J/A+A/527/A42 Photometry of asteroid (21) Lutetia (de Leon+, 2011)
Photometric and spectroscopic observations of asteroid (21) Lutetia 3 months
before the Rosetta fly-by.
de Leon, J., Duffard, R., Lara, L.M., Lin, Z.-Y.
<Astron. Astrophys. 527, A42 (2011)>
=2011A&A...527A..42D 2011A&A...527A..42D
ADC_Keywords: Minor planets ; Photometry, sequences
Keywords: minor planets - asteroids: general - methods: observational -
techniques: photometric - techniques: spectroscopic
Abstract:
On its journey to comet 67P/Churyumov-Gerasimenko, the International
Rosetta Mission (ESA) was planned to fly-by two asteroids: (2867)
Steins and (21) Lutetia. Although classified as an M-type asteroid
because of its high albedo, its reflectance spectrum in the near and
mid-infrared region, suggests a primitive composition, more typical of
C-type asteroids. Results from ground-based observations are
indicative of compositional variegation and of at least one
significantly large crater on the surface of this asteroid.
We analyse photometric and spectroscopic data of the asteroid,
obtained from ground-based observations, to support the data taken by
the spacecraft.
Description:
Table 2 shows relative magnitude of asteroid (21) Lutetia computed
from broad-band R photometric images taken with the 1m telescope at
Lulin observatory, Taiwan. The data was obtained during three
different nights on March, 2010. Zero rotational phase was chosen to
occur at JD = 2455273.3094 (March 17 at 19:25 UTC).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 31 306 Julian dates, phases and relative magnitudes of
the combined lightcurve presented in Figure 4
for asteroid (21) Lutetia
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See also:
J/A+A/521/A19 : 21 Lutetia UBVRI light curves (Lamy+, 2010)
Table:
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Planet Name H Diam i e a
mag km deg AU
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21 Lutetia 7.35 7.35 3.063841 0.16287028 2.43565549
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d JD Julian Date (1)
14- 18 F5.3 --- Phase Rotational Phase
20- 25 F6.3 --- Dmag Relative magnitude
27- 31 F5.3 --- e_Dmag Error in relative magnitude
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Note (1): Date of the observation:
* 19/03/2010: JD 2455275.0164 to 2455275.3253
* 20/03/2010: JD 2455275.9849 to 2455276.2818
* 21/03/2010: JD 2455276.9837 to 2455277.2902
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Acknowledgements:
J. de Leon, jleon(at)iaa.es
(End) J. de Leon [Inst. Astrof. Andalucia, Spain], P. Vannier [CDS] 13-Dec-2010