IOTA/IOTA-ES occultation update for (183) Istria / TYC 5925-01158-1 event on 2012 Oct 19, 03:40 UT Visible from Brazil Summary ------- On 2012 Oct 19 UT, the 35 km diameter asteroid (183) Istria will occult a 8.5 mag star in the constellation Lepus for observers along a path across Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 12.6 mag (the magnitude of the asteroid) for at most 3.7 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: 47 * date and approx. time of event: 2012 Oct 19, 03:33 - 2012 Oct 19, 03:47 UT * geocentric midpoint of event [JD]: 2456219.6534625 * magnitude of target star: 8.5 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 3.7 * Moon: 19 % sunlit, 139° distance * Sun: 113° distance * rough path description: Brazil The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 1.39 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .055 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .028", 67° ) * approx speed of asteroid's shadow [km/s]: 9.2977 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5925-01158-1 by 183 Istria on 2012 Oct 19 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude - 79 4 1 1 32 30 3 33 44 7 111 -67 - 78 7 21 1 17 38 - 80 10 13 1 50 54 - 75 57 35 0 46 43 ... .. .. .. .. .. - 75 40 19 - 0 31 35 3 33 55 11 110 -69 - 75 2 4 - 0 39 32 - 76 20 57 - 0 22 43 - 73 25 14 - 0 58 3 - 78 31 46 0 8 35 - 73 20 47 - 2 11 31 3 34 7 13 110 -70 - 72 49 21 - 2 16 53 - 73 53 24 - 2 5 42 - 71 27 20 - 2 29 45 - 75 31 56 - 1 46 32 - 71 30 9 - 3 40 28 3 34 18 16 110 -70 - 71 2 30 - 3 44 23 - 71 58 34 - 3 36 16 - 69 49 13 - 3 53 52 - 73 22 18 - 3 22 46 - 69 57 2 - 5 2 43 3 34 29 18 110 -70 - 69 31 50 - 5 5 40 - 70 22 47 - 4 59 33 - 68 24 26 - 5 12 50 - 71 37 43 - 4 49 28 - 68 36 0 - 6 20 19 3 34 40 19 109 -70 - 68 12 32 - 6 22 35 - 68 59 54 - 6 17 53 - 67 9 23 - 6 28 2 - 70 8 53 - 6 10 9 - 67 23 59 - 7 34 27 3 34 51 21 109 -70 - 67 1 48 - 7 36 11 - 67 46 31 - 7 32 34 - 66 1 52 - 7 40 19 - 68 51 11 - 7 26 33 - 66 19 1 - 8 45 51 3 35 2 22 108 -69 - 65 57 50 - 8 47 10 - 66 40 30 - 8 44 24 - 65 0 26 - 8 50 14 - 67 41 54 - 8 39 44 - 65 19 46 - 9 55 2 3 35 13 24 108 -69 - 64 59 23 - 9 56 1 - 65 40 25 - 9 53 57 - 64 4 0 - 9 58 13 - 66 39 16 - 9 50 22 - 64 25 17 -11 2 24 3 35 25 25 107 -68 - 64 5 33 -11 3 6 - 64 45 15 -11 1 37 - 63 11 48 -11 4 34 - 65 42 3 -10 58 55 - 63 34 52 -12 8 14 3 35 36 26 107 -67 - 63 15 39 -12 8 41 - 63 54 17 -12 7 41 - 62 23 16 -12 9 31 - 64 49 25 -12 5 44 - 62 47 57 -13 12 43 3 35 47 27 106 -66 - 62 29 10 -13 12 58 - 63 6 55 -13 12 24 - 61 37 55 -13 13 16 - 64 0 40 -13 11 6 - 62 4 7 -14 16 4 3 35 58 28 106 -65 - 61 45 42 -14 16 8 - 62 22 42 -14 15 57 - 60 55 24 -14 15 57 - 63 15 18 -14 15 11 - 61 23 1 -15 18 25 3 36 9 29 105 -64 - 61 4 55 -15 18 19 - 61 41 17 -15 18 27 - 60 15 24 -15 17 43 - 62 32 56 -15 18 11 - 60 44 23 -16 19 53 3 36 20 30 104 -63 - 60 26 33 -16 19 39 - 61 2 23 -16 20 4 - 59 37 42 -16 18 39 - 61 53 14 -16 20 14 - 60 7 59 -17 20 34 3 36 32 31 104 -63 - 59 50 21 -17 20 12 - 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64 47 27 -66 28 25 - 66 17 23 -66 27 48 - 62 45 7 -66 28 11 - 68 25 8 -66 25 44 - 67 38 16 -67 29 11 3 46 11 27 77 -12 - 66 50 28 -67 29 54 - 68 26 31 -67 28 17 - 64 39 49 -67 30 53 - 70 42 59 -67 24 42 - 70 4 46 -68 29 8 3 46 23 26 79 -11 - 69 13 31 -68 30 26 - 70 56 29 -68 27 36 - 66 53 27 -68 32 56 - 73 22 45 -68 22 8 - 72 55 40 -69 27 25 3 46 34 25 81 -10 - 72 0 32 -69 29 28 - 73 51 18 -69 25 6 - 69 29 48 -69 33 53 - 76 28 34 -69 17 15 - 76 15 49 -70 23 11 3 46 45 23 84 -9 - 75 16 19 -70 26 11 - 77 15 49 -70 19 53 - 72 33 34 -70 33 2 - 80 5 20 -70 9 3 - 80 10 55 -71 15 16 3 46 56 22 87 -8 - 79 6 35 -71 19 28 - 81 15 45 -71 10 42 - 76 10 27 -71 29 24 - 84 18 42 -70 56 3 - 84 47 28 -72 1 57 3 47 7 21 92 -6 - 83 37 55 -72 7 43 - 85 57 31 -71 55 46 - 80 27 9 -72 21 36 - 89 14 53 -71 36 11 - 90 12 31 -72 40 49 3 47 18 19 96 -5 - 88 57 29 -72 48 36 - 91 28 0 -72 32 31 - 85 31 13 -73 7 39 - 95 0 20 -72 6 30 - 96 32 46 -73 8 24 3 47 29 17 102 -4 - 95 12 17 -73 18 50 - 97 53 40 -72 57 18 - 91 30 29 -73 44 41 -101 40 59 -72 22 41 -103 53 33 -73 19 35 3 47 41 15 109 -2 -102 27 56 -73 33 38 -105 19 35 -73 4 41 - 98 31 38 -74 8 31 -109 21 44 -72 18 7 -112 17 46 -73 6 34 3 47 52 13 117 -1 -110 47 21 -73 25 43 -113 48 55 -72 46 8 -106 38 23 -74 13 9 -118 8 19 -71 41 18 Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 5925-01158-1 * constellation : Lepus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 38 17.4229 DE: -20 10 33.990 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 8.5 * B mag [mag]: 8.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (183) Istria approx. diameter [km]: 35 approx. diameter ["]: .041 distance from Earth [AU]: 1.17000 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 988 number of rejected observations: 42 time covered by the observations: 1906 Feb 22 - 2012 Oct 03 1 sigma uncertainty ellipse (major, minor, PA): 0.054, 0.017, 63° remarks: * orbital elements for (183) Istria : Mean anomaly = 2.58448725 deg Arg. of pericenter = 264.27865449 deg Long. of node = 141.97141902 deg Inclination = 26.38674844 deg Eccentricity = 0.35172644 Semimajor axis = 2.79114707 AU Perihelion dist = 1.80942684 AU Mag: H = 9.49, G = 0.15 Epoch of elements : MJD 56219.15300000 TDT (2012 Oct 19.153) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 19 183 Istria 3h 41.0m UT 8.5 5 38 17.423-20 10 33.99TYC 5925-01158-1 8.8 12.6 35 3.7 1.170 1.632 -32.03 1.3024 -20.168 121.00 -10.10 3.6831 -0.62090 -0.44399 3.06036 -4.26312 -0.00435 0.00170 2000 0.64987720121010.00000264.278654141.971419 26.3867480.35172644 2.7911471 1.8094268 9.7 5.00.15 RATE 2.1136350 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.028 67 2.39 0.057 0 0-1 0 056208.0020121019_1158-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org