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J/ApJ/793/50       Observed light curve of (3200) Phaethon      (Ansdell+, 2014)

Refined rotational period, pole solution, and shape model for (3200) Phaethon. Ansdell M., Meech K.J., Hainaut O., Buie M.W., Kaluna H., Bauer J., Dundon L. <Astrophys. J., 793, 50 (2014)> =2014ApJ...793...50A (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Comets ; Photometry, CCD ; Solar system Keywords: minor planets, asteroids: individual: 3200 Phaethon - techniques: photometric Abstract: (3200) Phaethon exhibits both comet- and asteroid-like properties, suggesting it could be a rare transitional object such as a dormant comet or previously volatile-rich asteroid. This justifies detailed study of (3200) Phaethon's physical properties as a better understanding of asteroid-comet transition objects can provide insight into minor body evolution. We therefore acquired time series photometry of (3200) Phaethon over 15 nights from 1994 to 2013, primarily using the Tektronix 2048x2048 pixel CCD on the University of Hawaii 2.2 m telescope. We utilized light curve inversion to (1) refine (3200) Phaethon's rotational period to P=3.6032±0.0008 hr; (2) estimate a rotational pole orientation of λ=+85°±13° and β=-20°±10°; and (3) derive a shape model. We also used our extensive light curve data set to estimate the slope parameter of (3200) Phaethon's phase curve as G∼0.06, consistent with C-type asteroids. We discuss how this highly oblique pole orientation with a negative ecliptic latitude supports previous evidence for (3200) Phaethon's origin in the inner main asteroid belt as well as the potential for deeply buried volatiles fueling impulsive yet rare cometary outbursts. Description: We obtained time series photometry over 15 nights from 1994 to 2013. All but three nights used the Tektronix 2048x2048 pixel CCD camera on the University of Hawaii 2.2 m telescope on Mauna Kea. Two nights used the PRISM 2048x2048 pixel CCD camera on the Perkins 72 inch telescope at the Lowell Observatory in Flagstaff, Arizona, while one night used the Optic 2048x4096 CCD camera also on the University of Hawaii 2.2 m telescope. All observations used the standard Kron-Cousins R filter with the telescope guiding on (3200) Phaethon at non-sidereal rates. Raw images were processed with standard IRAF routines for bias subtraction, flat-fielding, and cosmic ray removal (Tody, 1986SPIE..627..733T). We constructed reference flat fields by median combining dithered images of either twilight or the object field (in both cases, flattening reduced gradients to <1% across the CCD). We performed photometry using the IRAF phot routine with circular apertures typically 5'' in radius, although aperture sizes changed depending on the night and/or exposure as they were chosen to consistently include 99.5% of the object's light. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file fig1.dat 33 590 Observed light curve of (3200) Phaethon
See also: II/190 : IRAS Minor Planet Survey (IMPS) (Tedesco 1992) Byte-by-byte Description of file: fig1.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d JD Julian Date of the observation 14- 20 F7.4 h Obs.h UT hour of the observation 22- 27 F6.3 mag Rmag The R band magnitude 29- 33 F5.3 mag e_Rmag Error in Rmag
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 24-Apr-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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