164207 Cardea

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164207 Cardea
2004 GU9 CFHT 2007-02-09 annotated.gif
Cardea photographed by the Canada–France–Hawaii Telescope in February 2007
Discovery [1]
Discovered by LINEAR
Discovery site Lincoln 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 arc 5424 days (14.85 yr)
Aphelion 1.1376258581  AU (170.18640603  Gm)
Perihelion 0.86490477 AU (129.387912 Gm)
1.001265315 AU (149.7871591 Gm)
Eccentricity 0.1361882
1.00 yr (365.95 d)
154.915171°
0° 59m 1.464s / day
Inclination 13.6490265°
38.6405971°
280.55672±0.00007 °
2456145.53817±0.00006 jd
280.28542°
Earth  MOID 0.000389702 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]

    Contents

    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] As later prediscovery observations by Haleakala-AMOS from 2001 could be found, Cardea now has a well determined orbit with an observation arc of 24 years (see MPC Database).

    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
    Animation of 2004 GU9's orbit relative to Sun and Earth.gif
    Relative to Sun and Earth
    Animation of 2004 GU9's orbit around Earth.gif
    Around Earth
    Animation of 2004 GU9's orbit around Sun.gif
    Around Sun
       Sun ·   Earth ·  2004 GU9

    See also

    References

    1. 1 2 "(164207) = 2004 GU9". Minor Planet Center. Retrieved 3 June 2024.
    2. 1 2 "(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.
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