0.002 [1]
Temperature	~ 122 K
Absolute magnitude (H)	8.30 [1]

1437 Diomedes is a Jupiter trojan orbiting near the L₄ Lagrangian point of the Sun–Jupiter system, i.e. "Greek Camp". Based on IRAS data, Diomedes is 164 km in diameter, the third-largest Jupiter trojan.^[4] It was discovered by Karl Wilhelm Reinmuth on 3 August 1937, in Heidelberg, Germany^[1] and named after the Greek hero Diomedes

The largest Jupiter trojans

Trojan	Diameter (km)
624 Hektor	225
911 Agamemnon	167
1437 Diomedes	164
1172 Äneas	143
617 Patroclus	141
588 Achilles	135
1173 Anchises	126
1143 Odysseus	126
Source: JPL Small-Body Database, IRAS data

References

1. "JPL Small-Body Database Browser: 1437 Diomedes (1937 PB)" (2008-01-18 last obs). Retrieved 27 April 2016.
2. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
3. Sato, Isao; Šarounová, Lenka; Fukushima, Hideo (2000). "Size and Shape of Trojan Asteroid Diomedes from Its Occultation and Photometry". Icarus 145 (1): 25–32. Bibcode:2000Icar..145...25S. doi:10.1006/icar.1999.6316.
4. "JPL Small-Body Database Search Engine: orbital class (TJN) and diameter > 50 (km)". JPL's Solar System Dynamics Group. Retrieved 2012-03-28.

External links

• Orbital simulation from JPL (Java) / Ephemeris
• Size and Shape of Trojan Asteroid Diomedes from Its Occultation and Photometry (284×126×65)
• 1437 Diomedes at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters