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Post Info TOPIC: Asteroid 15 Eunomia


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Asteroid (15) Eunomia
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Eunomia was discovered by Annibale de Gasparis on July 29, 1851 and named after Eunomia, one of the Horae (Hours), a personification of order and law in Greek mythology.
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Google sky file: Asteroid (15) Eunomia 2011.kmz (7kb, kmz)

Ephemeris

Date       UT      R.A. (J2000) Decl.    Delta     r     El.    Ph.   V 
2011 07 03 000000 02 16 07.6 +24 26 37   2.456   2.158   61.2  24.4   9.9
2011 07 13 000000 02 34 45.7 +26 23 54   2.357   2.153   65.9  25.5   9.9
2011 07 23 000000 02 53 06.9 +28 13 54   2.256   2.149   70.9  26.5   9.8
2011 08 02 000000 03 11 00.0 +29 56 10   2.152   2.147   76.0  27.3   9.7
2011 08 12 000000 03 28 09.7 +31 30 18   2.048   2.146   81.5  27.8   9.6
2011 08 22 000000 03 44 19.1 +32 56 12   1.942   2.146   87.2  28.1   9.5
2011 09 01 000000 03 59 04.9 +34 13 53   1.837   2.147   93.3  28.0   9.4
2011 09 11 000000 04 11 59.7 +35 23 19   1.733   2.149   99.9  27.5   9.2
2011 09 21 000000 04 22 33.7 +36 24 25   1.633   2.153  107.0  26.5   9.1
2011 10 01 000000 04 30 11.5 +37 16 30   1.537   2.157  114.7  24.9   8.9
2011 10 11 000000 04 34 19.7 +37 57 48   1.450   2.163  123.1  22.7   8.7
2011 10 21 000000 04 34 33.4 +38 25 17   1.372   2.170  132.2  19.9   8.5
2011 10 31 000000 04 30 42.9 +38 34 12   1.309   2.178  141.8  16.4   8.3
2011 11 10 000000 04 23 15.2 +38 19 03   1.264   2.187  151.7  12.4   8.2
2011 11 20 000000 04 13 17.7 +37 36 06   1.241   2.198  160.5   8.6   8.0
2011 11 30 000000 04 02 30.8 +36 25 47   1.242   2.209  164.5   6.8   7.9
2011 12 10 000000 03 52 49.4 +34 54 39   1.269   2.221  160.1   8.7   8.1
2011 12 20 000000 03 45 42.2 +33 13 37   1.321   2.234  151.2  12.3   8.3
2011 12 30 000000 03 41 59.5 +31 33 57   1.395   2.248  141.2  15.9   8.5
2012 01 09 000000 03 41 56.4 +30 04 20   1.489   2.262  131.4  19.0   8.8
2012 01 19 000000 03 45 18.8 +28 49 12   1.598   2.278  122.0  21.5   9.0


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Asteroid (15) Eunomia is at opposition on the 27th June, 2010.

(V = 9.0)

Ephemeris
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V

2010 06 05 18 45.16 -29 52.8 1.875 2.820 153.4 9.3 9.5
2010 06 10 18 40.95 -29 46.3 1.840 2.811 158.9 7.5 9.3
2010 06 15 18 36.25 -29 37.9 1.810 2.802 164.4 5.6 9.2
2010 06 20 18 31.17 -29 27.4 1.788 2.793 169.6 3.8 9.1
2010 06 25 18 25.86 -29 14.6 1.772 2.784 173.6 2.3 9.0
2010 06 30 18 20.45 -28 59.4 1.763 2.775 173.4 2.4 9.0


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RE: Asteroid 15 Eunomia
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  (15) Eunomia
Epoch 2007 Oct. 27.0 TT = JDT 2454400.5 Goffin
M 40.77241 (2000.0) P Q
n 0.22924719 Peri. 97.89697 +0.83665408 -0.51485950
a 2.6440319 Node 293.26767 +0.38713194 +0.79723420
e 0.1874178 Incl. 11.73823 +0.38747750 +0.31517825
P 4.30 H 5.28 G 0.23 U 0


Ephemeris
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2008 01 01 07 37.27 +23 40.0 1.471 2.440 167.5 5.0 8.4
2008 01 06 07 31.58 +23 26.2 1.470 2.450 173.8 2.5 8.3
2008 01 11 07 25.81 +23 11.4 1.476 2.460 178.7 0.5 8.2
2008 01 16 07 20.14 +22 55.7 1.490 2.470 173.2 2.7 8.4
2008 01 21 07 14.76 +22 39.2 1.511 2.480 167.0 5.1 8.5
2008 01 26 07 09.83 +22 22.0 1.539 2.490 160.8 7.5 8.7
2008 01 31 07 05.47 +22 04.5 1.573 2.500 154.8 9.7 8.8



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On 30th November , from 07:12 UT to 7:24 UT , the magnitude 9.1 asteroid (15) Eunomia occults the magnitude 10 star TYC 1930-01565-1 in the constellation Gemini.
The occultation should occur around 07:18 UT, and last 72 seconds, and be just visible as a half magnitude drop in brightness.
Visible in Alaska

TYC 1930-01565-1.kmz
Google Sky file (1kb, kmz)

TYC 1930-01565-1
Expand (9kb, 560 x 389)

Position(2000): RA 08h 00m 56.142s, Dec 24 59 31.81

As the largest S-type asteroid (with 3 Juno being a very close second), Eunomia has attracted a moderate amount of scientific attention. It contains slightly over one percent of the mass of the entire main belt.
Eunomia appears to be an elongated (330 x 245 x 205km) but fairly regularly shaped body, with what appear to be four sides of differing curvature and noticeably different average compositions. Its elongation led to the suggestion that Eunomia may be a binary object.

 Date UTC R.A Dec. Distance V.Mag 
h m s h m s o ' " au.
 2007-11-28T12:00: 0.00 8 1 19.23086 +25 4 35.3600 1.634756396 9.10  
2007-11-29T12:00: 0.00 8 1 7.15804 +25 1 48.5551 1.626696956 9.09
2007-11-30T12:00: 0.00 8 0 52.94450 +24 59 3.9132 1.618781456 9.07
2007-12-01T12:00: 0.00 8 0 36.58985 +24 56 21.3709 1.611014827 9.05
2007-12-02T12:00: 0.00 8 0 18.09627 +24 53 40.8556 1.603402079 9.03
2007-12-03T12:00: 0.00 7 59 57.46869 +24 51 2.2852 1.595948284 9.01
2007-12-04T12:00: 0.00 7 59 34.71481 +24 48 25.5689 1.588658550 8.99




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Asteroid 15 Eunomia at magnitude 8.4, is at opposition on the 29th July, 2006. The asteroid is best viewed from the southern hemisphere.
Eunomia is moving in a retrograde direction towards the west.

15Eunomia290706

15 Eunomia is a large asteroid in the inner main asteroid belt. It is the largest of the stony (S-type) asteroids, and somewhere between the 8th to 12th largest Main Belt asteroid overall (uncertainty in diameters causes uncertainty in its ranking). It is also the largest member of the Eunomia family of asteroids.
Eunomia was discovered by A. de Gasparis on July 29, 1851 and named after Eunomia, one of the Horae (Hours), a personification of order and law in Greek mythology.

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