IOTA/IOTA-ES occultation update for (445) Edna / TYC 7876-02641-1 event on 2023 May 28, 18:18 UT Visible from N Australia, Africa Summary ------- On 2023 May 28 UT, the 90.3 km diameter asteroid (445) Edna will occult a 11.7 mag star in the constellation Scorpius for observers along a path across N Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.74 mag to 14.36 mag (the magnitude of the asteroid) for at most 6.280 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: 99 * date and approx. time of event: 2023 May 28, 18:12 - 2023 May 28, 18:26 * geocentric midpoint of event [JD]: 2460093.26321600 * magnitude of target star: 11.71 * magnitude drop [mag]: 2.74 * estimated maximum duration [s]: 6.280 * Moon: 61 % sunlit, 89° distance * Sun: 158° distance * rough path description: N Australia, Africa The occultation path -------------------- * approximate projected width [km]: 98 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 81°) * approx speed of asteroid's shadow [km/s]: 14.3881 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7876-02641-1 by 445 Edna on 2023 May 28 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 31 0 0 28 19 23 18 25 49.5 0 139 -19 .. .. .. 27 38 36 .. .. .. 27 24 27 .... 32 0 0 27 17 57 18 25 49.3 2 140 -21 27 58 57 26 37 16 28 13 20 26 23 9 -0.15 33 0 0 26 16 16 18 25 48.8 3 140 -22 26 57 9 25 35 43 27 11 29 25 21 39 -0.28 34 0 0 25 14 25 18 25 48.1 4 141 -23 25 55 9 24 34 0 26 9 26 24 19 59 -0.33 35 0 0 24 12 27 18 25 47.1 6 141 -25 24 53 1 23 32 11 25 7 15 23 18 13 -0.36 36 0 0 23 10 26 18 25 45.8 7 141 -26 23 50 50 22 30 21 24 5 0 22 16 26 -0.38 37 0 0 22 8 27 18 25 44.2 9 142 -28 22 48 40 21 28 32 23 2 46 21 14 41 -0.39 38 0 0 21 6 32 18 25 42.4 10 142 -29 21 46 33 20 26 50 22 0 35 20 13 3 -0.40 39 0 0 20 4 47 18 25 40.3 11 143 -30 20 44 35 19 25 16 20 58 33 19 11 33 -0.40 40 0 0 19 3 13 18 25 37.9 13 143 -32 19 42 49 18 23 56 19 56 41 18 10 17 -0.41 41 0 0 18 1 56 18 25 35.2 14 143 -33 18 41 17 17 22 52 18 55 5 17 9 18 -0.41 42 0 0 17 0 58 18 25 32.2 15 144 -34 17 40 5 16 22 7 17 53 48 16 8 39 -0.42 43 0 0 16 0 22 18 25 29.0 17 144 -36 16 39 14 15 21 46 16 52 52 15 8 22 -0.42 44 0 0 15 0 12 18 25 25.6 18 144 -37 15 38 49 14 21 51 15 52 22 14 8 32 -0.42 45 0 0 14 0 31 18 25 21.8 20 145 -39 14 38 53 13 22 25 14 52 19 13 9 11 -0.42 46 0 0 13 1 21 18 25 17.9 21 145 -40 13 39 27 12 23 31 13 52 48 12 10 22 -0.42 47 0 0 12 2 45 18 25 13.7 22 145 -41 12 40 35 11 25 11 12 53 51 11 12 8 -0.43 48 0 0 11 4 46 18 25 9.2 24 145 -43 11 42 20 10 27 28 11 55 30 10 14 30 -0.43 49 0 0 10 7 26 18 25 4.6 25 146 -44 10 44 44 9 30 24 10 57 48 9 17 32 -0.43 50 0 0 9 10 47 18 24 59.7 26 146 -45 9 47 48 8 34 1 10 0 46 8 21 15 -0.43 51 0 0 8 14 52 18 24 54.6 28 146 -47 8 51 36 7 38 22 9 4 28 7 25 41 -0.43 52 0 0 7 19 41 18 24 49.3 29 147 -48 7 56 9 6 43 27 8 8 55 6 30 52 -0.43 53 0 0 6 25 17 18 24 43.8 30 147 -49 7 1 28 5 49 19 7 14 8 5 36 50 -0.43 54 0 0 5 31 41 18 24 38.2 31 147 -51 6 7 35 4 56 0 6 20 10 4 43 36 -0.43 55 0 0 4 38 54 18 24 32.4 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21 3 -20 18 14 -21 30 21 -0.43 128 0 0 -20 47 50 18 15 54.1 55 226 -50 -20 21 0 -21 14 33 -20 11 38 -21 23 52 -0.43 129 0 0 -20 40 34 18 15 47.8 54 226 -49 -20 13 42 -21 7 21 -20 4 18 -21 16 40 -0.43 130 0 0 -20 32 35 18 15 41.5 53 227 -48 -20 5 40 -20 59 25 -19 56 15 -21 8 45 -0.43 131 0 0 -20 23 52 18 15 35.3 52 227 -48 -19 56 54 -20 50 45 -19 47 28 -21 0 6 -0.43 132 0 0 -20 14 26 18 15 29.2 52 227 -47 -19 47 24 -20 41 22 -19 37 56 -20 50 45 -0.43 133 0 0 -20 4 15 18 15 23.1 51 228 -46 -19 37 9 -20 31 15 -19 27 40 -20 40 39 -0.43 134 0 0 -19 53 19 18 15 17.0 50 228 -45 -19 26 9 -20 20 24 -19 16 39 -20 29 49 -0.43 135 0 0 -19 41 39 18 15 11.0 49 228 -44 -19 14 25 -20 8 48 -19 4 53 -20 18 15 -0.43 136 0 0 -19 29 14 18 15 5.0 49 228 -43 -19 1 54 -19 56 27 -18 52 21 -20 5 55 -0.43 137 0 0 -19 16 3 18 14 59.1 48 228 -42 -18 48 39 -19 43 21 -18 39 4 -19 52 51 -0.43 138 0 0 -19 2 6 18 14 53.2 47 229 -41 -18 34 37 -19 29 30 -18 25 0 -19 39 1 -0.43 139 0 0 -18 47 23 18 14 47.4 46 229 -40 -18 19 48 -19 14 52 -18 10 9 -19 24 26 -0.43 140 0 0 -18 31 53 18 14 41.6 45 229 -39 -18 4 13 -18 59 28 -17 54 32 -19 9 4 -0.43 141 0 0 -18 15 37 18 14 35.9 44 229 -38 -17 47 50 -18 43 18 -17 38 7 -18 52 55 -0.43 142 0 0 -17 58 33 18 14 30.3 43 229 -37 -17 30 39 -18 26 20 -17 20 54 -18 36 0 -0.43 143 0 0 -17 40 40 18 14 24.7 42 229 -36 -17 12 40 -18 8 34 -17 2 53 -18 18 17 -0.43 144 0 0 -17 22 0 18 14 19.2 42 229 -35 -16 53 53 -17 50 1 -16 44 3 -17 59 46 -0.43 145 0 0 -17 2 31 18 14 13.7 41 229 -34 -16 34 16 -17 30 39 -16 24 23 -17 40 26 -0.43 146 0 0 -16 42 12 18 14 8.3 40 229 -33 -16 13 50 -17 10 27 -16 3 54 -17 20 17 -0.44 147 0 0 -16 21 3 18 14 3.0 39 229 -32 -15 52 33 -16 49 27 -15 42 35 -16 59 19 -0.44 148 0 0 -15 59 4 18 13 57.7 38 229 -31 -15 30 26 -16 27 36 -15 20 25 -16 37 31 -0.44 149 0 0 -15 36 14 18 13 52.5 37 229 -30 -15 7 27 -16 4 54 -14 57 23 -16 14 53 -0.44 150 0 0 -15 12 33 18 13 47.4 36 229 -29 -14 43 37 -15 41 22 -14 33 30 -15 51 23 -0.44 151 0 0 -14 48 0 18 13 42.4 35 229 -28 -14 18 55 -15 16 58 -14 8 44 -15 27 2 -0.44 152 0 0 -14 22 34 18 13 37.5 34 229 -27 -13 53 19 -14 51 41 -13 43 6 -15 1 49 -0.44 153 0 0 -13 56 15 18 13 32.6 33 229 -26 -13 26 51 -14 25 32 -13 16 34 -14 35 44 -0.44 154 0 0 -13 29 3 18 13 27.9 32 229 -25 -12 59 28 -13 58 30 -12 49 7 -14 8 45 -0.44 155 0 0 -13 0 56 18 13 23.2 31 229 -24 -12 31 11 -13 30 34 -12 20 47 -13 40 52 -0.44 156 0 0 -12 31 55 18 13 18.7 30 229 -23 -12 1 59 -13 1 44 -11 51 31 -13 12 6 -0.44 157 0 0 -12 1 59 18 13 14.2 29 229 -22 -11 31 52 -12 31 58 -11 21 19 -12 42 24 -0.44 158 0 0 -11 31 7 18 13 9.9 28 229 -21 -11 0 48 -12 1 17 -10 50 12 -12 11 47 -0.44 159 0 0 -10 59 18 18 13 5.7 27 229 -20 -10 28 48 -11 29 41 -10 18 7 -11 40 14 -0.44 160 0 0 -10 26 33 18 13 1.6 26 229 -19 - 9 55 50 -10 57 7 - 9 45 5 -11 7 45 -0.44 161 0 0 - 9 52 50 18 12 57.6 24 229 -18 - 9 21 55 -10 23 37 - 9 11 6 -10 34 19 -0.44 162 0 0 - 9 18 10 18 12 53.7 23 228 -16 - 8 47 2 - 9 49 9 - 8 36 8 - 9 59 56 -0.44 163 0 0 - 8 42 32 18 12 50.0 22 228 -15 - 8 11 10 - 9 13 44 - 8 0 12 - 9 24 35 -0.44 164 0 0 - 8 5 54 18 12 46.4 21 228 -14 - 7 34 20 - 8 37 20 - 7 23 17 - 8 48 16 -0.45 165 0 0 - 7 28 18 18 12 43.0 20 228 -13 - 6 56 30 - 7 59 58 - 6 45 22 - 8 10 58 -0.45 166 0 0 - 6 49 43 18 12 39.8 19 228 -12 - 6 17 40 - 7 21 36 - 6 6 27 - 7 32 41 -0.45 167 0 0 - 6 10 8 18 12 36.6 18 228 -11 - 5 37 51 - 6 42 15 - 5 26 33 - 6 53 25 -0.45 168 0 0 - 5 29 33 18 12 33.7 16 228 -10 - 4 57 1 - 6 1 55 - 4 45 37 - 6 13 10 -0.45 169 0 0 - 4 47 57 18 12 30.9 15 228 -8 - 4 15 10 - 5 20 34 - 4 3 42 - 5 31 55 -0.45 170 0 0 - 4 5 22 18 12 28.4 14 228 -7 - 3 32 20 - 4 38 14 - 3 20 46 - 4 49 40 -0.45 171 0 0 - 3 21 46 18 12 26.0 13 228 -6 - 2 48 28 - 3 54 54 - 2 36 49 - 4 6 25 -0.45 172 0 0 - 2 37 10 18 12 23.8 12 228 -5 - 2 3 36 - 3 10 33 - 1 51 51 - 3 22 10 -0.45 173 0 0 - 1 51 34 18 12 21.8 10 228 -4 - 1 17 44 - 2 25 13 - 1 5 53 - 2 36 55 -0.45 174 0 0 - 1 4 58 18 12 20.0 9 228 -2 - 0 30 51 - 1 38 53 - 0 18 54 - 1 50 40 -0.46 175 0 0 - 0 17 21 18 12 18.4 8 228 -1 0 17 2 - 0 51 33 0 29 5 - 1 3 26 -0.46 176 0 0 0 31 14 18 12 17.0 7 228 0 1 5 55 - 0 3 15 1 18 3 - 0 15 13 -0.46 177 0 0 1 20 48 18 12 15.9 5 228 1 1 55 46 0 46 3 2 8 1 0 33 58 -0.47 178 0 0 2 11 21 18 12 15.0 4 228 2 2 46 36 1 36 19 2 58 57 1 24 8 -0.47 179 0 0 3 2 51 18 12 14.4 3 228 4 3 38 24 2 27 32 3 50 51 2 15 15 -0.48 180 0 0 3 55 18 18 12 14.0 1 228 5 4 31 8 3 19 41 4 43 42 3 7 19 -0.52 -179 0 0 4 48 41 18 12 13.9 0 228 6 .. .. .. 4 12 46 .. .. .. 4 0 18 -2.78 Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 7876-02641-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 55 57.4061 DE: -41 35 49.431 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 55 57.4061 DE: -41 35 49.431 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (445) Edna asteroid class: approx. diameter [km]: 90 approx. diameter ["]: 0.051 distance from Earth [AU]: 2.46280 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2023 Apr 24 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): 0.020", 0.002", 81.287° remarks: * orbital elements for (445)Edna : Mean anomaly = 259.2891176299 deg Arg. of pericenter = 81.8070911586 deg Long. of node = 291.9735723328 deg Inclination = 21.3099636894 deg Eccentricity = 0.1978403879 Semimajor axis = 3.1963351449 AU Perihelion dist = 2.5639709599 AU Mag: H = 9.26, G = 0.15 Epoch of elements : MJD 60092.76312500 TDT (2023 May 28.7631) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,6.28,2023,5,28,18.317184,0.111513,0.374680,-7.783603,2.316734,-0.000805,0.001917,0.000001,0.000000 93.6148,-41.6345,-95.43,21.51,False TYC 7876-02641-1,16.93261279,-41.5970641,0.00,11.71,0.00,0.0,0,,16.96025786,-41.6345209,2.74,0.00,0,0,0 445,Edna,14.36,90.3,2.4628,0,0,-2.479,8.28,,4.8,0 0,259.1575,2023,5,28,81.8071,291.9736,21.3100,0.19784,3.19634,2.56397,9.25,5.0,0.15 1.174,0.0200,0.0024,81,0.0088,Known errors,-1.00,-1,-1,-1 20230528_2641-1,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org