Radar-targeted NEOs

This page gives details of radar-targeted NEOs (those scheduled for Arecibo and/or Goldstone radar observations) that have been studied using the LCOGT Network and have had rotation periods determined.

2002 NV16

Period of 0.90672 hours found from LSC (Chile; W85) data on 2013/06/13 and 15 UTC.

2013 QR1

Observations with the 1-m telescope from the LCOGT Node at McDonald Observatory (V37) on 2013-08-21 UTC consisting of two 40 minute blocks of observations separated by 90 minutes, in PanSTARRS-w of 16.0 and 15.5 sec exposures (plus 14sec deadtime) show a strong signal in a Lomb-Scargle periodogram at ~512.12 cycles/day or a period of approx. 5.62 minutes (assuming two maxima per cycle and doubling the period). The light curve amplitude is harder to judge given the S/N of ~10-20 but I would estimate it at +/-0.3 mag. This rotation rate seems incompatible with the estimated diameter of ~170m based on the H magnitude, but would probably be OK if the diameter was nearer the ~100m end of the normal factor-of-2 on H-based diameters.

Lomb-Scargle periodogram for 2013 QR1

Unclipped, phased PanSTARRS-w band light curve of 2013 QR1 taken with the 1-m at McDonald Observatory. The data has been phased on twice the period obtained from the periodgram (P=5.62368 minutes)

Further observations were taken on 2013-08-22 UTC also from the McDonald Node which confirms the detection of variability and refines the period.  Analysis of the combined data set produces a peak at 512.9693676 cycles/day or a period of 5.6144 minutes (once doubled)

Lomb-Scargle periodogram of the combined 2013-08-21 and -22 data sets.

Phasing the 2013-08-22 data set on the new period produces the following phase light curve: