2007 TU24: Difference between revisions

2007 TU₂₄
	Radar image of 2007 TU24
Discovery
Discovered by	Catalina Sky Survey
Discovery date	11 October 2007
Designations
Minor planet category	Apollo; NEO; PHA;
Orbital characteristics
	Epoch 13 January 2016 (JD 2457400.5)
	Uncertainty parameter 0
Observation arc	1093 days (2.99 yr)
Aphelion	3.1343 AU (468.88 Gm)
Perihelion	0.95153 AU (142.347 Gm)
Semi-major axis	2.0429 AU (305.61 Gm)
Eccentricity	0.53423
Orbital period (sidereal)	2.92 yr (1066.5 d)
Mean anomaly	267.95°
Mean motion	0° 20m 15.144s / day
Inclination	5.6232°
Longitude of ascending node	127.041°
Argument of perihelion	334.254°
Earth MOID	0.000483062 AU (72,265.0 km)
Jupiter MOID	2.06887 AU (309.499 Gm)
Physical characteristics
Dimensions	~250 meters
Mass	< 2.4×1010 kg
Mean density	unknown
Equatorial surface gravity	unknown
Equatorial escape velocity	< 0.58 km/h
Synodic rotation period	26 h (1.1 d)
Geometric albedo	0.24
Absolute magnitude (H)	20.2; 20.3;

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2007 TU₂₄ is an Apollo near-Earth asteroid that was discovered by the Catalina Sky Survey in Arizona on 11 October 2007. Imaging radar has estimated that it is 250 meters (820 ft) in diameter.^[3] The asteroid passed 554,209 kilometer (344,370 mile or 1.4-lunar distance)^[5] from Earth on 29 January 2008 at 08:33 UTC. (At the time of the passage it was believed the closest for any known potentially hazardous asteroid (PHA) of this size before 2027,^[6] but in 2010 2005 YU55 was measured to be 400 meters in diameter.) At closest approach 2007 TU24 had an apparent magnitude of 10.3 and was about 50 times fainter than the naked eye can see. It required about a 3-inch (76 mm) telescope to be seen.^[3]

Impact risk assessment

From the date of discovery of asteroid 2007 TU₂₄ on 11 October 2007, a total of 316 observations of it had been made by 31 January 2008, spanning 112 days.^[1] Now the asteroid has an observation arc of about 3 years and the trajectory is well defined.^[1] It was removed from the Sentry Risk Table on 4 December 2007 at 14:05 UTC.^[7]

2008 passage

Goldstone Observatory carried out radar observations on January 23 and 24 January 2008. As of then, the orbit of the asteroid was known with such a high precision that scientists were able to calculate close approaches from the year 67 AD to 2141 AD.^[8] On 29 January 2008 at 08:33 UTC, 2007 TU₂₄ passed by the earth at a nominal distance of 0.0037043 AU (554,160 km; 344,340 mi) with a relative speed of 9.248 km/s.^[2]

Observations from Arecibo Observatory were taken on 1–4 February.^[3] It is a contact binary asteroid.^[9]

Other close approaches

Asteroid 2004 XP14 was the closest potentially hazardous asteroid, passing Earth by 432,308 km (268,624 mi), 0.00289 AU, or just 1.1 times the Moon's average distance from Earth on 3 July 2006.
Asteroid 4179 Toutatis (4.5 km diameter) came within 1.5 million km, 0.0104 AU (within 4 lunar distances) of the Earth on 29 September 2004.
On 7 August 2027, (137108) 1999 AN10 will pass within 388,960 km (0.0026 AU) of Earth
On 13 April 2029, Apophis will pass the earth within the orbits of the geosynchronous communication satellites.

References

^ ^a ^b ^c ^d JPL Small-Body Database Browser: 2007TU24
^ ^a ^b ^c ^d "JPL Close-Approach Data: (2007 TU24)" (2010-10-08 last obs (arc=2.99 years)). Retrieved 30 March 2016.
^ ^a ^b ^c ^d "NASA Scientists Get First Images of Earth Flyby Asteroid". NASA/JPL. 25 January 2008. Archived from the original on 29 January 2008. Retrieved 26 January 2008.^{[dead link‍]}
^ ^a ^b radius of 0.125 km; volume of a sphere * maximum likely density of 3 g/cm³ (though it could be a loose rubble pile) yields an improbable mass of 2.45×10¹⁰ kg and an improbable escape velocity of 0.58 km/h.
^ "Asteroid Zooms by Earth". NASA/JPL. 29 January 2008. Archived from the original on 2 February 2008. Retrieved 30 January 2008.
^ Near-Earth Asteroid 2007 TU24 to Pass Close to Earth on Jan. 29 - Should be Observable with Modest Sized Telescopes Archived 2008-01-24 at the Wayback Machine
^ NEOs Removed from Impact Risks Tables
^ 2007 TU24planning.html Archived 2008-01-20 at the Wayback Machine
^ Lance A. M. Benner (18 November 2013). "Binary and Ternary near-Earth Asteroids detected by radar". NASA/JPL Asteroid Radar Research. Archived from the original on 8 June 2004. Retrieved 1 March 2014.

External links

Asteroid to Make Rare Close Flyby of Earth Archived 16 March 2012 at the Wayback Machine (Catalina Sky Survey Photo)
Huge asteroid to fly by past earth.Independent Online
Asteroid 2007 TU24: No Danger to Earth Archived 31 October 2011 at the Wayback Machine (Phil Plait 25 January 2008)
2007 TU24 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
2007 TU24 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
2007 TU24 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[phys-1] JPL Small-Body Database Browser: 2007TU24

[jpl-close-2] "JPL Close-Approach Data: (2007 TU24)" (2010-10-08 last obs (arc=2.99 years)). Retrieved 30 March 2016.

[NASA0125-3] "NASA Scientists Get First Images of Earth Flyby Asteroid". NASA/JPL. 25 January 2008. Archived from the original on 29 January 2008. Retrieved 26 January 2008.^{[dead link‍]}

[max-4] radius of 0.125 km; volume of a sphere * maximum likely density of 3 g/cm³ (though it could be a loose rubble pile) yields an improbable mass of 2.45×10¹⁰ kg and an improbable escape velocity of 0.58 km/h.

[NASA0129-5] "Asteroid Zooms by Earth". NASA/JPL. 29 January 2008. Archived from the original on 2 February 2008. Retrieved 30 January 2008.

[6] Near-Earth Asteroid 2007 TU24 to Pass Close to Earth on Jan. 29 - Should be Observable with Modest Sized Telescopes Archived 2008-01-24 at the Wayback Machine

[7] NEOs Removed from Impact Risks Tables

[planning-8] 2007 TU24planning.html Archived 2008-01-20 at the Wayback Machine

[Binary-9] Lance A. M. Benner (18 November 2013). "Binary and Ternary near-Earth Asteroids detected by radar". NASA/JPL Asteroid Radar Research. Archived from the original on 8 June 2004. Retrieved 1 March 2014.

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[3]

[4]

[5]

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[9]

@@ Line 22: / Line 22: @@
  | arg_peri=334.254°
  | mean_anomaly=267.95[[Degree (angle)|°]]
- | dimensions=~250 meters<ref name="NASA0125">{{cite web |title=NASA Scientists Get First Images of Earth Flyby Asteroid |publisher=[[NASA]]/[[Jet Propulsion Laboratory|JPL]] |date=2008-01-25 |url=http://www.jpl.nasa.gov/news/news.cfm?release=2008-014 |accessdate=2008-01-26| archiveurl= https://web.archive.org/web/20080129062350/http://www.jpl.nasa.gov/news/news.cfm?release=2008-014| archivedate= 29 January 2008 <!--DASHBot-->| url-status=live}}</ref>
+ | dimensions=~250 meters<ref name="NASA0125">{{cite web |title=NASA Scientists Get First Images of Earth Flyby Asteroid |publisher=[[NASA]]/[[Jet Propulsion Laboratory|JPL]] |date=2008-01-25 |url=http://www.jpl.nasa.gov/news/news.cfm?release=2008-014 |access-date=2008-01-26| archive-url= https://web.archive.org/web/20080129062350/http://www.jpl.nasa.gov/news/news.cfm?release=2008-014| archive-date= 29 January 2008 <!--DASHBot-->| url-status=live}}{{Dead link|date=April 2024}}</ref>
  | mass=< {{Val|2.4e10|u=kg}}<ref name="max"/>
  | density=unknown
@@ Line 36: / Line 36: @@
  | mean_temp_1=unknown
  | image= 2007 TU24 radar image 20080128.jpg
-| image_size = 240
+| image_scale =
  | caption=Radar image of {{mp|2007 TU|24}}
  | mean_motion={{Deg2DMS|0.33754|sup=ms}} / day
@@ Line 46: / Line 46: @@
 }}
-'''{{mp|2007 TU|24}}''' is an [[Apollo asteroid|Apollo]] [[near-Earth asteroid]] that was discovered by the [[Catalina Sky Survey]] in [[Arizona]] on 11 October 2007. [[Imaging radar]] has estimated that it is {{convert|250|m|ft|0|sp=us}} in diameter.<ref name="NASA0125"/> The asteroid passed 554,209&nbsp;kilometer (344,370&nbsp;mile or 1.4-[[Lunar distance (astronomy)|lunar distance]])<ref name="NASA0129">{{cite web |title=Asteroid Zooms by Earth |publisher=[[NASA]]/[[Jet Propulsion Laboratory|JPL]] |date=2008-01-29 |url=http://www.jpl.nasa.gov/news/news.cfm?release=2008-014a |accessdate=2008-01-30}}</ref> from Earth on 29 January 2008 at 08:33 [[UTC]]. (At the time of the passage it was believed the closest for any known [[potentially hazardous asteroid]] (PHA) of this size before 2027,<ref>[http://neo.jpl.nasa.gov/news/news157.html Near-Earth Asteroid 2007 TU24 to Pass Close to Earth on Jan. 29 - Should be Observable with Modest Sized Telescopes] {{webarchive|url=https://web.archive.org/web/20080124150947/http://neo.jpl.nasa.gov/news/news157.html |date=2008-01-24 }}</ref> but in 2010 {{mpl|2005 YU|55}} was measured to be 400 meters in diameter.) At closest approach the asteroid had an [[apparent magnitude]] of 10.3 and was about 50 times fainter than the [[naked eye]] can see.  It required about a {{convert|3|in|mm|adj=on}} telescope to be seen.<ref name="NASA0125"/>
+'''{{mp|2007 TU|24}}''' is an [[Apollo asteroid|Apollo]] [[near-Earth asteroid]] that was discovered by the [[Catalina Sky Survey]] in [[Arizona]] on 11 October 2007. [[Imaging radar]] has estimated that it is {{convert|250|m|ft|0|sp=us}} in diameter.<ref name="NASA0125"/> The asteroid passed 554,209&nbsp;kilometer (344,370&nbsp;mile or 1.4-[[Lunar distance (astronomy)|lunar distance]])<ref name="NASA0129">{{cite web |title=Asteroid Zooms by Earth |publisher=[[NASA]]/[[Jet Propulsion Laboratory|JPL]] |date=2008-01-29 |url=http://www.jpl.nasa.gov/news/news.cfm?release=2008-014a |access-date=2008-01-30 |archive-date=2 February 2008 |archive-url=https://web.archive.org/web/20080202033417/http://www.jpl.nasa.gov/news/news.cfm?release=2008-014a |url-status=dead }}</ref> from Earth on 29 January 2008 at 08:33 [[UTC]]. (At the time of the passage it was believed the closest for any known [[potentially hazardous asteroid]] (PHA) of this size before 2027,<ref>[http://neo.jpl.nasa.gov/news/news157.html Near-Earth Asteroid 2007 TU24 to Pass Close to Earth on Jan. 29 - Should be Observable with Modest Sized Telescopes] {{webarchive|url=https://web.archive.org/web/20080124150947/http://neo.jpl.nasa.gov/news/news157.html |date=2008-01-24 }}</ref> but in 2010 {{mpl|2005 YU|55}} was measured to be 400 meters in diameter.) At closest approach 2007 TU24 had an [[apparent magnitude]] of 10.3 and was about 50 times fainter than the [[naked eye]] can see.  It required about a {{convert|3|in|mm|adj=on}} telescope to be seen.<ref name="NASA0125"/>
 ==Impact risk assessment==
@@ Line 58: / Line 58: @@
   |title=JPL Close-Approach Data: (2007 TU24)
   |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007TU24;cad=1#cad
-  |accessdate=30 March 2016}}</ref>
+  |access-date=30 March 2016}}</ref>
 Observations from [[Arecibo Observatory]] were taken on 1–4 February.<ref name="NASA0125"/> It is a [[Contact binary (asteroid)|contact binary asteroid]].<ref name="Binary">{{cite web
@@ Line 64: / Line 64: @@
   |title=Binary and Ternary near-Earth Asteroids detected by radar
   |publisher=NASA/JPL Asteroid Radar Research
-  |author=Dr. [http://science.jpl.nasa.gov/people/Benner/ Lance A. M. Benner]
+  |author=Lance A. M. Benner
   |url=http://echo.jpl.nasa.gov/~lance/binary.neas.html
   |archive-url=https://web.archive.org/web/20040608071121/http://echo.jpl.nasa.gov/~lance/binary.neas.html
-  |url-status=dead
   |archive-date=2004-06-08
-  |accessdate=2014-03-01}}</ref>
+  |access-date=2014-03-01}}</ref>
 [[Image:Asteroid TU24 20080131.gif|thumb|none|Animation of two photos taken from Slooh Teide observatory on 31 January 2008]]
@@ Line 80: / Line 79: @@
 ==See also==
-*[[List of notable asteroids]]
+*[[List of exceptional asteroids]]
-*[[Asteroid deflection strategies]]
+*[[Asteroid impact avoidance]]
-*[[Provisional designation|Asteroid naming conventions]]
+*[[Provisional designation in astronomy|Asteroid naming conventions]]
 *[[Radar astronomy]]
@@ Line 89: / Line 88: @@
 == External links ==
-* [http://www.jpl.nasa.gov/news/news.cfm?release=2008-012 Asteroid to Make Rare Close Flyby of Earth] (Catalina Sky Survey Photo)
+* [http://www.jpl.nasa.gov/news/news.cfm?release=2008-012 Asteroid to Make Rare Close Flyby of Earth] {{Webarchive|url=https://web.archive.org/web/20120316084222/http://www.jpl.nasa.gov/news/news.cfm?release=2008-012 |date=16 March 2012 }} (Catalina Sky Survey Photo)
 * [http://www.int.iol.co.za/index.php?set_id=1&click_id=118&art_id=vn20080124063319844C968336 Huge asteroid to fly by past earth.Independent Online]
-* [http://blogs.discovermagazine.com/badastronomy/2008/01/25/asteroid-2007-tu24-no-danger-to-earth/ Asteroid 2007 TU24: No Danger to Earth] ([[Phil Plait]] 25 January 2008)
+* [http://blogs.discovermagazine.com/badastronomy/2008/01/25/asteroid-2007-tu24-no-danger-to-earth/ Asteroid 2007 TU24: No Danger to Earth] {{Webarchive|url=https://web.archive.org/web/20111031131907/http://blogs.discovermagazine.com/badastronomy/2008/01/25/asteroid-2007-tu24-no-danger-to-earth/ |date=31 October 2011 }} ([[Phil Plait]] 25 January 2008)
 * {{NeoDys|2007TU24}}
 * {{ESA-SSA|2007TU24}}
@@ Line 99: / Line 98: @@
 <!--use upon numbering: {{Minor planets navigator | |number=? |PageName={{mp|(?) 2007 TU|24}} | }} -->
 {{Small Solar System bodies}}
+{{Authority control}}
 {{DEFAULTSORT:2007 TU24}}

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