IOTA/IOTA-ES occultation update for (528) Rezia / UCAC2 15857929 event on 2012 Jul 18, 01:47 UT Visible from Europe, Africa, Caribbean Summary ------- On 2012 Jul 18 UT, the 85 km diameter asteroid (528) Rezia will occult a 11.1 mag star in the constellation Sagittarius for observers along a path across Europe, Africa, Caribbean. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 14.1 mag (the magnitude of the asteroid) for at most 6.5 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 Jul 18, 01:42 - 2012 Jul 18, 01:52 UT * geocentric midpoint of event [JD]: 2456126.574575 * magnitude of target star: 11.1 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 6.5 * Moon: 1 % sunlit, 160° distance * Sun: 162° distance * rough path description: Europe, Africa, Caribbean The occultation path -------------------- * approximate projected width [km]: 145 * 1 sigma uncertainty interval [path widths]: +/- 1.38 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .068) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .045", 360° ) * approx speed of asteroid's shadow [km/s]: 13.0178 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 15857929 by 528 Rezia on 2012 Jul 18 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 ' " Longitude Longitude Longitude Longitude 4 36 2 46 0 0 1 42 38 1 207 -18 3 30 46 5 40 26 0 25 33 ... .. .. 3 50 25 45 0 0 1 42 38 2 206 -19 2 45 38 4 54 19 - 0 18 19 ... .. .. 3 3 31 44 0 0 1 42 39 3 206 -21 1 59 8 4 7 0 - 1 3 46 ... .. .. 2 15 20 43 0 0 1 42 40 4 205 -22 1 11 16 3 18 28 - 1 50 49 ... .. .. 1 25 47 42 0 0 1 42 41 5 204 -23 0 21 58 2 28 39 - 2 39 33 ... .. .. 0 34 50 41 0 0 1 42 43 7 204 -24 - 0 28 49 1 37 30 - 3 29 59 ... .. .. - 0 17 35 40 0 0 1 42 45 8 203 -25 - 1 21 8 0 44 59 - 4 22 13 ... .. .. - 1 11 31 39 0 0 1 42 48 9 203 -26 - 2 15 4 - 0 8 59 - 5 16 18 ... .. .. - 2 7 3 38 0 0 1 42 51 10 202 -28 - 3 10 41 - 1 4 29 - 6 12 21 1 43 19 - 3 4 17 37 0 0 1 42 54 11 201 -29 - 4 8 4 - 2 1 35 - 7 10 27 0 46 25 - 4 3 18 36 0 0 1 42 58 13 201 -30 - 5 7 21 - 3 0 22 - 8 10 44 - 0 11 58 - 5 4 12 35 0 0 1 43 2 14 200 -31 - 6 8 37 - 4 0 57 - 9 13 20 - 1 11 54 - 6 7 7 34 0 0 1 43 7 15 199 -33 - 7 12 1 - 5 3 27 - 10 18 25 - 2 13 30 - 7 12 11 33 0 0 1 43 12 16 199 -34 - 8 17 41 - 6 8 0 - 11 26 11 - 3 16 52 - 8 19 35 32 0 0 1 43 18 18 198 -35 - 9 25 49 - 7 14 44 - 12 36 51 - 4 22 8 - 9 29 29 31 0 0 1 43 24 19 197 -36 - 10 36 36 - 8 23 50 - 13 50 40 - 5 29 27 - 10 42 6 30 0 0 1 43 31 20 196 -37 - 11 50 17 - 9 35 31 - 15 7 58 - 6 38 58 - 11 57 42 29 0 0 1 43 38 21 195 -39 - 13 7 9 - 10 49 59 - 16 29 8 - 7 50 52 - 13 16 35 28 0 0 1 43 47 23 194 -40 - 14 27 30 - 12 7 32 - 17 54 37 - 9 5 23 - 14 39 5 27 0 0 1 43 55 24 193 -41 - 15 51 46 - 13 28 28 - 19 25 0 - 10 22 44 - 16 5 39 26 0 0 1 44 5 25 192 -42 - 17 20 25 - 14 53 10 - 21 1 0 - 11 43 14 - 17 36 49 25 0 0 1 44 16 26 191 -44 - 18 54 5 - 16 22 7 - 22 43 35 - 13 7 13 - 19 13 13 24 0 0 1 44 27 27 190 -45 - 20 33 29 - 17 55 52 - 24 33 59 - 14 35 5 - 20 55 42 23 0 0 1 44 39 29 189 -46 - 22 19 40 - 19 35 9 - 26 33 57 - 16 7 20 - 22 45 22 22 0 0 1 44 53 30 187 -47 - 24 13 55 - 21 20 53 - 28 46 2 - 17 44 36 - 24 43 43 21 0 0 1 45 8 31 185 -48 - 26 18 7 - 23 14 18 - 31 14 13 - 19 27 39 - 26 52 52 20 0 0 1 45 25 32 183 -49 - 28 34 58 - 25 17 5 - 34 5 23 - 21 17 30 Latitude Latitude Latitude Latitude - 28 0 0 19 31 1 1 45 34 33 182 -49 20 14 44 18 48 7 22 20 12 16 53 39 - 29 0 0 19 6 21 1 45 42 33 182 -50 19 49 42 18 23 49 21 54 1 16 30 14 - 30 0 0 18 42 52 1 45 50 34 181 -50 19 25 52 18 0 40 21 29 6 16 7 54 - 31 0 0 18 20 33 1 45 58 34 180 -50 19 3 13 17 38 39 21 5 26 15 46 40 - 32 0 0 17 59 22 1 46 6 34 179 -51 18 41 43 17 17 46 20 42 59 15 26 30 - 33 0 0 17 39 19 1 46 14 35 178 -51 18 21 23 16 57 59 20 21 46 15 7 25 - 34 0 0 17 20 23 1 46 22 35 177 -51 18 2 11 16 39 19 20 1 44 14 49 23 - 35 0 0 17 2 34 1 46 30 35 176 -51 17 44 7 16 21 44 19 42 54 14 32 24 - 36 0 0 16 45 52 1 46 38 35 175 -51 17 27 11 16 5 14 19 25 15 14 16 28 - 37 0 0 16 30 15 1 46 46 36 174 -51 17 11 21 15 49 50 19 8 46 14 1 34 - 38 0 0 16 15 43 1 46 55 36 173 -51 16 56 37 15 35 29 18 53 26 13 47 42 - 39 0 0 16 2 16 1 47 3 36 172 -51 16 42 59 15 22 12 18 39 14 13 34 51 - 40 0 0 15 49 53 1 47 11 36 171 -51 16 30 27 15 9 59 18 26 11 13 23 2 - 41 0 0 15 38 34 1 47 19 36 170 -50 16 18 59 14 58 49 18 14 16 13 12 13 - 42 0 0 15 28 19 1 47 27 36 169 -50 16 8 36 14 48 42 18 3 28 13 2 25 - 43 0 0 15 19 8 1 47 35 36 168 -50 15 59 17 14 39 37 17 53 48 12 53 38 - 44 0 0 15 10 59 1 47 43 36 167 -50 15 51 2 14 31 34 17 45 13 12 45 50 - 45 0 0 15 3 53 1 47 51 36 167 -49 15 43 51 14 24 34 17 37 46 12 39 3 - 46 0 0 14 57 50 1 47 59 36 166 -49 15 37 43 14 18 35 17 31 24 12 33 15 - 47 0 0 14 52 49 1 48 7 35 165 -48 15 32 39 14 13 38 17 26 9 12 28 27 - 48 0 0 14 48 51 1 48 15 35 164 -48 15 28 38 14 9 42 17 21 59 12 24 38 - 49 0 0 14 45 55 1 48 23 35 163 -48 15 25 40 14 6 48 17 18 55 12 21 49 - 50 0 0 14 44 2 1 48 31 35 162 -47 15 23 45 14 4 56 17 16 56 12 20 0 - 51 0 0 14 43 10 1 48 38 34 161 -47 15 22 53 14 4 5 17 16 3 12 19 9 - 52 0 0 14 43 21 1 48 46 34 160 -46 15 23 5 14 4 15 17 16 16 12 19 19 - 53 0 0 14 44 34 1 48 54 34 160 -45 15 24 19 14 5 27 17 17 35 12 20 28 - 54 0 0 14 46 50 1 49 1 33 159 -45 15 26 37 14 7 41 17 19 59 12 22 36 - 55 0 0 14 50 8 1 49 9 33 158 -44 15 29 58 14 10 56 17 23 29 12 25 44 - 56 0 0 14 54 29 1 49 16 33 157 -43 15 34 22 14 15 13 17 28 5 12 29 52 - 57 0 0 14 59 52 1 49 24 32 156 -43 15 39 51 14 20 32 17 33 48 12 35 0 - 58 0 0 15 6 19 1 49 31 32 156 -42 15 46 23 14 26 54 17 40 37 12 41 8 - 59 0 0 15 13 49 1 49 38 31 155 -41 15 54 0 14 34 18 17 48 33 12 48 16 - 60 0 0 15 22 23 1 49 45 31 154 -41 16 2 41 14 42 44 17 57 37 12 56 25 - 61 0 0 15 32 1 1 49 52 30 153 -40 16 12 27 14 52 14 18 7 48 13 5 35 - 62 0 0 15 42 43 1 49 59 30 153 -39 16 23 18 15 2 48 18 19 7 13 15 47 - 63 0 0 15 54 30 1 50 6 29 152 -38 16 35 15 15 14 25 18 31 36 13 27 0 - 64 0 0 16 7 22 1 50 13 28 151 -37 16 48 19 15 27 7 18 45 13 13 39 15 - 65 0 0 16 21 20 1 50 19 28 151 -37 17 2 29 15 40 53 19 0 0 13 52 32 - 66 0 0 16 36 24 1 50 26 27 150 -36 17 17 46 15 55 45 19 15 58 14 6 52 - 67 0 0 16 52 36 1 50 32 26 149 -35 17 34 12 16 11 43 19 33 7 14 22 16 - 68 0 0 17 9 54 1 50 38 26 149 -34 17 51 46 16 28 47 19 51 28 14 38 43 - 69 0 0 17 28 21 1 50 44 25 148 -33 18 10 29 16 46 58 20 11 2 14 56 15 - 70 0 0 17 47 57 1 50 50 24 148 -32 18 30 22 17 6 17 20 31 50 15 14 52 - 71 0 0 18 8 42 1 50 56 23 147 -31 18 51 26 17 26 44 20 53 52 15 34 35 - 72 0 0 18 30 37 1 51 2 22 147 -30 19 13 42 17 48 21 21 17 10 15 55 23 - 73 0 0 18 53 44 1 51 7 22 146 -29 19 37 10 18 11 7 21 41 45 16 17 19 - 74 0 0 19 18 3 1 51 12 21 146 -28 20 1 52 18 35 4 22 7 38 16 40 22 - 75 0 0 19 43 35 1 51 17 20 145 -27 20 27 48 19 0 13 22 34 51 17 4 34 - 76 0 0 20 10 21 1 51 22 19 145 -26 20 55 0 19 26 35 23 3 23 17 29 54 - 77 0 0 20 38 22 1 51 27 18 144 -25 21 23 29 19 54 10 23 33 18 17 56 25 - 78 0 0 21 7 39 1 51 32 17 144 -24 21 53 15 20 22 59 24 4 36 18 24 6 - 79 0 0 21 38 13 1 51 36 16 143 -23 22 24 21 20 53 4 24 37 20 18 52 59 - 80 0 0 22 10 6 1 51 40 15 143 -22 22 56 46 21 24 26 25 11 30 19 23 5 - 81 0 0 22 43 19 1 51 44 14 142 -21 23 30 34 21 57 6 25 47 9 19 54 24 - 82 0 0 23 17 53 1 51 48 13 142 -20 24 5 45 22 31 5 26 24 18 20 26 58 - 83 0 0 23 53 49 1 51 51 12 141 -19 24 42 21 23 6 25 27 3 0 21 0 47 - 84 0 0 24 31 10 1 51 54 11 141 -18 25 20 24 23 43 6 27 43 17 21 35 53 - 85 0 0 25 9 56 1 51 57 10 140 -17 25 59 54 24 21 11 28 25 12 22 12 16 - 86 0 0 25 50 9 1 52 0 9 140 -16 26 40 55 25 0 40 29 8 47 22 49 58 - 87 0 0 26 31 51 1 52 2 8 139 -15 27 23 28 25 41 35 29 54 4 23 29 1 - 88 0 0 27 15 4 1 52 4 7 139 -13 28 7 35 26 23 58 30 41 8 .. .. .. - 89 0 0 27 59 50 1 52 6 6 138 -12 28 53 18 27 7 51 31 30 0 .. .. .. - 90 0 0 28 46 10 1 52 8 4 138 -11 29 40 40 27 53 15 32 20 46 .. .. .. - 91 0 0 29 34 8 1 52 9 3 137 -10 30 29 43 28 40 13 33 13 30 .. .. .. - 92 0 0 30 23 44 1 52 10 2 137 -9 31 20 30 29 28 45 .. .. .. .. .. .. - 93 0 0 31 15 3 1 52 10 1 136 -8 32 13 4 30 18 55 .. .. .. .. .. .. Uncertainty in time = +/- 9 secs Prediction of 2012 Jun 21.0 Data for the target star ------------------------ * name: UCAC2 15857929 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 27 24.8532 DE: -37 46 57.295 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .034, .066 ) * V mag [mag]: 11.1 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (528) Rezia approx. diameter [km]: 85 approx. diameter ["]: .049 distance from Earth [AU]: 2.41200 * orbital information: orbit source: Preston date of fit: 2012 Jun 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1080 number of rejected observations: 48 time covered by the observations: 1904 Mar 20 - 2012 Jun 09 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.018, 89° remarks: * orbital elements for (528) Rezia : Mean anomaly = 273.35114055 deg Arg. of pericenter = 329.89988404 deg Long. of node = 49.75664273 deg Inclination = 12.67798181 deg Eccentricity = 0.01930458 Semimajor axis = 3.39718826 AU Perihelion dist = 3.33160699 AU Mag: H = 8.94, G = 0.15 Epoch of elements : MJD 56126.07500000 TDT (2012 Jul 18.075) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 18 528 Rezia 1h 47.4m UT 11.1 19 27 24.853-37 46 57.30UCAC2 15857929 0.0 14.1 85 6.5 2.412 -2.206 -5.81 -31.2749 -37.780 154.72 20.97 1.7898 -0.17535 0.79073 -7.17262 -1.59408 0.00053 0.00163 2000 272.3948922012 712.00000329.899884 49.756643 12.6779820.01930458 3.3971883 3.3316070 9.1 5.00.15 RATE 1.5740720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.045 360 2.38 0.067 0 0 2 5 056099.0020120718_857929 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 20, 23:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org