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Title: Visible and near-infrared observations of asteroid 2012 DA14 during its closest approach of February 15th, 2013
Authors: J. de Leon, J. L. Ortiz, N. Pinilla-Alonso, A. Cabrera-Lavers, A. Alvarez-Candal, N. Morales, R. Duffard, P. Santos-Sanz, J. Licandro, A. Perez-Romero, V. Lorenzi

Near-Earth asteroid 2012 DA14 made its closest approach on February 15th, 2013, when it passed at a distance of 27,700 km from the Earth's surface (inside the geosynchronous satellite ring). It was the first time an asteroid of moderate size was predicted to get that close to the Earth, becoming bright enough to permit a detailed study from ground based telescopes. Asteroid 2012 DA14 was poorly characterised before its closest approach. The main objective of this work was to obtain new and valuable data to better understand its physical properties, and to evaluate the effects of such a close approach on the object. We acquired data using several telescopes on four Spanish observatories: the 10.4m Gran Telescopio Canarias and the 3.6m Telescopio Nazionale Galileo, both in "El Roque de los Muchachos" Observatory (ORM, La Palma); the 2.2m CAHA telescope, in "Calar Alto2 Observatory (Almeria); the f/3 0.77m telescope in "La Hita" Observatory (Toledo); and the f/8 1.5m telescope in "Sierra Nevada" Observatory (Granada). We obtained visible and near-infrared colour photometry, visible spectra and time-series photometry. Visible spectra together with visible and near-infrared colour photometry of 2012 DA14 show that the object can be classified as an L-type asteroid, a not very common spectral type among the asteroid population. The time-series photometry indicates a rotational period around 9 hours, and the large amplitude of the variation suggests that the object is very elongated and irregular, with an equivalent diameter around 22m. We obtain an absolute magnitude of H_R = 24.1 ± 0.2, corresponding to 24.6 ± 0.2 in V. From the absolute photometry, together with some constraints on size and shape, we compute a geometric albedo of p_V = 0.34 ± 0.20.

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Orbital elements:
2012 DA14                                                Earth MOID = 0.0001 AU
Epoch 2013 Apr. 18.0 TT = JDT 2456400.5                 MPC
M 231.09353              (2000.0)            P               Q
n   1.13477687     Peri.  195.53823     +0.95091096     +0.28940573
a   0.9103235      Node   146.99580     -0.25814720     +0.93713366
e   0.0894020      Incl.   11.60807     -0.17067037     +0.19499955
P   0.87           H   24.1           G   0.15           U   0

MPEC 2013 - C72

Key to Orbital elements



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Asteroid 2012 DA14 Flies by Earth Safely 



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NASA Follows Asteroid Flyby

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Google earth file: Asteroid 2012 DA14.kmz (19kb, kmz) (Version 8)



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Australia to have grandstand view of Asteroid 2012 DA14 and its near-miss with Earth

Experts have recommended people look below the Southern Cross about 4.30am AEDT onwards.
The best views will be on the west coast, though maybe not in Perth itself because of the ambient light. If you're in a rural area of WA, check the skies around 2.30am local time.
 
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Asteroid 2012 DA14 To Whiz Past Earth Safely

 



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Ephemeris

Date       UT      R.A. (J2000) Decl.    Delta     r     El.    Ph.   Mag
2013 02 14 200000 00 35 31.2 -74 28 07   0.0036  0.986   65.7 114.1  16.4
2013 02 14 210000 00 36 15.4 -74 39 24   0.0035  0.986   65.8 114.0  16.2
2013 02 14 220000 00 37 04.7 -74 51 42   0.0033  0.986   66.0 113.8  16.1
2013 02 14 230000 00 38 00.2 -75 05 08   0.0032  0.986   66.2 113.6  16.0
2013 02 15 000000 00 39 03.0 -75 19 54   0.0030  0.987   66.5 113.4  15.9
2013 02 15 010000 00 40 14.9 -75 36 11   0.0029  0.987   66.7 113.1  15.7
2013 02 15 020000 00 41 37.8 -75 54 15   0.0027  0.987   67.0 112.9  15.6
2013 02 15 030000 00 43 14.6 -76 14 23   0.0026  0.987   67.3 112.6  15.5
2013 02 15 040000 00 45 09.1 -76 36 59   0.0024  0.987   67.7 112.2  15.3
2013 02 15 050000 00 47 26.6 -77 02 31   0.0023  0.987   68.1 111.8  15.1
2013 02 15 060000 00 50 15.0 -77 31 35   0.0021  0.987   68.5 111.4  15.0
2013 02 15 070000 00 53 45.8 -78 04 59   0.0020  0.987   69.0 110.9  14.8
2013 02 15 080000 00 58 17.6 -78 43 42   0.0018  0.987   69.7 110.3  14.6
2013 02 15 090000 01 04 21.0 -79 29 06   0.0017  0.987   70.4 109.5  14.3
2013 02 15 100000 01 12 51.2 -80 22 54   0.0015  0.987   71.2 108.7  14.1
2013 02 15 110000 01 25 37.8 -81 27 25   0.0014  0.987   72.3 107.6  13.8
2013 02 15 120000 01 46 49.1 -82 45 10   0.0012  0.988   73.6 106.3  13.4
2013 02 15 130000 02 27 39.4 -84 17 05   0.0011  0.988   75.3 104.6  13.1
2013 02 15 140000 04 04 12.2 -85 48 51   0.00091 0.988   77.6 102.3  12.6
2013 02 15 150000 07 24 35.2 -85 44 09   0.00076 0.988   80.8  99.1  12.1
2013 02 15 160000 09 48 51.0 -81 49 19   0.00061 0.988   85.6  94.3  11.4
2013 02 15 170000 10 47 28.6 -73 32 31   0.00046 0.988   93.6  86.4  10.4
2013 02 15 180000 11 15 45.4 -57 27 49   0.00033 0.988  108.2  71.8   9.2
2013 02 15 190000 11 32 41.9 -24 56 27   0.00024 0.988  135.9  44.1   7.7
2013 02 15 200000 11 45 26.8 +20 09 38   0.00025 0.988  153.0  27.0   7.3
2013 02 15 210000 11 57 38.6 +49 18 26   0.00035 0.988  135.6  44.4   8.5
2013 02 15 220000 12 10 58.1 +63 45 40   0.00049 0.988  123.6  56.3   9.5
2013 02 15 230000 12 26 16.7 +71 39 03   0.00063 0.988  116.7  63.3  10.3
2013 02 16 000000 12 44 15.6 +76 28 15   0.00078 0.988  112.3  67.6  10.9
2013 02 16 010000 13 05 36.4 +79 39 08   0.00093 0.988  109.3  70.6  11.4
2013 02 16 020000 13 31 00.7 +81 51 13   0.0011  0.988  107.2  72.8  11.8
2013 02 16 030000 14 01 01.8 +83 24 39   0.0012  0.988  105.5  74.4  12.1
2013 02 16 040000 14 35 47.8 +84 30 38   0.0014  0.988  104.2  75.7  12.4
2013 02 16 050000 15 14 37.9 +85 15 56   0.0015  0.988  103.2  76.7  12.7
2013 02 16 060000 15 55 49.1 +85 45 10   0.0017  0.988  102.3  77.6  12.9  
2013 02 16 070000 16 36 52.3 +86 01 59   0.0018  0.988  101.6  78.3  13.1
2013 02 16 080000 17 15 20.8 +86 09 35   0.0020  0.988  101.0  78.9  13.3 
2013 02 16 090000 17 49 36.8 +86 10 41   0.0021  0.988  100.5  79.4  13.5
2013 02 16 100000 18 19 04.4 +86 07 30   0.0023  0.988  100.0  79.8  13.7
2013 02 16 110000 18 43 54.1 +86 01 40   0.0025  0.988   99.6  80.2  13.8
2013 02 16 120000 19 04 39.5 +85 54 18   0.0026  0.988   99.3  80.6  14.0
2013 02 16 130000 19 22 00.1 +85 46 09   0.0028  0.988   98.9  80.9  14.1
2013 02 16 140000 19 36 33.4 +85 37 42   0.0029  0.989   98.7  81.2  14.2
2013 02 16 150000 19 48 51.2 +85 29 14   0.0031  0.989   98.4  81.4  14.3
2013 02 16 160000 19 59 19.4 +85 20 56   0.0032  0.989   98.2  81.7  14.5 
2013 02 16 170000 20 08 18.6 +85 12 54   0.0034  0.989   97.9  81.9  14.6 
2013 02 16 180000 20 16 05.2 +85 05 12   0.0035  0.989   97.7  82.1  14.7
2013 02 16 190000 20 22 52.1 +84 57 50   0.0037  0.989   97.5  82.2  14.8
2013 02 16 200000 20 28 49.3 +84 50 50   0.0038  0.989   97.4  82.4  14.9
2013 02 16 210000 20 34 05.2 +84 44 12   0.0040  0.989   97.2  82.6  14.9
2013 02 16 220000 20 38 46.2 +84 37 54   0.0041  0.989   97.1  82.7  15.0


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Near-Earth Asteroid Makes Preview Appearance

Like trailers for the coming attraction, new images show asteroid 2012 DA14 on its way to a record-close approach to Earth on Feb. 15. One image, taken by amateur astronomer Dave Herald of Murrumbateman, Australia, on Feb. 13, shows the asteroid as a tiny white dot in the field of view. Another set of animated images, obtained by the Faulkes Telescope South in Siding Springs, Australia, on Feb. 14, and animated by the Remanzacco Observatory in Italy, shows the asteroid as a bright spot moving across the night sky.
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Possible Seismic Activity on Asteroid 2012 DA14

New research by Richard Binzel, a professor of planetary science at MIT, suggests that many near-Earth asteroids experience a seismic jolt when they pass too close to our planets gravitational field.
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