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5143 Heracles

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5143 Heracles
Discovery 
Discovered byC. Shoemaker
Discovery sitePalomar Obs.
Discovery date7 November 1991
Designations
MPC designation(5143) Heracles
Pronunciation/ˈhɛrəkliːz/
Named afterἩρακλῆς Hēraklēs (Greek mythology)
Alternative designations1991 VL · 1962 PG
Minor planet categoryApollo · NEO 
AdjectivesHeraclean /hɛrəˈkliːən/
Orbital characteristics 
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.58 yr (23,224 days)
Earliest precovery date30 November 1953
Aphelion3.2494 AU
Perihelion0.4174 AU
Semi-major axis1.8334 AU
Eccentricity0.7723
Orbital period (sidereal)2.48 yr (907 days)
Mean anomaly93.744°
Mean motion0° 23 49.2 / day
Inclination9.0330°
Longitude of ascending node309.52°
Argument of perihelion227.77°
Known satellites1 (0.6±0.3 km; orb. 17 h)
Earth MOID0.0584 AU · 22.8 LD
Physical characteristics
Dimensions3.26 km
3.28±0.09 km
3.41 km
4.5±0.7 km
4.83 km (taken)
4.833 km
4.843±0.378 km
Synodic rotation period2.704±0.002 h
2.7060±0.0002 h
2.706±0.001 h
2.7063 h
2.7065±0.0005 h
3.0149±0.0002 h
5.990±0.0111 h
Geometric albedo0.1481
0.20±0.05
0.227±0.054
0.38
0.40±0.22
0.412±0.030
0.42
Spectral typeSMASS = O 
Q  · C  · O 
V–R = 0.420±0.070
Absolute magnitude (H)13.786±0.004 (R) · 13.8 · 14.0 · 14.10±0.04 · 14.27 · 14.27±0.09 · 14.52±0.02 (R)

5143 Heracles (provisional designation 1991 VL) is a highly eccentric, rare-type asteroid and synchronous binary system, classified as near-Earth object of the Apollo group, approximately 4.8 kilometers in diameter. The asteroid was discovered on 7 November 1991, by American astronomer Carolyn Shoemaker at Palomar Observatory in California, United States. It is named for the Greek divine hero Heracles. It has an Earth minimum orbit intersection distance of 0.058 AU (8.7 million km) and is associated with the Beta Taurids daytime meteor shower.

Classification and orbit

Heracles orbits the Sun in the inner main-belt at a distance of 0.4–3.2 AU once every 2 years and 6 months (907 days). Its orbit has an eccentricity of 0.77 and an inclination of 9° with respect to the ecliptic. The first precovery was taken at Palomar during the Digitized Sky Survey in 1953, extending the body's observation arc by 38 years prior to its official discovery observation.

Due to its high eccentricity, Heracles is also a Mercury-grazer and a Mars-crosser. It has a minimum orbital intersection distance with Earth of 0.0584 AU (8,740,000 km) which corresponds to 22.8 lunar distances.

Physical characteristics

Spectral type

In the SMASS taxonomy, Heracles is a rare O-type asteroid, which have spectra similar to those of stony chondritic meteorites of the L6 and LL6 type. However, it has also been characterized as a carbonaceous C-type, as well as a stony Sk and Q-type asteroid.

Lightcurves

A large number of rotational lightcurves of Heracles were obtained from photometric observations between 2006 and 2016. Lightcurve data gives a rotation period between 2.7051 and 2.7065 hours with a brightness variation of 0.05 to 0.20 magnitude (U=3/3/3/3/3-).

Diameters

According to the surveys carried out by the Spitzer Space Telescope, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 3.26 and 4.843 kilometers in diameter, and its surface has an albedo between 0.20 and 0.24. The Collaborative Asteroid Lightcurve Link adopts the results from Petr Pravec's revised WISE data, that is, an albedo of 0.1481 and a diameter of 4.83 kilometers with an absolute magnitude of 14.27.

Binary system

On 12 July 2012, it was announced that Heracles is an assumed synchronous binary asteroid with a minor-planet moon orbiting its primary in a retrograde motion approximately every 16 hours. The companion was discovered in December 2011, by a team of astronomers using radar observations from Arecibo Observatory in Puerto Rico, following months of intensive photometric lightcurve observations (see above). It was designated S/2011 (5143) 1.

The satellite received the nickname Omphale, after the wife of Heracles who birth to his children. A longer orbital period of 40–57 hours cannot be excluded, which would then no longer be a synchronous system. Estimated diameters for Heracles and its moon are 3.6±1.2 and 0.6±0.3 kilometer, respectively.

Follow-up observations in 2016 confirmed an orbital period of 17 hours for the asteroid moon.

Naming

This minor planet was named after Heracles, the divine gatekeeper of Mount Olympus and one of the greatest heroes in Greek mythology, known for his strength and his Twelve Labors. Heracles is the son of Zeus and Alcmena, after whom the asteroids 5731 Zeus and 82 Alkmene were named. In the Roman adaptation, Heracles is known as Hercules. The approved naming citation was published by the Minor Planet Center on 14 July 1992 (M.P.C. 20523).

Notes

  1. ^ Warner (2017c): lightcurve plot of (5143) Heracles, with a rotation period 2.704±0.002 hours and a brightness amplitude of 0.15 mag (Quality Code of 2; 133 points). Observations from 12 to 17 September 2016, at CS3-Palmer Divide Station. Summary figures at Collaborative Asteroid Lightcurve Link (CALL)

References

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