Asteroid 2009 UD is a near-Earth object catalogued by NASA under reference ID 3471586. Its estimated diameter is 10–22 m (average 16 m), inferred from brightness rather than measured directly. Its closest catalogued approach to Earth occurs on Tue, Oct 20, 2009, missing by 775,074 km — 2.02 lunar distances. NASA does not classify it as a potentially hazardous asteroid.
This score ranks how notable the asteroid approach is. It is not an impact prediction.
Closest approach
Size and brightness
Related close approaches
| Date | Orbiting | Miss (km) | Miss (LD) | Velocity (km/s) | Index |
|---|---|---|---|---|---|
| 29/03/50Wed, Mar 29, 1950 | Earth | 33,608,179 | 87.39 | 9.8 | 15 |
| 09/10/63Wed, Oct 9, 1963 | Earth | 23,593,202 | 61.35 | 8.0 | 14 |
| 23/03/65Tue, Mar 23, 1965 | Earth | 8,276,979 | 21.52 | 4.7 | 13 |
| 10/04/66Sun, Apr 10, 1966 | Earth | 72,573,139 | 188.71 | 17.4 | 19 |
| 08/10/78Sun, Oct 8, 1978 | Earth | 28,375,166 | 73.78 | 8.9 | 15 |
| 23/03/80Sun, Mar 23, 1980 | Earth | 6,797,564 | 17.68 | 4.4 | 17 |
| 10/04/81Fri, Apr 10, 1981 | Earth | 72,586,743 | 188.75 | 17.5 | 19 |
| 24/09/92Thu, Sep 24, 1992 | Earth | 71,940,484 | 187.07 | 17.4 | 19 |
| 19/10/93Tue, Oct 19, 1993 | Earth | 3,494,313 | 9.09 | 4.4 | 34 |
| 12/06/94Sun, Jun 12, 1994 | Earth | 24,711,535 | 64.26 | 3.5 | 12 |
| 30/03/95Thu, Mar 30, 1995 | Earth | 24,038,053 | 62.51 | 7.9 | 14 |
| 28/09/08Sun, Sep 28, 2008 | Earth | 62,699,193 | 163.04 | 15.6 | 18 |
| 20/10/09Tue, Oct 20, 2009 | Earth | 775,074 | 2.02 | 4.0 | 48 |
| 21/10/09Wed, Oct 21, 2009 | Moon | 1,016,133 | 2.64 | 4.5 | 47 |
| 23/06/10Wed, Jun 23, 2010 | Earth | 24,735,918 | 64.32 | 3.4 | 12 |
| 02/04/11Sat, Apr 2, 2011 | Earth | 14,407,603 | 37.46 | 6.2 | 13 |
| 18/04/12Wed, Apr 18, 2012 | Earth | 69,260,081 | 180.10 | 16.9 | 19 |
| 04/10/26Sun, Oct 4, 2026 | Earth | 47,218,840 | 122.78 | 12.7 | 17 |
| 27/10/27Wed, Oct 27, 2027 | Earth | 8,463,806 | 22.01 | 2.7 | 12 |
| 01/06/28Thu, Jun 1, 2028 | Earth | 22,729,828 | 59.10 | 3.3 | 12 |
| 04/04/29Wed, Apr 4, 2029 | Earth | 26,263,774 | 68.29 | 8.5 | 14 |
| 28/09/43Mon, Sep 28, 2043 | Earth | 64,576,117 | 167.92 | 16.1 | 18 |
| 17/10/44Mon, Oct 17, 2044 | Earth | 7,306,710 | 19.00 | 5.1 | 15 |
| 07/07/45Fri, Jul 7, 2045 | Earth | 25,352,764 | 65.92 | 3.4 | 12 |
| 31/03/46Sat, Mar 31, 2046 | Earth | 7,771,051 | 20.21 | 5.0 | 13 |
| 18/04/47Thu, Apr 18, 2047 | Earth | 64,057,934 | 166.57 | 15.9 | 18 |
| 10/10/61Mon, Oct 10, 2061 | Earth | 30,954,631 | 80.49 | 9.5 | 15 |
| 10/04/64Thu, Apr 10, 2064 | Earth | 43,078,806 | 112.02 | 11.8 | 16 |
| 29/09/78Thu, Sep 29, 2078 | Earth | 62,002,541 | 161.23 | 15.6 | 18 |
| 18/10/79Wed, Oct 18, 2079 | Earth | 5,716,593 | 14.86 | 4.8 | 23 |
| 07/07/80Sun, Jul 7, 2080 | Earth | 25,131,678 | 65.35 | 3.4 | 12 |
| 01/04/81Tue, Apr 1, 2081 | Earth | 6,858,734 | 17.83 | 4.8 | 17 |
| 18/04/82Sat, Apr 18, 2082 | Earth | 61,627,631 | 160.25 | 15.4 | 18 |
| 02/10/96Tue, Oct 2, 2096 | Earth | 55,109,725 | 143.30 | 14.2 | 17 |
| 20/10/97Sun, Oct 20, 2097 | Moon | 1,214,009 | 3.16 | 4.1 | 46 |
| 21/10/97Mon, Oct 21, 2097 | Earth | 1,439,625 | 3.74 | 3.8 | 45 |
Data source
All figures on this page come from NASA's Near Earth Object Web Service, maintained by the Center for Near-Earth Object Studies at JPL. The Orbitfall Index is calculated by Orbitfall from those values — see the methodology and the NASA asteroid tracker overview. For current passes, see asteroids passing Earth today.
Learn about close approaches
Today's catalogued close approaches, ranked.
What counts as a near-Earth object, and today's list.
What a close approach is and how it's measured.
Where the data comes from and how often it updates.
What NASA's PHA label does and doesn't mean.
1 LD = 384,400 km — the yardstick for flybys.
Why a close approach is a schedule, not a warning.
From first detection to orbit refinement.