IOTA/IOTA-ES occultation update for (326) Tamara / UCAC4 272-150358 event on 2023 Mar 12, 03:15 UT Visible from Africa Summary ------- On 2023 Mar 12 UT, the 93.1 km diameter asteroid (326) Tamara will occult a 10.2 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.26 mag to 13.38 mag (the magnitude of the asteroid) for at most 3.210 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2023 Mar 12, 03:12 - 2023 Mar 12, 03:19 * geocentric midpoint of event [JD]: 2460015.63601588 * magnitude of target star: 10.18 * magnitude drop [mag]: 3.26 * estimated maximum duration [s]: 3.210 * Moon: 80 % sunlit, 48° distance * Sun: 79° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 103°) * approx speed of asteroid's shadow [km/s]: 29.0362 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 272-150358 by 326 Tamara on 2023 Mar 12 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 29 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 8 21 55 .. .. .. .... - 28 0 0 8 12 50 3 12 17.4 1 126 -72 7 40 31 8 45 4 7 37 51 8 47 43 .... - 27 0 0 7 28 11 3 12 17.5 2 126 -71 6 55 41 8 0 35 6 53 0 8 3 16 0.25 - 26 0 0 6 42 46 3 12 17.8 3 127 -70 6 10 5 7 15 21 6 7 23 7 18 2 0.24 - 25 0 0 5 56 36 3 12 18.1 5 127 -69 5 23 44 6 29 22 5 21 1 6 32 4 0.24 - 24 0 0 5 9 41 3 12 18.6 6 127 -68 4 36 39 5 42 38 4 33 55 5 45 21 0.24 - 23 0 0 4 22 4 3 12 19.1 7 127 -67 3 48 51 4 55 11 3 46 6 4 57 55 0.24 - 22 0 0 3 33 44 3 12 19.8 8 127 -66 3 0 21 4 7 2 2 57 35 4 9 47 0.24 - 21 0 0 2 44 44 3 12 20.6 10 127 -65 2 11 11 3 18 12 2 8 24 3 20 58 0.24 - 20 0 0 1 55 5 3 12 21.5 11 127 -64 1 21 21 2 28 43 1 18 34 2 31 29 0.24 - 19 0 0 1 4 48 3 12 22.6 12 127 -63 0 30 54 1 38 36 0 28 6 1 41 23 0.24 - 18 0 0 0 13 55 3 12 23.7 14 127 -62 - 0 20 8 0 47 52 - 0 22 58 0 50 40 0.24 - 17 0 0 - 0 37 32 3 12 25.0 15 127 -61 - 1 11 45 - 0 3 26 - 1 14 35 - 0 0 37 0.24 - 16 0 0 - 1 29 32 3 12 26.4 16 127 -60 - 2 3 54 - 0 55 17 - 2 6 45 - 0 52 27 0.24 - 15 0 0 - 2 22 3 3 12 27.9 18 127 -59 - 2 56 33 - 1 47 38 - 2 59 25 - 1 44 48 0.24 - 14 0 0 - 3 15 1 3 12 29.6 19 127 -58 - 3 49 40 - 2 40 29 - 3 52 32 - 2 37 38 0.24 - 13 0 0 - 4 8 26 3 12 31.4 20 127 -57 - 4 43 13 - 3 33 45 - 4 46 6 - 3 30 54 0.24 - 12 0 0 - 5 2 15 3 12 33.2 22 127 -55 - 5 37 10 - 4 27 26 - 5 40 3 - 4 24 34 0.24 - 11 0 0 - 5 56 25 3 12 35.3 23 126 -54 - 6 31 27 - 5 21 29 - 6 34 21 - 5 18 37 0.24 - 10 0 0 - 6 50 54 3 12 37.4 24 126 -53 - 7 26 3 - 6 15 52 - 7 28 58 - 6 12 59 0.24 - 9 0 0 - 7 45 40 3 12 39.6 26 126 -52 - 8 20 55 - 7 10 31 - 8 23 50 - 7 7 37 0.24 - 8 0 0 - 8 40 39 3 12 42.0 27 126 -51 - 9 16 1 - 8 5 25 - 9 18 56 - 8 2 31 0.24 - 7 0 0 - 9 35 50 3 12 44.5 28 126 -49 -10 11 16 - 9 0 30 -10 14 12 - 8 57 35 0.24 - 6 0 0 -10 31 9 3 12 47.0 30 125 -48 -11 6 40 - 9 55 44 -11 9 36 - 9 52 49 0.24 - 5 0 0 -11 26 33 3 12 49.7 31 125 -47 -12 2 8 -10 51 4 -12 5 5 -10 48 9 0.23 - 4 0 0 -12 22 0 3 12 52.5 32 125 -46 -12 57 39 -11 46 27 -13 0 36 -11 43 32 0.23 - 3 0 0 -13 17 26 3 12 55.4 34 124 -44 -13 53 8 -12 41 51 -13 56 6 -12 38 55 0.23 - 2 0 0 -14 12 50 3 12 58.4 35 124 -43 -14 48 34 -13 37 12 -14 51 32 -13 34 16 0.23 - 1 0 0 -15 8 7 3 13 1.5 36 124 -42 -15 43 53 -14 32 28 -15 46 51 -14 29 31 0.23 0 0 0 -16 3 15 3 13 4.6 38 123 -41 -16 39 3 -15 27 35 -16 42 1 -15 24 38 0.23 1 0 0 -16 58 12 3 13 7.9 39 123 -40 -17 34 0 -16 22 31 -17 36 58 -16 19 34 0.23 2 0 0 -17 52 54 3 13 11.2 40 122 -38 -18 28 42 -17 17 13 -18 31 40 -17 14 16 0.23 3 0 0 -18 47 19 3 13 14.6 42 122 -37 -19 23 6 -18 11 39 -19 26 4 -18 8 42 0.23 4 0 0 -19 41 24 3 13 18.1 43 121 -36 -20 17 10 -19 5 45 -20 20 7 -19 2 48 0.23 5 0 0 -20 35 6 3 13 21.6 44 120 -35 -21 10 50 -19 59 29 -21 13 47 -19 56 32 0.23 6 0 0 -21 28 23 3 13 25.2 45 120 -33 -22 4 4 -20 52 48 -22 7 1 -20 49 52 0.23 7 0 0 -22 21 12 3 13 28.8 47 119 -32 -22 56 50 -21 45 40 -22 59 47 -21 42 44 0.23 8 0 0 -23 13 31 3 13 32.5 48 118 -31 -23 49 6 -22 38 3 -23 52 2 -22 35 8 0.23 9 0 0 -24 5 18 3 13 36.3 49 118 -30 -24 40 48 -23 29 55 -24 43 44 -23 26 59 0.23 10 0 0 -24 56 31 3 13 40.0 50 117 -29 -25 31 56 -24 21 12 -25 34 52 -24 18 17 0.23 11 0 0 -25 47 7 3 13 43.8 51 116 -28 -26 22 27 -25 11 54 -26 25 22 -25 8 59 0.23 12 0 0 -26 37 5 3 13 47.7 53 115 -27 -27 12 18 -26 1 58 -27 15 13 -25 59 4 0.23 13 0 0 -27 26 23 3 13 51.5 54 114 -25 -28 1 30 -26 51 22 -28 4 24 -26 48 29 0.23 14 0 0 -28 14 59 3 13 55.4 55 113 -24 -28 49 59 -27 40 6 -28 52 53 -27 37 13 0.23 15 0 0 -29 2 53 3 13 59.2 56 112 -23 -29 37 45 -28 28 6 -29 40 38 -28 25 14 0.23 16 0 0 -29 50 2 3 14 3.1 57 111 -22 -30 24 46 -29 15 23 -30 27 39 -29 12 32 0.23 17 0 0 -30 36 25 3 14 7.0 58 110 -21 -31 11 1 -30 1 55 -31 13 53 -29 59 4 0.23 18 0 0 -31 22 1 3 14 10.9 59 108 -20 -31 56 29 -30 47 40 -31 59 20 -30 44 50 0.23 19 0 0 -32 6 50 3 14 14.8 60 107 -19 -32 41 9 -31 32 38 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6 1 -53 13 27 -54 8 12 -53 11 17 0.23 108 0 0 -53 32 9 3 18 8.5 48 273 36 -53 58 32 -53 5 49 -54 0 42 -53 3 39 0.23 109 0 0 -53 24 8 3 18 10.4 48 272 36 -53 50 34 -52 57 44 -53 52 46 -52 55 33 0.23 110 0 0 -53 15 38 3 18 12.2 47 271 37 -53 42 9 -52 49 9 -53 44 21 -52 46 58 0.23 111 0 0 -53 6 40 3 18 14.0 47 270 37 -53 33 16 -52 40 6 -53 35 28 -52 37 55 0.23 112 0 0 -52 57 13 3 18 15.7 46 269 38 -53 23 53 -52 30 34 -53 26 6 -52 28 23 0.23 113 0 0 -52 47 16 3 18 17.5 45 268 38 -53 14 2 -52 20 33 -53 16 15 -52 18 21 0.23 114 0 0 -52 36 50 3 18 19.3 45 267 38 -53 3 42 -52 10 2 -53 5 55 -52 7 49 0.23 115 0 0 -52 25 54 3 18 21.1 44 266 39 -52 52 51 -51 59 0 -52 55 5 -51 56 47 0.23 116 0 0 -52 14 28 3 18 22.8 44 265 39 -52 41 31 -51 47 28 -52 43 45 -51 45 14 0.23 117 0 0 -52 2 31 3 18 24.6 43 264 40 -52 29 40 -51 35 25 -52 31 55 -51 33 11 0.23 118 0 0 -51 50 3 3 18 26.3 42 263 40 -52 17 18 -51 22 50 -52 19 33 -51 20 36 0.23 119 0 0 -51 37 3 3 18 28.1 42 262 41 -52 4 25 -51 9 44 -52 6 40 -51 7 29 0.23 120 0 0 -51 23 31 3 18 29.8 41 261 41 -51 50 59 -50 56 5 -51 53 15 -50 53 49 0.23 121 0 0 -51 9 26 3 18 31.5 40 260 41 -51 37 1 -50 41 53 -51 39 18 -50 39 37 0.23 122 0 0 -50 54 48 3 18 33.3 40 259 42 -51 22 31 -50 27 8 -51 24 48 -50 24 51 0.23 123 0 0 -50 39 36 3 18 35.0 39 259 42 -51 7 26 -50 11 49 -51 9 45 -50 9 32 0.23 124 0 0 -50 23 51 3 18 36.7 38 258 43 -50 51 48 -49 55 56 -50 54 7 -49 53 38 0.23 125 0 0 -50 7 30 3 18 38.4 38 257 43 -50 35 36 -49 39 28 -50 37 55 -49 37 9 0.23 126 0 0 -49 50 34 3 18 40.1 37 256 43 -50 18 48 -49 22 24 -50 21 8 -49 20 4 0.23 127 0 0 -49 33 3 3 18 41.8 36 255 44 -50 1 25 -49 4 44 -50 3 45 -49 2 24 0.23 128 0 0 -49 14 55 3 18 43.4 35 254 44 -49 43 25 -48 46 28 -49 45 47 -48 44 7 0.23 129 0 0 -48 56 10 3 18 45.1 35 253 44 -49 24 49 -48 27 34 -49 27 11 -48 25 13 0.23 130 0 0 -48 36 47 3 18 46.7 34 253 45 -49 5 35 -48 8 3 -49 7 58 -48 5 41 0.23 131 0 0 -48 16 46 3 18 48.4 33 252 45 -48 45 43 -47 47 53 -48 48 7 -47 45 30 0.23 132 0 0 -47 56 7 3 18 50.0 33 251 46 -48 25 13 -47 27 4 -48 27 37 -47 24 41 0.24 133 0 0 -47 34 48 3 18 51.6 32 250 46 -48 4 3 -47 5 36 -48 6 28 -47 3 11 0.24 134 0 0 -47 12 49 3 18 53.2 31 249 46 -47 42 14 -46 43 27 -47 44 40 -46 41 2 0.24 135 0 0 -46 50 9 3 18 54.8 30 249 47 -47 19 44 -46 20 38 -47 22 10 -46 18 12 0.24 136 0 0 -46 26 48 3 18 56.3 29 248 47 -46 56 32 -45 57 7 -46 59 0 -45 54 40 0.24 137 0 0 -46 2 45 3 18 57.9 29 247 47 -46 32 39 -45 32 54 -46 35 8 -45 30 26 0.24 138 0 0 -45 37 59 3 18 59.4 28 246 48 -46 8 4 -45 7 58 -46 10 33 -45 5 30 0.24 139 0 0 -45 12 30 3 19 0.9 27 245 48 -45 42 46 -44 42 19 -45 45 16 -44 39 50 0.24 140 0 0 -44 46 18 3 19 2.4 26 245 48 -45 16 43 -44 15 57 -45 19 14 -44 13 26 0.24 141 0 0 -44 19 21 3 19 3.8 25 244 49 -44 49 57 -43 48 49 -44 52 29 -43 46 18 0.24 142 0 0 -43 51 39 3 19 5.3 25 243 49 -44 22 26 -43 20 57 -44 24 59 -43 18 25 0.24 143 0 0 -43 23 12 3 19 6.7 24 242 49 -43 54 9 -42 52 19 -43 56 43 -42 49 46 0.24 144 0 0 -42 53 59 3 19 8.0 23 242 49 -43 25 7 -42 22 56 -43 27 42 -42 20 22 0.24 145 0 0 -42 23 59 3 19 9.4 22 241 50 -42 55 18 -41 52 45 -42 57 54 -41 50 10 0.24 146 0 0 -41 53 13 3 19 10.7 21 240 50 -42 24 42 -41 21 48 -42 27 19 -41 19 12 0.24 147 0 0 -41 21 38 3 19 12.0 20 240 50 -41 53 19 -40 50 3 -41 55 56 -40 47 26 0.24 148 0 0 -40 49 17 3 19 13.2 19 239 50 -41 21 8 -40 17 30 -41 23 46 -40 14 53 0.25 149 0 0 -40 16 6 3 19 14.4 18 238 50 -40 48 9 -39 44 9 -40 50 48 -39 41 31 0.25 150 0 0 -39 42 8 3 19 15.6 17 238 51 -40 14 21 -39 10 0 -40 17 1 -39 7 21 0.25 151 0 0 -39 7 21 3 19 16.7 16 237 51 -39 39 44 -38 35 2 -39 42 25 -38 32 22 0.25 152 0 0 -38 31 44 3 19 17.7 15 236 51 -39 4 18 -37 59 15 -39 7 0 -37 56 34 0.25 153 0 0 -37 55 19 3 19 18.7 14 236 51 -38 28 4 -37 22 39 -38 30 46 -37 19 58 0.25 154 0 0 -37 18 4 3 19 19.7 13 235 51 -37 51 0 -36 45 14 -37 53 43 -36 42 32 0.25 155 0 0 -36 40 1 3 19 20.6 12 234 51 -37 13 6 -36 7 1 -37 15 50 -36 4 17 0.26 156 0 0 -36 1 8 3 19 21.4 11 234 51 -36 34 23 -35 27 58 -36 37 9 -35 25 14 0.26 157 0 0 -35 21 26 3 19 22.2 10 233 51 -35 54 52 -34 48 6 -35 57 38 -34 45 21 0.26 158 0 0 -34 40 56 3 19 22.9 9 233 51 -35 14 31 -34 7 26 -35 17 18 -34 4 41 0.27 159 0 0 -33 59 37 3 19 23.6 8 232 51 -34 33 22 -33 25 59 -34 36 10 -33 23 12 0.27 160 0 0 -33 17 31 3 19 24.1 7 232 51 -33 51 25 -32 43 43 -33 54 13 -32 40 56 0.28 161 0 0 -32 34 37 3 19 24.6 6 231 51 -33 8 40 -32 0 40 -33 11 29 -31 57 52 0.29 162 0 0 -31 50 57 3 19 25.1 5 230 50 -32 25 8 -31 16 52 -32 27 58 -31 14 3 0.30 163 0 0 -31 6 31 3 19 25.4 4 230 50 -31 40 50 -30 32 17 -31 43 41 -30 29 28 0.32 164 0 0 -30 21 19 3 19 25.6 3 229 50 -30 55 47 -29 46 58 -30 58 38 -29 44 8 0.36 165 0 0 -29 35 24 3 19 25.8 1 229 50 -30 9 59 -29 0 56 -30 12 51 -28 58 5 0.47 166 0 0 -28 48 46 3 19 25.9 0 228 49 -29 23 28 .. .. .. -29 26 21 .. .. .. 1.93 Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 272-150358 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 08 36.1523 DE: -35 43 53.203 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 08 36.1523 DE: -35 43 53.203 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (326) Tamara asteroid class: approx. diameter [km]: 93 approx. diameter ["]: 0.070 distance from Earth [AU]: 1.82870 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 date of fit: 2023 Feb 07 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.012", 0.002", 103.433° remarks: * orbital elements for (326)Tamara : Mean anomaly = 340.9535130778 deg Arg. of pericenter = 238.5208419390 deg Long. of node = 32.1686371224 deg Inclination = 23.7244813943 deg Eccentricity = 0.1896304935 Semimajor axis = 2.3177130329 AU Perihelion dist = 1.8782039667 AU Mag: H = 9.34, G = 0.15 Epoch of elements : MJD 60015.13597222 TDT (2023 Mar 12.1360) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Feb07,3.21,2023,3,12,3.264381,-0.086542,-0.200999,15.043697,-6.502374,-0.005128,-0.000306,0.000000,0.000000 54.0520,-35.7272,133.51,-3.46,False UCAC4 272-150358,18.14337558,-35.7314452,0.00,10.18,0.00,0.0,0,,18.16905913,-35.7272331,3.26,0.00,0,0,0 326,Tamara,13.38,93.1,1.8287,0,0,5.942,-31.26,,5.8,0 0,340.9155,2023,3,12,238.5208,32.1686,23.7245,0.18963,2.31771,1.87820,9.34,5.0,0.15 1.041,0.0123,0.0020,103,0.0029,Known errors,-1.00,-1,-1,-1 20230312_150358,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org