2013 ET

{{Use dmy dates|date=February 2018}}

{{Infobox planet

|minorplanet = yes

|background = #FFC2E0

|name = {{mp|2013 ET}}

|symbol =

|image = Asteroid20130318-full.jpg

|image_scale =

|caption = Radar imaging of {{mp|2013 ET}}

|discovery_ref = {{cite web|title=2013 ET|url=http://www.minorplanetcenter.net/db_search/show_object?utf8=✓&object_id=2013+ET|publisher=Minor Planet Center|accessdate=21 August 2017}}

|discoverer = Catalina Sky Survey

|discovered = March 3, 2013

|discovery_site = Mount Lemmon Obs.
{{small|(first observed only)}}

|mpc_name = 2013 ET

|mp_category = NEO{{·}}Apollo

|alt_names = {{mp|2001 SY|169}}

|orbit_ref = {{cite sbdb|title=(2013 ET)|id=3629117|accessdate=21 August 2017}}

|epoch = 2020-May-31 (JD 2459000.5)

|uncertainty = 0

|observation_arc = 11 years

|aphelion = {{Convert|1.6688|AU|Gm|abbr=on|lk=on}}

|perihelion = {{Convert|0.74228|AU|Gm|abbr=on}}

|semimajor = {{Convert|1.2055|AU|Gm|abbr=on}}

|eccentricity = 0.38428

|period = 1.32 yr (483.49 d)

|avg_speed =

|inclination = 4.8515°

|asc_node = 171.30°

|mean_anomaly = 121.70°

|mean_motion = {{Deg2DMS|0.74418|sup=ms}} /day

|arg_peri = 81.937°

|satellites =

|moid = {{Convert|0.0041|AU|km|abbr=on}}

|mercury_moid = {{Convert|0.287|AU|km|abbr=on}}

|dimensions = {{cvt|100|m|ft|lk=on}}

|sidereal_day =

|albedo =

|spectral_type =

|abs_magnitude = 22.7

}}

2013 ET is a near-Earth asteroid that was first observed on March 3, 2013, six days before its closest approach to Earth. It is estimated to be around {{convert|100|m|ft|abbr=off|sp=us}} wide.{{cite web|last=Wall |first=Mike |url=http://www.space.com/20085-asteroid-buzzes-earth-this-weekend.html |title=Big Asteroid to Zoom By Earth This Weekend |work=Space.com |date=March 5, 2013}} The orbit of {{mp|2001 SY|169}} has been connected to 2013 ET extending the observation arc to 11 years.

Its closest approach to Earth was {{convert|0.0065207|AU|km mi|abbr=on|lk=on|}} on March 9, 2013 at 12:09 UT.{{cite web|last=Gray |first=Melissa |url=http://lightyears.blogs.cnn.com/2013/03/07/asteroid-to-fly-past-earth-this-weekend/?hpt=hp_t3 |archive-url=https://web.archive.org/web/20130310081750/http://lightyears.blogs.cnn.com/2013/03/07/asteroid-to-fly-past-earth-this-weekend/?hpt=hp_t3 |url-status=dead |archive-date=10 March 2013 |title=Asteroid to fly past Earth this weekend |work=Light Years |publisher=CNN |date=March 7, 2013}} The asteroid also makes close approaches to Mars and Venus. The asteroid was imaged by Goldstone radar on March 10, 2013.

2013 ET was one of four asteroids that passed in the vicinity of Earth during one week in early March 2013.{{Cite news|url=https://www.space.com/20149-asteroids-buzz-earth-week.html|title=Four Asteroids Buzz Earth in Single Week|work=Space.com|access-date=2018-11-13}} The other asteroids in this group besides 2013 ET, included 2013 EC, {{mpl|2013 EC|20}}, and {{mpl|2013 EN|20}}.