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J/AJ/153/116    Trojan asteroids in the Kepler campaign 6 field    (Ryan+, 2017)

Trojan asteroids in the Kepler campaign 6 field. Ryan E.L., Sharkey B.N.L., Woodward C.E. <Astron. J., 153, 116-116 (2017)> =2017AJ....153..116R (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Photometry ; Solar system Keywords: minor planets, asteroids: general Abstract: We report on a Kepler spacecraft survey during the K2 mission to characterize the rotational properties of 56 Trojan asteroids in the L4 cloud. More than one rotational period was observed for 51 of these targets, allowing for well constrained lightcurve rotation periods and amplitudes, five of which are found to be in conflict with previously published values. We find ∼10% of objects have rotational periods longer than 100hr, an excess of slow rotators 10 times larger than suggested from the literature. Investigation of the rotational frequencies of our Kepler sample when combined with high-quality lightcurves in the literature reveals the distribution of rotational frequencies is non-Maxwellian even when consideration is given to size-dependent variations in rotational rate. From investigation of lightcurve shapes and amplitudes, we estimate the binary fraction within the Trojan population to be ∼6%-36% depending on the methodology utilized to identify binary candidates. Description: To obtain high-precision (i.e., differential micro-magnitude) photometric measurements of Trojan asteroids, we utilized the Kepler spacecraft during Campaign 6 of the K2 Mission (Howell et al. 2014, Cat. IV/34). The Kepler spacecraft imager has a 110 square degree Field Of View (FOV) with 4 arcsec pixels. The Kepler FOV is covered by 21 camera modules, each of which is comprised of two CCDs, wherein each CCD is read from two amplifiers which are labelled as Kepler channels. During Campaign 6 the center of the Kepler FOV was centered at R.A. (J2000)=13:39:28 and decl. (J2000)=-11:17:43 which overlapped with the Trojan L4 cloud. This field was observed from 2015 July 14 to September 30. A list of observing circumstances for all of the observed Trojan asteroids over the ∼80 day campaign is given in Table1. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 104 56 Trojan Observing Circumstances table2.dat 91 56 Trojan fitted lightcurve properties table3.dat 123 51 Trojan fitted lightcurve components
See also: B/astorb : Orbits of Minor Planets (Bowell+ 2014) IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017) J/AJ/134/1133 : Fraction of contact binary trojan asteroids (Mann+, 2007) J/ApJ/742/40 : Jovian Trojans asteroids with WISE/NEOWISE (Grav+, 2011) J/ApJ/759/49 : Jovian Trojan asteroids with WISE/NEOWISE: taxonomy (Grav+, 2012) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- Ast [1143/353363] Asteroid number 8- 19 A12 --- Name Asteroid name 21- 29 F9.1 d JD0 Starting Julian Date 31- 39 F9.1 d JD1 Ending Julian Date 41- 45 F5.3 AU HDist0 [4.713/5.955] Lower range of heliocentric distance 46 A1 --- --- [-] 47- 51 F5.3 AU HDist1 [4.72/5.958] Upper range of heliocentric distance 53- 57 F5.3 AU KDist0 [3.955/5.513] Lower range of Kepler-centric distance 58 A1 --- --- [-] 59- 63 F5.3 AU KDist1 [4.1/5.717] Upper range of Kepler-centric distance 65- 70 F6.3 deg Angle0 [7.021/12.19] Lower range of phase angle 71 A1 --- --- [-] 72- 77 F6.3 deg Angle1 [8.516/12.274] Upper range of phase angle 79- 84 F6.3 deg bPAB [-7.631/6.197] Mean PAB ecliptic latitude βPAB 86- 92 F7.3 deg lPAB [204.975/218.819] Mean PAB ecliptic longitude λPAB 94-104 A11 --- Ch Kepler channel(s)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 A1 --- Type [WS] Type of light curve (1) 3- 8 I6 --- Ast [1143/353363] Asteroid number 10- 21 A12 --- Name Asteroid name 23 A1 --- f_Name [a] Flag on Name (2) 25- 36 F12.4 d T0 Epoch T0 in Julian Date 38- 44 F7.3 h Per [5.4/562.134] Period 46- 51 F6.3 h e_Per [0.021/36] Error in Per 53- 57 F5.3 mag EAmp [0.068/0.873]? Extrema amplitude 59- 63 F5.3 mag e_EAmp [0.01/0.267]? Error in EAmp 65- 69 F5.3 deg MAmp [0.039/0.47] Mean to peak amplitude 71- 75 F5.2 mag Mag [7.93/12.7] Minor Planet Center (MPC) absolute magnitude 77- 83 F7.3 km Diam [13.386/114.624] Effective diameter 85 A1 --- f_Diam [b] Flag on Diam (3) 87- 91 F5.3 km e_Diam [0.307/6.581]? Error in Diam
Note (1): Type as follows: W = Well constrained lightcurve; S = Slow rotator. Note (2): Flag as follows: a = These objects have lightcurves with inverted U-V-shaped lightcurves characteristic of eclipsing contact binary systems. Note (3): Flag as follows: b = These objects have diameters estimated utilizing the MPC derived absolute magnitude and a mean albedo of 0.06 derived from WISE results of Grav et al. (2011, J/ApJ/742/40; 2012, J/ApJ/759/49).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 I6 --- Ast [1143/353363] Asteroid number 8- 13 F6.3 mag KpMag [8.4/13] Fitted absolute Kepler magnitude 15- 19 F5.3 mag e_KpMag [0.002/0.024] Uncertainty in KpMag 21- 26 F6.3 mag A1 [-0.045/0.056] Amplitude of first fitted Fourier cosine term 28- 32 F5.3 mag e_A1 [0.003/0.036] Uncertainty in A1 34- 39 F6.3 mag B1 [-0.053/0.041] Amplitude of first fitted Fourier sine term 41- 45 F5.3 mag e_B1 [0.002/0.032] Uncertainty in B1 47- 52 F6.3 mag A2 [-0.28/0.201] Amplitude of second fitted Fourier cosine term 54- 58 F5.3 mag e_A2 [0.003/0.034] Uncertainty in A2 60- 65 F6.3 mag B2 [-0.406/0.362] Amplitude of second fitted Fourier sine term 67- 71 F5.3 mag e_B2 [0.002/0.035] Uncertainty in B2 73- 78 F6.3 mag A3 [-0.048/0.034] Amplitude of third fitted Fourier cosine term 80- 84 F5.3 mag e_A3 [0.003/0.032] Uncertainty in A3 86- 91 F6.3 mag B3 [-0.03/0.028] Amplitude of third fitted Fourier sine term 93- 97 F5.3 mag e_B3 [0.002/0.035] Uncertainty in B3 99-104 F6.3 mag A4 [-0.055/0.045] Amplitude of fourth fitted Fourier cosine term 106-110 F5.3 mag e_A4 [0.003/0.036] Uncertainty in A4 112-117 F6.3 mag B4 [-0.072/0.036] Amplitude of fourth fitted Fourier sine term 119-123 F5.3 mag e_B4 [0.003/0.032] Uncertainty in B4
History: From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 10-Jul-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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