90 Antiope

90 Antiope

Adaptive-optics image of Antiope
Discovery [1] and designation
Discovered by	Robert Luther
Discovery date	October 1, 1866
Designations
Alternate name(s)	1952 BK2[1]
Minor planet category	Main belt[1] (Themis family)
Orbital characteristics[1]
Epoch July 23, 2010 (JD 2455400.5)
Aphelion	545.94 Gm 3.6494 AU
Perihelion	398.02 Gm 2.6606 AU
Semi-major axis	471.19 Gm 3.1550 AU
Eccentricity	0.15670
Orbital period	2046.9 d (5.60 yr)
Average orbital speed	16.66 km/s
Mean anomaly	304.12°
Inclination	2.2195°
Longitude of ascending node	70.21°
Argument of perihelion	242.96°
Proper orbital elements
Physical characteristics
Dimensions	93.0×87.0×83.6 km[2] 87.8 ± 1.0 km[2]
Mass	8.3×1017 kg (whole system)[3] ~ 4.1−4.2 ×1017 kg (components)
Mean density	1.25 ± 0.05 g/cm³ (each)[4]
Equatorial surface gravity	variable; ~ 0.03−0.04 m/s²
Equatorial escape velocity	variable; ~ 35−40 m/s
Rotation period	0.687 d (16.50 h)[5] (synchronous)
Geometric albedo	0.060[6]
Surface temp.    Kelvin    Celsius	min mean max ~158 K 244 K -115 C -29°
Spectral type	C[7]
Absolute magnitude (H)	8.27 (together)[1] 9.02 (each component)

90 Antiope ( /ænˈtaɪ.əpiː/ an-TY-ə-pee) is a double asteroid in the outer asteroid belt. It was discovered on October 1, 1866, by Robert Luther. In 2000 it was found to consist of two almost-equally-sized bodies orbiting each other. At average diameters of about 88 km and 84 km, both components are among the 500 largest asteroids. Antiope is part of the Themis family.

Naming

The number in 90 Antiope's name denotes that it was the 90th asteroid to be discovered. Its proper name comes from Greek mythology, though it is disputed as to whether this is Antiope the Amazon or Antiope the mother of Amphion and Zethus.

Since the discovery of Antiope's binary nature, the name "Antiope" technically refers to the slightly larger of the two components, with the smaller component bearing the provisional designation S/2000 (90) 1. However, the name "Antiope" is also used to refer to the binary system as a whole.

Properties

The most remarkable feature of Antiope is that it consists of two components of almost equal size (the difference in mass is less than 2.5%^[8]), making it a truly "double" asteroid. Its binary nature was discovered on 10 August 2000 by a group of astronomers using adaptive optics at the Keck Telescope on Mauna Kea.^[9] Before this, IRAS observations had suggested that the asteroid was 120 km in diameter.^[1]

Orbital

Antiope orbits in the outer third of the core region of the asteroid belt, and is a member of the Themis family.

Since each component is about 86±1 km across, with their centers separated by only about 171 kilometers,^[3] the gap separating the two halves is about the same as the diameter of each component. As a result, the two bodies orbit around the common center of mass which lies in the space between them. The orbital period is approximately 16.50 hours, and the eccentricity below 0.006.^[3] Every several years, a period of mutual occultations occurs when the asteroid is viewed from Earth.^[5] Using Kepler's third law, the mass and density of the components can be derived from the orbital period and component sizes.

The axis of the mutual orbit of the two components points towards ecliptic coordinates (β, λ) = (200°, 38°)^[4] with 2 degrees uncertainty.^[4] This is tilted about 63° to the circumsolar orbit of the system.

Physical

Antiope itself has an average diameter of about 88 km, while its twin, S/2000 90 (1), has an average diameter of 84 km. Like most bodies in this region, the components of the Antiope system are of the dark C spectral type, indicating a carbonaceous composition. The low density (1.3±0.2 g/cm³) of its components (see below) suggests a significant porosity (>30%), indicating rubble-pile asteroids composed of debris that accumulated in the aftermath of a previous asteroid collision, possibly the one that formed the Themis family.^{[citation needed]}

Complementary observations using adaptive optic observations on 8–10m class telescopes and mutual events photometric lightcurve over several months have served as input quantities for a derivation of a whole set of other physical parameters (shapes of the components, surface scattering, bulk density, and internal properties). The shape model is consistent with slightly non-spherical components, having a size ratio of 0.95 (with an average radius of 42.9 km), and exhibiting equilibrium figures for homogeneous rotating bodies. A comparison with grazing occultation event lightcurves taken in 2003 suggests that the real shape of the components do not depart much from Roche equilibrium figures (by more than 10%).^{[citation needed]}

Observations from the VLT-UT4 telescope equipped with an adaptive optics system in 2007 and lightcurve data analysis suggest that one of the components appears to have a 68-km bowl-shaped impact crater that may be the result of a violent collision of proto-Antiope into two equisized bodies.^[10] The impactor is calculated to have been more than 17 km in diameter.^[11] The crater can not be resolved using the W.M. Keck II telescope, but has been confirmed by the occultation of the star LQ Aquarii on 2011 July 19 10:25UT.^[12]

One observed stellar occultation by Antiope was reported, on June 11, 1980. On 2011 July 19 10:25UT, Antiope was observed to occult a magnitude 6.7 star for up to about 30 seconds.^[13]

References

External links

• Discovery of Companions to Asteroids 762 Pulcova and 90 Antiope SWrI Press Release.
• Data on (90) Antiope from Johnston's archive (maintained by W. R. Johnston)
• online data on the Antiope system maintained by F. Marchis; includes images and simulated occultation movies.
• ESO Press-Release published on May 29, 2007 The Impossible Siblings
• UC-Berkeley Press-Release published on May 29, 2007 Binary asteroid revealed as twin rubble piles
• Antiope, a true binary asteroid, The Planetary Society weblog, E. Lakdawalla, 11 April 2007.
• 90 Antiope at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters

• An Occultation by the double asteroid (90) Antiope seen in California (Franck Marchis)
• Beatty, Kelly (September 9, 2011). "Antiope Occultation Yields Double Bonanza". Sky and Telescope. http://www.skyandtelescope.com/community/skyblog/observingblog/129541438.html. Retrieved 13 September 2011.