164207 Cardea

164207 Cardea
Cardea photographed by the Canada–France–Hawaii Telescope in February 2007
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date13 April 2004
Designations
(164207) Cardea
Named after
Cardea
2004 GU9
NEO · Apollo
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc5424 days (14.85 yr)
Aphelion1.1376258581 AU (170.18640603 Gm)
Perihelion0.86490477 AU (129.387912 Gm)
1.001265315 AU (149.7871591 Gm)
Eccentricity0.1361882
1.00 yr (365.95 d)
154.915171°
0° 59m 1.464s / day
Inclination13.6490265°
38.6405971°
280.55672±0.00007°
2456145.53817±0.00006 jd
280.28542°
Earth MOID0.000389702 AU (58,298.6 km)
Physical characteristics
160–360 meters[3]
0.219
21.1[2]

164207 Cardea (provisional designation 2004 GU9) is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. It is a quasi-satellite of Earth until around 2600.[4]

On 14 April 2004 (with less than a 1-day observation arc), the Sentry Risk Table showed 180 virtual impactors.[5] It was removed from the Sentry Risk Table 2 days later on 16 April 2004.[6] Cardea now has a well determined orbit with an observation arc of 12 years.

Discovery and naming

This asteroid was discovered on 13 April 2004 by the Lincoln Near-Earth Asteroid Research project near Socorro, New Mexico and given the provisional designation 2004 GU9.[1] Following the naming of 524522 Zoozve, a quasi-satellite of Venus, Radiolab and the International Astronomical Union held a public naming campaign for this quasi-satellite from June to September 2024.[7][8] Seven finalist names were revealed in December 2024, with the names being Bakunawa, Cardea, Ehaema, Enkidu, Ótr, Tarriaksuk, and Tecciztecatl.[9] The winning name was Cardea, the Roman goddess of the hinge. The name was announced by the International Astronomical Union on 13 January 2025.[10]

Animation of (164207) 2004 GU9's orbit from 1600 to 2500
Relative to Sun and Earth
Around Earth
Around Sun
   Sun ·    Earth ·   2004 GU9

See also

References

  1. ^ a b "(164207) = 2004 GU9". Minor Planet Center. Retrieved 3 June 2024.
  2. ^ a b "(164207) 2004 GU9". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2164207. Retrieved 7 April 2016.
  3. ^ "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001.
  4. ^ Wajer, Paweł (October 2010). "Dynamical evolution of Earth's quasi-satellites: 2004 GU9 and 2006 FV35". Icarus. 209 (2): 488–493. Bibcode:2010Icar..209..488W. doi:10.1016/j.icarus.2010.05.012.
  5. ^ "Major News about Minor Objects: Risk monitoring". hohmanntransfer. 14 April 2004. Archived from the original on 6 November 2020. Retrieved 2 March 2015.
  6. ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 June 2002. Retrieved 1 March 2015.
  7. ^ "Competition Announced to Name a Quasi-Moon". IAU. 31 May 2024. Retrieved 3 June 2024.
  8. ^ "OFFICIAL RULES: Name a Quasi Moon!". Radiolab. Retrieved 3 June 2024. Radiolab is partnering with the International Astronomical Union to launch a months-long global naming contest for one of Earth's quasi-moons (asteroid 164207).
  9. ^ Wall, Mike (2 December 2024). "Strange "quasi-moon" of Earth will get one of these 7 names". Space.com. Retrieved 13 January 2025.
  10. ^ "WGSBN Bulletin Volume 5, #1" (PDF). WGSBN Bulletin. 5 (1). International Astronomical Union: 28. 13 January 2025. Retrieved 13 January 2025.