IOTA/IOTA-ES occultation update for (11309) Malus / UCAC4 458-002238 event on 2024 Oct 24, 19:07 UT Visible from Summary ------- On 2024 Oct 24 UT, the 14.427 km diameter asteroid (11309) Malus will occult a 11.8 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.98 mag to 16.78 mag (the magnitude of the asteroid) for at most 1.370 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: 92 * date and approx. time of event: 2024 Oct 24, 18:58 - 2024 Oct 24, 19:16 * geocentric midpoint of event [JD]: 2460608.29691883 * magnitude of target star: 11.81 * magnitude drop [mag]: 4.98 * estimated maximum duration [s]: 1.370 * Moon: 45 % sunlit, 103° distance * Sun: 169° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.030, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.031", 0.002", 73°) * approx speed of asteroid's shadow [km/s]: 10.5048 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 458-002238 by 11309 Malus on 2024 Oct 24 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 - 25 0 0 -51 37 36 19 16 44.9 0 87 11 -51 33 19 -51 41 54 -51 29 9 -51 46 3 .... - 24 0 0 -51 35 46 19 16 44.9 1 87 10 -51 31 29 -51 40 4 -51 27 19 -51 44 14 0.22 - 23 0 0 -51 33 37 19 16 44.8 1 86 9 -51 29 20 -51 37 55 -51 25 10 -51 42 5 0.33 - 22 0 0 -51 31 8 19 16 44.6 2 85 9 -51 26 51 -51 35 26 -51 22 41 -51 39 36 0.37 - 21 0 0 -51 28 20 19 16 44.3 3 84 8 -51 24 2 -51 32 38 -51 19 52 -51 36 48 0.39 - 20 0 0 -51 25 12 19 16 43.9 3 84 7 -51 20 54 -51 29 30 -51 16 44 -51 33 41 0.40 - 19 0 0 -51 21 44 19 16 43.5 4 83 7 -51 17 26 -51 26 3 -51 13 16 -51 30 14 0.41 - 18 0 0 -51 17 57 19 16 43.0 4 82 6 -51 13 38 -51 22 16 -51 9 28 -51 26 27 0.42 - 17 0 0 -51 13 50 19 16 42.3 5 81 6 -51 9 31 -51 18 9 -51 5 20 -51 22 21 0.42 - 16 0 0 -51 9 23 19 16 41.7 6 80 5 -51 5 4 -51 13 43 -51 0 53 -51 17 54 0.43 - 15 0 0 -51 4 37 19 16 40.9 6 80 4 -51 0 17 -51 8 56 -50 56 6 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34 0 21 24 0.46 134 0 0 0 40 36 18 59 16.5 23 271 -27 0 44 57 0 36 15 0 49 10 0 32 1 0.46 135 0 0 0 50 44 18 59 12.0 22 271 -26 0 55 4 0 46 23 0 59 17 0 42 10 0.46 136 0 0 1 0 22 18 59 7.7 21 271 -25 1 4 43 0 56 2 1 8 55 0 51 49 0.46 137 0 0 1 9 31 18 59 3.5 20 271 -24 1 13 51 1 5 11 1 18 3 1 0 58 0.46 138 0 0 1 18 10 18 58 59.6 19 271 -23 1 22 30 1 13 50 1 26 42 1 9 38 0.46 139 0 0 1 26 19 18 58 55.8 18 271 -22 1 30 39 1 22 0 1 34 51 1 17 48 0.46 140 0 0 1 33 59 18 58 52.3 17 271 -21 1 38 18 1 29 39 1 42 30 1 25 28 0.46 141 0 0 1 41 8 18 58 48.9 16 271 -20 1 45 27 1 36 49 1 49 39 1 32 37 0.47 142 0 0 1 47 48 18 58 45.7 16 271 -19 1 52 7 1 43 29 1 56 18 1 39 17 0.47 143 0 0 1 53 57 18 58 42.7 15 271 -18 1 58 16 1 49 38 2 2 26 1 45 27 0.47 144 0 0 1 59 36 18 58 39.9 14 271 -17 2 3 54 1 55 17 2 8 5 1 51 6 0.47 145 0 0 2 4 44 18 58 37.3 13 271 -16 2 9 3 2 0 26 2 13 13 1 56 15 0.47 146 0 0 2 9 22 18 58 34.9 12 271 -15 2 13 40 2 5 4 2 17 51 2 0 53 0.47 147 0 0 2 13 29 18 58 32.7 11 271 -15 2 17 48 2 9 11 2 21 58 2 5 0 0.48 148 0 0 2 17 6 18 58 30.7 10 271 -14 2 21 24 2 12 48 2 25 34 2 8 37 0.48 149 0 0 2 20 12 18 58 28.8 9 271 -13 2 24 30 2 15 54 2 28 40 2 11 43 0.48 150 0 0 2 22 47 18 58 27.2 8 271 -12 2 27 5 2 18 29 2 31 15 2 14 18 0.49 151 0 0 2 24 51 18 58 25.8 7 271 -11 2 29 9 2 20 33 2 33 19 2 16 23 0.49 152 0 0 2 26 24 18 58 24.5 6 271 -10 2 30 42 2 22 6 2 34 52 2 17 56 0.50 153 0 0 2 27 26 18 58 23.5 5 271 -9 2 31 44 2 23 8 2 35 54 2 18 58 0.51 154 0 0 2 27 57 18 58 22.7 4 271 -8 2 32 15 2 23 39 2 36 25 2 19 28 0.52 155 0 0 2 27 57 18 58 22.0 3 271 -7 2 32 15 2 23 38 2 36 25 2 19 28 0.54 156 0 0 2 27 25 18 58 21.6 2 271 -6 2 31 43 2 23 6 2 35 53 2 18 56 0.59 157 0 0 2 26 21 18 58 21.4 1 272 -5 2 30 40 2 22 3 2 34 50 2 17 53 0.80 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 458-002238 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 42 01.3839 DE: +01 26 22.891 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 42 01.3839 DE: +01 26 22.890 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.8 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (11309) Malus asteroid class: approx. diameter [km]: 14 approx. diameter ["]: 0.012 distance from Earth [AU]: 1.65570 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 date of fit: 2023 Feb 09 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): 0.031", 0.002", 73.379° remarks: * orbital elements for (11309)Malus : Mean anomaly = 348.1480758566 deg Arg. of pericenter = 244.8922975158 deg Long. of node = 157.1597026567 deg Inclination = 6.9743419201 deg Eccentricity = 0.1117124894 Semimajor axis = 2.9599277334 AU Perihelion dist = 2.6292668379 AU Mag: H = 13.20, G = 0.15 Epoch of elements : MJD 60607.79691734 TDT (2024 Oct 24.7969) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Feb09,1.37,2024,10,24,19.126052,0.187748,-0.369835,-5.287101,-2.683607,0.000352,0.001044,0.000001,0.000001 65.2644,1.5670,-110.87,-12.12,False UCAC4 458-002238,1.70038442,1.4396919,12.11,11.81,11.65,0.0,0,,1.72199276,1.5670140,4.98,4.70,0,0,0 11309,Malus,16.78,14.427,1.6557,0,0,-1.872,-14.25,,1.4,0 0,347.9938,2024,10,24,244.8923,157.1597,6.9743,0.11171,2.95993,2.62927,13.20,5.0,0.15 1.485,0.0310,0.0019,73,0.0058,Known errors,2.00,0,-1,-1 20241024_002238,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org