IOTA/IOTA-ES occultation update for (183) Istria / HIP 58179 event on 2009 Jan 08, 19:46 UT Visible from Summary ------- On 2009 Jan 08 UT, the 35 km diameter asteroid (183) Istria will occult a 8.9 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.8 mag to 14.7 mag (the magnitude of the asteroid) for at most 3.4 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: 43 * date and approx. time of event: 2009 Jan 08, 19:38 - 2009 Jan 08, 19:55 UT * magnitude of target star: 8.9 * magnitude drop [mag]: 5.8 * estimated maximum duration [s]: 3.4 * Moon: 92 % sunlit, 98° distance * Sun: 113° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 1.52 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .024", 91° ) * approx speed of asteroid's shadow [km/s]: 10.4505 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 58179 by 183 Istria on 2009 Jan 8 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 62 20 5 -27 29 48 19 38 46 10 74 -40 61 43 10 -27 31 12 62 55 6 -27 28 44 59 34 55 -27 38 20 64 32 26 -27 27 9 67 8 56 -25 24 29 19 38 59 15 72 -43 66 43 38 -25 23 52 67 33 37 -25 25 13 65 22 32 -25 22 46 68 45 25 -25 28 5 70 31 54 -23 35 29 19 39 11 18 70 -44 70 10 58 -23 34 7 70 52 29 -23 36 55 69 5 11 -23 30 22 71 53 15 -23 41 40 73 13 6 -21 54 53 19 39 24 21 70 -46 72 54 35 -21 53 6 73 31 23 -21 56 43 71 56 54 -21 47 59 74 25 43 -22 2 31 75 28 18 -20 19 47 19 39 37 24 69 -47 75 11 22 -20 17 45 75 45 5 -20 21 52 74 18 50 -20 11 46 76 35 8 -20 28 22 77 25 23 -18 48 43 19 39 50 26 69 -48 77 9 34 -18 46 30 77 41 5 -18 50 57 76 20 38 -18 39 56 78 28 3 -18 57 57 79 8 55 -17 20 47 19 40 3 28 68 -49 78 53 56 -17 18 26 79 23 48 -17 23 9 78 7 41 -17 11 26 80 8 26 -17 30 30 80 41 51 -15 55 23 19 40 16 30 68 -50 80 27 31 -15 52 56 80 56 6 -15 57 51 79 43 21 -15 45 37 81 38 54 -16 5 29 82 6 14 -14 32 7 19 40 28 32 69 -50 81 52 24 -14 29 35 82 19 58 -14 34 40 81 9 54 -14 22 1 83 1 17 -14 42 31 83 23 31 -13 10 39 19 40 41 33 69 -51 83 10 7 -13 8 4 83 36 50 -13 13 16 82 28 58 -13 0 17 84 16 56 -13 21 18 84 34 50 -11 50 46 19 40 54 35 69 -52 84 21 48 -11 48 7 84 47 48 -11 53 25 83 41 46 -11 40 10 85 26 53 -12 1 36 85 41 2 -10 32 14 19 41 7 37 69 -52 85 28 17 -10 29 33 85 53 42 -10 34 57 84 49 12 -10 21 27 86 31 55 -10 43 15 86 42 47 - 9 14 55 19 41 20 38 70 -53 86 30 18 - 9 12 11 86 55 12 - 9 17 40 85 52 0 - 9 3 58 87 32 41 - 9 26 5 87 40 38 - 7 58 40 19 41 33 39 70 -53 87 28 22 - 7 55 54 87 52 51 - 8 1 27 86 50 46 - 7 47 35 88 29 42 - 8 9 58 88 35 2 - 6 43 22 19 41 45 41 71 -54 88 22 58 - 6 40 35 88 47 4 - 6 46 11 87 45 57 - 6 32 10 89 23 22 - 6 54 47 89 26 22 - 5 28 56 19 41 58 42 72 -54 89 14 27 - 5 26 7 89 38 15 - 5 31 46 88 37 57 - 5 17 37 90 14 5 - 5 40 27 90 14 57 - 4 15 16 19 42 11 43 72 -55 90 3 10 - 4 12 25 90 26 41 - 4 18 7 89 27 6 - 4 3 50 91 2 6 - 4 26 52 91 1 1 - 3 2 17 19 42 24 44 73 -55 90 49 22 - 2 59 25 91 12 38 - 3 5 9 90 13 41 - 2 50 45 91 47 43 - 3 13 58 91 44 50 - 1 49 55 19 42 37 45 74 -55 91 33 17 - 1 47 2 91 56 21 - 1 52 49 90 57 55 - 1 38 18 92 31 7 - 2 1 41 92 26 34 - 0 38 7 19 42 50 46 75 -56 92 15 6 - 0 35 12 92 38 0 - 0 41 2 91 40 2 - 0 26 25 93 12 31 - 0 49 58 93 6 25 0 33 12 19 43 2 47 76 -56 92 55 2 0 36 8 93 17 46 0 30 16 92 20 11 0 44 58 93 52 4 0 21 16 93 44 31 1 44 4 19 43 15 48 77 -56 93 33 12 1 47 1 93 55 48 1 41 6 92 58 33 1 55 55 94 29 55 1 32 4 94 21 0 2 54 32 19 43 28 49 78 -56 94 9 44 2 57 30 94 32 15 2 51 33 93 35 15 3 6 27 95 6 12 2 42 27 94 56 0 4 4 38 19 43 41 50 80 -56 94 44 46 4 7 37 95 7 11 4 1 39 94 10 24 4 16 39 95 41 2 3 52 30 95 29 35 5 14 27 19 43 54 51 81 -57 95 18 23 5 17 27 95 40 45 5 11 26 94 44 8 5 26 31 96 14 30 5 2 14 96 1 53 6 23 59 19 44 7 52 82 -57 95 50 43 6 27 0 96 13 2 6 20 57 95 16 32 6 36 8 96 46 43 6 11 42 96 32 58 7 33 18 19 44 19 52 84 -57 96 21 48 7 36 20 96 44 6 7 30 15 95 47 41 7 45 31 97 17 44 7 20 57 97 2 55 8 42 25 19 44 32 53 85 -57 96 51 45 8 45 28 97 14 2 8 39 21 96 17 39 8 54 43 97 47 39 8 29 59 97 31 46 9 51 23 19 44 45 54 87 -57 97 20 37 9 54 27 97 42 54 9 48 18 96 46 30 10 3 45 98 16 32 9 38 53 97 59 37 11 0 13 19 44 58 54 88 -57 97 48 27 11 3 19 98 10 45 10 57 7 97 14 19 11 12 41 98 44 25 10 47 39 98 26 31 12 8 59 19 45 11 55 90 -57 98 15 20 12 12 5 98 37 40 12 5 51 97 41 8 12 21 31 99 11 22 11 56 19 98 52 29 13 17 41 19 45 24 55 92 -57 98 41 17 13 20 49 99 3 40 13 14 32 98 7 1 13 30 17 99 37 26 13 4 57 99 17 36 14 26 21 19 45 37 56 94 -57 99 6 21 14 29 30 99 28 48 14 23 12 98 32 0 14 39 3 100 2 40 14 13 32 99 41 52 15 35 2 19 45 49 56 95 -57 99 30 36 15 38 13 99 53 7 15 31 51 98 56 7 15 47 49 100 27 6 15 22 8 100 5 22 16 43 46 19 46 2 56 97 -57 99 54 2 16 46 58 100 16 39 16 40 34 99 19 25 16 56 38 100 50 47 16 30 47 100 28 5 17 52 34 19 46 15 56 99 -57 100 16 43 17 55 47 100 39 26 17 49 20 99 41 56 18 5 32 101 13 43 17 39 29 100 50 5 19 1 28 19 46 28 57 101 -56 100 38 39 19 4 43 101 1 29 18 58 13 100 3 41 19 14 31 101 35 57 18 48 18 101 11 22 20 10 30 19 46 41 57 103 -56 100 59 52 20 13 46 101 22 50 20 7 14 100 24 41 20 23 40 101 57 30 19 57 14 101 31 58 21 19 43 19 46 54 57 105 -56 101 20 23 21 23 0 101 43 31 21 16 25 100 44 58 21 32 58 102 18 25 21 6 20 101 51 54 22 29 7 19 47 6 57 107 -56 101 40 14 22 32 26 102 3 32 22 25 47 101 4 34 22 42 29 102 38 41 22 15 38 102 11 11 23 38 46 19 47 19 57 109 -56 101 59 25 23 42 6 102 22 54 23 35 24 101 23 28 23 52 14 102 58 20 23 25 10 102 29 50 24 48 40 19 47 32 57 111 -55 102 17 58 24 52 3 102 41 39 24 45 17 101 41 42 25 2 16 103 17 23 24 34 58 102 47 51 25 58 53 19 47 45 57 113 -55 102 35 52 26 2 17 102 59 47 25 55 28 101 59 15 26 12 36 103 35 50 25 45 3 103 5 14 27 9 26 19 47 58 56 115 -55 102 53 9 27 12 53 103 17 18 27 6 0 102 16 9 27 23 17 103 53 43 26 55 29 103 22 1 28 20 22 19 48 11 56 117 -55 103 9 48 28 23 51 103 34 12 28 16 54 102 32 24 28 34 21 104 11 1 28 6 17 103 38 11 29 31 44 19 48 23 56 119 -54 103 25 49 29 35 14 103 50 31 29 28 13 102 47 58 29 45 51 104 27 45 29 17 30 103 53 44 30 43 32 19 48 36 55 121 -54 103 41 12 30 47 5 104 6 12 30 39 59 103 2 53 30 57 49 104 43 54 30 29 9 104 8 39 31 55 52 19 48 49 55 123 -54 103 55 57 31 59 26 104 21 17 31 52 16 103 17 7 32 10 17 104 59 29 31 41 19 104 22 56 33 8 44 19 49 2 55 124 -53 104 10 3 33 12 21 104 35 45 33 5 6 103 30 39 33 23 19 105 14 29 32 54 1 104 36 33 34 22 12 19 49 15 54 126 -53 104 23 29 34 25 52 104 49 35 34 18 31 103 43 28 34 36 57 105 28 53 34 7 19 104 49 31 35 36 19 19 49 28 54 128 -52 104 36 14 35 40 1 105 2 45 35 32 36 103 55 33 35 51 15 105 42 41 35 21 15 105 1 46 36 51 9 19 49 40 53 129 -52 104 48 15 36 54 54 105 15 14 36 47 23 104 6 52 37 6 17 105 55 51 36 35 53 105 13 17 38 6 44 19 49 53 52 131 -51 104 59 31 38 10 33 105 27 0 38 2 55 104 17 21 38 22 5 106 8 22 37 51 17 105 24 2 39 23 10 19 50 6 52 132 -51 105 10 0 39 27 1 105 38 1 39 19 18 104 26 59 39 38 43 106 20 12 39 7 29 105 33 57 40 40 30 19 50 19 51 134 -51 105 19 37 40 44 25 105 48 14 40 36 34 104 35 41 40 56 16 106 31 17 40 24 35 105 42 59 41 58 48 19 50 32 50 135 -50 105 28 20 42 2 47 105 57 35 41 54 49 104 43 23 42 14 49 106 41 36 41 42 39 105 51 4 43 18 10 19 50 45 49 137 -50 105 36 2 43 22 13 106 6 1 43 14 7 104 49 59 43 34 27 106 51 5 43 1 46 105 58 4 44 38 41 19 50 57 48 138 -49 105 42 40 44 42 48 106 13 25 44 34 34 104 55 23 44 55 15 106 59 37 44 22 0 106 3 55 46 0 28 19 51 10 47 139 -48 105 48 4 46 4 39 106 19 41 45 56 16 104 59 26 46 17 19 107 7 10 45 43 29 106 8 26 47 23 36 19 51 23 46 140 -48 105 52 7 47 27 52 106 24 41 47 19 20 105 2 0 47 40 46 107 13 34 47 6 18 106 11 29 48 48 14 19 51 36 45 141 -47 105 54 38 48 52 35 106 28 15 48 43 53 105 2 51 49 5 44 107 18 42 48 30 36 106 12 50 50 14 30 19 51 49 44 142 -47 105 55 23 50 18 56 106 30 11 50 10 3 105 1 45 50 32 22 107 22 22 49 56 29 106 12 13 51 42 33 19 52 2 43 143 -46 105 54 6 51 47 5 106 30 14 51 38 1 104 58 22 52 0 48 107 24 23 51 24 9 106 9 19 53 12 34 19 52 14 42 144 -45 105 50 26 53 17 13 106 28 5 53 7 56 104 52 19 53 31 15 107 24 26 52 53 44 106 3 41 54 44 46 19 52 27 40 145 -45 105 43 56 54 49 31 106 23 18 54 40 0 104 43 6 55 3 54 107 22 10 54 25 28 105 54 45 56 19 23 19 52 40 39 145 -44 105 34 1 56 24 15 106 15 22 56 14 29 104 30 2 56 39 0 107 17 7 55 59 33 105 41 49 57 56 40 19 52 53 38 146 -43 105 19 54 58 1 41 106 3 34 57 51 39 104 12 14 58 16 51 107 8 42 57 36 18 105 23 51 59 36 59 19 53 6 36 146 -42 105 0 34 59 42 9 105 46 57 59 31 49 103 48 33 59 57 45 106 56 3 59 16 0 104 59 32 61 20 42 19 53 19 35 147 -41 104 34 35 61 26 2 105 24 15 61 15 22 103 17 19 61 42 6 106 38 6 60 59 3 104 26 54 63 8 17 19 53 31 33 147 -41 103 59 56 63 13 47 104 53 37 63 2 46 102 36 15 63 30 23 106 13 14 62 45 54 103 43 12 65 0 18 19 53 44 31 147 -40 103 13 42 65 6 0 104 12 23 64 54 35 101 41 55 65 23 9 105 39 11 64 37 6 102 44 11 66 57 26 19 53 57 30 146 -39 102 11 24 67 3 20 103 16 33 66 51 30 100 29 10 67 21 5 104 52 33 66 33 20 101 23 7 69 0 32 19 54 10 28 145 -38 100 45 58 69 6 39 101 59 44 68 54 23 98 49 39 69 25 1 103 47 55 68 35 28 99 28 37 71 10 38 19 54 23 25 144 -37 98 45 20 71 16 57 100 11 10 71 4 15 96 29 7 71 35 52 102 16 18 70 44 35 96 39 55 73 28 56 19 54 36 23 142 -35 95 47 27 73 35 25 97 31 21 73 22 22 93 1 8 73 54 38 100 1 31 73 2 0 92 14 51 75 56 35 19 54 48 20 138 -34 91 7 18 76 3 2 93 20 44 75 50 0 87 31 5 76 21 46 96 31 22 75 29 17 84 34 51 78 33 18 19 55 1 17 131 -33 82 59 16 78 39 3 86 7 30 78 27 18 77 49 30 78 54 35 90 32 5 78 7 36 69 5 45 81 9 49 19 55 14 14 116 -31 66 30 25 81 12 4 71 35 42 81 6 49 58 4 48 81 13 33 78 39 14 80 53 49 32 58 45 82 36 6 19 55 27 9 80 -28 28 41 31 82 20 52 37 12 55 82 48 28 15 11 7 81 10 40 49 43 6 83 11 42 Uncertainty in time = +/- 5 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 58179 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 55 56.6455 DE: +09 50 49.541 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .026, .018 ) * V mag [mag]: 8.9 * B mag [mag]: 8.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (183) Istria approx. diameter [km]: 35 approx. diameter ["]: .021 distance from Earth [AU]: 2.27800 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 781 number of rejected observations: 42 time covered by the observations: 1906 Feb 22 - 2008 Jan 10 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.016, 92° remarks: * orbital elements for (183) Istria : Mean anomaly = 71.12177976 deg Arg. of pericenter = 264.23151911 deg Long. of node = 141.99938510 deg Inclination = 26.38382203 deg Eccentricity = 0.35039684 Semimajor axis = 2.79300156 AU Perihelion dist = 1.81434265 AU Mag: H = 9.46, G = 0.15 Epoch of elements : MJD 54839.82400000 TDT (2009 Jan 08.824) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 8 183 Istria 19h 47.1m UT 8.9 11 55 56.646 9 50 49.54HIP 58179 8.9 14.7 35 3.4 2.278 0.679 20.45 133.7173 9.842 -115.04 -22.14 19.7851 -0.48951 0.24114 2.60273 5.29329 -0.00512 0.00186 2000 69.04741320081230.00000264.231519141.999385 26.3838220.35039684 2.7930016 1.8143426 9.7 5.00.15 RATE 2.1115300 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.024 91 2.52 0.032 0 54786.5020090108__58179 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 16:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org