Background (as of 2015-06-20) Object: (436724) 2011 UW158 Approximate Diameter: 330 m - 750 m (1082.68 feet to 2460.63 feet)( Absolute Magnitude: H= 19.5 ) Orbit Type: Amor [PHA] (JPL listed it as an Apollo, MPC as an Amor) On the Sentry Risk Table: NO ( Removed 2011-11-17 08:50 UTC ) On the NEODyS CLOMON2 risk page: NO First Observed on: 2011-10-25 First Observed By: Pan-STARRS 1 (MPC Code F51) (The Discovery M.P.E.C.: MPEC 2011-U90 : 2011 UW158 ) Last Observed: 2015-06-20 Data-Arc Span: 1334 days (3.65 yr) Number Oppositions : 4 Number of Observations Made: 185 Next Close-Approach: 2015-Jul-19, Nominal Distance (AU): 0.016439695228839, (6.398 Lunar Distance (LD)) or 1,528,165.141 miles (2,459,343.401 KM) Near-Earth Object Human Space Flight Accessible Targets Study (NHATS): YES On the Goldstone Asteroid Schedule: YES, Dates: 2015 July 13-26 ( Needs Astrometry: Yes Physical Observations: Yes) On the Arecibo Asteroid Schedule: YES, Dates: 2015 July 12-17 (Request Optical Astrometry: No, Request Optical Lightcurve:Yes, Request Optical Characterization Yes) and 2015 August 29(Request Optical Astrometry: No, Request Optical Lightcurve:No, Request Optical Characterization No) Observing Run of (436724) 2011 UW158 on 2015-06-20 On 2015-06-20 I ran a series of 30 -- 60 Second Luminance BIN2 Images on itelescope.net's (TEL T9 0.32-m f/9.3 Ritchey-Chretien + CCD + f/7.4 focal reducer) at Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62) and did data reduction on four images. Video data: The Near-Earth Object (436724) 2011 UW158 on 2015-06-20 From from Siding Spring Observatory, Coonabarabran, NSW, Australia. (MPC Q62) 30 -- 60 Second Luminance BIN2 Images using itelescope.net's (TEL T9 0.32-m f/9.3 Ritchey-Chretien + CCD + f/7.4 focal reducer) from 2015-06-20 10:00 UTC to 10:43 UTC (c) Steven M. Tilley http://lagniappeobserving.blogspot.com/2015/06/near-earth-object-436724-2011-uw158-on-2015-06-20.html

• published: 21 Jun 2015
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