IOTA/IOTA-ES occultation update for (7) Iris / UCAC4 397-126358 event on 2024 Oct 28, 02:55 UT Visible from Summary ------- On 2024 Oct 28 UT, the 222.325 km diameter asteroid (7) Iris will occult a 11.9 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.12 mag to 9.58 mag (the magnitude of the asteroid) for at most 15.930 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: 2024 Oct 28, 02:47 - 2024 Oct 28, 03:02 * geocentric midpoint of event [JD]: 2460611.62177558 * magnitude of target star: 11.89 * magnitude drop [mag]: 0.12 * estimated maximum duration [s]: 15.930 * Moon: 16 % sunlit, 143° distance * Sun: 97° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 235 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.011", 69°) * approx speed of asteroid's shadow [km/s]: 13.9525 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 397-126358 by 7 Iris on 2024 Oct 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 146 0 0 .. .. .... .. .. .. .. .. .. 10 0 51 .. .. .. 9 52 32 .. .. .. .... 147 0 0 10 54 14 2 48 9.7 1 101 63 9 49 34 11 59 21 9 41 15 12 7 46 .... 148 0 0 10 43 5 2 48 9.9 2 101 62 9 38 26 11 48 9 9 30 8 11 56 34 -0.22 149 0 0 10 32 5 2 48 10.3 3 101 62 9 27 28 11 37 7 9 19 10 11 45 32 -0.26 150 0 0 10 21 15 2 48 10.8 4 102 62 9 16 40 11 26 15 9 8 22 11 34 40 -0.28 151 0 0 10 10 35 2 48 11.5 5 102 61 9 6 2 11 15 34 8 57 44 11 23 58 -0.29 152 0 0 10 0 6 2 48 12.3 6 102 61 8 55 34 11 5 3 8 47 17 11 13 26 -0.30 153 0 0 9 49 47 2 48 13.2 7 102 60 8 45 17 10 54 42 8 37 1 11 3 6 -0.31 154 0 0 9 39 39 2 48 14.3 8 102 60 8 35 11 10 44 32 8 26 55 10 52 56 -0.31 155 0 0 9 29 43 2 48 15.6 9 102 59 8 25 17 10 34 34 8 17 0 10 42 57 -0.32 156 0 0 9 19 57 2 48 17.0 10 103 59 8 15 33 10 24 46 8 7 17 10 33 9 -0.32 157 0 0 9 10 23 2 48 18.5 11 103 58 8 6 1 10 15 11 7 57 45 10 23 33 -0.32 158 0 0 9 1 1 2 48 20.2 12 103 57 7 56 41 10 5 46 7 48 25 10 14 9 -0.32 159 0 0 8 51 51 2 48 22.1 13 103 57 7 47 32 9 56 34 7 39 17 10 4 57 -0.33 160 0 0 8 42 53 2 48 24.1 14 103 56 7 38 36 9 47 34 7 30 21 9 55 56 -0.33 161 0 0 8 34 7 2 48 26.2 15 104 55 7 29 52 9 38 47 7 21 37 9 47 9 -0.33 162 0 0 8 25 33 2 48 28.5 16 104 55 7 21 20 9 30 12 7 13 5 9 38 33 -0.33 163 0 0 8 17 13 2 48 30.9 17 104 54 7 13 1 9 21 49 7 4 47 9 30 11 -0.33 164 0 0 8 9 5 2 48 33.5 18 104 53 7 4 55 9 13 40 6 56 41 9 22 1 -0.33 165 0 0 8 1 10 2 48 36.2 19 104 52 6 57 2 9 5 43 6 48 48 9 14 4 -0.33 166 0 0 7 53 29 2 48 39.0 20 104 52 6 49 22 8 58 0 6 41 8 9 6 21 -0.33 167 0 0 7 46 0 2 48 42.0 21 105 51 6 41 56 8 50 30 6 33 42 8 58 51 -0.33 168 0 0 7 38 46 2 48 45.1 22 105 50 6 34 43 8 43 14 6 26 29 8 51 34 -0.34 169 0 0 7 31 45 2 48 48.4 23 105 49 6 27 43 8 36 12 6 19 30 8 44 32 -0.34 170 0 0 7 24 58 2 48 51.8 24 105 48 6 20 58 8 29 23 6 12 45 8 37 43 -0.34 171 0 0 7 18 25 2 48 55.4 25 105 48 6 14 26 8 22 49 6 6 13 8 31 8 -0.34 172 0 0 7 12 6 2 48 59.1 26 106 47 6 8 8 8 16 28 5 59 56 8 24 48 -0.34 173 0 0 7 6 1 2 49 2.9 27 106 46 6 2 5 8 10 22 5 53 53 8 18 42 -0.34 174 0 0 7 0 11 2 49 6.9 28 106 45 5 56 16 8 4 31 5 48 4 8 12 50 -0.34 175 0 0 6 54 36 2 49 10.9 29 106 44 5 50 42 7 58 54 5 42 30 8 7 13 -0.34 176 0 0 6 49 15 2 49 15.2 30 107 43 5 45 22 7 53 32 5 37 10 8 1 50 -0.34 177 0 0 6 44 8 2 49 19.5 31 107 43 5 40 17 7 48 24 5 32 5 7 56 43 -0.34 178 0 0 6 39 17 2 49 24.0 32 107 42 5 35 27 7 43 32 5 27 15 7 51 51 -0.34 179 0 0 6 34 41 2 49 28.6 33 107 41 5 30 52 7 38 55 5 22 40 7 47 13 -0.34 -180 0 0 6 30 20 2 49 33.3 34 108 40 5 26 32 7 34 33 5 18 21 7 42 51 -0.34 -179 0 0 6 26 14 2 49 38.2 35 108 39 5 22 27 7 30 26 5 14 16 7 38 44 -0.34 -178 0 0 6 22 24 2 49 43.2 36 108 38 5 18 37 7 26 35 5 10 26 7 34 53 -0.34 -177 0 0 6 18 49 2 49 48.3 37 108 37 5 15 3 7 22 59 5 6 52 7 31 17 -0.34 -176 0 0 6 15 29 2 49 53.5 38 109 36 5 11 44 7 19 38 5 3 33 7 27 56 -0.34 -175 0 0 6 12 25 2 49 58.9 39 109 35 5 8 41 7 16 34 5 0 30 7 24 52 -0.34 -174 0 0 6 9 37 2 50 4.3 40 109 34 5 5 54 7 13 45 4 57 43 7 22 3 -0.34 -173 0 0 6 7 4 2 50 9.9 41 110 33 5 3 22 7 11 12 4 55 11 7 19 29 -0.34 -172 0 0 6 4 48 2 50 15.6 42 110 32 5 1 5 7 8 55 4 52 55 7 17 12 -0.34 -171 0 0 6 2 47 2 50 21.4 43 111 31 4 59 5 7 6 53 4 50 54 7 15 11 -0.34 -170 0 0 6 1 2 2 50 27.3 44 111 31 4 57 20 7 5 8 4 49 10 7 13 26 -0.34 -169 0 0 5 59 33 2 50 33.3 45 111 30 4 55 52 7 3 39 4 47 41 7 11 56 -0.34 -168 0 0 5 58 20 2 50 39.4 46 112 29 4 54 39 7 2 26 4 46 29 7 10 43 -0.34 -167 0 0 5 57 23 2 50 45.6 47 112 28 4 53 43 7 1 29 4 45 32 7 9 46 -0.35 -166 0 0 5 56 43 2 50 51.9 48 113 27 4 53 2 7 0 48 4 44 51 7 9 6 -0.35 -165 0 0 5 56 18 2 50 58.3 48 113 26 4 52 37 7 0 24 4 44 27 7 8 41 -0.35 -164 0 0 5 56 10 2 51 4.8 49 114 25 4 52 29 7 0 15 4 44 18 7 8 33 -0.35 -163 0 0 5 56 18 2 51 11.5 50 115 24 4 52 37 7 0 23 4 44 26 7 8 41 -0.35 -162 0 0 5 56 42 2 51 18.2 51 115 23 4 53 0 7 0 48 4 44 50 7 9 5 -0.35 -161 0 0 5 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43 20 9 8 49 -0.35 -133 0 0 8 3 45 2 55 0.9 71 164 -6 6 59 29 9 8 26 6 51 14 9 16 47 -0.35 -132 0 0 8 11 55 2 55 9.2 71 167 -8 7 7 38 9 16 38 6 59 22 9 25 0 -0.35 -131 0 0 8 20 19 2 55 17.4 71 171 -9 7 16 0 9 25 4 7 7 44 9 33 26 -0.35 -130 0 0 8 28 57 2 55 25.7 71 174 -10 7 24 36 9 33 44 7 16 20 9 42 7 -0.35 -129 0 0 8 37 49 2 55 33.9 71 177 -11 7 33 25 9 42 37 7 25 9 9 51 0 -0.35 -128 0 0 8 46 54 2 55 42.1 71 180 -12 7 42 28 9 51 44 7 34 12 10 0 8 -0.35 -127 0 0 8 56 12 2 55 50.4 70 183 -13 7 51 44 10 1 5 7 43 28 10 9 28 -0.35 -126 0 0 9 5 43 2 55 58.6 70 186 -14 8 1 13 10 10 38 7 52 56 10 19 1 -0.35 -125 0 0 9 15 27 2 56 6.8 70 189 -15 8 10 55 10 20 24 8 2 38 10 28 48 -0.35 -124 0 0 9 25 23 2 56 15.0 70 192 -16 8 20 49 10 30 22 8 12 32 10 38 47 -0.35 -123 0 0 9 35 32 2 56 23.2 69 194 -17 8 30 56 10 40 33 8 22 39 10 48 58 -0.35 -122 0 0 9 45 53 2 56 31.3 69 197 -18 8 41 15 10 50 56 8 32 57 10 59 21 -0.35 -121 0 0 9 56 26 2 56 39.5 68 199 -19 8 51 46 11 1 31 8 43 28 11 9 57 -0.35 -120 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234 -45 14 20 51 16 32 8 14 12 27 16 40 39 -0.34 - 94 0 0 15 40 29 2 59 57.6 46 235 -46 14 35 3 16 46 21 14 26 39 16 54 52 -0.34 - 93 0 0 15 54 45 3 0 3.8 46 236 -47 14 49 18 17 0 39 14 40 54 17 9 10 -0.34 - 92 0 0 16 9 5 3 0 9.8 45 236 -48 15 3 37 17 14 59 14 55 13 17 23 31 -0.34 - 91 0 0 16 23 28 3 0 15.8 44 237 -49 15 17 59 17 29 23 15 9 35 17 37 55 -0.34 - 90 0 0 16 37 54 3 0 21.6 43 238 -50 15 32 24 17 43 50 15 24 0 17 52 22 -0.34 - 89 0 0 16 52 22 3 0 27.4 42 238 -51 15 46 52 17 58 19 15 38 27 18 6 51 -0.34 - 88 0 0 17 6 53 3 0 33.0 41 239 -52 16 1 22 18 12 51 15 52 57 18 21 22 -0.34 - 87 0 0 17 21 26 3 0 38.5 40 239 -53 16 15 54 18 27 24 16 7 29 18 35 56 -0.34 - 86 0 0 17 35 59 3 0 43.9 39 240 -54 16 30 27 18 41 58 16 22 2 18 50 30 -0.34 - 85 0 0 17 50 35 3 0 49.1 38 240 -55 16 45 2 18 56 34 16 36 37 19 5 6 -0.34 - 84 0 0 18 5 11 3 0 54.3 37 241 -56 16 59 38 19 11 10 16 51 13 19 19 42 -0.34 - 83 0 0 18 19 47 3 0 59.3 36 241 -57 17 14 14 19 25 47 17 5 49 19 34 19 -0.34 - 82 0 0 18 34 24 3 1 4.2 35 242 -58 17 28 51 19 40 24 17 20 26 19 48 56 -0.34 - 81 0 0 18 49 1 3 1 8.9 34 242 -59 17 43 27 19 55 1 17 35 2 20 3 33 -0.34 - 80 0 0 19 3 37 3 1 13.6 33 243 -60 17 58 3 20 9 37 17 49 38 20 18 9 -0.34 - 79 0 0 19 18 12 3 1 18.1 32 243 -61 18 12 39 20 24 12 18 4 14 20 32 44 -0.34 - 78 0 0 19 32 47 3 1 22.5 31 244 -62 18 27 14 20 38 46 18 18 49 20 47 19 -0.34 - 77 0 0 19 47 20 3 1 26.7 30 244 -63 18 41 47 20 53 19 18 33 22 21 1 51 -0.34 - 76 0 0 20 1 51 3 1 30.8 29 245 -64 18 56 18 21 7 50 18 47 54 21 16 23 -0.34 - 75 0 0 20 16 21 3 1 34.8 28 245 -65 19 10 48 21 22 20 19 2 23 21 30 52 -0.34 - 74 0 0 20 30 48 3 1 38.7 27 246 -65 19 25 16 21 36 46 19 16 51 21 45 18 -0.34 - 73 0 0 20 45 12 3 1 42.4 26 246 -66 19 39 41 21 51 10 19 31 16 21 59 42 -0.34 - 72 0 0 20 59 34 3 1 46.0 25 246 -67 19 54 3 22 5 31 19 45 38 22 14 3 -0.34 - 71 0 0 21 13 52 3 1 49.4 24 247 -68 20 8 22 22 19 49 19 59 58 22 28 21 -0.34 - 70 0 0 21 28 7 3 1 52.8 23 247 -69 20 22 38 22 34 3 20 14 13 22 42 35 -0.34 - 69 0 0 21 42 19 3 1 56.0 22 248 -70 20 36 50 22 48 14 20 28 26 22 56 45 -0.34 - 68 0 0 21 56 26 3 1 59.0 21 248 -70 20 50 58 23 2 20 20 42 34 23 10 51 -0.34 - 67 0 0 22 10 29 3 2 1.9 21 249 -71 21 5 2 23 16 22 20 56 38 23 24 53 -0.34 - 66 0 0 22 24 27 3 2 4.7 20 249 -72 21 19 1 23 30 19 21 10 37 23 38 50 -0.34 - 65 0 0 22 38 20 3 2 7.4 19 249 -73 21 32 56 23 44 12 21 24 32 23 52 43 -0.34 - 64 0 0 22 52 9 3 2 9.9 18 250 -73 21 46 45 23 57 59 21 38 21 24 6 30 -0.34 - 63 0 0 23 5 52 3 2 12.3 17 250 -74 22 0 29 24 11 40 21 52 6 24 20 11 -0.35 - 62 0 0 23 19 29 3 2 14.5 16 251 -75 22 14 8 24 25 17 22 5 44 24 33 47 -0.35 - 61 0 0 23 33 1 3 2 16.6 15 251 -75 22 27 41 24 38 47 22 19 17 24 47 17 -0.35 - 60 0 0 23 46 26 3 2 18.6 14 252 -76 22 41 7 24 52 11 22 32 44 25 0 41 -0.35 - 59 0 0 23 59 45 3 2 20.5 13 252 -76 22 54 28 25 5 28 22 46 5 25 13 58 -0.35 - 58 0 0 24 12 58 3 2 22.2 12 252 -76 23 7 42 25 18 39 22 59 19 25 27 9 -0.35 - 57 0 0 24 26 3 3 2 23.8 11 253 -77 23 20 49 25 31 44 23 12 27 25 40 13 -0.35 - 56 0 0 24 39 2 3 2 25.2 10 253 -77 23 33 49 25 44 41 23 25 27 25 53 10 -0.35 - 55 0 0 24 51 53 3 2 26.5 9 254 -77 23 46 42 25 57 30 23 38 20 26 6 0 -0.35 - 54 0 0 25 4 37 3 2 27.7 8 254 -77 23 59 28 26 10 13 23 51 6 26 18 42 -0.35 - 53 0 0 25 17 14 3 2 28.8 7 255 -78 24 12 6 26 22 47 24 3 44 26 31 16 -0.35 - 52 0 0 25 29 42 3 2 29.7 6 255 -78 24 24 36 26 35 14 24 16 15 26 43 43 -0.35 - 51 0 0 25 42 3 3 2 30.5 5 255 -77 24 36 59 26 47 33 24 28 37 26 56 1 -0.36 - 50 0 0 25 54 15 3 2 31.2 4 256 -77 24 49 13 26 59 43 24 40 52 27 8 11 -0.36 - 49 0 0 26 6 19 3 2 31.7 4 256 -77 25 1 18 27 11 45 24 52 58 27 20 13 -0.36 - 48 0 0 26 18 14 3 2 32.1 3 257 -77 25 13 15 27 23 38 25 4 55 27 32 6 -0.37 - 47 0 0 26 30 1 3 2 32.4 2 257 -77 25 25 4 27 35 23 25 16 43 27 43 50 -0.39 - 46 0 0 26 41 38 3 2 32.6 1 258 -76 25 36 43 27 46 59 25 28 23 27 55 26 -0.44 - 45 0 0 .. .. .... .. .. .. .. .. .. 25 48 14 .. .. .. 25 39 54 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 397-126358 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 50 18.7250 DE: -10 45 58.283 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 50 18.7248 DE: -10 45 58.284 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7) Iris asteroid class: approx. diameter [km]: 222 approx. diameter ["]: 0.183 distance from Earth [AU]: 1.67890 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#126 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): 0.021", 0.011", 68.828° remarks: * orbital elements for (7)Iris : Mean anomaly = 317.7310820543 deg Arg. of pericenter = 145.5214924592 deg Long. of node = 259.4990216289 deg Inclination = 5.5194816129 deg Eccentricity = 0.2298602646 Semimajor axis = 2.3860386678 AU Perihelion dist = 1.8375831884 AU Mag: H = 5.63, G = 0.15 Epoch of elements : MJD 60611.12177554 TDT (2024 Oct 28.1218) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1262023Apr24,15.93,2024,10,28,2.922614,-0.045574,0.325778,7.798599,1.095625,0.005206,0.001390,0.000000,0.000000 -127.8757,-10.6737,132.11,-13.25,False UCAC4 397-126358,20.83853474,-10.7661896,12.17,11.89,11.74,0.0,0,,20.86102166,-10.6736889,0.12,0.09,0,0,0 7,Iris,9.58,222.325,1.6789,0,0,2.772,5.74,,15.2,0 0,317.6985,2024,10,28,145.5215,259.4990,5.5195,0.22986,2.38604,1.83758,5.63,5.0,0.15 1.064,0.0213,0.0110,69,0.0118,Known errors,0.94,0,-1,-1 20241028_126358,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org