Discovered by Joel Hastings Metcalf Alternative names 1909 JA Aphelion 3.5372 AU (529.16 Gm) Discovered 7 November 1909 Orbits Sun Discovery site Taunton observatory | Discovery date 7 November 1909 Observation arc 106.44 yr (38878 d) Perihelion 1.8114 AU (270.98 Gm) Inclination 15.849° Discoverer Joel Hastings Metcalf Asteroid group Asteroid belt | |
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Similar 230 Athamantis, 695 Bella, 528 Rezia, 167 Urda, 306 Unitas | ||
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. 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.
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.
References
694 Ekard Wikipedia(Text) CC BY-SA