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Discovery
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| Discovered by | Okuro Oikawa |
| Discovery date | September 5, 1928 |
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Designations
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| Named after | Hakone |
| Alternate name(s) | 1928 RJ |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 449.520 Gm (3.005 AU) |
| Perihelion | 355.397 Gm (2.376 AU) |
| Semi-major axis | 402.459 Gm (2.690 AU) |
| Eccentricity | 0.117 |
| Orbital period | 1611.729 d (4.41 a) |
| Average orbital speed | 18.10 km/s |
| Mean anomaly | 221.523° |
| Inclination | 13.364° |
| Longitude of ascending node | 329.127° |
| Argument of perihelion | 81.019° |
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Physical characteristics
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| Dimensions | 24.7 km |
| Mass | 1.6×1016 kg |
| Mean density | ?/cm³ |
| Equatorial surface gravity | 0.0069 m/s² |
| Escape velocity | 0.0131 km/s |
| Rotation period | ? d |
| Albedo | ? |
| Temperature | ~170 K |
| Spectral type | ? |
| Absolute magnitude (H) | 10.2 |
1098 Hakone is a minor planet orbiting the Sun. Initially it received the designation 1928 RJ. It was named for the Japanese city of Hakone, Kanagawa.
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