164207 Cardea
{{Short description|Sub-kilometer asteroid and quasi-satellite of Earth}}
{{Use dmy dates|date=September 2020}}
{{Infobox planet
|minorplanet = yes
|name = 164207 Cardea
|background = #FFC2E0
|image = 2004 GU9 CFHT 2007-02-09 annotated.gif
|caption = Cardea photographed by the Canada–France–Hawaii Telescope in February 2007
|discoverer = LINEAR
|discovery_site = Lincoln Lab's ETS
|discovered = 13 April 2004
|discovery_method =
|mpc_name = (164207) Cardea
|named_after = Cardea
|alt_names = {{mp|2004 GU|9}}
|orbit_ref = {{Cite SBDB|title=(164207) 2004 GU9|id=2164207|access-date=7 April 2016}}
|epoch = 13 January 2016 (JD 2457400.5)
|observation_arc = 5424 days (14.85 yr)
|uncertainty = 0
|aphelion = {{Convert|1.1376258581|AU|Gm|abbr=on|lk=on}}
|perihelion = {{Convert|0.86490477|AU|Gm|abbr=on}}
|semimajor = {{Convert|1.001265315|AU|Gm|abbr=on}}
|eccentricity = 0.1361882
|mean_motion = {{Deg2DMS|0.98373997|sup=ms}} / day
|mean_anomaly = 154.915171°
|inclination = 13.6490265°
|asc_node = 38.6405971°
|long_periastron = {{val|280.55672|0.00007}}°
|time_periastron = {{val|2456145.53817|0.00006}} jd
|arg_peri = 280.28542°
|moid = {{Convert|0.000389702|AU|km|abbr=on}}
|satellites =
|mean_diameter = 160–360 meters{{cite web
|title=Absolute Magnitude (H)
|publisher=NASA/JPL
|url=http://neo.jpl.nasa.gov/glossary/h.html|archive-url=https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html|url-status=dead|archive-date=2001-03-02}}
|sidereal_day =
|albedo = 0.219
|spectral_type =
|magnitude =
}}
164207 Cardea (provisional designation {{mp|2004 GU|9}}) 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.
On 14 April 2004 (with less than a 1-day observation arc), the Sentry Risk Table showed 180 virtual impactors.{{cite web |date=2004-04-14 |title=Major News about Minor Objects: Risk monitoring |publisher=hohmanntransfer |url=http://www.hohmanntransfer.com/mn/0404/14.htm#risks |access-date=2 March 2015 |archive-date=6 November 2020 |archive-url=https://web.archive.org/web/20201106091029/http://www.hohmanntransfer.com/mn/0404/14.htm#risks |url-status=dead }} It was removed from the Sentry Risk Table 2 days later on 16 April 2004.{{cite web
|title=Date/Time Removed
|publisher=NASA/JPL Near-Earth Object Program Office
|url=http://neo.jpl.nasa.gov/risk/removed.html
|archive-url=https://web.archive.org/web/20020602101400/http://neo.jpl.nasa.gov/risk/removed.html
|url-status=dead
|archive-date=2002-06-02
|access-date=2015-03-01}} 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 {{mp|2004 GU|9}}. 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. Seven finalist names were revealed in December 2024, with the names being Bakunawa, Cardea, Ehaema, Enkidu, Ótr, Tarriaksuk, and Tecciztecatl. The winning name was Cardea, the Roman goddess of the hinge. The name was announced by the International Astronomical Union on 13 January 2025.
{{multiple image | align = left| direction = horizontal | width = 300
| header = Animation of (164207) 2004 GU9's orbit from 1600 to 2500
| image1 = Animation of 2004 GU9's orbit relative to Sun and Earth.gif
| caption1 = Relative to Sun and Earth
| image2 = Animation of 2004 GU9's orbit around Earth.gif
| caption2 = Around Earth
| image3 = Animation of 2004 GU9's orbit around Sun.gif
| caption3 = Around Sun
| footer ={{legend2| Yellow| Sun}}{{·}}{{legend2| RoyalBlue| Earth}}{{·}}{{legend2|Magenta|2004 GU9}}
}}
{{clear}}
See also
- {{mpl|(277810) 2006 FV|35}}
References
{{reflist|refs=
|title = WGSBN Bulletin Volume 5, #1
|url = https://www.wgsbn-iau.org/files/Bulletins/V005/WGSBNBull_V005_001.pdf
|journal = WGSBN Bulletin
|publisher = International Astronomical Union
|volume = 5
|issue = 1
|pages = 28
|date = 13 January 2025
|accessdate = 13 January 2025}}
|title = (164207) = 2004 GU9
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=164207
|publisher = Minor Planet Center
|accessdate = 3 June 2024}}
{{cite journal |last1=Wajer |first1=Paweł |date=October 2010 |title=Dynamical evolution of Earth’s quasi-satellites: 2004 GU9 and 2006 FV35 |journal=Icarus |volume=209 |issue=2 |pages=488-493 |doi=10.1016/j.icarus.2010.05.012 |bibcode=2010Icar..209..488W}}
{{cite web |url=https://iau.org/news/pressreleases/detail/iau2406/ |title=Competition Announced to Name a Quasi-Moon |date=31 May 2024 |publisher=IAU |access-date=3 June 2024}}
{{cite web |url=https://radiolab.org/moon-official-rules/ |title=OFFICIAL RULES: Name a Quasi Moon! |publisher=Radiolab |access-date=3 June 2024 |quote=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).}}
}}
External links
- [http://adsabs.harvard.edu/abs/2010Icar..209..488W Dynamical evolution of Earth’s quasi-satellites: 2004 GU9 and 2006 FV35] by Wajer, P. 2010, Icarus, Volume 209, Issue 2, pp. 488–493.
- {{NeoDys|164207}}
- {{ESA-SSA|164207|2004GU9}}
- {{JPL small body|id=164207}}
{{Minor planets navigator| |number=164207 |PageName=164207 Cardea | }}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:2004 GU9}}