IOTA/IOTA-ES occultation update for (3155) Lee / HIP 93255 event on 2012 Jul 05, 16:07 UT Visible from Australia, Madagascar Summary ------- On 2012 Jul 05 UT, the 12 km diameter asteroid (3155) Lee will occult a 8.1 mag star in the constellation Sagittarius for observers along a path across Australia, Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.4 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 15 * date and approx. time of event: 2012 Jul 05, 15:57 - 2012 Jul 05, 16:16 UT * geocentric midpoint of event [JD]: 2456114.17155 * magnitude of target star: 8.1 * magnitude drop [mag]: 7.4 * estimated maximum duration [s]: 1.1 * Moon: 95 % sunlit, 31° distance * Sun: 168° distance * rough path description: Australia, Madagascar The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 4.55 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .073 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .073", .050", 87° ) * approx speed of asteroid's shadow [km/s]: 11.1189 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 93255 by 3155 Lee on 2012 Jul 5 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 25 0 0 - 5 2 56 16 16 34 1 124 0 - 4 58 58 - 5 6 53 - 4 22 54 - 5 42 54 26 0 0 - 5 43 53 16 16 34 2 124 -1 - 5 39 56 - 5 47 51 - 5 3 58 - 6 23 46 27 0 0 - 6 24 29 16 16 33 4 124 -2 - 6 20 32 - 6 28 25 - 5 44 39 - 7 4 15 28 0 0 - 7 4 41 16 16 32 5 124 -4 - 7 0 45 - 7 8 37 - 6 24 58 - 7 44 21 29 0 0 - 7 44 29 16 16 31 6 124 -5 - 7 40 33 - 7 48 24 - 7 4 52 - 8 24 2 30 0 0 - 8 23 51 16 16 30 7 124 -6 - 8 19 56 - 8 27 45 - 7 44 21 - 9 3 17 31 0 0 - 9 2 46 16 16 28 8 124 -7 - 8 58 52 - 9 6 40 - 8 23 24 - 9 42 6 32 0 0 - 9 41 14 16 16 26 10 124 -8 - 9 37 21 - 9 45 8 - 9 1 59 -10 20 27 33 0 0 -10 19 14 16 16 24 11 123 -9 -10 15 22 -10 23 7 - 9 40 7 -10 58 20 34 0 0 -10 56 45 16 16 22 12 123 -10 -10 52 54 -11 0 37 -10 17 45 -11 35 43 35 0 0 -11 33 47 16 16 19 13 123 -12 -11 29 56 -11 37 37 -10 54 54 -12 12 37 36 0 0 -12 10 17 16 16 17 14 123 -13 -12 6 27 -12 14 7 -11 31 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0 0 5 50 13 15 57 36 9 234 -11 5 54 14 5 46 13 6 30 46 5 9 44 -162 0 0 6 32 54 15 57 35 7 234 -10 6 36 54 6 28 53 7 13 26 5 52 24 -161 0 0 7 15 30 15 57 33 6 234 -9 7 19 31 7 11 30 7 56 3 6 35 1 -160 0 0 7 58 2 15 57 32 5 234 -8 8 2 3 7 54 1 8 38 34 7 17 34 -159 0 0 8 40 27 15 57 31 4 234 -6 8 44 27 8 36 26 9 20 58 7 59 59 -158 0 0 9 22 44 15 57 30 3 234 -5 9 26 44 9 18 43 10 3 13 8 42 17 -157 0 0 10 4 51 15 57 30 1 235 -4 10 8 51 10 0 50 10 45 18 9 24 26 -156 0 0 10 46 46 15 57 30 0 235 -3 10 50 46 10 42 46 .. .. .. 10 6 24 Uncertainty in time = +/- 7 secs Prediction of 2012 Jun 6.0 Data for the target star ------------------------ * name: HIP 93255 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 59 44.6875 DE: -34 28 16.661 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .026, .017 ) * V mag [mag]: 8.1 * B mag [mag]: 9.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3155) Lee approx. diameter [km]: 12 approx. diameter ["]: .011 distance from Earth [AU]: 1.48900 * orbital information: orbit source: Preston date of fit: 2012 Jun 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 972 number of rejected observations: 21 time covered by the observations: 1941 Sep 27 - 2011 Jun 12 1 sigma uncertainty ellipse (major, minor, PA): 0.068, 0.047, 86° remarks: * orbital elements for (3155) Lee : Mean anomaly = 234.62325490 deg Arg. of pericenter = 28.69025266 deg Long. of node = 28.56850932 deg Inclination = 7.20316498 deg Eccentricity = 0.10014446 Semimajor axis = 2.34280455 AU Perihelion dist = 2.10818566 AU Mag: H = 12.23, G = 0.15 Epoch of elements : MJD 56113.67200000 TDT (2012 Jul 05.672) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 5 3155 Lee 16h 7.0m UT 8.1 18 59 44.688-34 28 16.66HIP 93255 9.1 15.5 12 1.1 1.489 -2.959 -5.92 119.1219 -34.470 -60.58 22.70 16.1172 -0.01108 0.06832 -6.19491 -1.00433 -0.00001 0.00110 2000 233.6139962012 7 2.00000 28.690253 28.568509 7.2031650.10014446 2.3428046 2.108185712.2 5.00.15 RATE 2.7485270 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.073 0.050 87 5.55 0.051 0 0-5-1 056084.0020120705__93255 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 06, 02:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org