IOTA/IOTA-ES occultation update for (1924) Horus / HIP 110296 event on 2024 Dec 23, 12:08 UT Visible from Summary ------- On 2024 Dec 23 UT, the 12.5199231043129 km diameter asteroid (1924) Horus will occult a 8.9 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 10.06 mag to 18.92 mag (the magnitude of the asteroid) for at most 0.440 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: 98 * date and approx. time of event: 2024 Dec 23, 12:04 - 2024 Dec 23, 12:11 * geocentric midpoint of event [JD]: 2460668.00569062 * magnitude of target star: 8.86 * magnitude drop [mag]: 10.06 * estimated maximum duration [s]: 0.440 * Moon: 45 % sunlit, 146° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.002", 65°) * approx speed of asteroid's shadow [km/s]: 30.5263 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 110296 by 1924 Horus on 2024 Dec 23 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 - 35 0 0 -34 36 32 12 4 47.8 0 102 59 -34 40 23 -34 32 41 -34 43 5 -34 30 0 .... - 34 0 0 -34 47 3 12 4 47.9 1 102 59 -34 50 54 -34 43 12 -34 53 35 -34 40 31 0.20 - 33 0 0 -34 57 12 12 4 48.0 2 101 60 -35 1 2 -34 53 22 -35 3 43 -34 50 41 0.21 - 32 0 0 -35 6 59 12 4 48.1 3 100 61 -35 10 49 -35 3 9 -35 13 30 -35 0 28 0.21 - 31 0 0 -35 16 24 12 4 48.3 4 100 62 -35 20 14 -35 12 34 -35 22 54 -35 9 54 0.21 - 30 0 0 -35 25 27 12 4 48.5 4 99 62 -35 29 16 -35 21 37 -35 31 57 -35 18 57 0.21 - 29 0 0 -35 34 8 12 4 48.7 5 99 63 -35 37 57 -35 30 19 -35 40 37 -35 27 39 0.21 - 28 0 0 -35 42 27 12 4 49.1 6 98 64 -35 46 16 -35 38 38 -35 48 56 -35 35 58 0.21 - 27 0 0 -35 50 24 12 4 49.4 7 97 65 -35 54 13 -35 46 35 -35 56 52 -35 43 56 0.22 - 26 0 0 -35 57 59 12 4 49.8 8 97 65 -36 1 47 -35 54 11 -36 4 27 -35 51 31 0.22 - 25 0 0 -36 5 12 12 4 50.2 9 96 66 -36 9 0 -36 1 24 -36 11 40 -35 58 45 0.22 - 24 0 0 -36 12 4 12 4 50.7 9 96 67 -36 15 52 -36 8 16 -36 18 31 -36 5 37 0.22 - 23 0 0 -36 18 33 12 4 51.2 10 95 67 -36 22 21 -36 14 46 -36 25 0 -36 12 7 0.22 - 22 0 0 -36 24 41 12 4 51.8 11 95 68 -36 28 28 -36 20 54 -36 31 7 -36 18 15 0.22 - 21 0 0 -36 30 27 12 4 52.4 12 94 69 -36 34 14 -36 26 40 -36 36 53 -36 24 1 0.22 - 20 0 0 -36 35 51 12 4 53.0 13 93 69 -36 39 38 -36 32 4 -36 42 16 -36 29 25 0.22 - 19 0 0 -36 40 53 12 4 53.7 13 93 70 -36 44 40 -36 37 6 -36 47 18 -36 34 28 0.22 - 18 0 0 -36 45 33 12 4 54.4 14 92 70 -36 49 20 -36 41 47 -36 51 58 -36 39 8 0.22 - 17 0 0 -36 49 52 12 4 55.2 15 92 71 -36 53 38 -36 46 5 -36 56 17 -36 43 27 0.22 - 16 0 0 -36 53 49 12 4 56.0 16 91 72 -36 57 35 -36 50 2 -37 0 13 -36 47 24 0.22 - 15 0 0 -36 57 24 12 4 56.8 17 90 72 -37 1 10 -36 53 38 -37 3 48 -36 51 0 0.22 - 14 0 0 -37 0 37 12 4 57.7 17 90 73 -37 4 23 -36 56 51 -37 7 1 -36 54 13 0.22 - 13 0 0 -37 3 29 12 4 58.6 18 89 73 -37 7 15 -36 59 43 -37 9 53 -36 57 5 0.22 - 12 0 0 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258 -24 - 0 17 9 - 0 9 1 - 0 20 0 - 0 6 11 0.23 114 0 0 0 11 7 12 10 56.0 35 257 -25 0 7 3 0 15 10 0 4 12 0 18 0 0.23 115 0 0 0 35 0 12 10 58.3 34 257 -26 0 30 57 0 39 3 0 28 7 0 41 53 0.23 116 0 0 0 58 35 12 11 0.5 33 257 -27 0 54 32 1 2 38 0 51 42 1 5 28 0.23 117 0 0 1 21 51 12 11 2.7 32 257 -28 1 17 49 1 25 53 1 14 59 1 28 43 0.23 118 0 0 1 44 47 12 11 4.8 31 257 -29 1 40 45 1 48 49 1 37 56 1 51 38 0.23 119 0 0 2 7 24 12 11 6.9 30 257 -30 2 3 22 2 11 25 2 0 33 2 14 14 0.23 120 0 0 2 29 40 12 11 8.9 29 257 -31 2 25 39 2 33 41 2 22 50 2 36 29 0.23 121 0 0 2 51 35 12 11 10.8 28 257 -32 2 47 34 2 55 36 2 44 46 2 58 24 0.23 122 0 0 3 13 9 12 11 12.6 27 257 -33 3 9 9 3 17 10 3 6 21 3 19 57 0.23 123 0 0 3 34 22 12 11 14.4 26 257 -34 3 30 22 3 38 22 3 27 35 3 41 9 0.23 124 0 0 3 55 13 12 11 16.1 25 257 -35 3 51 14 3 59 12 3 48 26 4 2 0 0.23 125 0 0 4 15 42 12 11 17.7 24 257 -36 4 11 43 4 19 41 4 8 56 4 22 28 0.23 126 0 0 4 35 48 12 11 19.3 23 257 -37 4 31 50 4 39 46 4 29 3 4 42 33 0.23 127 0 0 4 55 31 12 11 20.7 22 257 -38 4 51 33 4 59 29 4 48 47 5 2 16 0.23 128 0 0 5 14 52 12 11 22.2 21 257 -39 5 10 54 5 18 50 5 8 8 5 21 36 0.23 129 0 0 5 33 49 12 11 23.5 20 257 -41 5 29 52 5 37 47 5 27 6 5 40 32 0.23 130 0 0 5 52 23 12 11 24.8 19 257 -42 5 48 26 5 56 20 5 45 41 5 59 5 0.23 131 0 0 6 10 33 12 11 26.0 18 257 -43 6 6 37 6 14 30 6 3 52 6 17 15 0.23 132 0 0 6 28 19 12 11 27.1 16 257 -44 6 24 23 6 32 15 6 21 39 6 35 0 0.23 133 0 0 6 45 41 12 11 28.2 15 258 -45 6 41 46 6 49 37 6 39 1 6 52 21 0.24 134 0 0 7 2 39 12 11 29.2 14 258 -46 6 58 44 7 6 34 6 56 0 7 9 18 0.24 135 0 0 7 19 12 12 11 30.1 13 258 -47 7 15 17 7 23 7 7 12 33 7 25 50 0.24 136 0 0 7 35 20 12 11 31.0 12 258 -48 7 31 26 7 39 14 7 28 42 7 41 58 0.24 137 0 0 7 51 4 12 11 31.7 11 258 -49 7 47 10 7 54 58 7 44 27 7 57 41 0.24 138 0 0 8 6 22 12 11 32.5 10 258 -50 8 2 29 8 10 16 7 59 46 8 12 59 0.24 139 0 0 8 21 16 12 11 33.1 9 258 -51 8 17 23 8 25 9 8 14 40 8 27 52 0.24 140 0 0 8 35 44 12 11 33.7 8 258 -52 8 31 51 8 39 37 8 29 9 8 42 19 0.25 141 0 0 8 49 47 12 11 34.2 7 259 -53 8 45 54 8 53 39 8 43 12 8 56 21 0.25 142 0 0 9 3 24 12 11 34.6 6 259 -54 8 59 32 9 7 16 8 56 50 9 9 58 0.25 143 0 0 9 16 36 12 11 35.0 5 259 -55 9 12 44 9 20 28 9 10 3 9 23 9 0.26 144 0 0 9 29 22 12 11 35.3 4 259 -56 9 25 31 9 33 13 9 22 49 9 35 55 0.27 145 0 0 9 41 43 12 11 35.6 3 259 -57 9 37 52 9 45 34 9 35 10 9 48 15 0.28 146 0 0 9 53 37 12 11 35.7 2 259 -57 9 49 47 9 57 28 9 47 6 10 0 9 0.30 147 0 0 10 5 6 12 11 35.8 1 260 -58 10 1 16 10 8 56 9 58 35 10 11 37 0.37 148 0 0 10 16 9 12 11 35.9 0 260 -59 10 12 19 10 19 59 10 9 38 10 22 40 1.28 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: HIP 110296 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 20 26.2601 DE: -10 13 39.096 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 20 26.2600 DE: -10 13 39.097 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 8.9 * B mag [mag]: 10.2 * Diameter [mas]: 0.50 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1924) Horus asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.92050 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#46 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", 0.002", 64.514° remarks: * orbital elements for (1924)Horus : Mean anomaly = 217.5276640964 deg Arg. of pericenter = 153.0926737180 deg Long. of node = 350.1609262325 deg Inclination = 2.7312312379 deg Eccentricity = 0.1324335898 Semimajor axis = 2.3387315478 AU Perihelion dist = 2.0290049333 AU Mag: H = 13.54, G = 0.15 Epoch of elements : MJD 60667.50569046 TDT (2024 Dec 23.5057) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr24,0.44,2024,12,23,12.136575,0.081735,-0.196618,15.896390,6.646285,0.004835,0.001882,-0.000001,0.000000 60.8618,-10.1033,-2.22,-23.42,False HIP 110296,22.34062783,-10.2275265,10.16,8.86,8.16,0.5,0,,22.36249845,-10.1032762,10.06,10.31,0,0,0 1924,Horus,18.92,13.579,2.9205,0,0,3.241,20.02,,0.8,0 0,217.3883,2024,12,23,153.0927,350.1609,2.7312,0.13243,2.33873,2.02900,13.54,5.0,0.15 1.349,0.0103,0.0022,65,0.0022,Known errors,1.18,0,-1,-1 20241223_110296,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org