IOTA/IOTA-ES occultation update for (326) Tamara / UCAC4-271-152363 event on 2023 Mar 12, 20:42 UT Visible from Japan Summary ------- On 2023 Mar 12 UT, the 93.1 km diameter asteroid (326) Tamara will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.35 mag to 13.37 mag (the magnitude of the asteroid) for at most 3.220 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, 20:39 - 2023 Mar 12, 20:45 * geocentric midpoint of event [JD]: 2460016.36293650 * magnitude of target star: 12.39 * magnitude drop [mag]: 1.35 * estimated maximum duration [s]: 3.220 * Moon: 73 % sunlit, 39° distance * Sun: 80° distance * rough path description: Japan The occultation path -------------------- * approximate projected width [km]: 135 * 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]: 28.8780 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-271-152363 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 120 0 0 .. .. .... .. .. .. .. .. .. 49 5 28 .. .. .. 48 58 42 .. .. .. .... 121 0 0 49 6 49 20 40 5.6 1 155 -16 47 45 34 .. .. .. 47 38 58 .. .. .. .... 122 0 0 47 45 18 20 40 5.8 2 155 -16 46 26 17 49 8 48 46 19 51 49 16 1 -0.54 123 0 0 46 24 36 20 40 6.2 4 156 -16 45 7 41 47 45 37 45 1 25 47 52 37 -0.74 124 0 0 45 4 48 20 40 6.8 5 157 -15 43 49 53 46 23 28 43 43 47 46 30 15 -0.83 125 0 0 43 45 57 20 40 7.6 7 158 -15 42 32 57 45 2 25 42 26 59 45 8 59 -0.88 126 0 0 42 28 8 20 40 8.7 8 158 -14 41 16 57 43 42 31 41 11 8 43 48 54 -0.91 127 0 0 41 11 24 20 40 9.9 10 159 -14 40 1 58 42 23 49 39 56 16 42 30 1 -0.93 128 0 0 39 55 49 20 40 11.4 11 160 -13 38 48 1 41 6 21 38 42 28 41 12 24 -0.94 129 0 0 38 41 25 20 40 13.0 12 161 -12 37 35 12 39 50 12 37 29 45 39 56 5 -0.95 130 0 0 37 28 15 20 40 14.8 14 161 -12 36 23 31 38 35 22 36 18 12 38 41 5 -0.96 131 0 0 36 16 21 20 40 16.8 15 162 -11 35 13 2 37 21 52 35 7 50 37 27 28 -0.97 132 0 0 35 5 45 20 40 19.0 17 163 -10 34 3 48 36 9 46 33 58 42 36 15 13 -0.98 133 0 0 33 56 28 20 40 21.4 18 163 -10 32 55 49 34 59 4 32 50 49 35 4 24 -0.98 134 0 0 32 48 32 20 40 23.9 19 164 -9 31 49 7 33 49 47 31 44 13 33 54 59 -0.99 135 0 0 31 41 59 20 40 26.5 21 165 -8 30 43 44 32 41 56 30 38 56 32 47 2 -0.99 136 0 0 30 36 48 20 40 29.3 22 166 -7 29 39 41 31 35 32 29 34 58 31 40 32 -1.00 137 0 0 29 33 2 20 40 32.2 23 166 -6 28 36 58 30 30 36 28 32 21 30 35 30 -1.00 138 0 0 28 30 40 20 40 35.3 24 167 -5 27 35 37 29 27 8 27 31 5 29 31 55 -1.00 139 0 0 27 29 43 20 40 38.4 25 168 -4 26 35 39 28 25 7 26 31 11 28 29 50 -1.00 140 0 0 26 30 11 20 40 41.7 27 169 -3 25 37 3 27 24 36 25 32 40 27 29 12 -1.01 141 0 0 25 32 5 20 40 45.1 28 169 -2 24 39 50 26 25 32 24 35 31 26 30 4 -1.01 142 0 0 24 35 24 20 40 48.5 29 170 -2 23 44 1 25 27 57 23 39 46 25 32 24 -1.01 143 0 0 23 40 9 20 40 52.1 30 171 -1 22 49 35 24 31 50 22 45 24 24 36 13 -1.01 144 0 0 22 46 20 20 40 55.7 31 172 0 21 56 31 23 37 11 21 52 24 23 41 29 -1.02 145 0 0 21 53 55 20 40 59.5 32 173 1 21 4 51 22 43 59 21 0 48 22 48 13 -1.02 146 0 0 21 2 55 20 41 3.2 33 174 2 20 14 34 21 52 13 20 10 34 21 56 24 -1.02 147 0 0 20 13 19 20 41 7.1 34 175 3 19 25 40 21 1 54 19 21 43 21 6 1 -1.02 148 0 0 19 25 8 20 41 11.0 35 176 4 18 38 7 20 13 1 18 34 13 20 17 4 -1.02 149 0 0 18 38 19 20 41 14.9 35 177 6 17 51 56 19 25 33 17 48 5 19 29 33 -1.02 150 0 0 17 52 54 20 41 18.9 36 178 7 17 7 6 18 39 30 17 3 18 18 43 27 -1.03 151 0 0 17 8 51 20 41 23.0 37 179 8 16 23 37 17 54 51 16 19 52 17 58 44 -1.03 152 0 0 16 26 9 20 41 27.1 38 180 9 15 41 28 17 11 35 15 37 46 17 15 26 -1.03 153 0 0 15 44 48 20 41 31.2 38 181 10 15 0 39 16 29 42 14 56 59 16 33 29 -1.03 154 0 0 15 4 48 20 41 35.3 39 182 11 14 21 8 15 49 10 14 17 31 15 52 55 -1.03 155 0 0 14 26 7 20 41 39.5 40 183 12 13 42 56 15 10 0 13 39 21 15 13 42 -1.03 156 0 0 13 48 45 20 41 43.6 40 184 13 13 6 1 14 32 9 13 2 28 14 35 49 -1.03 157 0 0 13 12 41 20 41 47.8 41 185 14 12 30 23 13 55 38 12 26 52 13 59 15 -1.03 158 0 0 12 37 54 20 41 52.0 41 186 15 11 56 1 13 20 25 11 52 32 13 24 0 -1.04 159 0 0 12 4 24 20 41 56.2 42 187 16 11 22 54 12 46 30 11 19 27 12 50 3 -1.04 160 0 0 11 32 10 20 42 0.4 42 188 17 10 51 2 12 13 52 10 47 37 12 17 23 -1.04 161 0 0 11 1 10 20 42 4.7 42 190 18 10 20 24 11 42 30 10 17 1 11 46 0 -1.04 162 0 0 10 31 25 20 42 8.9 43 191 19 9 51 0 11 12 24 9 47 38 11 15 51 -1.04 163 0 0 10 2 54 20 42 13.1 43 192 20 9 22 48 10 43 33 9 19 28 10 46 58 -1.04 164 0 0 9 35 35 20 42 17.3 43 193 21 8 55 48 10 15 55 8 52 29 10 19 19 -1.04 165 0 0 9 9 29 20 42 21.4 43 194 22 8 29 59 9 49 30 8 26 42 9 52 53 -1.04 166 0 0 8 44 34 20 42 25.6 44 196 23 8 5 21 9 24 18 8 2 6 9 27 39 -1.04 167 0 0 8 20 51 20 42 29.8 44 197 24 7 41 53 9 0 18 7 38 39 9 3 38 -1.04 168 0 0 7 58 17 20 42 33.9 44 198 25 7 19 34 8 37 29 7 16 21 8 40 47 -1.04 169 0 0 7 36 53 20 42 38.0 44 199 26 6 58 24 8 15 50 6 55 12 8 19 7 -1.05 170 0 0 7 16 38 20 42 42.1 44 200 28 6 38 22 7 55 22 6 35 12 7 58 38 -1.05 171 0 0 6 57 31 20 42 46.2 44 201 29 6 19 28 7 36 2 6 16 18 7 39 17 -1.05 172 0 0 6 39 32 20 42 50.2 44 202 30 6 1 41 7 17 51 5 58 32 7 21 5 -1.05 173 0 0 6 22 41 20 42 54.3 43 204 31 5 45 1 7 0 49 5 41 53 7 4 2 -1.05 174 0 0 6 6 57 20 42 58.2 43 205 32 5 29 26 6 44 54 5 26 19 6 48 6 -1.05 175 0 0 5 52 19 20 43 2.2 43 206 33 5 14 57 6 30 6 5 11 51 6 33 17 -1.05 176 0 0 5 38 46 20 43 6.1 43 207 34 5 1 34 6 16 25 4 58 28 6 19 35 -1.05 177 0 0 5 26 20 20 43 10.0 42 208 35 4 49 15 6 3 50 4 46 10 6 7 0 -1.05 178 0 0 5 14 58 20 43 13.9 42 209 36 4 38 1 5 52 21 4 34 57 5 55 30 -1.05 179 0 0 5 4 41 20 43 17.7 42 210 37 4 27 51 5 41 57 4 24 47 5 45 6 -1.05 180 0 0 4 55 29 20 43 21.5 41 211 38 4 18 44 5 32 39 4 15 41 5 35 47 -1.05 -179 0 0 4 47 21 20 43 25.3 41 212 39 4 10 41 5 24 25 4 7 38 5 27 33 -1.05 -178 0 0 4 40 16 20 43 29.0 41 212 40 4 3 41 5 17 16 4 0 39 5 20 23 -1.05 -177 0 0 4 34 16 20 43 32.7 40 213 41 3 57 44 5 11 11 3 54 42 5 14 18 -1.05 -176 0 0 4 29 18 20 43 36.3 40 214 42 3 52 50 5 6 11 3 49 48 5 9 17 -1.05 -175 0 0 4 25 24 20 43 39.9 39 215 43 3 48 59 5 2 14 3 45 57 5 5 20 -1.05 -174 0 0 4 22 33 20 43 43.4 39 216 44 3 46 10 4 59 21 3 43 8 5 2 27 -1.05 -173 0 0 4 20 45 20 43 46.9 38 216 45 3 44 23 4 57 31 3 41 21 5 0 37 -1.05 -172 0 0 4 20 0 20 43 50.4 37 217 46 3 43 38 4 56 46 3 40 37 4 59 51 -1.05 -171 0 0 4 20 17 20 43 53.8 37 218 47 3 43 56 4 57 3 3 40 54 5 0 9 -1.05 -170 0 0 4 21 38 20 43 57.2 36 218 48 3 45 16 4 58 24 3 42 14 5 1 30 -1.05 -169 0 0 4 24 1 20 44 0.5 36 219 49 3 47 37 5 0 48 3 44 36 5 3 54 -1.05 -168 0 0 4 27 27 20 44 3.7 35 220 50 3 51 1 5 4 16 3 48 0 5 7 22 -1.05 -167 0 0 4 31 55 20 44 6.9 34 220 51 3 55 28 5 8 48 3 52 26 5 11 54 -1.05 -166 0 0 4 37 27 20 44 10.0 33 221 52 4 0 56 5 14 23 3 57 54 5 17 29 -1.05 -165 0 0 4 44 2 20 44 13.1 33 221 53 4 7 27 5 21 1 4 4 25 5 24 8 -1.05 -164 0 0 4 51 40 20 44 16.2 32 222 54 4 15 1 5 28 44 4 11 58 5 31 51 -1.05 -163 0 0 5 0 22 20 44 19.1 31 222 55 4 23 37 5 37 31 4 20 34 5 40 39 -1.05 -162 0 0 5 10 7 20 44 22.0 30 223 56 4 33 17 5 47 22 4 30 13 5 50 30 -1.05 -161 0 0 5 20 56 20 44 24.9 29 223 57 4 43 59 5 58 17 4 40 55 6 1 26 -1.05 -160 0 0 5 32 49 20 44 27.7 29 224 58 4 55 45 6 10 18 4 52 40 6 13 27 -1.05 -159 0 0 5 45 46 20 44 30.4 28 224 58 5 8 35 6 23 23 5 5 29 6 26 34 -1.05 -158 0 0 5 59 48 20 44 33.0 27 224 59 5 22 29 6 37 34 5 19 22 6 40 45 -1.05 -157 0 0 6 14 56 20 44 35.6 26 225 60 5 37 27 6 52 51 5 34 20 6 56 3 -1.05 -156 0 0 6 31 8 20 44 38.1 25 225 61 5 53 29 7 9 14 5 50 22 7 12 27 -1.05 -155 0 0 6 48 27 20 44 40.5 24 226 62 6 10 37 7 26 44 6 7 29 7 29 57 -1.05 -154 0 0 7 6 52 20 44 42.9 23 226 63 6 28 51 7 45 21 6 25 41 7 48 35 -1.06 -153 0 0 7 26 23 20 44 45.1 22 226 64 6 48 10 8 5 5 6 45 0 8 8 20 -1.06 -152 0 0 7 47 2 20 44 47.3 21 226 64 7 8 36 8 25 57 7 5 24 8 29 13 -1.06 -151 0 0 8 8 48 20 44 49.5 20 227 65 7 30 9 8 47 57 7 26 56 8 51 15 -1.06 -150 0 0 8 31 43 20 44 51.5 19 227 66 7 52 48 9 11 7 7 49 34 9 14 26 -1.06 -149 0 0 8 55 46 20 44 53.4 18 227 67 8 16 36 9 35 26 8 13 21 9 38 46 -1.06 -148 0 0 9 20 58 20 44 55.3 17 228 67 8 41 32 10 0 55 8 38 16 10 4 17 -1.06 -147 0 0 9 47 20 20 44 57.0 16 228 68 9 7 37 10 27 35 9 4 19 10 30 58 -1.06 -146 0 0 10 14 53 20 44 58.7 15 228 68 9 34 52 10 55 26 9 31 32 10 58 51 -1.06 -145 0 0 10 43 36 20 45 0.2 14 228 69 10 3 16 11 24 29 9 59 55 11 27 56 -1.06 -144 0 0 11 13 31 20 45 1.7 13 229 69 10 32 51 11 54 45 10 29 29 11 58 13 -1.06 -143 0 0 11 44 38 20 45 3.1 12 229 70 11 3 37 12 26 13 11 0 13 12 29 44 -1.07 -142 0 0 12 16 58 20 45 4.3 11 229 70 11 35 35 12 58 56 11 32 9 13 2 28 -1.07 -141 0 0 12 50 31 20 45 5.5 10 229 70 12 8 46 13 32 53 12 5 18 13 36 27 -1.07 -140 0 0 13 25 18 20 45 6.5 9 230 70 12 43 9 14 8 5 12 39 39 14 11 42 -1.08 -139 0 0 14 1 20 20 45 7.4 8 230 70 13 18 45 14 44 33 13 15 13 14 48 12 -1.08 -138 0 0 14 38 37 20 45 8.2 7 230 70 13 55 36 15 22 18 13 52 2 15 25 59 -1.09 -137 0 0 15 17 10 20 45 8.8 5 231 70 14 33 41 16 1 20 14 30 5 16 5 3 -1.10 -136 0 0 15 56 59 20 45 9.4 4 231 70 15 13 2 16 41 39 15 9 23 16 45 25 -1.12 -135 0 0 16 38 5 20 45 9.8 3 231 69 15 53 38 17 23 17 15 49 57 17 27 6 -1.15 -134 0 0 17 20 29 20 45 10.1 2 231 69 16 35 30 18 6 14 16 31 47 18 10 6 -1.23 -133 0 0 18 4 11 20 45 10.2 1 232 68 17 18 39 18 50 30 17 14 53 18 54 25 -1.60 Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-271-152363 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 19.5631 DE: -35 53 06.401 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 10 19.5632 DE: -35 53 06.401 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * 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]: 1.82080 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", 103.129° remarks: * orbital elements for (326)Tamara : Mean anomaly = 341.1565202862 deg Arg. of pericenter = 238.5208525830 deg Long. of node = 32.1686370177 deg Inclination = 23.7244813229 deg Eccentricity = 0.1896299655 Semimajor axis = 2.3177115933 AU Perihelion dist = 1.8782040237 AU Mag: H = 9.34, G = 0.15 Epoch of elements : MJD 60015.86284722 TDT (2023 Mar 12.8628) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Feb07,3.22,2023,3,12,20.710476,0.287331,0.662987,14.958050,-6.475495,-0.005134,-0.000318,0.000000,0.000000 152.0755,-35.8799,-128.23,-3.17,False UCAC4-271-152363,18.17210082,-35.8851114,0.00,12.39,0.00,0.0,0,,18.19782208,-35.8799133,1.35,0.00,0,0,0 326,Tamara,13.37,93.1,1.8208,0,0,5.945,-31.27,,5.8,0 0,340.9155,2023,3,12,238.5209,32.1686,23.7245,0.18963,2.31771,1.87820,9.34,5.0,0.15 1.042,0.0123,0.0020,103,0.0029,Known errors,-1.00,-1,-1,-1 20230312_152363,59990.87 ------ 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