IOTA/IOTA-ES occultation update for (674) Rachele / UCAC2 16291936 event on 2012 Aug 16, 07:35 UT Visible from New Zealand, Chile, Bolivia, Brazil Summary ------- On 2012 Aug 16 UT, the 106 km diameter asteroid (674) Rachele will occult a 11.4 mag star in the constellation Microscopium for observers along a path across New Zealand, Chile, Bolivia, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 12.6 mag (the magnitude of the asteroid) for at most 8.1 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: UCAC. The event at a glimpse ---------------------- * Rank: 90 * date and approx. time of event: 2012 Aug 16, 07:27 - 2012 Aug 16, 07:43 UT * geocentric midpoint of event [JD]: 2456155.81639167 * magnitude of target star: 11.4 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 8.1 * Moon: 2 % sunlit, 156° distance * Sun: 153° distance * rough path description: New Zealand, Chile, Bolivia, Brazil The occultation path -------------------- * approximate projected width [km]: 107 * 1 sigma uncertainty interval [path widths]: +/- 0.52 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .031", 89° ) * approx speed of asteroid's shadow [km/s]: 13.1476 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 16291936 by 674 Rachele on 2012 Aug 16 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 149 0 0 -25 7 3 7 43 5 21 122 0 -24 32 26 -25 41 44 -23 56 27 -26 17 50 150 0 0 -25 43 10 7 43 2 22 121 -1 -25 8 40 -26 17 42 -24 32 49 -26 53 40 151 0 0 -26 18 39 7 42 58 24 121 -2 -25 44 17 -26 53 4 -25 8 34 -27 28 53 152 0 0 -26 53 31 7 42 54 25 120 -3 -26 19 16 -27 27 47 -25 43 42 -28 3 29 153 0 0 -27 27 45 7 42 51 26 120 -4 -26 53 38 -28 1 53 -26 18 12 -28 37 27 154 0 0 -28 1 21 7 42 47 27 119 -5 -27 27 22 -28 35 21 -26 52 4 -29 10 46 155 0 0 -28 34 19 7 42 43 28 119 -6 -28 0 28 -29 8 11 -27 25 19 -29 43 28 156 0 0 -29 6 38 7 42 39 29 118 -7 -28 32 56 -29 40 23 -27 57 55 -30 15 31 157 0 0 -29 38 19 7 42 34 30 118 -8 -29 4 45 -30 11 56 -28 29 52 -30 46 55 158 0 0 -30 9 22 7 42 30 31 117 -9 -29 35 56 -30 42 50 -29 1 12 -31 17 41 159 0 0 -30 39 47 7 42 26 32 117 -10 -30 6 29 -31 13 7 -29 31 53 -31 47 49 160 0 0 -31 9 33 7 42 21 33 116 -11 -30 36 23 -31 42 45 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7 - 54 0 0 - 9 43 27 7 28 4 20 234 -34 - 9 7 7 -10 19 50 - 8 29 23 -10 57 42 - 53 0 0 - 8 57 47 7 28 0 19 234 -33 - 8 21 25 - 9 34 11 - 7 43 39 -10 12 5 - 52 0 0 - 8 11 56 7 27 57 18 234 -32 - 7 35 34 - 8 48 21 - 6 57 46 - 9 26 17 - 51 0 0 - 7 25 57 7 27 54 16 234 -31 - 6 49 34 - 8 2 23 - 6 11 46 - 8 40 19 - 50 0 0 - 6 39 52 7 27 51 15 234 -30 - 6 3 28 - 7 16 18 - 5 25 39 - 7 54 14 - 49 0 0 - 5 53 41 7 27 48 14 234 -29 - 5 17 17 - 6 30 7 - 4 39 29 - 7 8 4 - 48 0 0 - 5 7 27 7 27 46 13 234 -28 - 4 31 4 - 5 43 53 - 3 53 16 - 6 21 49 - 47 0 0 - 4 21 12 7 27 44 11 233 -26 - 3 44 49 - 4 57 37 - 3 7 2 - 5 35 32 - 46 0 0 - 3 34 57 7 27 42 10 233 -25 - 2 58 36 - 4 11 21 - 2 20 50 - 4 49 15 - 45 0 0 - 2 48 45 7 27 40 9 233 -24 - 2 12 25 - 3 25 7 - 1 34 40 - 4 3 0 - 44 0 0 - 2 2 36 7 27 39 8 233 -23 - 1 26 19 - 2 38 57 - 0 48 36 - 3 16 47 - 43 0 0 - 1 16 34 7 27 37 6 233 -22 - 0 40 18 - 1 52 52 - 0 2 38 - 2 30 40 - 42 0 0 - 0 30 39 7 27 36 5 233 -21 0 5 34 - 1 6 55 0 43 11 - 1 44 40 - 41 0 0 0 15 6 7 27 35 4 233 -20 0 51 16 - 0 21 6 1 28 50 - 0 58 49 - 40 0 0 1 0 40 7 27 35 3 233 -18 1 36 46 0 24 31 2 14 17 - 0 13 8 - 39 0 0 1 46 1 7 27 34 1 233 -17 2 22 3 1 9 56 2 59 30 0 32 21 - 38 0 0 2 31 7 7 27 34 0 233 -16 .. .. .. 1 55 6 .. .. .. 1 17 35 Uncertainty in time = +/- 8 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: UCAC2 16291936 * constellation : Microscopium * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 42 55.4968 DE: -36 41 34.533 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .058, .026 ) * V mag [mag]: 11.4 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (674) Rachele approx. diameter [km]: 106 approx. diameter ["]: .060 distance from Earth [AU]: 2.45100 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 732 number of rejected observations: 123 time covered by the observations: 1901 May 24 - 2012 Jun 23 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.016, 81° remarks: * orbital elements for (674) Rachele : Mean anomaly = 222.06306462 deg Arg. of pericenter = 42.25008123 deg Long. of node = 58.20958725 deg Inclination = 13.51321738 deg Eccentricity = 0.19518892 Semimajor axis = 2.92193773 AU Perihelion dist = 2.35160787 AU Mag: H = 7.35, G = 0.15 Epoch of elements : MJD 56155.31600000 TDT (2012 Aug 16.316) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 16 674 Rachele 7h 35.6m UT 11.4 20 42 55.497-36 41 34.53UCAC2 16291936 0.0 12.6 106 8.1 2.451 -2.184 -4.29 -128.2739 -36.692 67.16 13.57 7.5934 0.01800 -0.10514 -7.32347 -1.19840 0.00146 0.00214 2000 221.0140482012 811.00000 42.250081 58.209587 13.5132170.19518892 2.9219377 2.3516079 7.4 5.00.15 RATE 1.9733200 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.031 89 1.52 0.031 0 0-2-3 056116.0020120816_291936 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 23:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org