Seite in DeutschNear Earth fly by of asteroid 2005 YU55 on November 08, 2011
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The asteroid 2005 YU55 was discovered on December 28, 2005 by Spacewatch. The about 400-meter sized asteroid 2005 YU55 comes as close as 330.000 kilometers to the earth at its fly by on the evening of November 08, 2011 at 23:30 UT. This is roughly 85 percent of the distance from Earth to the Moon. The asteroid is not observable in the nights before the approach because he comes from the direction of the sun to the Earth. But soon after the fly by, the asteroid's surface appears from the perspective of the earth good illuminated and therefore the asteroid is easy visible for several days after the close encounter on November 08. Because the trajectory of 2005 YU55 always is far enough from the Earth and the Moon, the asteroid is no danger to the Earth in the year 2011. And he will surely not come as close as 2011 to the Earth for about the next 200 years.
The following ephemeris table was created with Minor Planet & Comets Ephemeris Service exactly for the position of MPC station C47 - Nonndorf at: 15.2356° East, 48.7871° North and 547m MSL. However, this table can also be used within a few hundred kilometers, because the difference caused by the parallax within this distance is not too large.
The asteroid is moving in the night of November 08/09, 2011 with a maximum angular velocity of nearly 8.3 arc seconds per one second of time during the fly by. This corresponds to about 17 full moon diameters per hour. Because the asteroid achieves an apparent magnitude of about +12mag, 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.
Link to the page with real images and a video sequence of 2005 YU55 from Earth fly by in April, 2010
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Video animation of the November 2011 fly by The Earth in the view of asteroid 2005 YU55 November 07 - 11, 2011 (Size 640x480, 4.9 MB - MPEG4) |
Video animation created with Guide 8 from Bill J Gray.
Video sequence from 174 real CCD images on November 12, 2011 (WMV 8.5MB)
CCD image on November 12, 2011 at 22:05:22 UTC
Atik 314L+, 30s, FL=1200mm, f4.72, 1.11arcsec/pixel
Astrometry 2005 YU55 (2011/11/12)
Atik 314L+, 30s, FL=1200mm, f4.72, 1.11arcsec/pixel
COD C47
CON G. Dangl, Nonndorf 12, 3830, Austria [gerhard@dangl.at]
OBS G. Dangl
MEA G. Dangl
TEL 0.25-m f/4.8 reflector + CCD
ACK MPCReport file updated 2011.11.17 14:06:36
AC2 gerhard@dangl.at
NET UCAC-3
K05Y55U C2011 11 12.84485 02 21 56.71 +16 57 52.2 14.7 V C47
K05Y55U C2011 11 12.85744 02 21 59.04 +16 57 46.4 14.8 V C47
K05Y55U C2011 11 12.87410 02 22 02.05 +16 57 38.2 14.7 V C47
K05Y55U C2011 11 12.88853 02 22 04.61 +16 57 30.7 14.7 V C47
K05Y55U C2011 11 12.89556 02 22 05.84 +16 57 27.0 14.8 V C47
K05Y55U C2011 11 12.91335 02 22 08.94 +16 57 17.0 14.8 V C47
K05Y55U C2011 11 12.92039 02 22 10.16 +16 57 12.9 14.7 V C47
K05Y55U C2011 11 14.84279 02 27 45.44 +16 44 33.3 15.6 V C47
K05Y55U C2011 11 14.84612 02 27 45.64 +16 44 32.8 15.5 V C47
K05Y55U C2011 11 14.84939 02 27 45.87 +16 44 32.2 15.7 V C47
K05Y55U C2011 11 14.85728 02 27 46.39 +16 44 30.8 15.7 V C47
----- end -----
Astrometrie durchgeführt mit Astrometrica von Herbert Raab.
Video sequence from 40 real CCD images on November 14, 2011 (WMV 1.88MB)
CCD image on November 14, 2011 at 20:34:29 UTC
Atik 314L+, 60s, FL=1200mm, f4.72, 1.11arcsec/pixel
Astrometry 2005 YU55 (2011/11/14)
Atik 314L+, 60s, FL=1200mm, f4.72, 1.11arcsec/pixel
COD C47
CON G. Dangl, Nonndorf 12, 3830, Austria [gerhard@dangl.at]
OBS G. Dangl
MEA G. Dangl
TEL 0.25-m f/4.8 reflector + CCD
ACK MPCReport file updated 2011.11.17 14:00:12
AC2 gerhard@dangl.at
NET UCAC-3
K05Y55U C2011 11 14.84279 02 27 45.44 +16 44 33.3 15.6 V C47
K05Y55U C2011 11 14.84612 02 27 45.64 +16 44 32.8 15.5 V C47
K05Y55U C2011 11 14.84939 02 27 45.87 +16 44 32.2 15.7 V C47
K05Y55U C2011 11 14.85728 02 27 46.39 +16 44 30.8 15.7 V C47
----- end -----
Astrometry realized with Astrometrica from Herbert Raab.
Ephemerides and visibility table of asteroid 2005 YU55
November 09 - November 23, 2011
(Update from November 09, 2011)
2005 YU55 Period of orbit 1.22 years (446.2 days) Perihelion distance 0.6525321 AU Aphelion distance 1.63 AU Semimajor axis a 1.14291 AU Exccentricity e 0.4290617 Inclination i 0.51348 deg Argument of perihelion 268.77797 deg Long. ascending node 39.31631 deg Mean anomaly 348.8496 deg Epoche 2011 11 01 Rotation periode about 18 hours
The orbit position of asteroid 2005 YU55 in the inner solar system
Diagram created with EasySky from Matthias Busch
January 05, 2012 |
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