| Discovery[1] | |
|---|---|
| Discovered by | C. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 1 January 1992 |
| Designations | |
| (7088) Ishtar | |
| Pronunciation | /ˈɪʃtɑːr/[2] |
Named after | Ishtar[1] (Mesopotamian goddess) |
| 1992 AA | |
| NEO · Amor[1][3] Binary[4][5] | |
| Orbital characteristics[3] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.52yr (14,071 d) |
| Aphelion | 2.7551AU |
| Perihelion | 1.2057 AU |
| 1.9804 AU | |
| Eccentricity | 0.3912 |
| 2.79 yr (1,018 d) | |
| 284.83° | |
| 0° 21m 12.96s / day | |
| Inclination | 8.3045° |
| 102.65° | |
| 354.73° | |
| Knownsatellites | 1[4][5] (P:20.65 h;D: 330 m)[4][6][7] |
| Earth MOID | 0.2230 AU (86.9LD) |
| Physical characteristics | |
| 1.298±0.261 km(primary)[8] 1.51 km(effective)[9] | |
| 2.6790±0.0002 h[6][7] | |
| 0.260±0.122[8] | |
| U[10] | |
| 16.7[1] 16.80[3][8] | |
7088 Ishtar, provisional designation1992 AA, is a synchronousbinary asteroid andnear-Earth object from theAmor group, approximately 1.3 kilometers (0.81 miles) in diameter. It was discovered on 1 January 1992, by American astronomerCarolyn Shoemaker at thePalomar Observatory in California.[1] The relatively bright asteroid with an unknownspectral type has arotation period of 2.7 hours.[10][11] In December 2005, a 330-meter sizedsatellite was discovered,orbiting its primary every 20.65 hours.[6]
Ishtar orbits the Sun at a distance of 1.2–2.8 AU once every 2 years and 9 months (1,018 days;semi-major axis of 1.98 AU). Its orbit has aneccentricity of 0.39 and aninclination of 8° with respect to theecliptic.[3] The body'sobservation arc begins with its first observation at theSiding Spring Observatory in March 1981, almost 11 years prior to its official discovery observation atPalomar.[1]
Thisminor planet was named after the ancient Mesopotamian goddessIshtar (Inanna). She is the principal goddess of the Assyrians and Babylonians associated with love, fertility, sex and war. The officialnaming citation was published by theMinor Planet Center on 22 April 1997 (M.P.C. 29671).[12]
Ishtar has an unknownspectral type (U).[10] TheCollaborative Asteroid Lightcurve Link (CALL) assumes standardS-type asteroid due to its relatively high albedo(see below).[11]
In December 2005, a rotationallightcurve ofIshtar was obtained fromphotometric observations byVishnu Reddy and collaborators. Lightcurve analysis gave arotation period of2.6790±0.0002 h hours with a brightness amplitude of 0.11magnitude (U=3).[6][7][13]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Ishtar measures 1.298 kilometers in diameter and its surface has analbedo of 0.26.[8][7] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and derives a diameter of 1.16 kilometers based on anabsolute magnitude of 17.08.[11]
