IOTA/IOTA-ES occultation update for (584) Semiramis / UCAC4 340-067680 event on 2024 Jan 25, 06:07 UT Visible from Summary ------- On 2024 Jan 25 UT, the 53.852 km diameter asteroid (584) Semiramis will occult a 11.9 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.21 mag to 13.97 mag (the magnitude of the asteroid) for at most 4.160 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: 99 * date and approx. time of event: 2024 Jan 25, 05:59 - 2024 Jan 25, 06:15 * geocentric midpoint of event [JD]: 2460334.75515958 * magnitude of target star: 11.91 * magnitude drop [mag]: 2.21 * estimated maximum duration [s]: 4.160 * Moon: 100 % sunlit, 92° distance * Sun: 95° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 107°) * approx speed of asteroid's shadow [km/s]: 12.9374 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 340-067680 by 584 Semiramis on 2024 Jan 25 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 - 70 0 0 51 1 23 5 59 23.6 0 127 -55 50 42 47 51 19 59 50 33 30 51 29 19 .... - 69 0 0 50 32 1 5 59 23.7 1 128 -56 50 13 16 50 50 47 50 3 54 51 0 11 0.01 - 68 0 0 50 1 40 5 59 23.9 2 129 -56 49 42 46 50 20 36 49 33 19 50 30 5 -0.07 - 67 0 0 49 30 19 5 59 24.1 3 130 -56 49 11 15 49 49 24 49 1 43 49 58 58 -0.10 - 66 0 0 48 57 56 5 59 24.5 4 130 -56 48 38 42 49 17 11 48 29 5 49 26 50 -0.12 - 65 0 0 48 24 29 5 59 25.1 5 131 -56 48 5 5 48 43 55 47 55 23 48 53 38 -0.13 - 64 0 0 47 49 57 5 59 25.7 5 132 -56 47 30 23 48 9 33 47 20 36 48 19 22 -0.14 - 63 0 0 47 14 19 5 59 26.5 6 133 -56 46 54 35 47 34 5 46 44 43 47 43 59 -0.15 - 62 0 0 46 37 33 5 59 27.4 7 133 -56 46 17 37 46 57 29 46 7 40 47 7 29 -0.15 - 61 0 0 45 59 36 5 59 28.5 8 134 -56 45 39 31 46 19 44 45 29 28 46 29 48 -0.16 - 60 0 0 45 20 29 5 59 29.8 9 135 -56 45 0 12 45 40 47 44 50 4 45 50 57 -0.16 - 59 0 0 44 40 8 5 59 31.2 10 136 -55 44 19 41 45 0 37 44 9 28 45 10 53 -0.16 - 58 0 0 43 58 33 5 59 32.8 11 136 -55 43 37 55 44 19 13 43 27 37 44 29 34 -0.16 - 57 0 0 43 15 43 5 59 34.6 12 137 -55 42 54 54 43 36 34 42 44 30 43 47 0 -0.16 - 56 0 0 42 31 36 5 59 36.5 13 138 -55 42 10 36 42 52 37 42 0 6 43 3 9 -0.16 - 55 0 0 41 46 10 5 59 38.7 14 138 -55 41 24 59 42 7 23 41 14 24 42 18 0 -0.17 - 54 0 0 40 59 24 5 59 41.1 15 139 -54 40 38 3 41 20 48 40 27 22 41 31 31 -0.17 - 53 0 0 40 11 19 5 59 43.8 16 140 -54 39 49 46 40 32 53 39 39 0 40 43 42 -0.17 - 52 0 0 39 21 51 5 59 46.7 18 140 -54 39 0 8 39 43 37 38 49 16 39 54 31 -0.17 - 51 0 0 38 31 1 5 59 49.8 19 141 -53 38 9 7 38 52 58 37 58 10 39 3 57 -0.17 - 50 0 0 37 38 49 5 59 53.2 20 142 -53 37 16 44 38 0 56 37 5 42 38 12 1 -0.17 - 49 0 0 36 45 13 5 59 56.9 21 142 -52 36 22 57 37 7 31 36 11 50 37 18 41 -0.17 - 48 0 0 35 50 13 6 0 0.8 22 143 -52 35 27 48 36 12 41 35 16 35 36 23 57 -0.17 - 47 0 0 34 53 50 6 0 5.1 24 144 -51 34 31 14 35 16 28 34 19 57 35 27 49 -0.17 - 46 0 0 33 56 4 6 0 9.7 25 144 -51 33 33 18 34 18 52 33 21 56 34 30 17 -0.17 - 45 0 0 32 56 54 6 0 14.5 26 145 -50 32 33 59 33 19 52 32 22 32 33 31 22 -0.17 - 44 0 0 31 56 23 6 0 19.8 27 145 -49 31 33 19 32 19 30 31 21 47 32 31 5 -0.17 - 43 0 0 30 54 31 6 0 25.3 29 146 -49 30 31 18 31 17 47 30 19 42 31 29 26 -0.17 - 42 0 0 29 51 20 6 0 31.2 30 147 -48 29 27 58 30 14 44 29 16 18 30 26 27 -0.17 - 41 0 0 28 46 51 6 0 37.5 32 147 -47 28 23 21 29 10 23 28 11 37 29 22 10 -0.17 - 40 0 0 27 41 6 6 0 44.1 33 148 -46 27 17 29 28 4 46 27 5 42 28 16 37 -0.17 - 39 0 0 26 34 9 6 0 51.1 34 148 -45 26 10 25 26 57 55 25 58 34 27 9 50 -0.17 - 38 0 0 25 26 2 6 0 58.4 36 149 -44 25 2 12 25 49 55 24 50 17 26 1 52 -0.17 - 37 0 0 24 16 48 6 1 6.2 37 150 -43 23 52 52 24 40 46 23 40 55 24 52 47 -0.17 - 36 0 0 23 6 31 6 1 14.3 39 150 -42 22 42 31 23 30 35 22 30 31 23 42 38 -0.18 - 35 0 0 21 55 16 6 1 22.7 40 151 -41 21 31 11 22 19 24 21 19 9 22 31 29 -0.18 - 34 0 0 20 43 6 6 1 31.6 42 151 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48 -37 7 30 -37 45 22 -36 59 55 -0.21 42 0 0 -37 31 53 6 13 32.5 40 271 45 -37 46 59 -37 16 46 -37 54 32 -37 9 12 -0.21 43 0 0 -37 40 24 6 13 37.1 39 270 45 -37 55 28 -37 25 20 -38 3 0 -37 17 47 -0.21 44 0 0 -37 48 13 6 13 41.5 38 270 46 -38 3 15 -37 33 11 -38 10 45 -37 25 39 -0.21 45 0 0 -37 55 20 6 13 45.9 37 269 47 -38 10 20 -37 40 20 -38 17 50 -37 32 49 -0.21 46 0 0 -38 1 46 6 13 50.1 36 269 48 -38 16 44 -37 46 47 -38 24 13 -37 39 17 -0.21 47 0 0 -38 7 30 6 13 54.3 35 268 49 -38 22 27 -37 52 33 -38 29 55 -37 45 4 -0.21 48 0 0 -38 12 34 6 13 58.4 35 268 49 -38 27 29 -37 57 38 -38 34 56 -37 50 10 -0.21 49 0 0 -38 16 57 6 14 2.3 34 267 50 -38 31 51 -38 2 3 -38 39 17 -37 54 35 -0.21 50 0 0 -38 20 40 6 14 6.2 33 266 51 -38 35 32 -38 5 47 -38 42 59 -37 58 19 -0.21 51 0 0 -38 23 43 6 14 10.0 32 266 51 -38 38 34 -38 8 50 -38 46 0 -38 1 23 -0.21 52 0 0 -38 26 5 6 14 13.7 32 265 52 -38 40 56 -38 11 13 -38 48 22 -38 3 47 -0.21 53 0 0 -38 27 48 6 14 17.4 31 265 53 -38 42 39 -38 12 57 -38 50 4 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49 58 6 14 56.7 20 257 62 -38 4 58 -37 34 57 -38 12 27 -37 27 27 -0.20 67 0 0 -37 42 23 6 14 59.1 20 257 63 -37 57 24 -37 27 20 -38 4 55 -37 19 49 -0.20 68 0 0 -37 34 7 6 15 1.5 19 256 64 -37 49 10 -37 19 2 -37 56 42 -37 11 30 -0.20 69 0 0 -37 25 9 6 15 3.8 18 255 64 -37 40 15 -37 10 3 -37 47 48 -37 2 29 -0.20 70 0 0 -37 15 30 6 15 5.9 17 255 65 -37 30 39 -37 0 21 -37 38 13 -36 52 46 -0.20 71 0 0 -37 5 9 6 15 8.0 16 254 66 -37 20 20 -36 49 57 -37 27 55 -36 42 21 -0.20 72 0 0 -36 54 6 6 15 10.0 16 254 67 -37 9 19 -36 38 51 -37 16 56 -36 31 13 -0.20 73 0 0 -36 42 19 6 15 11.9 15 253 67 -36 57 36 -36 27 2 -37 5 14 -36 19 22 -0.20 74 0 0 -36 29 50 6 15 13.8 14 252 68 -36 45 9 -36 14 29 -36 52 49 -36 6 48 -0.20 75 0 0 -36 16 36 6 15 15.5 13 252 69 -36 31 59 -36 1 12 -36 39 41 -35 53 30 -0.20 76 0 0 -36 2 39 6 15 17.1 12 251 69 -36 18 5 -35 47 11 -36 25 48 -35 39 27 -0.20 77 0 0 -35 47 56 6 15 18.6 11 251 70 -36 3 27 -35 32 25 -36 11 12 -35 24 39 -0.19 78 0 0 -35 32 29 6 15 20.1 10 250 71 -35 48 3 -35 16 54 -35 55 50 -35 9 6 -0.19 79 0 0 -35 16 15 6 15 21.4 10 249 71 -35 31 54 -35 0 36 -35 39 42 -34 52 46 -0.19 80 0 0 -34 59 16 6 15 22.6 9 249 72 -35 14 58 -34 43 32 -35 22 49 -34 35 40 -0.19 81 0 0 -34 41 29 6 15 23.7 8 248 73 -34 57 15 -34 25 41 -35 5 9 -34 17 47 -0.19 82 0 0 -34 22 54 6 15 24.8 7 248 73 -34 38 45 -34 7 2 -34 46 41 -33 59 5 -0.19 83 0 0 -34 3 31 6 15 25.7 6 247 74 -34 19 27 -33 47 34 -34 27 25 -33 39 35 -0.19 84 0 0 -33 43 19 6 15 26.4 5 247 75 -33 59 20 -33 27 17 -34 7 21 -33 19 16 -0.19 85 0 0 -33 22 18 6 15 27.1 4 246 75 -33 38 24 -33 6 11 -33 46 27 -32 58 7 -0.19 86 0 0 -33 0 26 6 15 27.7 3 246 76 -33 16 37 -32 44 13 -33 24 43 -32 36 7 -0.18 87 0 0 -32 37 42 6 15 28.1 2 245 76 -32 53 59 -32 21 25 -33 2 7 -32 13 15 -0.18 88 0 0 -32 14 7 6 15 28.4 2 244 77 -32 30 30 -31 57 44 -32 38 41 -31 49 32 -0.17 89 0 0 -31 49 40 6 15 28.5 1 244 77 -32 6 8 -31 33 10 -32 14 22 -31 24 55 -0.14 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 340-067680 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 30 52.7868 DE: -22 08 51.224 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 30 52.7868 DE: -22 08 51.225 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (584) Semiramis asteroid class: approx. diameter [km]: 54 approx. diameter ["]: 0.028 distance from Earth [AU]: 2.67150 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#108 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): 0.014", 0.002", 107.336° remarks: * orbital elements for (584)Semiramis : Mean anomaly = 183.1278109046 deg Arg. of pericenter = 85.3594711573 deg Long. of node = 282.0004959079 deg Inclination = 10.7186577302 deg Eccentricity = 0.2334217076 Semimajor axis = 2.3740542617 AU Perihelion dist = 1.8198984621 AU Mag: H = 8.53, G = 0.24 Epoch of elements : MJD 60334.25515984 TDT (2024 Jan 25.2552) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1082023Apr24,4.16,2024,1,25,6.123830,0.141953,0.138353,5.098866,-5.227268,-0.005456,0.002315,0.000000,0.000000 -12.8675,-22.2706,91.18,-19.08,False UCAC4 340-067680,13.51466298,-22.1475622,12.35,11.91,11.67,0.0,0,,13.53656837,-22.2705714,2.21,2.03,0,0,0 584,Semiramis,13.97,53.852,2.6715,0,0,1.210,-17.21,,2.8,0 0,183.0591,2024,1,25,85.3595,282.0005,10.7187,0.23342,2.37405,1.81990,8.52,5.0,0.15 1.250,0.0140,0.0023,107,0.0070,Known errors,1.69,0,-1,-1 20240125_067680,60137.03 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org