164207 Cardea
Cardea photographed by the Canada–France–Hawaii Telescope in February 2007 | |
| Discovery | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 13 April 2004 |
| Designations | |
| (164207) Cardea | |
| Pronunciation | /ˈkɑːrdiə/ |
Named after | Cardea |
| 2004 GU9 | |
| NEO · Apollo | |
| Orbital characteristics | |
| Epoch 21 November 2025 (JD 2461000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 8688 days (23.79 yr) |
| Aphelion | 1.1372 AU (170.12 Gm) |
| Perihelion | 0.8650 AU (129.40 Gm) |
| 1.0011 AU (149.76 Gm) | |
| Eccentricity | 0.1359 |
| 1.0017 yr (365.87 d) | |
| 97.3298° | |
| 0° 59m 1.464s / day | |
| Inclination | 13.6529° |
| 38.3866° | |
| 280.55672±0.00007° | |
| 2456145.53817±0.00006 jd | |
| 279.3410° | |
| Earth MOID | 0.0031 AU (460,000 km) |
| Physical characteristics | |
| 163 m | |
| 0.219 | |
| 21.1 | |
164207 Cardea (provisional designation 2004 GU9) is a sub-kilometer asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group. It is a quasi-satellite of Earth, a situation that should persist until around 2600, when it is expected to shift to a regular horseshoe orbit for a few thousand years.
On 14 April 2004 (with less than a 1-day observation arc), the Sentry Risk Table showed 180 virtual impactors. It was removed from the Sentry Risk Table 2 days later on 16 April 2004. As later precovery observations by Haleakala-AMOS from 2001 have been found, Cardea now has a well determined orbit with an observation arc of 24 years.