Earth fly by of asteroid 2003 UV11 on October 30, 2010

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The about 600-meter sized asteroid 2003 UV11 comes as close as 1.93 million kilometers to the earth-moon system at its flyby on the morning of 30 Oktober 2010 at 04:14 Uhr UTC. This is roughly five times the distance from Earth to the Moon. The asteroid already is observable in the nights before the approach with adequate telescopes. Soon after the fly by, the asteroid's surface appears from the perspective of the earth only illuminated in a small part and therefore the asteroid is soon no longer visible so easy. Because the trajectory of the 2003 UV11 always is far enough from the earth, the asteroid is no danger to the Earth in year 2010.

The following ephemeris table was created with Minor Planet & Comets Ephemeris Service exactly for the position: 15.2356° East, 48.7871° North and 547m MSL. However, this table can also be used within a few thousand kilometers, because the difference caused by the parallax within this distance is not too large.

The asteroid reached in the night of October 29/30, 2010 a maximum angular velocity of nearly 3 arc seconds per second of time during the fly by. This corresponds to about 5 full moon diameters per hour. Because the asteroid achieves an apparent magnitude of about +12.2mag, it is a very suitable object for video astrometry on this fast movement. This work is not done with the usual Astro CCD cameras and with accuracy of seconds, but with sensitive video cameras and GPS time insertion in the millisecond range.

For the astrometric analysis of the video recording with time insertion the great software Tangra was written by Hristo Pavlov. With this software and videos of fast moving objects the position measurement can be done with an accuracy like usual performed on slow moving objects with Astro CCD cameras.

Video recordings of 2003 UV11

All videos were taken with the integrating video camera WAT-120N. Each video image has been provided with a time stamp. The accuracy of this time insertion is at one millisecond. The time signal was received constantly with a Garmin GPS 18x LVC from the worldwide GPS system and inserted into the video signal with a KIWI-OSD video time inserter. From the CCIR video signal individual images were recorded in the original format 768x576. These were converted later for the internet presentation in the codec format 640x480. The compression was done with 3000kbps and represents a good compromise between file size and quality.

Beside this videos here for presentation many other videos with shorter integration times were recorded too. They will be used to calculate astrometry data from the asteroid 2003 UV11.

Video from October 26, 2010 21:44 - 22:45 UTC (DivX 11.8MB)  


Videos from October 28, 2010 18:19 - 19:51 UTC (DivX 17.1MB) (Asteroid in image center)
  20:03 - 20:21 UTC (DivX 4.1MB)  
  20:25 - 20:44 UTC (DivX 4.3MB)  
  21:07 - 21:45 UTC (DivX 17.7MB) (Asteroid in image center)


Videos from October 29, 2010 20:30 - 20:37 UTC (DivX 2.6MB)  
  20:39 - 20:46 UTC (DivX 2.0MB)  
  21:26 - 21:34 UTC (DivX 2.1MB)  
  21:41 - 22:17 UTC (DivX 19.5MB) (Asteroid in image center)
  22:23 - 22:30 UTC (DivX 6.9MB)  


The setup used for recording of asteroid 2003 UV11
setup used for recording of 2003 UV11

The analog signal of the CCIR video camera WAT-120N was splited in a video amplifier in two parts. In an image signal and in a guiding signal. In the image signal the acurate GPS time signal was inserted with the KIWI-OSD before it got digitized and recorded on the notebook. The guiding signal was also digitized and used by the guiding software Guidemaster in the notebook to additionally control the mount with ASCOM. Thus it is possible with the use of only one video camera to hold a relative fast moving object in the field of view. In this way the videos with the asteroid centered in the image and a moving star background were recorded.

Ephemerides and visibility table of asteroid 2003 UV11
October 23 - November 01, 2010

2003 UV11
Period of orbit          1.75 years (638.4 days)
Perihelion distance      0.34 AU
Aphelion distance        2.56 AU
Semimajor axis a         1.4509400 AU
Exccentricity e          0.7628820
Inclination i            5.9518000 deg
Argument of perihelion 124.7952000 deg
Long. ascending node    31.9895000 deg
Mean anomaly           278.1631000 deg

The orbit position of PHA asteroid 2003 UV11 in the solar system
orbit of 2003 UV11
Diagram created with EasySky from Matthias Busch


Video animation of fly by - The earth in the view of asteroid 2003 UV11
October 23, 00:00 UTC - November 03, 23:00 UTC
(4.71 MB - MPEG4)


The apparent movement of asteroid 2003 UV11 on sky from October 25 until November 03, 2010
Path of 2003 UV11
Star map and video animation created with Guide 8 from Bill J Gray.


© 2010 G. Dangl
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November 02, 2010
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