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Broad-band Photometry of the Near-Earth Asteroid 2014 CR.

ATel #5955; M. Hicks (JPL/Caltech), J. Frederick (PCC), I. Harley (PCC)
on 7 Mar 2014; 22:57 UT
Credential Certification: Michael D. Hicks (Michael.Hicks@jpl.nasa.gov)

Subjects: Optical, Asteroid, Planet (minor), Solar System Object, Near-Earth Object

The small near-Earth asteroid 2014 CR was discovered by the Catalina Sky Survey on February 5, 2014 (MPEC 2014-C16). Although the object's orbit passes very close to the Earth's orbit (Minimum Orbit Intersection Distance MOID = 0.021 AU), it is too small (H > 22 mag) to be considered a Potentially Hazardous Asteroid (PHA). The object passed within 0.021 AU (8.2 Lunar Distances) on February 29, 2014.

We obtained one night of Bessel BVRI photometry at the JPL Table Mountain 0.6-m telescope on February 22, as illustrated in Figure 1 and summarized in Table 1. The rotationally averaged colors (B-R=1.160+/-0.012; V-R=0.429+/-0.012; R-I=0.304+/-0.022) were compared to the ~1300 asteroid spectra in the SMASS2 database (Bus & Binzel 2002). The colors of 2014 CR were found to be most compatible with an Xc classification (Bus Taxonomy), as shown in Figure 2 and Table 2. Assuming a phase parameter g=0.05 (consistent with an Xc taxonomy) we measured a revised absolute magnitude H_V = 22.38+/-0.02 mag, implying an effective diameter on the order of 200 meters (albedo rho=0.05). Applying standard Fourier techniques and assuming a double-peaked lightcurve, we found a best-fit synodic period of 6.35+/-0.03 hr, as shown in Figure 3.

Copyright 2014. All rights reserved. The research described in this telegram was carried out at the Jet Propulsion Laboratory, under a contract with the National Aeronautics and Space Administration. The student participation was supported by the National Science Foundation under REU grant AST-1156756 to Los Angeles City College.

Table 1: Observational summary. 
UT Date    r(AU) d(AU) p(deg) V(mag) 
Feb 22.39  1.004        0.024  52.0        16.5 
Table 2: Top 5 spectral matches in the SMASS II database. 
                            Taxonomic Class  
Misfit  Asteroid Name      (Tholen)    (BUS) 
2.123    2996 Bowman                     Xc 
2.431    4786 Tatianina                  Xc 
2.534    3958 Komendantov                Xc 
2.817    1301 Yvonne                     C 
2.889     247 Eukrate          CP        Xc