IOTA/IOTA-ES occultation update for (1178) Irmela / UCAC4 366-138855 event on 2024 Sep 22, 00:23 UT Visible from Summary ------- On 2024 Sep 22 UT, the 19.043 km diameter asteroid (1178) Irmela will occult a 11.6 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 5.87 mag to 17.43 mag (the magnitude of the asteroid) for at most 1.550 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: 96 * date and approx. time of event: 2024 Sep 22, 00:15 - 2024 Sep 22, 00:32 * geocentric midpoint of event [JD]: 2460575.51660579 * magnitude of target star: 11.56 * magnitude drop [mag]: 5.87 * estimated maximum duration [s]: 1.550 * Moon: 78 % sunlit, 135° distance * Sun: 100° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.004", 92°) * approx speed of asteroid's shadow [km/s]: 12.2753 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 366-138855 by 1178 Irmela on 2024 Sep 22 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 -167 0 0 23 59 24 0 15 25.0 1 109 60 23 53 51 24 4 57 23 49 21 24 9 27 .... -166 0 0 23 40 26 0 15 25.2 2 109 60 23 34 53 23 45 59 23 30 23 23 50 30 -0.07 -165 0 0 23 21 11 0 15 25.5 3 110 59 23 15 37 23 26 44 23 11 7 23 31 15 -0.11 -164 0 0 23 1 39 0 15 26.0 4 110 59 22 56 5 23 7 13 22 51 34 23 11 44 -0.13 -163 0 0 22 41 50 0 15 26.7 5 111 59 22 36 15 22 47 24 22 31 44 22 51 56 -0.14 -162 0 0 22 21 44 0 15 27.5 6 111 58 22 16 10 22 27 19 22 11 38 22 31 51 -0.15 -161 0 0 22 1 23 0 15 28.5 7 111 58 21 55 48 22 6 58 21 51 16 22 11 30 -0.15 -160 0 0 21 40 45 0 15 29.6 8 112 57 21 35 10 21 46 21 21 30 37 21 50 54 -0.15 -159 0 0 21 19 52 0 15 30.9 9 112 56 21 14 16 21 25 28 21 9 43 21 30 1 -0.16 -158 0 0 20 58 44 0 15 32.4 10 112 56 20 53 7 21 4 20 20 48 34 21 8 54 -0.16 -157 0 0 20 37 20 0 15 34.0 11 113 55 20 31 44 20 42 57 20 27 10 20 47 31 -0.16 -156 0 0 20 15 42 0 15 35.8 12 113 55 20 10 5 20 21 20 20 5 31 20 25 54 -0.16 -155 0 0 19 53 50 0 15 37.8 13 114 54 19 48 13 19 59 28 19 43 39 20 4 2 -0.16 -154 0 0 19 31 44 0 15 40.0 14 114 53 19 26 6 19 37 22 19 21 32 19 41 57 -0.17 -153 0 0 19 9 25 0 15 42.3 15 114 53 19 3 46 19 15 3 18 59 12 19 19 38 -0.17 -152 0 0 18 46 52 0 15 44.8 16 115 52 18 41 13 18 52 31 18 36 39 18 57 6 -0.17 -151 0 0 18 24 7 0 15 47.4 17 115 51 18 18 28 18 29 46 18 13 53 18 34 21 -0.17 -150 0 0 18 1 9 0 15 50.3 18 115 51 17 55 30 18 6 49 17 50 55 18 11 24 -0.17 -149 0 0 17 38 0 0 15 53.3 19 116 50 17 32 20 17 43 40 17 27 45 17 48 16 -0.17 -148 0 0 17 14 39 0 15 56.5 20 116 49 17 9 0 17 20 19 17 4 24 17 24 55 -0.17 -147 0 0 16 51 8 0 15 59.8 21 116 48 16 45 28 16 56 48 16 40 52 17 1 25 -0.17 -146 0 0 16 27 26 0 16 3.4 22 117 48 16 21 46 16 33 7 16 17 10 16 37 43 -0.17 -145 0 0 16 3 35 0 16 7.1 23 117 47 15 57 54 16 9 16 15 53 18 16 13 52 -0.17 -144 0 0 15 39 34 0 16 11.0 24 117 46 15 33 53 15 45 15 15 29 17 15 49 52 -0.17 -143 0 0 15 15 25 0 16 15.0 25 117 45 15 9 44 15 21 6 15 5 7 15 25 43 -0.17 -142 0 0 14 51 7 0 16 19.3 26 118 44 14 45 26 14 56 48 14 40 49 15 1 26 -0.17 -141 0 0 14 26 42 0 16 23.7 27 118 43 14 21 0 14 32 23 14 16 23 14 37 1 -0.17 -140 0 0 14 2 9 0 16 28.3 28 118 43 13 56 28 14 7 51 13 51 51 14 12 29 -0.17 -139 0 0 13 37 31 0 16 33.1 29 119 42 13 31 49 13 43 12 13 27 12 13 47 50 -0.17 -138 0 0 13 12 46 0 16 38.0 30 119 41 13 7 4 13 18 28 13 2 27 13 23 6 -0.18 -137 0 0 12 47 56 0 16 43.2 32 119 40 12 42 14 12 53 38 12 37 37 12 58 16 -0.18 -136 0 0 12 23 2 0 16 48.4 33 120 39 12 17 20 12 28 44 12 12 42 12 33 22 -0.18 -135 0 0 11 58 3 0 16 53.9 34 120 38 11 52 21 12 3 45 11 47 44 12 8 23 -0.18 -134 0 0 11 33 1 0 16 59.5 35 120 37 11 27 19 11 38 44 11 22 42 11 43 22 -0.18 -133 0 0 11 7 57 0 17 5.3 36 121 36 11 2 15 11 13 39 10 57 37 11 18 17 -0.18 -132 0 0 10 42 50 0 17 11.3 37 121 35 10 37 8 10 48 32 10 32 30 10 53 10 -0.18 -131 0 0 10 17 42 0 17 17.4 38 121 34 10 12 0 10 23 24 10 7 22 10 28 2 -0.18 -130 0 0 9 52 34 0 17 23.7 39 121 33 9 46 51 9 58 16 9 42 14 10 2 54 -0.18 -129 0 0 9 27 25 0 17 30.2 40 122 32 9 21 43 9 33 7 9 17 5 9 37 45 -0.18 -128 0 0 9 2 17 0 17 36.8 41 122 31 8 56 35 9 7 59 8 51 57 9 12 36 -0.18 -127 0 0 8 37 10 0 17 43.5 42 122 30 8 31 28 8 42 52 8 26 50 8 47 29 -0.18 -126 0 0 8 12 5 0 17 50.4 43 123 29 8 6 23 8 17 47 8 1 46 8 22 24 -0.18 -125 0 0 7 47 3 0 17 57.5 44 123 28 7 41 21 7 52 44 7 36 44 7 57 22 -0.18 -124 0 0 7 22 4 0 18 4.7 46 123 27 7 16 22 7 27 45 7 11 45 7 32 22 -0.18 -123 0 0 6 57 9 0 18 12.0 47 124 26 6 51 27 7 2 50 6 46 50 7 7 27 -0.18 -122 0 0 6 32 18 0 18 19.5 48 124 25 6 26 37 6 37 59 6 22 0 6 42 37 -0.18 -121 0 0 6 7 33 0 18 27.1 49 125 24 6 1 53 6 13 14 5 57 16 6 17 51 -0.18 -120 0 0 5 42 54 0 18 34.8 50 125 23 5 37 14 5 48 35 5 32 37 5 53 12 -0.18 -119 0 0 5 18 22 0 18 42.7 51 125 22 5 12 42 5 24 3 5 8 6 5 28 39 -0.18 -118 0 0 4 53 57 0 18 50.7 52 126 21 4 48 17 4 59 38 4 43 41 5 4 14 -0.18 -117 0 0 4 29 40 0 18 58.8 53 126 20 4 24 1 4 35 20 4 19 25 4 39 56 -0.18 -116 0 0 4 5 32 0 19 7.0 54 127 19 3 59 53 4 11 12 3 55 17 4 15 48 -0.18 -115 0 0 3 41 33 0 19 15.4 55 127 18 3 35 54 3 47 13 3 31 19 3 51 48 -0.18 -114 0 0 3 17 44 0 19 23.8 56 128 17 3 12 5 3 23 23 3 7 30 3 27 58 -0.18 -113 0 0 2 54 6 0 19 32.4 57 128 16 2 48 27 2 59 44 2 43 52 3 4 19 -0.18 -112 0 0 2 30 38 0 19 41.0 58 129 15 2 25 0 2 36 17 2 20 26 2 40 51 -0.19 -111 0 0 2 7 23 0 19 49.8 59 130 14 2 1 45 2 13 1 1 57 11 2 17 35 -0.19 -110 0 0 1 44 19 0 19 58.6 60 130 13 1 38 42 1 49 57 1 34 8 1 54 31 -0.19 -109 0 0 1 21 29 0 20 7.5 61 131 12 1 15 52 1 27 6 1 11 18 1 31 40 -0.19 -108 0 0 0 58 52 0 20 16.5 63 132 11 0 53 15 1 4 29 0 48 42 1 9 2 -0.19 -107 0 0 0 36 29 0 20 25.6 64 133 10 0 30 53 0 42 6 0 26 20 0 46 39 -0.19 -106 0 0 0 14 21 0 20 34.7 65 133 9 0 8 45 0 19 57 0 4 13 0 24 30 -0.19 -105 0 0 - 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20 0 0 - 8 23 10 0 31 47.2 22 255 -77 - 8 28 31 - 8 17 49 - 8 32 52 - 8 13 29 -0.19 - 19 0 0 - 8 11 39 0 31 50.6 21 255 -78 - 8 17 0 - 8 6 18 - 8 21 21 - 8 1 57 -0.19 - 18 0 0 - 7 59 45 0 31 53.8 20 255 -79 - 8 5 7 - 7 54 24 - 8 9 28 - 7 50 2 -0.19 - 17 0 0 - 7 47 29 0 31 56.9 19 255 -80 - 7 52 51 - 7 42 7 - 7 57 12 - 7 37 45 -0.19 - 16 0 0 - 7 34 51 0 31 59.9 18 255 -80 - 7 40 13 - 7 29 29 - 7 44 35 - 7 25 7 -0.19 - 15 0 0 - 7 21 51 0 32 2.7 17 254 -81 - 7 27 14 - 7 16 28 - 7 31 36 - 7 12 6 -0.19 - 14 0 0 - 7 8 29 0 32 5.3 16 254 -82 - 7 13 52 - 7 3 6 - 7 18 15 - 6 58 43 -0.19 - 13 0 0 - 6 54 46 0 32 7.8 15 254 -83 - 7 0 9 - 6 49 22 - 7 4 32 - 6 44 59 -0.19 - 12 0 0 - 6 40 41 0 32 10.1 13 254 -83 - 6 46 5 - 6 35 17 - 6 50 28 - 6 30 54 -0.19 - 11 0 0 - 6 26 16 0 32 12.2 12 254 -84 - 6 31 40 - 6 20 51 - 6 36 3 - 6 16 28 -0.19 - 10 0 0 - 6 11 29 0 32 14.2 11 254 -84 - 6 16 54 - 6 6 4 - 6 21 18 - 6 1 41 -0.19 - 9 0 0 - 5 56 22 0 32 16.0 10 254 -84 - 6 1 47 - 5 50 57 - 6 6 11 - 5 46 33 -0.19 - 8 0 0 - 5 40 55 0 32 17.6 9 254 -84 - 5 46 21 - 5 35 29 - 5 50 45 - 5 31 5 -0.19 - 7 0 0 - 5 25 8 0 32 19.1 8 254 -84 - 5 30 34 - 5 19 41 - 5 34 58 - 5 15 17 -0.19 - 6 0 0 - 5 9 0 0 32 20.4 7 253 -84 - 5 14 27 - 5 3 34 - 5 18 52 - 4 59 9 -0.18 - 5 0 0 - 4 52 34 0 32 21.5 6 253 -83 - 4 58 0 - 4 47 7 - 5 2 26 - 4 42 41 -0.18 - 4 0 0 - 4 35 48 0 32 22.5 5 253 -83 - 4 41 15 - 4 30 20 - 4 45 41 - 4 25 54 -0.18 - 3 0 0 - 4 18 43 0 32 23.3 4 253 -82 - 4 24 10 - 4 13 15 - 4 28 37 - 4 8 49 -0.18 - 2 0 0 - 4 1 19 0 32 23.9 3 253 -81 - 4 6 47 - 3 55 51 - 4 11 14 - 3 51 24 -0.18 - 1 0 0 - 3 43 37 0 32 24.3 2 253 -80 - 3 49 6 - 3 38 9 - 3 53 33 - 3 33 42 -0.18 0 0 0 - 3 25 38 0 32 24.6 1 253 -80 - 3 31 7 - 3 20 8 - 3 35 34 - 3 15 41 -0.18 1 0 0 - 3 7 20 0 32 24.7 0 253 -79 - 3 12 50 .. .. .. - 3 17 17 .. .. .. 1.48 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 366-138855 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 36 41.7291 DE: -16 59 37.875 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 36 41.7290 DE: -16 59 37.875 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1178) Irmela asteroid class: approx. diameter [km]: 19 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.60490 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 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): 0.010", 0.004", 92.418° remarks: * orbital elements for (1178)Irmela : Mean anomaly = 113.2443886323 deg Arg. of pericenter = 357.5184243745 deg Long. of node = 169.9321843110 deg Inclination = 6.9664109157 deg Eccentricity = 0.1860328294 Semimajor axis = 2.6778665114 AU Perihelion dist = 2.1796954276 AU Mag: H = 12.02, G = 0.15 Epoch of elements : MJD 60575.01660583 TDT (2024 Sep 22.0166) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr24,1.55,2024,9,22,0.398539,0.047083,0.185149,6.715157,-1.706247,0.005630,0.000265,0.000000,0.000000 -87.8106,-16.9735,172.20,0.20,False UCAC4 366-138855,18.61159144,-16.9938541,11.81,11.56,11.43,0.0,0,,18.63549665,-16.9734933,5.88,5.56,0,0,0 1178,Irmela,17.43,19.043,2.6049,0,0,1.581,-5.76,,1.0,0 0,113.0157,2024,9,21,357.5184,169.9322,6.9664,0.18603,2.67787,2.17970,12.02,5.0,0.15 1.406,0.0097,0.0037,92,0.0041,Known errors,0.66,0,-1,-1 20240922_138855,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org