694 Ekard
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A three-dimensional model of 694 Ekard based on its light curve.
|
|
| Discovery | |
|---|---|
| Discovered by | Joel Hastings Metcalf |
| Discovery site | Taunton, Massachusetts |
| Discovery date | November 7, 1909 |
| Designations | |
| 1909 JA | |
| Orbital characteristics[1] | |
| Epoch August 18, 2005 (JDCT 2453600.5) | |
| Aphelion | 3.536 AU |
| Perihelion | 1.803 AU |
| 2.670 AU | |
| Eccentricity | 0.325 |
| 4.362 a | |
| 17.503° | |
| Inclination | 15.842° |
| 230.429° | |
| 110.962° | |
| Physical characteristics | |
| Dimensions | 90.780[2] km |
| 5.925[3] | |
| Albedo | 0.046[2] |
| 9.17[2] | |
694 Ekard is a minor planet orbiting the Sun that was discovered by American astronomer Joel Hastings Metcalf on November 7, 1909.
Photometric observations of this asteroid gave a light curve with a period of 5.925 hours and a brightness variation of 0.50 in magnitude.[3] Measurements of the thermal inertia of 694 Ekard give a value of around 100–140 J m−2 K−1 s−1/2, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere.[2]
13-cm radar observations of this asteroid from the Arecibo Observatory between 1980 and 1985 were used to produce a diameter estimate of 101 km.[4]
References
External links
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