IOTA/IOTA-ES occultation update for (791) Ani / UCAC4 379-077627 event on 2024 Oct 15, 21:49 UT Visible from Summary ------- On 2024 Oct 15 UT, the 99.2770357201413 km diameter asteroid (791) Ani will occult a 10.7 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.14 mag to 14.85 mag (the magnitude of the asteroid) for at most 2.770 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 15, 21:46 - 2024 Oct 15, 21:52 * geocentric midpoint of event [JD]: 2460599.40911196 * magnitude of target star: 10.73 * magnitude drop [mag]: 4.14 * estimated maximum duration [s]: 2.770 * Moon: 96 % sunlit, 105° distance * Sun: 54° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 100 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.002", 106°) * approx speed of asteroid's shadow [km/s]: 35.8636 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 379-077627 by 791 Ani on 2024 Oct 15 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 -180 0 0 .. .. .... .. .. .. .. .. .. 20 12 48 .. .. .. 20 10 1 .. .. .. .... -179 0 0 20 25 14 21 46 10.1 1 106 49 19 57 10 20 53 18 19 54 23 20 56 5 .... -178 0 0 20 9 19 21 46 10.1 2 106 50 19 41 13 20 37 26 19 38 26 20 40 13 0.00 -177 0 0 19 53 5 21 46 10.3 3 106 51 19 24 57 20 21 14 19 22 9 20 24 2 -0.03 -176 0 0 19 36 32 21 46 10.4 4 107 52 19 8 21 20 4 44 19 5 34 20 7 31 -0.04 -175 0 0 19 19 40 21 46 10.7 5 107 53 18 51 27 19 47 54 18 48 40 19 50 42 -0.04 -174 0 0 19 2 30 21 46 11.0 6 107 53 18 34 15 19 30 46 18 31 27 19 33 35 -0.05 -173 0 0 18 45 2 21 46 11.3 7 108 54 18 16 44 19 13 20 18 13 56 19 16 9 -0.05 -172 0 0 18 27 15 21 46 11.7 8 108 55 17 58 55 18 55 36 17 56 7 18 58 24 -0.05 -171 0 0 18 9 10 21 46 12.1 9 108 56 17 40 48 18 37 34 17 38 0 18 40 22 -0.06 -170 0 0 17 50 48 21 46 12.6 10 109 57 17 22 23 18 19 14 17 19 35 18 22 2 -0.06 -169 0 0 17 32 8 21 46 13.2 11 109 58 17 3 41 18 0 36 17 0 52 18 3 25 -0.06 -168 0 0 17 13 11 21 46 13.8 12 109 59 16 44 42 17 41 41 16 41 53 17 44 31 -0.06 -167 0 0 16 53 57 21 46 14.5 13 109 59 16 25 26 17 22 30 16 22 37 17 25 19 -0.06 -166 0 0 16 34 27 21 46 15.2 14 110 60 16 5 53 17 3 1 16 3 4 17 5 51 -0.06 -165 0 0 16 14 40 21 46 16.0 15 110 61 15 46 4 16 43 17 15 43 15 16 46 7 -0.06 -164 0 0 15 54 37 21 46 16.8 16 110 62 15 25 59 16 23 16 15 23 9 16 26 6 -0.06 -163 0 0 15 34 19 21 46 17.7 17 111 62 15 5 39 16 3 0 15 2 48 16 5 50 -0.06 -162 0 0 15 13 45 21 46 18.7 18 111 63 14 45 3 15 42 28 14 42 12 15 45 18 -0.06 -161 0 0 14 52 56 21 46 19.7 19 111 64 14 24 12 15 21 41 14 21 21 15 24 32 -0.06 -160 0 0 14 31 52 21 46 20.8 20 111 65 14 3 6 15 0 39 14 0 15 15 3 30 -0.06 -159 0 0 14 10 34 21 46 21.9 21 112 65 13 41 46 14 39 23 13 38 55 14 42 14 -0.06 -158 0 0 13 49 2 21 46 23.1 22 112 66 13 20 12 14 17 53 13 17 21 14 20 45 -0.07 -157 0 0 13 27 17 21 46 24.3 23 112 67 12 58 25 13 56 10 12 55 34 13 59 1 -0.07 -156 0 0 13 5 18 21 46 25.6 24 112 67 12 36 25 13 34 13 12 33 33 13 37 5 -0.07 -155 0 0 12 43 7 21 46 27.0 25 113 68 12 14 12 13 12 4 12 11 20 13 14 56 -0.07 -154 0 0 12 20 44 21 46 28.4 26 113 68 11 51 47 12 49 42 11 48 55 12 52 34 -0.07 -153 0 0 11 58 9 21 46 29.9 27 113 69 11 29 10 12 27 8 11 26 18 12 30 1 -0.07 -152 0 0 11 35 22 21 46 31.4 28 113 69 11 6 22 12 4 24 11 3 30 12 7 16 -0.07 -151 0 0 11 12 25 21 46 33.0 29 114 70 10 43 23 11 41 28 10 40 31 11 44 20 -0.07 -150 0 0 10 49 17 21 46 34.7 30 114 70 10 20 14 11 18 21 10 17 22 11 21 14 -0.07 -149 0 0 10 26 0 21 46 36.4 32 114 71 9 56 55 10 55 5 9 54 3 10 57 58 -0.07 -148 0 0 10 2 33 21 46 38.1 33 114 71 9 33 27 10 31 40 9 30 35 10 34 33 -0.07 -147 0 0 9 38 57 21 46 39.9 34 114 71 9 9 51 10 8 5 9 6 58 10 10 58 -0.07 -146 0 0 9 15 13 21 46 41.8 35 115 71 8 46 5 9 44 22 8 43 12 9 47 16 -0.07 -145 0 0 8 51 22 21 46 43.7 36 115 71 8 22 13 9 20 32 8 19 20 9 23 25 -0.07 -144 0 0 8 27 23 21 46 45.7 37 115 72 7 58 13 8 56 34 7 55 20 8 59 27 -0.07 -143 0 0 8 3 17 21 46 47.7 38 115 72 7 34 6 8 32 29 7 31 13 8 35 23 -0.07 -142 0 0 7 39 6 21 46 49.8 39 115 71 7 9 54 8 8 18 7 7 1 8 11 12 -0.07 -141 0 0 7 14 49 21 46 52.0 40 116 71 6 45 36 7 44 2 6 42 43 7 46 56 -0.07 -140 0 0 6 50 27 21 46 54.1 41 116 71 6 21 14 7 19 40 6 18 20 7 22 34 -0.07 -139 0 0 6 26 0 21 46 56.4 42 116 71 5 56 47 6 55 15 5 53 53 6 58 8 -0.07 -138 0 0 6 1 30 21 46 58.7 43 116 71 5 32 17 6 30 45 5 29 23 6 33 39 -0.07 -137 0 0 5 36 57 21 47 1.0 44 116 70 5 7 43 6 6 12 5 4 49 6 9 6 -0.07 -136 0 0 5 12 22 21 47 3.4 46 116 70 4 43 7 5 41 37 4 40 14 5 44 31 -0.07 -135 0 0 4 47 44 21 47 5.8 47 117 69 4 18 30 5 17 0 4 15 36 5 19 53 -0.07 -134 0 0 4 23 5 21 47 8.3 48 117 69 3 53 51 4 52 21 3 50 57 4 55 15 -0.07 -133 0 0 3 58 26 21 47 10.8 49 117 68 3 29 12 4 27 41 3 26 18 4 30 35 -0.07 -132 0 0 3 33 46 21 47 13.4 50 117 68 3 4 32 4 3 2 3 1 39 4 5 56 -0.07 -131 0 0 3 9 8 21 47 16.0 51 117 67 2 39 54 3 38 23 2 37 0 3 41 17 -0.07 -130 0 0 2 44 30 21 47 18.7 52 118 67 2 15 16 3 13 45 2 12 23 3 16 39 -0.07 -129 0 0 2 19 54 21 47 21.4 53 118 66 1 50 41 2 49 8 1 47 47 2 52 2 -0.07 -128 0 0 1 55 21 21 47 24.1 54 118 65 1 26 8 2 24 35 1 23 15 2 27 28 -0.07 -127 0 0 1 30 50 21 47 26.9 55 118 64 1 1 38 2 0 4 0 58 45 2 2 57 -0.07 -126 0 0 1 6 24 21 47 29.7 56 118 64 0 37 13 1 35 36 0 34 19 1 38 30 -0.07 -125 0 0 0 42 2 21 47 32.5 57 119 63 0 12 51 1 11 13 0 9 58 1 14 7 -0.07 -124 0 0 0 17 44 21 47 35.4 58 119 62 - 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14 0 0 -14 32 47 21 52 1.8 10 258 -42 -15 0 23 -14 5 10 -15 3 7 -14 2 26 -0.07 - 13 0 0 -14 20 41 21 52 2.3 9 257 -43 -14 48 19 -13 53 3 -14 51 3 -13 50 18 -0.07 - 12 0 0 -14 8 15 21 52 2.8 8 257 -44 -14 35 55 -13 40 34 -14 38 39 -13 37 49 -0.07 - 11 0 0 -13 55 27 21 52 3.2 7 257 -45 -14 23 9 -13 27 44 -14 25 54 -13 25 0 -0.07 - 10 0 0 -13 42 19 21 52 3.5 6 257 -46 -14 10 3 -13 14 34 -14 12 48 -13 11 49 -0.07 - 9 0 0 -13 28 50 21 52 3.9 5 257 -47 -13 56 36 -13 1 3 -13 59 21 -12 58 18 -0.06 - 8 0 0 -13 15 0 21 52 4.1 4 256 -48 -13 42 48 -12 47 11 -13 45 33 -12 44 26 -0.06 - 7 0 0 -13 0 50 21 52 4.3 3 256 -49 -13 28 40 -12 32 59 -13 31 25 -12 30 13 -0.06 - 6 0 0 -12 46 19 21 52 4.5 2 256 -50 -13 14 12 -12 18 26 -13 16 57 -12 15 40 -0.05 - 5 0 0 -12 31 29 21 52 4.6 1 256 -51 -12 59 23 -12 3 33 -13 2 9 -12 0 47 -0.03 - 4 0 0 -12 16 18 21 52 4.6 0 255 -51 -12 44 15 -11 48 21 -12 47 1 -11 45 34 0.16 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 379-077627 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 02 41.3409 DE: -14 16 02.849 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 02 41.3408 DE: -14 16 02.849 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.7 * B mag [mag]: 11.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (791) Ani asteroid class: approx. diameter [km]: 99 approx. diameter ["]: 0.043 distance from Earth [AU]: 3.21210 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#72 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): 0.018", 0.002", 106.248° remarks: * orbital elements for (791)Ani : Mean anomaly = 318.0143728704 deg Arg. of pericenter = 201.8409713014 deg Long. of node = 129.7801974108 deg Inclination = 16.3747065336 deg Eccentricity = 0.1921073579 Semimajor axis = 3.1250166723 AU Perihelion dist = 2.5246779758 AU Mag: H = 9.22, G = 0.15 Epoch of elements : MJD 60598.90911192 TDT (2024 Oct 15.9091) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#722023Apr24,2.77,2024,10,15,21.818687,0.021815,0.072627,19.370424,-5.877343,0.004616,0.000059,-0.000001,0.000000 -96.1753,-14.3027,-150.88,-8.95,False UCAC4 379-077627,17.04481697,-14.2674581,11.57,10.73,10.28,0.1,0,,17.06796559,-14.3027076,4.14,4.15,0,0,0 791,Ani,14.85,99.510,3.2121,0,0,3.649,-16.09,,4.8,0 0,317.8522,2024,10,15,201.8410,129.7802,16.3747,0.19211,3.12502,2.52468,9.22,5.0,0.15 1.050,0.0180,0.0021,106,0.0021,Known errors,0.96,0,-1,-1 20241015_077627,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org