IOTA/IOTA-ES occultation update for (579) Sidonia / UCAC4 306-279051 event on 2024 Jul 08, 02:55 UT Visible from Summary ------- On 2024 Jul 08 UT, the 88.538 km diameter asteroid (579) Sidonia will occult a 12.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.75 mag to 11.94 mag (the magnitude of the asteroid) for at most 8.240 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: 2024 Jul 08, 02:49 - 2024 Jul 08, 03:02 * geocentric midpoint of event [JD]: 2460499.62201579 * magnitude of target star: 11.95 * magnitude drop [mag]: 0.75 * estimated maximum duration [s]: 8.240 * Moon: 5 % sunlit, 168° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 138 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.002", 84°) * approx speed of asteroid's shadow [km/s]: 10.7512 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 306-279051 by 579 Sidonia on 2024 Jul 8 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 -108 0 0 12 42 41 3 2 2.1 0 120 -18 .. .. .. 11 59 10 .. .. .. 11 41 28 .... -107 0 0 12 9 51 3 2 1.9 1 120 -19 12 53 37 11 26 50 13 11 53 11 9 19 -0.47 -106 0 0 11 38 29 3 2 1.4 2 120 -21 12 21 46 10 55 56 12 39 48 10 38 37 -0.84 -105 0 0 11 8 34 3 2 0.5 3 120 -22 11 51 23 10 26 29 12 9 13 10 9 20 -0.97 -104 0 0 10 40 5 3 1 59.3 4 121 -23 11 22 27 9 58 25 11 40 6 9 41 27 -1.04 -103 0 0 10 13 0 3 1 57.8 6 121 -24 10 54 57 9 31 43 11 12 25 9 14 55 -1.08 -102 0 0 9 47 17 3 1 56.0 7 121 -25 10 28 50 9 6 22 10 46 9 8 49 43 -1.10 -101 0 0 9 22 54 3 1 53.9 8 121 -26 10 4 6 8 42 21 10 21 16 8 25 50 -1.12 -100 0 0 8 59 52 3 1 51.5 9 121 -27 9 40 43 8 19 38 9 57 43 8 3 14 -1.13 - 99 0 0 8 38 7 3 1 48.9 10 121 -28 9 18 39 7 58 11 9 35 31 7 41 55 -1.14 - 98 0 0 8 17 39 3 1 45.9 11 122 -29 8 57 53 7 38 0 9 14 38 7 21 51 -1.15 - 97 0 0 7 58 26 3 1 42.7 12 122 -30 8 38 24 7 19 4 8 55 1 7 3 1 -1.16 - 96 0 0 7 40 29 3 1 39.2 13 122 -31 8 20 10 7 1 21 8 36 41 6 45 24 -1.16 - 95 0 0 7 23 45 3 1 35.5 14 122 -32 8 3 12 6 44 51 8 19 37 6 28 59 -1.16 - 94 0 0 7 8 13 3 1 31.5 15 122 -33 7 47 27 6 29 32 8 3 46 6 13 46 -1.17 - 93 0 0 6 53 53 3 1 27.3 16 123 -34 7 32 55 6 15 24 7 49 9 5 59 42 -1.17 - 92 0 0 6 40 44 3 1 22.8 17 123 -35 7 19 34 6 2 26 7 35 44 5 46 49 -1.17 - 91 0 0 6 28 45 3 1 18.1 17 123 -36 7 7 25 5 50 37 7 23 30 5 35 4 -1.17 - 90 0 0 6 17 56 3 1 13.2 18 123 -37 6 56 27 5 39 57 7 12 28 5 24 27 -1.18 - 89 0 0 6 8 15 3 1 8.1 19 124 -38 6 46 38 5 30 24 7 2 35 5 14 57 -1.18 - 88 0 0 5 59 43 3 1 2.8 20 124 -38 6 37 57 5 21 59 6 53 52 5 6 35 -1.18 - 87 0 0 5 52 18 3 0 57.2 21 124 -39 6 30 26 5 14 40 6 46 17 4 59 19 -1.18 - 86 0 0 5 46 0 3 0 51.4 22 124 -40 6 24 2 5 8 28 6 39 51 4 53 9 -1.18 - 85 0 0 5 40 49 3 0 45.5 23 125 -41 6 18 46 5 3 22 6 34 33 4 48 5 -1.18 - 84 0 0 5 36 44 3 0 39.3 24 125 -42 6 14 38 4 59 21 6 30 23 4 44 5 -1.18 - 83 0 0 5 33 46 3 0 32.9 24 125 -43 6 11 36 4 56 25 6 27 19 4 41 11 -1.18 - 82 0 0 5 31 52 3 0 26.4 25 126 -43 6 9 40 4 54 34 6 25 23 4 39 21 -1.18 - 81 0 0 5 31 5 3 0 19.6 26 126 -44 6 8 51 4 53 48 6 24 33 4 38 35 -1.18 - 80 0 0 5 31 22 3 0 12.7 27 126 -45 6 9 8 4 54 7 6 24 50 4 38 54 -1.18 - 79 0 0 5 32 45 3 0 5.6 28 127 -46 6 10 31 4 55 29 6 26 12 4 40 17 -1.18 - 78 0 0 5 35 13 2 59 58.3 28 127 -46 6 12 59 4 57 56 6 28 41 4 42 44 -1.18 - 77 0 0 5 38 46 2 59 50.8 29 128 -47 6 16 34 5 1 27 6 32 16 4 46 14 -1.18 - 76 0 0 5 43 23 2 59 43.1 30 128 -48 6 21 14 5 6 2 6 36 57 4 50 48 -1.18 - 75 0 0 5 49 6 2 59 35.3 30 129 -48 6 27 0 5 11 42 6 42 45 4 56 27 -1.18 - 74 0 0 5 55 54 2 59 27.3 31 129 -49 6 33 52 5 18 26 6 49 39 5 3 9 -1.18 - 73 0 0 6 3 47 2 59 19.1 32 130 -49 6 41 50 5 26 15 6 57 39 5 10 56 -1.18 - 72 0 0 6 12 46 2 59 10.8 32 130 -50 6 50 54 5 35 8 7 6 46 5 19 47 -1.18 - 71 0 0 6 22 50 2 59 2.3 33 131 -51 7 1 5 5 45 6 7 16 59 5 29 42 -1.18 - 70 0 0 6 34 0 2 58 53.7 34 131 -51 7 12 23 5 56 9 7 28 20 5 40 42 -1.18 - 69 0 0 6 46 17 2 58 44.8 34 132 -52 7 24 47 6 8 17 7 40 48 5 52 48 -1.18 - 68 0 0 6 59 39 2 58 35.9 35 133 -52 7 38 19 6 21 31 7 54 23 6 5 58 -1.18 - 67 0 0 7 14 9 2 58 26.7 35 133 -52 7 52 59 6 35 52 8 9 7 6 20 14 -1.19 - 66 0 0 7 29 46 2 58 17.5 36 134 -53 8 8 47 6 51 18 8 25 0 6 35 37 -1.19 - 65 0 0 7 46 31 2 58 8.0 36 135 -53 8 25 44 7 7 52 8 42 2 6 52 6 -1.19 - 64 0 0 8 4 25 2 57 58.5 37 136 -53 8 43 50 7 25 33 9 0 14 7 9 42 -1.19 - 63 0 0 8 23 28 2 57 48.7 37 136 -54 9 3 7 7 44 22 9 19 37 7 28 26 -1.19 - 62 0 0 8 43 40 2 57 38.9 38 137 -54 9 23 34 8 4 20 9 40 10 7 48 19 -1.19 - 61 0 0 9 5 2 2 57 28.9 38 138 -54 9 45 13 8 25 28 10 1 56 8 9 20 -1.19 - 60 0 0 9 27 36 2 57 18.7 38 139 -54 10 8 3 8 47 45 10 24 54 8 31 31 -1.19 - 59 0 0 9 51 22 2 57 8.5 39 140 -54 10 32 7 9 11 13 10 49 5 8 54 52 -1.19 - 58 0 0 10 16 20 2 56 58.0 39 141 -54 10 57 25 9 35 53 11 14 31 9 19 25 -1.19 - 57 0 0 10 42 32 2 56 47.5 39 142 -54 11 23 57 10 1 46 11 41 12 9 45 9 -1.19 - 56 0 0 11 9 59 2 56 36.8 39 143 -54 11 51 46 10 28 51 12 9 10 10 12 7 -1.19 - 55 0 0 11 38 41 2 56 26.1 40 144 -54 12 20 51 10 57 11 12 38 25 10 40 18 -1.19 - 54 0 0 12 8 40 2 56 15.2 40 145 -54 12 51 15 11 26 47 13 9 0 11 9 44 -1.19 - 53 0 0 12 39 56 2 56 4.2 40 146 -54 13 22 58 11 57 38 13 40 54 11 40 25 -1.20 - 52 0 0 13 12 32 2 55 53.0 40 147 -53 13 56 1 12 29 48 14 14 9 12 12 24 -1.20 - 51 0 0 13 46 28 2 55 41.8 40 148 -53 14 30 27 13 3 16 14 48 47 12 45 41 -1.20 - 50 0 0 14 21 46 2 55 30.5 40 149 -53 15 6 16 13 38 4 15 24 50 13 20 17 -1.20 - 49 0 0 14 58 26 2 55 19.1 40 151 -52 15 43 30 14 14 13 16 2 18 13 56 14 -1.20 - 48 0 0 15 36 32 2 55 7.6 40 152 -52 16 22 10 14 51 45 16 41 14 14 33 33 -1.20 - 47 0 0 16 16 3 2 54 56.0 39 153 -51 17 2 19 15 30 42 17 21 39 15 12 16 -1.20 - 46 0 0 16 57 3 2 54 44.3 39 154 -51 17 43 58 16 11 4 18 3 35 15 52 23 -1.21 - 45 0 0 17 39 32 2 54 32.6 39 155 -50 18 27 10 16 52 53 18 47 4 16 33 57 -1.21 - 44 0 0 18 23 33 2 54 20.8 39 157 -49 19 11 55 17 36 12 19 32 9 17 17 0 -1.21 - 43 0 0 19 9 7 2 54 9.0 38 158 -49 19 58 17 18 21 2 20 18 52 18 1 32 -1.21 - 42 0 0 19 56 18 2 53 57.1 38 159 -48 20 46 18 19 7 25 21 7 15 18 47 36 -1.21 - 41 0 0 20 45 6 2 53 45.2 38 160 -47 21 36 1 19 55 23 21 57 21 19 35 14 -1.22 - 40 0 0 21 35 35 2 53 33.3 37 161 -46 22 27 27 20 44 58 22 49 13 20 24 28 -1.22 - 39 0 0 22 27 46 2 53 21.3 36 163 -45 23 20 41 21 36 12 23 42 53 21 15 20 -1.22 - 38 0 0 23 21 44 2 53 9.4 36 164 -44 24 15 45 22 29 9 24 38 26 22 7 53 -1.22 - 37 0 0 24 17 31 2 52 57.5 35 165 -43 25 12 43 23 23 50 25 35 55 23 2 9 -1.23 - 36 0 0 25 15 10 2 52 45.6 34 166 -42 26 11 38 24 20 19 26 35 24 23 58 10 -1.23 - 35 0 0 26 14 44 2 52 33.7 34 167 -41 27 12 35 25 18 38 27 36 57 24 56 0 -1.23 - 34 0 0 27 16 18 2 52 21.9 33 168 -40 28 15 38 26 18 51 28 40 40 25 55 42 -1.23 - 33 0 0 28 19 56 2 52 10.2 32 169 -39 29 20 53 27 21 2 29 46 38 26 57 19 -1.24 - 32 0 0 29 25 43 2 51 58.6 31 170 -37 30 28 25 28 25 13 30 54 57 28 0 54 -1.24 - 31 0 0 30 33 43 2 51 47.1 30 171 -36 31 38 20 29 31 31 32 5 44 29 6 32 -1.24 - 30 0 0 31 44 3 2 51 35.7 29 173 -35 32 50 47 30 39 59 33 19 7 30 14 17 -1.25 - 29 0 0 32 56 49 2 51 24.5 28 174 -33 34 5 52 31 50 42 34 35 15 31 24 14 -1.25 - 28 0 0 34 12 9 2 51 13.5 27 175 -32 35 23 46 33 3 47 35 54 19 32 36 28 -1.25 - 27 0 0 35 30 11 2 51 2.7 26 176 -31 36 44 40 34 19 20 37 16 33 33 51 6 -1.26 - 26 0 0 36 51 5 2 50 52.2 24 177 -29 38 8 48 35 37 29 38 42 11 35 8 14 -1.26 - 25 0 0 38 15 4 2 50 41.9 23 177 -28 39 36 27 36 58 23 40 11 33 36 27 59 -1.26 - 24 0 0 39 42 21 2 50 32.0 22 178 -26 41 7 56 38 22 12 41 45 2 37 50 32 -1.27 - 23 0 0 41 13 15 2 50 22.4 20 179 -24 42 43 42 39 49 8 43 23 10 39 16 2 -1.28 - 22 0 0 42 48 7 2 50 13.2 18 180 -23 44 24 18 41 19 26 45 6 37 40 44 43 -1.28 - 21 0 0 44 27 25 2 50 4.5 17 181 -21 46 10 30 42 53 25 46 56 19 42 16 50 -1.29 - 20 0 0 46 11 46 2 49 56.3 15 182 -19 48 3 21 44 31 28 48 53 39 43 52 43 -1.30 - 19 0 0 48 2 0 2 49 48.7 13 183 -17 50 4 26 46 14 4 51 0 45 45 32 45 -1.31 - 18 0 0 49 59 21 2 49 41.7 11 184 -15 52 16 16 48 1 53 53 21 14 47 17 30 -1.33 - 17 0 0 52 5 38 2 49 35.6 9 184 -13 54 43 23 49 55 50 56 2 27 49 7 39 -1.36 - 16 0 0 54 23 56 2 49 30.4 7 185 -10 57 35 44 51 57 17 59 24 43 51 4 14 -1.43 - 15 0 0 57 0 11 2 49 26.5 4 186 -8 .. .. .. 54 8 21 .. .. .. 53 8 44 -1.59 - 14 0 0 60 9 7 2 49 24.5 1 187 -5 .. .. .. 56 32 42 .. .. .. 55 23 38 -3.30 - 13 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 59 17 57 .. .. .. 57 53 19 .... - 12 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 60 47 34 .... Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 306-279051 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 26 03.1529 DE: -28 59 58.355 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 26 03.1530 DE: -28 59 58.355 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (579) Sidonia asteroid class: approx. diameter [km]: 89 approx. diameter ["]: 0.068 distance from Earth [AU]: 1.80540 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#67 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): 0.028", 0.002", 84° remarks: * orbital elements for (579)Sidonia : Mean anomaly = 347.0698341040 deg Arg. of pericenter = 229.1096494227 deg Long. of node = 82.6226756906 deg Inclination = 11.0172600463 deg Eccentricity = 0.0766019350 Semimajor axis = 3.0129248914 AU Perihelion dist = 2.7821290147 AU Mag: H = 7.93, G = 0.15 Epoch of elements : MJD 60499.12201604 TDT (2024 Jul 08.1220) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#672023Apr24,8.24,2024,7,8,2.928379,-0.447673,0.623720,-4.929977,-3.538230,-0.001668,0.000496,0.000001,0.000000 -23.5915,-28.9185,137.36,22.42,False UCAC4 306-279051,20.43420915,-28.9995429,12.45,11.95,11.68,0.0,0,,20.45958887,-28.9184528,0.75,0.66,0,0,0 579,Sidonia,11.94,88.538,1.8054,0,0,-1.829,-17.23,,6.0,0 0,347.0468,2024,7,8,229.1096,82.6227,11.0173,0.07660,3.01292,2.78213,7.93,5.0,0.15 1.206,0.0280,0.0015,84,0.0139,Known errors,0.93,0,-1,-1 20240708_279051,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org