(9140) Deni Main-belt Asteroid
Discovered on 16 October 1977 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Named after the Department of Education for Northern Ireland for its support of the Armagh Observatory, where Ernst Opik carried out seminal work on the collisional evolution and dynamics of small bodies. The DENI has promoted lifelong learning and research across many disciplines, encompassing higher education, schools, museums, recreation and culture. It has sought for many years to advance knowledge and understanding of the natural world, and to provide the means by which as many people as possible may appreciate and continue to develop Northern Ireland's rich cultural heritage, its diversity and contributions to the scientific, intellectual and social life of the community.Naming citation (19990402/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Deni is today
Seen from above the solar system on 2026-10-14: Deni is 2.32 au from the Sun and 3.27 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9140 |
| Provisional designation | 4195 T-3 |
| Orbit class | Main-belt Asteroid |
| Rotation period | 25.3 hours |
| Absolute magnitude (H) | 14.19 |
| Orbital period | 3.63 years |
| Semi-major axis | 2.36 au |
| Perihelion – aphelion | 2.11 – 2.61 au |
| Eccentricity | 0.106 |
| Inclination | 13.9° |
| Closest distance between its orbit and Earth's (MOID) | 1.15 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 16 October 1977
- (3798) de Jager
- (3936) Elst
- (4044) Erikhog
- (4108) Rakos
- (4722) Agelaos
- (4753) Phidias
- (4754) Panthoos
- (5610) Balster
- (5699) Munch
- (5700) Homerus
- (5984) Lysippus
- (6055) Brunelleschi