Legend - object IDs plus links to more info
Data compiled at 1528 UTC on 22 May 2013 for ten known objects during a period of seven days from 19 to 25 May 2013. Orange type highlights objects with just reported observation and new JPL orbit solution.
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Object Details - Skychart objects presented in reverse designation order, newest first
("designation assigned to" indicates unofficial discovery credit)
| 2013 KT1 - outbound | |
| Approximate diameter | 17 meters (H=26.517) |
| Closest Earth approach | 3.19 LD at 1425 UT on 21 May 2013 |
| Inside Earth's Hill sphere | 19 to 23 May 2013 |
| Inside ten LD of Earth | 14 to 28 May 2013 |
| Data based on | JPL SSD orbit solution #3 downloaded from JPL on 21 May 2013 UTC based on 82 observations spanning 2 days |
| Optical observation |
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| Links |
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| 2013 KS1 - passing | |
| Approximate diameter | 15 meters (H=26.813) |
| Closest Earth approach | 4.80 LD at 1139 UT on 22 May 2013 |
| Inside ten LD of Earth | 18 to 26 May 2013 |
| Data based on | JPL SSD orbit solution #2 downloaded from JPL on 22 May 2013 UTC based on 24 observations spanning 4 days |
| Optical observation |
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| Links |
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| 2013 KQ1 - outbound | |
| Approximate diameter | 15 meters (H=26.829) |
| Closest Earth approach | 6.57 LD at 2316 UT on 16 May 2013 |
| Inside ten LD of Earth | 10 to 22 May 2013 |
| Data based on | JPL SSD orbit solution #2 downloaded from JPL on 20 May 2013 UTC based on 25 observations spanning 3 days |
| Optical observation |
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| Links |
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| 2013 KB - passing | |
| Approximate diameter | 12 meters (H=27.174) |
| Closest Earth approach | 3.16 LD at 0605 UT on 22 May 2013 - Note: JPL reports an approach uncertainty of +/- 15 minutes |
| Inside Earth's Hill sphere | 20 to 23 May 2013 |
| Inside ten LD of Earth | 15 to 28 May 2013 |
| Data based on | JPL SSD orbit solution #1 downloaded from JPL on 18 May 2013 UTC based on 15 observations spanning one day |
| Optical observation |
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| Links |
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| 2013 KA - outbound | |
| Approximate diameter | 8 meters (H=28.209) |
| Closest Earth approach | 2.06 LD at 1238 UT on 17 May 2013 |
| Inside Earth's Hill sphere | 14 to 20 May 2013 |
| Inside ten LD of Earth | 8 to 26 May 2013 |
| Closest Moon approach | 1.89 LD at 0050 UT on 17 May 2013 |
| Data based on | JPL SSD orbit solution #1 downloaded from JPL on 18 May 2013 UTC based on 19 observations spanning one day |
| Optical observation |
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| Links |
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| 2013 JD34 - departed | |
| Approximate diameter | 33 meters (H=25.052) |
| Closest Earth approach | 2.31 LD at 0334 UT on 7 May 2013 - Note: JPL reports an approach uncertainty of +/- 10 minutes |
| Inside Earth's Hill sphere | 6 to 7 May 2013 |
| Inside ten LD of Earth | 5 to 9 May 2013 |
| Data based on | JPL SSD orbit solution #2 downloaded from JPL on 22 May 2013 UTC based on 19 observations spanning 6 days |
| Optical observation |
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| Notes | risk |
| Links |
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| 2013 JM22 - departed | |
| Approximate diameter | 77 meters (H=23.23) |
| Closest Earth approach | 7.89 LD at 1411 UT on 16 May 2013 |
| Inside ten LD of Earth | 15 to 17 May 2013 |
| Data based on | JPL SSD orbit solution #12 downloaded from JPL on 21 May 2013 UTC based on 69 observations spanning 4 days |
| Optical observation |
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| Links |
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| 2013 JV17 - departed | |
| Approximate diameter | 9 meters (H=27.826) |
| Closest Earth approach | 4.10 LD at 1115 UT on 6 May 2013 - Note: JPL reports an approach uncertainty of +/- 2 minutes |
| Inside ten LD of Earth | 1 to 11 May 2013 |
| Data based on | JPL SSD orbit solution #1 downloaded from JPL on 12 May 2013 UTC based on 9 observations spanning one day |
| Optical observation |
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| Links |
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| 2013 JF1 - departed | |
| Approximate diameter | 35 meters (H=24.911) |
| Closest Earth approach | 9.91 LD at 0822 UT on 29 April 2013 |
| Inside ten LD of Earth | 28 to 30 April 2013 |
| Data based on | JPL SSD orbit solution #14 downloaded from JPL on 22 May 2013 UTC based on 131 observations spanning 17 days |
| Optical observation |
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| Links |
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| 2009 FE - approaching | |
| Approximate diameter | 184 meters (H=21.323) |
| Closest Earth approach | 9.60 LD at 0505 UT on 4 June 2013 |
| Inside ten LD of Earth | 2 to 5 June 2013 |
| Data based on | JPL SSD orbit solution #18 downloaded from JPL on 21 May 2013 UTC based on 104 observations spanning 2009-2013 |
| Optical observation |
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| Links |
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Footnotes
1. Ten lunar distances: A "lunar distance" (LD) is the average distance between Earth and Moon (about 384,400 km., the same as 238,855 miles or nearly ten [9.59] times around Earth's equator). Ten lunar distances has no special astronomical importance but is a useful arbitrary "bubble" within which to organize this reporting. An approach by a small Solar-System body starts to become interesting at less than four LD out from Earth as it encounters our planet's "Hill sphere" (distance indicated by the blue line in this illustration at about 3.9 LD). This is a region within which Earth's gravitational influence can change the orbits of passing objects. The Moon also has a Hill sphere, outlined here as a gray circle. (Earth and Moon are not shown to scale.) The "Earth-Moon system" is generally defined as that region of space within a radius of one lunar distance from Earth, so an object can pass very close to the Moon yet not be described as coming "inside" the E-M system.
2. Data credit: All data on this page derived from orbit solutions comes from the NASA JPL Solar System Dynamics (SSD) Group through its Horizons system. All information about optical observations comes from the IAU Minor Planet Center (MPC) and info about radar observations comes from JPL SSD. The MPC, NASA, and JPL are not associated with this page or A/CC, and responsibility for the interpretation of this information and its use here rests entirely with A/CC. Important note: Approach times presented here as to-the-minute may have unstated uncertainties of a few minutes, or many minutes or even hours for objects with old or very short observation spans, which is significant because the Earth moves through its own diameter in about seven minutes. Thus actual encounter distances may vary, occasionally by as much as ten lunar distances. See JPL's Close Approach Tables for nominal vs. minimum possible passage distances and times and for their note about uncertainties.
3. Size estimates: Object diameters are rough approximations derived by standard formula from H, an object's "absolute magnitude" (brightness), where higher numbers represent dimmer (thus usually smaller) objects.