Characterizing asteroid (152830) Dinkinesh in preparation for the encounter with the NASA Lucy mission: a photometric study

被引：4
作者：
Mottola, Stefano [1 ]
Denk, Tilmann [1 ]
Marchi, Simone [2 ]
Binzel, Richard P. [3 ]
Noll, Keith S. [4 ]
Spencer, John R. [2 ]
Levison, Harold F. [2 ]
机构：
[1] German Aerosp Ctr DLR, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany
[2] Southwest Res Inst, 1050 Walnut St, Boulder, CO 80302 USA
[3] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
[4] Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 524卷 / 01期
关键词：
techniques: photometric; minor planets; asteroids: individual: (152830) Dinkinesh; NEAR-EARTH OBJECTS; ABSOLUTE MAGNITUDES; PHASE FUNCTION; MAIN-BELT; ROTATION; PARAMETERS; TARGET; G(1);
D O I：
10.1093/mnrasl/slad066
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Main Belt asteroid (152830) Dinkinesh will be the first fly-by target of the Lucy mission on 2023 November 1, during its cruise to the Trojan clouds. We report our photometric time series observations of this target performed on 14 nights over nearly three months during the 2022-23 apparition with the 1.23-m telescope at Calar Alto, Spain, aimed at determining its rotation and photometric properties. We find that Dinkinesh is a slow rotator (P-syn = 52.67 +/- 0.04h) with a moderately large light-curve amplitude (A = 0.39 +/- 0.02), which implies an axial ratio a/b greater than or similar to 1.43. Its photometric parameters in the HG-system are H-R = 17.17 +/- 0.04 and G(R) = 0.378 +/- 0.035 with a colour index = 0.455 +/- 0.025. A fit to the IAU system results in = 17.17 +/- 0.14; G(1) = 0.37 +/- 0.17 and G(2) = 0.43 +/- 0.04. Assuming that Dinkinesh's albedo lies within +/- 2 sigma of the average value for small S-class asteroids, its spherical surface-equivalent diameter is between 0.66 and 1.36km.
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页码：L1 / L4
页数：4
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