IOTA/IOTA-ES occultation update for (147) Protogeneia / UCAC2 22545005 event on 2008 Mar 24, 18:59 UT Visible from Tasmania Summary ------- On 2008 Mar 24 UT, the 133 km diameter asteroid (147) Protogeneia will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across Tasmania. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 14.1 mag (the magnitude of the asteroid) for at most 7.7 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: 96 * date and approx. time of event: 2008 Mar 24, 18:53 - 2008 Mar 24, 18:59 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 7.7 * Moon: 92 % sunlit, 58° distance * Sun: 89° distance * rough path description: Tasmania The occultation path -------------------- * approximate projected width [km]: 140 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .025", 89° ) * approx speed of asteroid's shadow [km/s]: 17.2034 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 22545005 by 147 Protogeneia on 2008 Mar 24 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 71 0 0 -21 9 12 18 53 38 0 115 -69 -21 51 14 .. .. .. -22 26 42 .. .. .. 72 0 0 -21 35 8 18 53 38 1 114 -69 -22 17 9 -20 53 17 -22 52 37 -20 18 17 73 0 0 -22 0 58 18 53 38 2 114 -69 -22 42 59 -21 19 8 -23 18 25 -20 44 8 74 0 0 -22 26 41 18 53 39 3 114 -69 -23 8 41 -21 44 52 -23 44 7 -21 9 52 75 0 0 -22 52 17 18 53 39 4 113 -69 -23 34 16 -22 10 29 -24 9 41 -21 35 30 76 0 0 -23 17 45 18 53 40 5 113 -68 -23 59 43 -22 35 58 -24 35 8 -22 1 0 77 0 0 -23 43 4 18 53 40 6 112 -68 -24 25 2 -23 1 19 -25 0 25 -22 26 22 78 0 0 -24 8 15 18 53 41 7 112 -68 -24 50 11 -23 26 31 -25 25 33 -22 51 35 79 0 0 -24 33 16 18 53 42 8 112 -67 -25 15 10 -23 51 33 -25 50 31 -23 16 39 80 0 0 -24 58 7 18 53 43 9 111 -67 -25 39 59 -24 16 26 -26 15 18 -23 41 33 81 0 0 -25 22 46 18 53 44 10 111 -66 -26 4 37 -24 41 7 -26 39 54 -24 6 16 82 0 0 -25 47 15 18 53 46 11 110 -66 -26 29 3 -25 5 38 -27 4 19 -24 30 48 83 0 0 -26 11 32 18 53 47 12 110 -65 -26 53 17 -25 29 57 -27 28 31 -24 55 9 84 0 0 -26 35 36 18 53 49 13 109 -65 -27 17 19 -25 54 3 -27 52 31 -25 19 18 85 0 0 -26 59 27 18 53 50 14 109 -64 -27 41 8 -26 17 57 -28 16 18 -25 43 13 86 0 0 -27 23 5 18 53 52 15 108 -63 -28 4 43 -26 41 38 -28 39 50 -26 6 56 87 0 0 -27 46 29 18 53 54 16 108 -63 -28 28 4 -27 5 4 -29 3 9 -26 30 25 88 0 0 -28 9 39 18 53 56 17 107 -62 -28 51 11 -27 28 17 -29 26 13 -26 53 40 89 0 0 -28 32 33 18 53 58 18 107 -61 -29 14 3 -27 51 15 -29 49 2 -27 16 41 90 0 0 -28 55 13 18 54 0 19 106 -61 -29 36 39 -28 13 58 -30 11 36 -27 39 26 91 0 0 -29 17 37 18 54 2 20 106 -60 -29 59 0 -28 36 25 -30 33 54 -28 1 56 92 0 0 -29 39 45 18 54 4 21 105 -59 -30 21 4 -28 58 36 -30 55 56 -28 24 10 93 0 0 -30 1 37 18 54 6 22 105 -58 -30 42 53 -29 20 31 -31 17 41 -28 46 8 94 0 0 -30 23 12 18 54 9 23 104 -58 -31 4 24 -29 42 10 -31 39 9 -29 7 50 95 0 0 -30 44 29 18 54 11 24 104 -57 -31 25 38 -30 3 31 -32 0 20 -29 29 14 96 0 0 -31 5 30 18 54 14 25 103 -56 -31 46 34 -30 24 36 -32 21 13 -29 50 22 97 0 0 -31 26 13 18 54 17 26 102 -55 -32 7 13 -30 45 22 -32 41 48 -30 11 11 98 0 0 -31 46 37 18 54 20 27 102 -55 -32 27 34 -31 5 51 -33 2 6 -30 31 43 99 0 0 -32 6 44 18 54 22 27 101 -54 -32 47 36 -31 26 1 -33 22 5 -30 51 57 100 0 0 -32 26 31 18 54 25 28 101 -53 -33 7 20 -31 45 53 -33 41 45 -31 11 52 101 0 0 -32 46 0 18 54 28 29 100 -52 -33 26 45 -32 5 26 -34 1 6 -31 31 29 102 0 0 -33 5 10 18 54 31 30 99 -51 -33 45 50 -32 24 40 -34 20 8 -31 50 46 103 0 0 -33 24 1 18 54 35 31 99 -51 -34 4 37 -32 43 35 -34 38 51 -32 9 45 104 0 0 -33 42 32 18 54 38 32 98 -50 -34 23 4 -33 2 11 -34 57 14 -32 28 24 105 0 0 -34 0 44 18 54 41 33 97 -49 -34 41 11 -33 20 27 -35 15 18 -32 46 44 106 0 0 -34 18 36 18 54 44 34 97 -48 -34 58 59 -33 38 23 -35 33 2 -33 4 43 107 0 0 -34 36 8 18 54 48 34 96 -47 -35 16 26 -33 55 59 -35 50 25 -33 22 23 108 0 0 -34 53 20 18 54 51 35 95 -47 -35 33 34 -34 13 16 -36 7 29 -33 39 43 109 0 0 -35 10 11 18 54 55 36 95 -46 -35 50 21 -34 30 12 -36 24 12 -33 56 43 110 0 0 -35 26 43 18 54 58 37 94 -45 -36 6 48 -34 46 47 -36 40 35 -34 13 22 111 0 0 -35 42 53 18 55 2 38 93 -44 -36 22 54 -35 3 2 -36 56 38 -34 29 41 112 0 0 -35 58 43 18 55 6 39 92 -43 -36 38 40 -35 18 57 -37 12 20 -34 45 39 113 0 0 -36 14 13 18 55 9 40 91 -43 -36 54 5 -35 34 31 -37 27 41 -35 1 16 114 0 0 -36 29 22 18 55 13 40 91 -42 -37 9 9 -35 49 44 -37 42 42 -35 16 33 115 0 0 -36 44 10 18 55 17 41 90 -41 -37 23 53 -36 4 36 -37 57 22 -35 31 29 116 0 0 -36 58 37 18 55 21 42 89 -40 -37 38 15 -36 19 7 -38 11 41 -35 46 4 117 0 0 -37 12 43 18 55 25 43 88 -39 -37 52 17 -36 33 18 -38 25 39 -36 0 18 118 0 0 -37 26 28 18 55 28 44 87 -39 -38 5 58 -36 47 7 -38 39 16 -36 14 11 119 0 0 -37 39 52 18 55 32 44 86 -38 -38 19 18 -37 0 35 -38 52 33 -36 27 42 120 0 0 -37 52 55 18 55 36 45 86 -37 -38 32 17 -37 13 43 -39 5 28 -36 40 53 121 0 0 -38 5 37 18 55 40 46 85 -36 -38 44 55 -37 26 29 -39 18 2 -36 53 42 122 0 0 -38 17 58 18 55 45 47 84 -35 -38 57 12 -37 38 54 -39 30 16 -37 6 11 123 0 0 -38 29 58 18 55 49 48 83 -35 -39 9 8 -37 50 57 -39 42 8 -37 18 18 124 0 0 -38 41 37 18 55 53 48 82 -34 -39 20 43 -38 2 40 -39 53 40 -37 30 4 125 0 0 -38 52 55 18 55 57 49 81 -33 -39 31 56 -38 14 2 -40 4 51 -37 41 28 126 0 0 -39 3 51 18 56 1 50 80 -32 -39 42 49 -38 25 2 -40 15 40 -37 52 32 127 0 0 -39 14 27 18 56 5 51 79 -32 -39 53 21 -38 35 41 -40 26 9 -38 3 14 128 0 0 -39 24 41 18 56 10 51 78 -31 -40 3 32 -38 45 59 -40 36 17 -38 13 35 129 0 0 -39 34 34 18 56 14 52 77 -30 -40 13 22 -38 55 56 -40 46 3 -38 23 34 130 0 0 -39 44 7 18 56 18 53 76 -29 -40 22 51 -39 5 31 -40 55 29 -38 33 13 131 0 0 -39 53 18 18 56 23 53 74 -28 -40 31 58 -39 14 46 -41 4 35 -38 42 30 132 0 0 -40 2 8 18 56 27 54 73 -28 -40 40 45 -39 23 39 -41 13 19 -38 51 26 133 0 0 -40 10 37 18 56 31 55 72 -27 -40 49 12 -39 32 12 -41 21 42 -39 0 1 134 0 0 -40 18 46 18 56 36 56 71 -26 -40 57 17 -39 40 23 -41 29 45 -39 8 15 135 0 0 -40 26 33 18 56 40 56 70 -25 -41 5 1 -39 48 13 -41 37 27 -39 16 8 136 0 0 -40 34 0 18 56 45 57 69 -25 -41 12 25 -39 55 43 -41 44 48 -39 23 39 137 0 0 -40 41 5 18 56 49 58 67 -24 -41 19 28 -40 2 51 -41 51 49 -39 30 50 138 0 0 -40 47 50 18 56 54 58 66 -23 -41 26 10 -40 9 38 -41 58 29 -39 37 39 139 0 0 -40 54 14 18 56 58 59 65 -22 -41 32 32 -40 16 4 -42 4 48 -39 44 7 140 0 0 -41 0 17 18 57 3 59 63 -22 -41 38 32 -40 22 10 -42 10 47 -39 50 15 141 0 0 -41 5 59 18 57 7 60 62 -21 -41 44 12 -40 27 54 -42 16 25 -39 56 1 142 0 0 -41 11 21 18 57 12 61 60 -20 -41 49 32 -40 33 18 -42 21 43 -40 1 27 143 0 0 -41 16 22 18 57 17 61 59 -19 -41 54 31 -40 38 21 -42 26 40 -40 6 31 144 0 0 -41 21 2 18 57 21 62 57 -18 -41 59 9 -40 43 3 -42 31 17 -40 11 15 145 0 0 -41 25 22 18 57 26 63 56 -18 -42 3 27 -40 47 24 -42 35 34 -40 15 37 146 0 0 -41 29 20 18 57 31 63 54 -17 -42 7 24 -40 51 25 -42 39 29 -40 19 39 147 0 0 -41 32 59 18 57 35 64 52 -16 -42 11 1 -40 55 4 -42 43 5 -40 23 20 148 0 0 -41 36 16 18 57 40 64 51 -15 -42 14 18 -40 58 23 -42 46 20 -40 26 40 149 0 0 -41 39 13 18 57 45 65 49 -15 -42 17 13 -41 1 22 -42 49 15 -40 29 39 150 0 0 -41 41 50 18 57 49 65 47 -14 -42 19 49 -41 3 59 -42 51 50 -40 32 18 151 0 0 -41 44 6 18 57 54 66 45 -13 -42 22 4 -41 6 16 -42 54 4 -40 34 35 152 0 0 -41 46 1 18 57 59 66 43 -12 -42 23 58 -41 8 12 -42 55 58 -40 36 32 153 0 0 -41 47 36 18 58 4 67 41 -12 -42 25 33 -41 9 48 -42 57 31 -40 38 8 154 0 0 -41 48 50 18 58 8 67 39 -11 -42 26 46 -41 11 3 -42 58 45 -40 39 23 155 0 0 -41 49 44 18 58 13 68 37 -10 -42 27 40 -41 11 57 -42 59 38 -40 40 18 156 0 0 -41 50 18 18 58 18 68 34 -9 -42 28 13 -41 12 30 -43 0 11 -40 40 52 157 0 0 -41 50 30 18 58 23 69 32 -9 -42 28 26 -41 12 43 -43 0 23 -40 41 5 158 0 0 -41 50 23 18 58 28 69 30 -8 -42 28 18 -41 12 35 -43 0 16 -40 40 57 159 0 0 -41 49 54 18 58 33 69 27 -7 -42 27 50 -41 12 7 -42 59 48 -40 40 28 160 0 0 -41 49 5 18 58 37 70 25 -6 -42 27 1 -41 11 18 -42 58 59 -40 39 39 161 0 0 -41 47 56 18 58 42 70 22 -6 -42 25 52 -41 10 8 -42 57 51 -40 38 29 162 0 0 -41 46 26 18 58 47 70 19 -5 -42 24 23 -41 8 37 -42 56 22 -40 36 58 163 0 0 -41 44 36 18 58 52 71 17 -4 -42 22 33 -41 6 46 -42 54 33 -40 35 6 164 0 0 -41 42 25 18 58 57 71 14 -3 -42 20 23 -41 4 34 -42 52 23 -40 32 53 165 0 0 -41 39 53 18 59 2 71 11 -3 -42 17 52 -41 2 2 -42 49 53 -40 30 20 166 0 0 -41 37 1 18 59 7 71 8 -2 -42 15 1 -40 59 8 -42 47 3 -40 27 25 167 0 0 -41 33 48 18 59 12 71 5 -1 -42 11 49 -40 55 54 -42 43 53 -40 24 10 168 0 0 -41 30 14 18 59 17 71 2 0 -42 8 17 -40 52 19 -42 40 22 -40 20 34 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 12.0] Data for the target star ------------------------ * name: UCAC2 22545005 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 24 20.5107 DE: -23 01 29.638 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (147) Protogeneia approx. diameter [km]: 133 approx. diameter ["]: .061 distance from Earth [AU]: 3.00600 * orbital information: orbit source: Preston date of fit: 2008 Mar 12 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 881 number of rejected observations: 117 time covered by the observations: 1903 Aug 05 - 2007 Aug 14 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.011, 86° remarks: * orbital elements for (147) Protogeneia : Mean anomaly = 267.50905767 deg Arg. of pericenter = 104.69879026 deg Long. of node = 248.72489627 deg Inclination = 1.93455638 deg Eccentricity = 0.03326487 Semimajor axis = 3.13865073 AU Perihelion dist = 3.03424391 AU Mag: H = 8.55, G = 0.15 Epoch of elements : MJD 54549.79100000 TDT (2008 Mar 24.791) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 24 147 Protogeneia 18h 59.5m UT 11.9 18 24 20.511-23 1 29.64UCAC2 22545005 0.0 14.1 133 7.7 3.006 2.050 2.33 168.5901 -23.026 -103.35 1.80 18.9917 0.02559 -0.31047 9.67740 0.79579 -0.00583 -0.00024 2000 265.7735902008 315.00000104.698790248.724896 1.9345560.03326487 3.1386507 3.0342439 8.3 5.00.15 RATE 1.7725140 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.025 89 1.42 0.025 0 54537.5020080324_545005 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 12, 23:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org