1139 Atami

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1139 Atami [1]
Discovery and designation
Discovered by Okuro Oikawa and Kazuo Kubokawa
Discovery date 1929-Dec-01
Orbital characteristics
Epoch Orbital Elements at Epoch 2454200.5 (2007-Apr-10.0) TDB
Aphelion 2.44538167801902 AU
Perihelion 1.4506609472059 AU
Semi-major axis 1.94802131261246 AU
Eccentricity 0.25531566938534
Orbital period 993.0908555984342 days
2.72 years
Mean anomaly 172.9145575307504 °
Inclination 13.0888203094939 °
Longitude of ascending node 213.4316068527716 °
Argument of perihelion 206.4535499752972 °
Known satellites 1[2]
Physical characteristics
Dimensions ~6km[2]
Rotation period 27.44 h
Spectral type

S   (Tholen)

Absolute magnitude (H) 12.51 mag

1139 Atami is a Mars-crossing asteroid orbiting the Sun. It makes a revolution around the Sun once every 3 years. It completes one rotation once every 27 hours. It was discovered by Okuro Oikawa and Kazuo Kubokawa on December 1, 1929.[1] It is named after a harbor near Tokyo, Japan. Its provisional designation was 1929 XE.[3]

Binary system[edit]

Photometric and Arecibo echo spectra observations in 2005 confirmed a 5 km (3 mi) satellite orbiting at least 15 km (9 mi) from the primary.[2] Due to the similar size of the primary and secondary the Minor Planet Center lists this as a binary companion.[4]


  1. ^ a b "JPL Small-Body Database Browser: 1139 Atami (1929 XE)". Retrieved October 17, 2007. 
  2. ^ a b c "Electronic Telegram No. 430". IAU Central Bureau for Astronomical Telegrams. 2006-03-14. Retrieved 2011-01-25. 
  3. ^ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer. ISBN 3-540-00238-3. 
  4. ^ "Satellites and Companions of Minor Planets". IAU Central Bureau for Astronomical Telegrams. 2009-09-17. Retrieved 2011-01-25. 

External links[edit]