IOTA/IOTA-ES occultation update for (7) Iris / TYC 5758-01212-1 event on 2024 Sep 12, 04:03 UT Visible from Summary ------- On 2024 Sep 12 UT, the 222.252325394972 km diameter asteroid (7) Iris will occult a 9.4 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.53 mag to 8.87 mag (the magnitude of the asteroid) for at most 63.360 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 Sep 12, 03:33 - 2024 Sep 12, 04:33 * geocentric midpoint of event [JD]: 2460565.66890183 * magnitude of target star: 9.36 * magnitude drop [mag]: 0.53 * estimated maximum duration [s]: 63.360 * Moon: 59 % sunlit, 39° distance * Sun: 137° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 230 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 7.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.017) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.014", 69°) * approx speed of asteroid's shadow [km/s]: 3.5105 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5758-01212-1 by 7 Iris on 2024 Sep 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 155 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -16 2 2 .. .. .. -16 10 12 .... 156 0 0 -15 9 6 4 32 28.8 1 101 41 -14 5 5 -16 12 45 -13 56 49 -16 20 55 .... 157 0 0 -15 19 23 4 32 28.1 2 100 40 -14 15 29 -16 22 54 -14 7 15 -16 31 3 -0.18 158 0 0 -15 29 5 4 32 26.8 3 100 40 -14 25 19 -16 32 29 -14 17 5 -16 40 37 -0.22 159 0 0 -15 38 13 4 32 25.0 4 100 39 -14 34 34 -16 41 30 -14 26 21 -16 49 37 -0.24 160 0 0 -15 46 47 4 32 22.7 5 99 38 -14 43 15 -16 49 58 -14 35 3 -16 58 4 -0.25 161 0 0 -15 54 47 4 32 19.8 6 99 37 -14 51 21 -16 57 52 -14 43 10 -17 5 57 -0.25 162 0 0 -16 2 13 4 32 16.5 7 99 36 -14 58 54 -17 5 13 -14 50 44 -17 13 17 -0.26 163 0 0 -16 9 7 4 32 12.6 8 99 35 -15 5 53 -17 12 1 -14 57 43 -17 20 5 -0.26 164 0 0 -16 15 27 4 32 8.2 8 98 34 -15 12 19 -17 18 16 -15 4 10 -17 26 20 -0.26 165 0 0 -16 21 15 4 32 3.4 9 98 33 -15 18 11 -17 23 59 -15 10 3 -17 32 2 -0.26 166 0 0 -16 26 31 4 31 58.0 10 98 32 -15 23 31 -17 29 10 -15 15 23 -17 37 13 -0.27 167 0 0 -16 31 14 4 31 52.2 11 98 31 -15 28 18 -17 33 50 -15 20 11 -17 41 51 -0.27 168 0 0 -16 35 25 4 31 45.9 12 97 30 -15 32 33 -17 37 57 -15 24 27 -17 45 58 -0.27 169 0 0 -16 39 4 4 31 39.2 13 97 29 -15 36 16 -17 41 33 -15 28 10 -17 49 34 -0.27 170 0 0 -16 42 12 4 31 32.0 14 97 28 -15 39 27 -17 44 38 -15 31 21 -17 52 38 -0.27 171 0 0 -16 44 48 4 31 24.3 15 97 27 -15 42 6 -17 47 12 -15 34 0 -17 55 12 -0.27 172 0 0 -16 46 54 4 31 16.1 16 96 27 -15 44 13 -17 49 15 -15 36 8 -17 57 15 -0.27 173 0 0 -16 48 28 4 31 7.5 17 96 26 -15 45 50 -17 50 47 -15 37 45 -17 58 47 -0.27 174 0 0 -16 49 31 4 30 58.5 18 96 25 -15 46 55 -17 51 49 -15 38 50 -17 59 48 -0.26 175 0 0 -16 50 4 4 30 49.0 19 96 24 -15 47 29 -17 52 21 -15 39 25 -18 0 20 -0.26 176 0 0 -16 50 7 4 30 39.1 20 95 23 -15 47 33 -17 52 22 -15 39 29 -18 0 21 -0.26 177 0 0 -16 49 39 4 30 28.8 21 95 22 -15 47 6 -17 51 54 -15 39 2 -17 59 53 -0.26 178 0 0 -16 48 41 4 30 18.0 21 95 21 -15 46 8 -17 50 55 -15 38 4 -17 58 54 -0.26 179 0 0 -16 47 13 4 30 6.8 22 95 20 -15 44 41 -17 49 28 -15 36 37 -17 57 27 -0.26 -180 0 0 -16 45 16 4 29 55.2 23 94 19 -15 42 43 -17 47 30 -15 34 39 -17 55 29 -0.26 -179 0 0 -16 42 49 4 29 43.1 24 94 18 -15 40 16 -17 45 4 -15 32 12 -17 53 3 -0.26 -178 0 0 -16 39 53 4 29 30.7 25 94 18 -15 37 19 -17 42 8 -15 29 15 -17 50 7 -0.26 -177 0 0 -16 36 27 4 29 17.8 26 94 17 -15 33 52 -17 38 44 -15 25 48 -17 46 43 -0.26 -176 0 0 -16 32 32 4 29 4.5 27 93 16 -15 29 56 -17 34 50 -15 21 51 -17 42 49 -0.26 -175 0 0 -16 28 8 4 28 50.8 28 93 15 -15 25 30 -17 30 28 -15 17 26 -17 38 27 -0.26 -174 0 0 -16 23 15 4 28 36.7 29 93 14 -15 20 36 -17 25 37 -15 12 31 -17 33 37 -0.26 -173 0 0 -16 17 53 4 28 22.2 30 93 13 -15 15 12 -17 20 17 -15 7 7 -17 28 17 -0.26 -172 0 0 -16 12 3 4 28 7.3 30 93 12 -15 9 19 -17 14 29 -15 1 14 -17 22 30 -0.26 -171 0 0 -16 5 44 4 27 52.0 31 93 11 -15 2 58 -17 8 13 -14 54 52 -17 16 14 -0.25 -170 0 0 -15 58 57 4 27 36.4 32 92 11 -14 56 8 -17 1 29 -14 48 2 -17 9 30 -0.25 -169 0 0 -15 51 42 4 27 20.3 33 92 10 -14 48 49 -16 54 17 -14 40 43 -17 2 18 -0.25 -168 0 0 -15 43 58 4 27 3.8 34 92 9 -14 41 2 -16 46 36 -14 32 55 -16 54 38 -0.25 -167 0 0 -15 35 47 4 26 47.0 35 92 8 -14 32 47 -16 38 28 -14 24 40 -16 46 31 -0.25 -166 0 0 -15 27 7 4 26 29.7 36 92 7 -14 24 4 -16 29 53 -14 15 56 -16 37 56 -0.25 -165 0 0 -15 18 0 4 26 12.1 37 92 6 -14 14 52 -16 20 49 -14 6 44 -16 28 53 -0.25 -164 0 0 -15 8 24 4 25 54.1 38 92 5 -14 5 13 -16 11 18 -13 57 4 -16 19 22 -0.25 -163 0 0 -14 58 22 4 25 35.8 38 92 4 -13 55 6 -16 1 20 -13 46 56 -16 9 25 -0.25 -162 0 0 -14 47 51 4 25 17.0 39 91 4 -13 44 31 -15 50 55 -13 36 20 -15 59 0 -0.25 -161 0 0 -14 36 54 4 24 57.9 40 91 3 -13 33 28 -15 40 2 -13 25 17 -15 48 8 -0.25 -160 0 0 -14 25 29 4 24 38.4 41 91 2 -13 21 58 -15 28 42 -13 13 46 -15 36 48 -0.25 -159 0 0 -14 13 37 4 24 18.6 42 91 1 -13 10 0 -15 16 55 -13 1 48 -15 25 2 -0.25 -158 0 0 -14 1 17 4 23 58.4 43 91 0 -12 57 36 -15 4 41 -12 49 23 -15 12 49 -0.25 -157 0 0 -13 48 31 4 23 37.8 44 91 -1 -12 44 44 -14 52 1 -12 36 30 -15 0 9 -0.25 -156 0 0 -13 35 18 4 23 16.9 45 91 -2 -12 31 25 -14 38 53 -12 23 10 -14 47 3 -0.25 -155 0 0 -13 21 38 4 22 55.6 46 91 -3 -12 17 39 -14 25 20 -12 9 24 -14 33 30 -0.25 -154 0 0 -13 7 32 4 22 33.9 46 91 -3 -12 3 26 -14 11 19 -11 55 10 -14 19 30 -0.25 -153 0 0 -12 52 59 4 22 11.9 47 91 -4 -11 48 47 -13 56 53 -11 40 30 -14 5 5 -0.25 -152 0 0 -12 37 59 4 21 49.6 48 92 -5 -11 33 41 -13 42 0 -11 25 23 -13 50 12 -0.25 -151 0 0 -12 22 34 4 21 26.9 49 92 -6 -11 18 8 -13 26 41 -11 9 50 -13 34 54 -0.25 -150 0 0 -12 6 42 4 21 3.9 50 92 -7 -11 2 10 -13 10 56 -10 53 50 -13 19 10 -0.25 -149 0 0 -11 50 24 4 20 40.5 51 92 -8 -10 45 45 -12 54 45 -10 37 24 -13 3 0 -0.25 -148 0 0 -11 33 40 4 20 16.8 52 92 -9 -10 28 54 -12 38 8 -10 20 32 -12 46 25 -0.25 -147 0 0 -11 16 31 4 19 52.8 53 92 -10 -10 11 37 -12 21 6 -10 3 15 -12 29 23 -0.25 -146 0 0 -10 58 56 4 19 28.4 53 93 -10 - 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47 0 0 35 57 9 3 36 36.6 23 236 -49 37 7 28 34 47 18 37 16 33 34 38 21 -0.31 - 46 0 0 36 20 33 3 36 25.6 23 237 -49 37 30 42 35 10 53 37 39 45 35 1 57 -0.31 - 45 0 0 36 43 33 3 36 15.0 22 238 -48 37 53 31 35 34 3 38 2 33 35 25 8 -0.31 - 44 0 0 37 6 8 3 36 4.9 21 238 -48 38 15 56 35 56 49 38 24 56 35 47 56 -0.31 - 43 0 0 37 28 19 3 35 55.2 20 239 -47 38 37 55 36 19 10 38 46 55 36 10 18 -0.31 - 42 0 0 37 50 4 3 35 46.0 19 239 -47 38 59 30 36 41 6 39 8 28 36 32 16 -0.31 - 41 0 0 38 11 25 3 35 37.2 18 240 -46 39 20 39 37 2 38 39 29 35 36 53 49 -0.31 - 40 0 0 38 32 20 3 35 28.9 17 241 -45 39 41 23 37 23 44 39 50 18 37 14 57 -0.31 - 39 0 0 38 52 50 3 35 20.9 17 241 -45 40 1 42 37 44 25 40 10 35 37 35 39 -0.31 - 38 0 0 39 12 55 3 35 13.4 16 242 -44 40 21 35 38 4 41 40 30 27 37 55 57 -0.31 - 37 0 0 39 32 34 3 35 6.3 15 243 -44 40 41 2 38 24 32 40 49 53 38 15 48 -0.31 - 36 0 0 39 51 48 3 34 59.6 14 243 -43 41 0 4 38 43 56 41 8 53 38 35 15 -0.31 - 35 0 0 40 10 35 3 34 53.3 13 244 -42 41 18 40 39 2 55 41 27 28 38 54 15 -0.31 - 34 0 0 40 28 57 3 34 47.4 13 245 -42 41 36 51 39 21 29 41 45 37 39 12 50 -0.31 - 33 0 0 40 46 54 3 34 41.9 12 245 -41 41 54 36 39 39 36 42 3 20 39 30 59 -0.31 - 32 0 0 41 4 24 3 34 36.8 11 246 -41 42 11 54 39 57 18 42 20 37 39 48 42 -0.31 - 31 0 0 41 21 29 3 34 32.0 10 246 -40 42 28 48 40 14 34 42 37 29 40 6 0 -0.31 - 30 0 0 41 38 8 3 34 27.7 9 247 -39 42 45 15 40 31 24 42 53 55 40 22 51 -0.31 - 29 0 0 41 54 21 3 34 23.7 9 248 -39 43 1 17 40 47 48 43 9 55 40 39 17 -0.31 - 28 0 0 42 10 8 3 34 20.1 8 248 -38 43 16 52 41 3 47 43 25 29 40 55 16 -0.30 - 27 0 0 42 25 30 3 34 16.8 7 249 -37 43 32 3 41 19 19 43 40 38 41 10 50 -0.30 - 26 0 0 42 40 25 3 34 13.9 6 250 -37 43 46 47 41 34 26 43 55 21 41 25 58 -0.30 - 25 0 0 42 54 55 3 34 11.3 6 250 -36 44 1 6 41 49 7 44 9 39 41 40 41 -0.30 - 24 0 0 43 9 0 3 34 9.1 5 251 -36 44 15 0 42 3 22 44 23 31 41 54 57 -0.30 - 23 0 0 43 22 39 3 34 7.2 4 252 -35 44 28 28 42 17 11 44 36 57 42 8 48 -0.30 - 22 0 0 43 35 52 3 34 5.7 3 252 -34 44 41 30 42 30 35 44 49 59 42 22 12 -0.30 - 21 0 0 43 48 39 3 34 4.4 3 253 -34 44 54 8 42 43 32 45 2 35 42 35 12 -0.31 - 20 0 0 44 1 2 3 34 3.6 2 254 -33 45 6 20 42 56 5 45 14 45 42 47 45 -0.31 - 19 0 0 44 12 58 3 34 3.0 1 255 -32 45 18 7 43 8 11 45 26 31 42 59 53 -0.32 - 18 0 0 44 24 30 3 34 2.7 0 255 -32 .. .. .. 43 19 52 .. .. .. 43 11 35 -0.38 Uncertainty in time = +/- 8 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 5758-01212-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 29 46.3583 DE: -10 26 36.378 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 29 46.3583 DE: -10 26 36.379 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.4 * B mag [mag]: 10.1 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7) Iris asteroid class: approx. diameter [km]: 222 approx. diameter ["]: 0.232 distance from Earth [AU]: 1.32140 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): 0.029", 0.014", 69.361° remarks: * orbital elements for (7)Iris : Mean anomaly = 305.4465294363 deg Arg. of pericenter = 145.5158734674 deg Long. of node = 259.4989588177 deg Inclination = 5.5194811934 deg Eccentricity = 0.2298529216 Semimajor axis = 2.3860729918 AU Perihelion dist = 1.8376271435 AU Mag: H = 5.63, G = 0.15 Epoch of elements : MJD 60565.16890224 TDT (2024 Sep 12.1689) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1262023Apr24,63.36,2024,9,12,4.053644,-0.130422,0.224228,-1.712867,-0.996089,0.003656,0.000347,0.000001,0.000000 -104.6801,-10.3602,118.25,4.00,False TYC 5758-01212-1,20.49621066,-10.4434384,10.13,9.36,8.94,0.2,0,,20.51888477,-10.3601778,0.53,0.52,0,0,0 7,Iris,8.87,222.444,1.3214,0,0,-0.771,-6.63,,15.2,0 0,305.4014,2024,9,12,145.5159,259.4990,5.5195,0.22985,2.38607,1.83763,5.63,5.0,0.15 1.064,0.0287,0.0143,69,0.0149,Known errors,1.06,0,-1,-1 20240912_1212-1,60140.56 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org