Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2011 September - December

Lightcurves for 42 asteroids were obtained at the Palmer Divide Observatory (PDO) from 2011 September to December: 92 Undina, 413 Edburga, 802 Epyaxa, 971 Alsatia, 1987 Kaplan, 3260 Vizbor, 3880 Kaiserman, 4172 Rochefort, 4217 Engelhardt, 4713 Steel, 4898 Nishiizumi, 5384 Changjiangcun, 5426 Sharp, 5427 Jensmartin, 6029 Edithrand, (6382) 1988 EL, 6485 Wendeesther, 6646 Churanta, 7829 Jaroff, (12453) 1996 YY, (16681) 1994 EV7, (20699) 1999 VJ144, (30019) 2000 DD, (32753) 1981 EB14, (46037) 2001 DF33, (57276) 2001 QP139, (59962) 1999 RL234, (63633) 2001 QR84, (71734) 2000 LX9, (84890) 2003 NP9, (96253) 1995 BY1, (105844) 2000 SH160, (106620) 2000 WL124, (114086) 2002 VG36, (114367) 2002 XA89, (134507) 1999 CR142, (138666) 2000 RX96, (178734) 2000 TB2, (203095), (303013) 2003 WC125, and 2000 YA. Two asteroids showed indications of being a binary asteroid. For the Hungaria asteroid 4217 Engelhardt, two, possibly three, potential mutual events (occultations and/or eclipses) were observed. No mutual events were observed for the Phocaea asteroid (46037) 2001 DF33 but a strong secondary period was found in the data with the lightcurve similar to that of a tidallylocked, slightly elongated satellite. New values for absolute magnitude (H) were found for several Hungaria asteroids using either derived or assumed values of G. These H values were compared against those used in the WISE mission to determine diameters and albedos. In all cases where the WISE results featured an unusually high albedo for the asteroid in question, the new value of H resulted in an albedo that was significantly lower and closer to the expected value for type E asteroids, which are likely members of the Hungaria collisional family.