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Post Info TOPIC: Kuiper Belt Object 2008 OG19
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Kuiper Belt Object 2008 OG19
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Title: 2008 OG19: A highly elongated Trans-Neptunian Object
Author: Estela Fernández-Valenzuela, Jose Luis Ortiz, René Duffard, Pablo Santos-Sanz, Nicolás Morales

From two observing runs during the 2014 summer at Calar Alto Observatory in Almería (Spain) and at Sierra Nevada Observatory in Granada (Spain), we were able to derive CCD photometry of the Trans-Neptunian Object 2008 OG19. We analysed the time series and obtained a double-peaked light curve with a peak to valley amplitude of (0.437 ± 0.011) mag and a rotational period of (8.727± 0.003) h. This implies that this object is very elongated, closely resembling Varuna's case. The photometry also allowed us to obtain an absolute magnitude in R-band of (4.39 ± 0.07) mag. From this result we estimated an equivalent diameter of 2008 OG19 which is 619^{+56}_{-113} km using an average albedo for Scattered Disk Objects. Finally we interpreted the results under the assumption of hydrostatic equilibrium and found a lower limit for the density of 554^{+42}_{-4} kgm-3. However, a more likely density is (609 ± 4) kgm-3 using an aspect angle of 60°, which corresponds to the most likely configuration for the spin axis with respect to the observer assuming random orientations.

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Kuiper Belt Object 2008 OG19 is at Opposition (37.588 AU) in the constellation Capricornus on the 2nd August 2015.  

Ephemeris

Date       UT      R.A. (J2000) Decl.    Delta     r     El.    Ph.   Mag
2015 08 01 000000 20 36 02.7 -10 26 24  37.588  38.594  172.1   0.2  20.5
2015 08 02 000000 20 35 57.8 -10 26 46  37.588  38.594  172.1   0.2  20.5
2015 08 03 000000 20 35 53.0 -10 27 09  37.589  38.594  171.9   0.2  20.5
2015 08 04 000000 20 35 48.1 -10 27 31  37.590  38.594  171.7   0.2  20.5
2015 08 05 000000 20 35 43.2 -10 27 54  37.591  38.594  171.4   0.2  20.5
2015 08 06 000000 20 35 38.4 -10 28 17  37.592  38.594  170.9   0.2  20.5
2015 08 07 000000 20 35 33.6 -10 28 41  37.594  38.594  170.4   0.3  20.5
2015 08 08 000000 20 35 28.7 -10 29 04  37.596  38.594  169.8   0.3  20.5
2015 08 09 000000 20 35 23.9 -10 29 28  37.598  38.594  169.2   0.3  20.5
2015 08 10 000000 20 35 19.2 -10 29 51  37.600  38.594  168.5   0.3  20.5
2015 08 11 000000 20 35 14.4 -10 30 15  37.603  38.594  167.8   0.3  20.5
2015 08 12 000000 20 35 09.6 -10 30 39  37.606  38.594  167.0   0.3  20.5
2015 08 13 000000 20 35 04.9 -10 31 04  37.609  38.594  166.2   0.4  20.5
2015 08 14 000000 20 35 00.2 -10 31 28  37.613  38.594  165.4   0.4  20.5
2015 08 15 000000 20 34 55.5 -10 31 52  37.617  38.595  164.6   0.4  20.5
2015 08 16 000000 20 34 50.9 -10 32 17  37.621  38.595  163.7   0.4  20.5
2015 08 17 000000 20 34 46.3 -10 32 41  37.626  38.595  162.9   0.4  20.5
2015 08 18 000000 20 34 41.7 -10 33 06  37.631  38.595  162.0   0.5  20.5
2015 08 19 000000 20 34 37.1 -10 33 31  37.636  38.595  161.1   0.5  20.5
2015 08 20 000000 20 34 32.6 -10 33 56  37.641  38.595  160.2   0.5  20.5
2015 08 21 000000 20 34 28.1 -10 34 21  37.647  38.595  159.3   0.5  20.5
2015 08 22 000000 20 34 23.7 -10 34 46  37.652  38.595  158.4   0.6  20.5
2015 08 23 000000 20 34 19.3 -10 35 11  37.659  38.595  157.5   0.6  20.5
2015 08 24 000000 20 34 15.0 -10 35 36  37.665  38.595  156.6   0.6  20.5
2015 08 25 000000 20 34 10.7 -10 36 01  37.672  38.595  155.7   0.6  20.5
2015 08 26 000000 20 34 06.4 -10 36 26  37.679  38.595  154.7   0.6  20.5
2015 08 27 000000 20 34 02.2 -10 36 51  37.686  38.595  153.8   0.7  20.5
2015 08 28 000000 20 33 58.0 -10 37 16  37.693  38.595  152.9   0.7  20.5
2015 08 29 000000 20 33 53.9 -10 37 41  37.701  38.595  151.9   0.7  20.5
2015 08 30 000000 20 33 49.8 -10 38 06  37.709  38.595  151.0   0.7  20.5
2015 08 31 000000 20 33 45.8 -10 38 32  37.717  38.595  150.0   0.7  20.5


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