List of slow rotators (minor planets)
# Minor planet designation Rotation period ( hours ) Δ mag Quality ( U ) Orbit or family Spectral type Diameter ( km ) Abs . mag ( H ) Refs
16 ( 38063 ) 1999 FH 990 0.55 2 Mars crosser S 3.92 14.40 LCDB · List
17 ( 86106 ) 1999 RP 113 975.1 0.74 2 Eos S 4.44 14.51 LCDB · List
18 14436 Morishita 972.8 0.82 2 MBA ( inner ) S 3.49 14.65 LCDB · List
19 ( 87231 ) 2000 OB 43 967.3 0.58 2 Eunomia S 2.94 14.97 LCDB · List
20 ( 58651 ) 1997 WL 42 938.2 0.47 2 MBA ( inner ) S 2.36 15.50 LCDB · List
21 9000 Hal 908 0.90 2+ Flora S 4.11 14.10 LCDB · List
22 ( 42843 ) 1999 RV 11 894 1.32 2 Phocaea S 3.49 14.50 LCDB · List
23 3233 Krisbarons 888 1.44 2 Flora S 6.51 13.10 LCDB · List
24 ( 37586 ) 1991 BP 2 887 0.96 2+ Phocaea S 5.53 13.50 LCDB · List
25 831 Stateira 861 0.64 3− Flora S 6.81 13.00 LCDB · List
26 2974 Holden 856 0.70 2+ Flora S 6.21 13.20 LCDB · List
27 ( 391033 ) 2005 TR 15 850 1.00 2 NEO S 0.45 19.10 LCDB · List
28 ( 29733 ) 1999 BA 4 849.2 0.74 2 Vestian S 3.88 14.42 LCDB · List
29 2672 Písek 831 0.90 2+ Eunomia S 9.60 12.40 LCDB · List
30 12867 Joeloic 813 0.71 2+ Flora S 4.94 13.70 LCDB · List
31 2862 Vavilov 800 0.40 2 Flora S 7.82 12.70 LCDB · List
32 ( 22166 ) 2000 WX 154 800 0.46 2 MBA ( inner ) S 4.61 15.02 LCDB · List
33 8109 Danielwilliam 790 0.60 2 Phocaea S 3.17 14.71 LCDB · List
34 ( 47069 ) 1998 XC 73 784.5 0.38 2 MBA ( outer ) C 10.06 13.72 LCDB · List
35 1663 van den Bos 740 0.80 3− Flora S 12.25 11.90 LCDB · List
Periods between 500 and 1000 hours
This is a list of slow rotators - minor planets that have an exceptionally long rotation period. This period, typically given in hours, and sometimes called rotation rate or spin rate, is a fundamental standard physical property for minor planets. In recent years, the periods of many thousands of bodies have been obtained from photometric and, to a lesser extent, radiometric observations. The periods given in this list are sourced from the Light Curve Data Base (LCDB), which contains lightcurve data for more than 15,000 bodies. Most minor planets have rotation periods between 2 and 20 hours. , a group of approximately 650 bodies, typically measuring 1-20 kilometers in diameter, have periods of more than 100 hours or 4 days. Among the , there are currently 15 bodies with a period longer than 1000 hours. According to the Minor Planet Center, the sharp lower limit of approximately 2.2 hours is due to the fact that most smaller bodies are thought to be rubble piles - conglomerations of smaller pieces, loosely coalesced under the influence of gravity - that fly apart if the period is shorter than this limit. The few minor planets rotating faster than 2.2 hours, therefore, can not be merely held together by self-gravity, but must be formed of a contiguous solid. As with orbital periods, a rotational period can be sidereal or synodic to describe a full rotation with respect to the fixed stars (sidereal) and Sun (synodic), respectively. In most cases, the periods given in this list are synodic, not sidereal. However, in most cases the difference between these two different measures is not significant.