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
68 ( 279208 ) 2009 UQ 35 499.6 0.46 2 MBA ( inner ) S 1.01 17.33 LCDB · List
69 79316 Huangshan 493 0.62 2+ Hungaria E 2.54 14.90 LCDB · List
70 1220 Crocus 491.4 1.00 3 Eos S 15.79 11.76 LCDB · List
71 1256 Normannia 488.1 0.39 2 Hilda D 69.02 10.02 LCDB · List
72 ( 6840 ) 1995 WW 5 482.3 0.46 2 Nysa S 3.12 14.84 LCDB · List
73 2696 Magion 480 0.31 2 Phocaea S 10.06 12.20 LCDB · List
74 5171 Augustesen 480 0.80 3 Vestian S 6.50 13.30 LCDB · List
75 19204 Joshuatree 480 0.95 2+ Phocaea S 4.39 14.00 LCDB · List
76 20862 Jenngoedhart 479.3 1.08 2 Flora S 3.59 14.39 LCDB · List
77 2759 Idomeneus 479 0.27 3− Jupiter trojan C 60.90 10.00 LCDB · List
78 ( 215442 ) 2002 MQ 3 473 0.38 3 NEO S 0.59 18.50 LCDB · List
79 ( 23123 ) 2000 AU 57 467.3 0.57 2 Jupiter trojan C 23.00 11.92 LCDB · List
80 ( 327749 ) 2006 TA 69 463.7 0.83 2 Flora S 0.86 17.50 LCDB · List
81 6141 Durda 460 0.50 2+ Hungaria E 3.35 14.30 LCDB · List
82 6183 Viscome 453 0.90 3− Mars crosser S 5.41 13.70 LCDB · List
83 2013 US 3 450 1.20 2 NEO S 0.16 21.30 LCDB · MPC
84 ( 93955 ) 2000 WT 183 449.5 0.62 2 MBA ( outer ) C 5.80 14.91 LCDB · List
85 ( 66092 ) 1998 SD 448 0.42 2 Hungaria E 3.06 14.50 LCDB · List
86 ( 98055 ) 2000 RR 38 447.6 0.40 2 MBA ( inner ) S 2.36 15.50 LCDB · List
87 ( 36103 ) 1999 RL 116 446.5 0.39 2 MBA ( outer ) C 7.58 14.33 LCDB · List
Periods of 400+ 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.