Could not find any LC data for 138971 (2001 CB21)
Known Periods
Period [hours] Source Notes Date
1 3.303
LCDB (Rev. 2023-February); Warner et al., 2009
REFERENCE LIST:[Galad, A.; Pravec, P.; Kusnirak, P.; Gajdos, S.; et al. (2005) Earth, Moon, and Planets 97, 147-163.], [Colazo, M.; Scotta, D.; Monteleone, B.; Morales, M.; et al. (2022) Minor Planet Bull. 49, 304-306.], [Fornas, G.; Fornas, A.; Mas, V. (2022) Minor Planet Bull. 49, 196-199.], [Pravec, P.; Wolf, M.; Sarounova, L. (2022) http://www.asu.cas.cz/~ppravec/neo.htm], [Warner, B.D.; Stephens, R.D. (2022) Minor Planet Bull. 49, 176-179.]
Feb. 25, 2023
2 3.302
LCDB (Rev. 2021-June); Warner et al., 2009
[Result based on less than full coverage, so that the period may be wrong by 30 percent or so.] REFERENCE LIST:[Galad, A.; Pravec, P.; Kusnirak, P.; Gajdos, S.; et al. (2005) Earth, Moon, and Planets 97, 147-163.]
Dec. 3, 2021