IOTA/IOTA-ES occultation update for (14612) Irtish / UCAC4 383-072734 event on 2024 Feb 02, 14:48 UT Visible from Summary ------- On 2024 Feb 02 UT, the 18.185 km diameter asteroid (14612) Irtish will occult a 11.8 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.74 mag to 18.53 mag (the magnitude of the asteroid) for at most 0.680 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: 94 * date and approx. time of event: 2024 Feb 02, 14:45 - 2024 Feb 02, 14:51 * geocentric midpoint of event [JD]: 2460343.11707796 * magnitude of target star: 11.79 * magnitude drop [mag]: 6.74 * estimated maximum duration [s]: 0.680 * Moon: 54 % sunlit, 24° distance * Sun: 73° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 103°) * approx speed of asteroid's shadow [km/s]: 26.8509 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 383-072734 by 14612 Irtish on 2024 Feb 2 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 149 0 0 -28 15 12 14 45 18.4 0 105 -45 -28 21 23 -28 9 2 -28 26 56 -28 3 31 .... 150 0 0 -28 29 55 14 45 18.4 1 105 -44 -28 36 6 -28 23 45 -28 41 39 -28 18 13 0.48 151 0 0 -28 44 45 14 45 18.5 2 104 -44 -28 50 56 -28 38 34 -28 56 29 -28 33 2 0.58 152 0 0 -28 59 40 14 45 18.7 3 104 -43 -29 5 52 -28 53 29 -29 11 25 -28 47 57 0.61 153 0 0 -29 14 42 14 45 19.0 4 103 -43 -29 20 54 -29 8 31 -29 26 27 -29 2 58 0.63 154 0 0 -29 29 49 14 45 19.3 5 103 -42 -29 36 1 -29 23 37 -29 41 35 -29 18 5 0.64 155 0 0 -29 45 1 14 45 19.7 6 102 -42 -29 51 13 -29 38 49 -29 56 47 -29 33 17 0.64 156 0 0 -30 0 18 14 45 20.2 6 102 -41 -30 6 30 -29 54 6 -30 12 4 -29 48 33 0.65 157 0 0 -30 15 39 14 45 20.8 7 101 -41 -30 21 52 -30 9 27 -30 27 26 -30 3 54 0.65 158 0 0 -30 31 4 14 45 21.4 8 101 -40 -30 37 17 -30 24 52 -30 42 51 -30 19 19 0.65 159 0 0 -30 46 33 14 45 22.1 9 100 -40 -30 52 46 -30 40 20 -30 58 20 -30 34 47 0.66 160 0 0 -31 2 5 14 45 22.8 10 100 -39 -31 8 18 -30 55 52 -31 13 53 -30 50 19 0.66 161 0 0 -31 17 40 14 45 23.6 11 99 -39 -31 23 54 -31 11 27 -31 29 28 -31 5 54 0.66 162 0 0 -31 33 18 14 45 24.5 12 99 -38 -31 39 32 -31 27 5 -31 45 7 -31 21 31 0.66 163 0 0 -31 48 58 14 45 25.5 13 98 -37 -31 55 12 -31 42 45 -32 0 47 -31 37 11 0.66 164 0 0 -32 4 40 14 45 26.5 14 98 -37 -32 10 54 -31 58 27 -32 16 29 -31 52 53 0.66 165 0 0 -32 20 23 14 45 27.6 14 97 -36 -32 26 37 -32 14 10 -32 32 13 -32 8 36 0.66 166 0 0 -32 36 8 14 45 28.7 15 96 -36 -32 42 22 -32 29 54 -32 47 57 -32 24 20 0.67 167 0 0 -32 51 53 14 45 29.9 16 96 -35 -32 58 7 -32 45 39 -33 3 43 -32 40 5 0.67 168 0 0 -33 7 39 14 45 31.2 17 95 -34 -33 13 53 -33 1 25 -33 19 29 -32 55 51 0.67 169 0 0 -33 23 25 14 45 32.5 18 95 -34 -33 29 39 -33 17 11 -33 35 15 -33 11 36 0.67 170 0 0 -33 39 10 14 45 33.9 19 94 -33 -33 45 25 -33 32 56 -33 51 0 -33 27 22 0.67 171 0 0 -33 54 55 14 45 35.3 20 93 -32 -34 1 10 -33 48 41 -34 6 45 -33 43 7 0.67 172 0 0 -34 10 39 14 45 36.9 20 93 -32 -34 16 53 -34 4 25 -34 22 29 -33 58 50 0.67 173 0 0 -34 26 22 14 45 38.4 21 92 -31 -34 32 36 -34 20 8 -34 38 12 -34 14 33 0.67 174 0 0 -34 42 3 14 45 40.0 22 92 -30 -34 48 17 -34 35 48 -34 53 53 -34 30 14 0.67 175 0 0 -34 57 41 14 45 41.7 23 91 -30 -35 3 56 -34 51 27 -35 9 32 -34 45 53 0.67 176 0 0 -35 13 18 14 45 43.4 24 90 -29 -35 19 33 -35 7 4 -35 25 8 -35 1 29 0.67 177 0 0 -35 28 52 14 45 45.2 25 89 -28 -35 35 6 -35 22 38 -35 40 42 -35 17 3 0.67 178 0 0 -35 44 23 14 45 47.0 25 89 -27 -35 50 37 -35 38 9 -35 56 13 -35 32 34 0.67 179 0 0 -35 59 50 14 45 48.9 26 88 -27 -36 6 5 -35 53 36 -36 11 41 -35 48 2 0.67 -180 0 0 -36 15 14 14 45 50.8 27 87 -26 -36 21 29 -36 9 0 -36 27 4 -36 3 26 0.67 -179 0 0 -36 30 34 14 45 52.8 28 87 -25 -36 36 48 -36 24 20 -36 42 24 -36 18 46 0.67 -178 0 0 -36 45 49 14 45 54.8 29 86 -25 -36 52 4 -36 39 36 -36 57 39 -36 34 1 0.67 -177 0 0 -37 1 0 14 45 56.8 29 85 -24 -37 7 14 -36 54 46 -37 12 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42 -41 28 19 0.70 - 31 0 0 -41 27 22 14 51 44.9 13 263 64 -41 33 33 -41 21 12 -41 39 5 -41 15 41 0.70 - 30 0 0 -41 14 36 14 51 45.8 12 263 64 -41 20 46 -41 8 25 -41 26 19 -41 2 54 0.71 - 29 0 0 -41 1 40 14 51 46.6 12 262 64 -41 7 51 -40 55 29 -41 13 23 -40 49 57 0.71 - 28 0 0 -40 48 35 14 51 47.4 11 261 64 -40 54 46 -40 42 24 -41 0 19 -40 36 52 0.71 - 27 0 0 -40 35 21 14 51 48.1 10 261 64 -40 41 33 -40 29 10 -40 47 6 -40 23 38 0.71 - 26 0 0 -40 21 59 14 51 48.7 9 260 64 -40 28 11 -40 15 47 -40 33 44 -40 10 15 0.72 - 25 0 0 -40 8 28 14 51 49.4 8 259 64 -40 14 40 -40 2 17 -40 20 14 -39 56 44 0.72 - 24 0 0 -39 54 50 14 51 49.9 8 259 63 -40 1 2 -39 48 38 -40 6 36 -39 43 5 0.73 - 23 0 0 -39 41 3 14 51 50.4 7 258 63 -39 47 15 -39 34 51 -39 52 49 -39 29 18 0.73 - 22 0 0 -39 27 9 14 51 50.9 6 257 63 -39 33 21 -39 20 57 -39 38 56 -39 15 24 0.74 - 21 0 0 -39 13 7 14 51 51.3 5 257 62 -39 19 20 -39 6 55 -39 24 54 -39 1 22 0.75 - 20 0 0 -38 58 58 14 51 51.6 4 256 62 -39 5 11 -38 52 46 -39 10 46 -38 47 12 0.77 - 19 0 0 -38 44 42 14 51 51.9 4 255 62 -38 50 56 -38 38 30 -38 56 30 -38 32 56 0.79 - 18 0 0 -38 30 20 14 51 52.1 3 255 61 -38 36 33 -38 24 7 -38 42 8 -38 18 33 0.82 - 17 0 0 -38 15 51 14 51 52.3 2 254 61 -38 22 4 -38 9 38 -38 27 39 -38 4 4 0.89 - 16 0 0 -38 1 16 14 51 52.4 1 254 60 -38 7 29 -37 55 3 -38 13 4 -37 49 29 1.06 - 15 0 0 -37 46 35 14 51 52.4 0 253 60 -37 52 48 -37 40 21 -37 58 24 -37 34 48 2.41 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: UCAC4 383-072734 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 58 15.9989 DE: -13 28 03.581 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 58 15.9990 DE: -13 28 03.582 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (14612) Irtish asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.97980 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Apr 25 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", 0.003", 102.709° remarks: * orbital elements for (14612)Irtish : Mean anomaly = 2.7707251841 deg Arg. of pericenter = 76.5660127141 deg Long. of node = 140.9422147931 deg Inclination = 7.3155366540 deg Eccentricity = 0.0973184224 Semimajor axis = 3.1547854335 AU Perihelion dist = 2.8477666920 AU Mag: H = 12.91, G = 0.15 Epoch of elements : MJD 60342.61707800 TDT (2024 Feb 02.6171) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr25,0.68,2024,2,2,14.809871,-0.047404,-0.554696,15.099715,-1.297728,-0.005506,0.001351,-0.000001,0.000000 -114.5489,-13.5374,-38.74,-16.84,False UCAC4 383-072734,15.97111079,-13.4676614,12.43,11.79,11.44,0.0,0,,15.99331037,-13.5373580,6.74,6.64,0,0,0 14612,Irtish,18.53,18.185,2.9798,0,0,3.056,-3.83,,1.4,0 0,2.6622,2024,2,2,76.5660,140.9422,7.3155,0.09732,3.15479,2.84777,12.91,5.0,0.15 1.448,0.0207,0.0026,103,0.0038,Known errors,1.12,0,-1,-1 20240202_072734,60138.15 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org