J/A+A/498/313 Photometry of 3 main belt asteroids (Marciniak+, 2009)
Photometry and models of selected main belt asteroids.
VI. 160 Una, 747 Winchester, and 849 Ara.
Marciniak A., Michalowski T., Hirsch R., Polinska M.,
Kaminski K., Kwiatkowski T., Kryszczynska A., Behrend R.,
Bernasconi L., Michalowski J., Starczewski S., Fagas M., Sobkowiak K.
<Astron. Astrophys. 498, 313 (2009)>
=2009A&A...498..313M 2009A&A...498..313M
ADC_Keywords: Minor planets ; Photometry
Keywords: techniques: photometric - minor planets: asteroids
Abstract:
We present a set of new photometric observations of three main belt
asteroids: 160 Una, 747 Winchester, and 849 Ara. This, combined with
the available data, allowed us to construct their physical models. The
lightcurve inversion method was used to obtain their spins and shapes.
We have resolved problems with the rotation period of 160 Una, and
found it to be 11.033176±0.000011h, almost twice the value given in
the literature.
Description:
Table aspdat.dat contains aspect data for all of the observing runs,
that is: distances from the object to th Sun and to the Earth in AU,
phase angles and ecliptic coordinates of a given asteroid at a given
moment. The last column contains the observatory code.
The files *lcs.dat contain asteroid brightness and geometry for
corresponding epochs. These files were used for obtaining shape models
and spin states of the asteroids. All lightcurves are relative.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
objects.dat 68 3 Asteroid fundamental parameters
aspdat.dat 67 61 Aspect data of 160 Una, 747 Winchester and
849 Ara
160lcs.dat 111 933 Asteroid 160 Una individual lightcurves
747lcs.dat 111 2173 Asteroid 747 Winchester individual lightcurves
849lcs.dat 111 480 Asteroid 849 Ara individual lightcurves
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2009)
Byte-by-byte Description of file: objects.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ast Asteroid number
5- 14 A10 --- Name Asteroid name
16- 19 F4.2 mag H Absolute magnitude H parameter (1)
21- 25 F5.1 km Diam IRAS diameter (1)
27- 35 F9.6 deg i Inclination (1)
37- 46 F10.8 --- e Eccentricity (1)
48- 57 F10.8 AU a Semimajor axis (1)
59- 68 A10 --- FileName Name of the file containing the light curve
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Note (1): Data from The Asteroid Orbital Elements Database, Cat. B/astorb.
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Byte-by-byte Description of file: aspdat.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ast Asteroid number
5- 14 A10 --- Name Asteroid name
16- 19 I4 yr Obs.Y Year of an observation
21- 22 I2 m Obs.M Month of an observation
24- 27 F4.1 d Obs.D Mid-time of an observation in days
30- 35 F6.4 AU r Distance from object to the Sun
37- 42 F6.4 AU delta Distance from object to the Earth
44- 48 F5.2 deg phAngle Sun-asteroid-Earth phase angle
50- 55 F6.2 deg Elon J2000 ecliptic longitude of object (λ)
57- 62 F6.2 deg Elat J2000 ecliptic latitude of object (β)
64- 67 A4 --- Site Observation site (1)
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Note (1): Observatory codes as follows:
Bor = Borowiec
EnO = Les Engarouines Observatory
SAAO = South African Astronomical Observatory
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Byte-by-byte Description of file: 160lcs.dat 747lcs.dat 849lcs.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d JD JD epoch corrected for the light-time
corresponding to the Earth-asteroid distance
16- 27 E12.7 --- br Relative brightness in intensity units,
mean brightness of each lightcurve is unity
29- 41 E13.8 AU Sx x component of the vector from the asteroid to
the Sun in J2000 ecliptic Cartesian coordinates
43- 55 E13.8 AU Sy y component of the vector from the asteroid to
the Sun in J2000 ecliptic Cartesian coordinates
57- 69 E13.6 AU Sz z component of the vector from the asteroid to
the Sun in J2000 ecliptic Cartesian coordinates
71- 83 E13.8 AU Ex x component of the vector from the asteroid to
the Earth in J2000 ecliptic Cartesian coordinates
85- 97 E13.8 AU Ey y component of the vector from the asteroid to
the Earth in J2000 ecliptic Cartesian coordinates
99-111 E13.8 AU Ez z component of the vector from the asteroid to
the Earth in J2000 ecliptic Cartesian coordinates
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Acknowledgements:
A. Marciniak, aniab(at)lab.astro.amu.edu.pl
References:
Michalowski et al., Paper I 2004A&A...416..353M 2004A&A...416..353M
Michalowski et al., Paper II 2005A&A...443..329M 2005A&A...443..329M
Michalowski et al., Paper III 2006A&A...459..663M 2006A&A...459..663M
Marciniak et al., Paper IV 2007A&A...473..633M 2007A&A...473..633M
Marciniak et al., Paper V 2008A&A...478..559M 2008A&A...478..559M
(End) Patricia Vannier [CDS] 12-Feb-2009