1139 Atami
| Discovery | |
|---|---|
| Discovered by | O. Oikawa K. Kubokawa |
| Discovery site | Tokyo Astronomical Obs. (389) |
| Discovery date | 1 December 1929 |
| Designations | |
| (1139) Atami | |
| Pronunciation | Japanese: [atami] |
Named after | Atami (Japanese city) |
| 1929 XE | |
| Mars-crosser | |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.50 yr (31,960 days) |
| Aphelion | 2.4451 AU |
| Perihelion | 1.4505 AU |
| 1.9478 AU | |
| Eccentricity | 0.2553 |
| 2.72 yr (993 days) | |
| 110.80° | |
| 0° 21m 45.36s / day | |
| Inclination | 13.087° |
| 213.35° | |
| 206.62° | |
| Known satellites | 1 |
| Earth MOID | 0.4722 AU · 184 LD |
| Mars MOID | 0.0298 AU |
| Physical characteristics | |
| Dimensions | 8.24±0.82 km 9.35 km (calculated) |
| 15 h 20 h 24 h 27.43±0.05 27.446±0.001 h 27.45±0.01 h 27.45±0.05 h 27.472±0.002 h 27.56±0.01 h | |
| 0.20 (assumed) 0.258±0.052 | |
| S (Tholen) · S (SMASS) S B–V = 0.920 U–B = 0.497 | |
| 12.51 · 12.59±0.37 · 12.86±0.02 | |
1139 Atami, provisional designation 1929 XE, is a stony asteroid and sizable Mars-crosser, as well as a synchronous binary system near the innermost region of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 1 December 1929, by Japanese astronomers Okuro Oikawa and Kazuo Kubokawa at the Tokyo Astronomical Observatory (389) near Tokyo. It was named after the Japanese city of Atami. It has the lowest Minimum orbit intersection distance (MOID) to Mars of any asteroid as large as it, its orbit intersecting only 0.03 astronomical units from the planet.