100 Hekate

100 Hekate
Discovery
Discovered by J. C. Watson
Discovery date July 11, 1868
Designations
Alternative names 1955 QA
Minor planet
category
Main belt
Orbital characteristics
Epoch November 26, 2005 (JD 2453700.5)
Aphelion 539.149 Gm (3.604 AU)
Perihelion 386.502 Gm (2.584 AU)
Semi-major axis 462.825 Gm (3.094 AU)
Eccentricity 0.165
Orbital period 1987.636 d (5.44 a)
Average orbital speed 16.82 km/s
Mean anomaly 76.006°
Inclination 6.430°
Longitude of ascending node 127.343°
Argument of perihelion 185.908°
Physical characteristics
Dimensions 89 km[1]
Mass ~1.0×1018 kg (estimate)
Mean density ~2.7 g/cm³ (estimate)[3]
Equatorial surface gravity ~0.033 m/s² (estimate)
Escape velocity ~0.054 km/s (estimate)
Rotation period 0.5555 d [2]
Albedo 0.192 [1]
Temperature ~154 K
max: 238K (-35° C)
Spectral type S-type asteroid
Absolute magnitude 7.67

100 Hekate (hek'-ə-tee, IPA: /ˈhɛkəti/) is a large Main belt asteroid. It orbits in the same region of space as the Hygiea asteroid family, however it is actually an unrelated interloper. Its albedo of 0.19 is too high, and it is of the wrong spectral class to be part of the dark carbonaceous Hygiea family.

Hekate was the 100th asteroid to be discovered, by J. C. Watson on July 11, 1868. It is named after Hecate, the goddess of witchcraft in Greek mythology, but its name also commemorates it as the hundredth asteroid, as hekaton is Greek for 'hundred'.

A Hekatean occultation of a star was observed on July 14, 2003 from New Zealand.

References

1.

Supplemental IRAS Minor Planet Survey. Archived from the original on 2004-12-26.

2. PDS lightcurve data

3.

G. A. Krasinsky et al Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).













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