IOTA/IOTA-ES occultation update for (754) Malabar / UCAC4 507-087295 event on 2024 Jul 12, 23:03 UT Visible from Summary ------- On 2024 Jul 12 UT, the 89.4585743841125 km diameter asteroid (754) Malabar will occult a 10.0 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.17 mag to 14.14 mag (the magnitude of the asteroid) for at most 6.970 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 Jul 12, 22:56 - 2024 Jul 12, 23:11 * geocentric midpoint of event [JD]: 2460504.46083071 * magnitude of target star: 9.99 * magnitude drop [mag]: 4.17 * estimated maximum duration [s]: 6.970 * Moon: 40 % sunlit, 94° distance * Sun: 145° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.006", 85°) * approx speed of asteroid's shadow [km/s]: 13.2469 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 507-087295 by 754 Malabar on 2024 Jul 12 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 - 75 0 0 -44 43 45 23 10 53.0 0 74 -16 -44 15 9 -45 12 29 -44 8 6 -45 19 35 .... - 74 0 0 -44 31 15 23 10 52.9 1 73 -17 -44 2 35 -45 0 1 -43 55 31 -45 7 9 0.22 - 73 0 0 -44 18 24 23 10 52.7 2 72 -17 -43 49 41 -44 47 14 -43 42 36 -44 54 22 0.31 - 72 0 0 -44 5 13 23 10 52.4 3 72 -18 -43 36 27 -44 34 6 -43 29 21 -44 41 16 0.36 - 71 0 0 -43 51 42 23 10 52.1 3 71 -19 -43 22 53 -44 20 39 -43 15 46 -44 27 49 0.38 - 70 0 0 -43 37 52 23 10 51.6 4 70 -19 -43 8 59 -44 6 52 -43 1 51 -44 14 3 0.40 - 69 0 0 -43 23 41 23 10 51.1 5 70 -20 -42 54 45 -43 52 45 -42 47 37 -43 59 57 0.41 - 68 0 0 -43 9 11 23 10 50.4 6 69 -20 -42 40 11 -43 38 18 -42 33 2 -43 45 30 0.41 - 67 0 0 -42 54 20 23 10 49.7 6 68 -21 -42 25 17 -43 23 30 -42 18 7 -43 30 44 0.42 - 66 0 0 -42 39 9 23 10 48.9 7 68 -22 -42 10 3 -43 8 23 -42 2 52 -43 15 38 0.42 - 65 0 0 -42 23 39 23 10 47.9 8 67 -23 -41 54 29 -42 52 57 -41 47 18 -43 0 12 0.43 - 64 0 0 -42 7 49 23 10 46.9 9 66 -23 -41 38 35 -42 37 10 -41 31 23 -42 44 26 0.43 - 63 0 0 -41 51 39 23 10 45.7 10 66 -24 -41 22 22 -42 21 3 -41 15 9 -42 28 20 0.43 - 62 0 0 -41 35 9 23 10 44.5 10 65 -25 -41 5 49 -42 4 37 -40 58 35 -42 11 55 0.44 - 61 0 0 -41 18 20 23 10 43.1 11 64 -25 -40 48 56 -41 47 51 -40 41 42 -41 55 10 0.44 - 60 0 0 -41 1 11 23 10 41.6 12 64 -26 -40 31 44 -41 30 46 -40 24 29 -41 38 6 0.44 - 59 0 0 -40 43 43 23 10 40.0 13 63 -27 -40 14 13 -41 13 21 -40 6 56 -41 20 42 0.44 - 58 0 0 -40 25 56 23 10 38.3 14 62 -27 -39 56 22 -40 55 37 -39 49 5 -41 2 59 0.44 - 57 0 0 -40 7 49 23 10 36.5 14 62 -28 -39 38 12 -40 37 34 -39 30 54 -40 44 56 0.44 - 56 0 0 -39 49 24 23 10 34.6 15 61 -29 -39 19 43 -40 19 12 -39 12 25 -40 26 35 0.45 - 55 0 0 -39 30 39 23 10 32.6 16 60 -30 -39 0 56 -40 0 30 -38 53 36 -40 7 54 0.45 - 54 0 0 -39 11 36 23 10 30.4 17 60 -30 -38 41 49 -39 41 30 -38 34 29 -39 48 55 0.45 - 53 0 0 -38 52 14 23 10 28.1 18 59 -31 -38 22 25 -39 22 12 -38 15 4 -39 29 37 0.45 - 52 0 0 -38 32 34 23 10 25.7 18 58 -32 -38 2 42 -39 2 35 -37 55 20 -39 10 1 0.45 - 51 0 0 -38 12 36 23 10 23.2 19 58 -33 -37 42 40 -38 42 40 -37 35 18 -38 50 7 0.45 - 50 0 0 -37 52 20 23 10 20.6 20 57 -33 -37 22 22 -38 22 27 -37 14 58 -38 29 54 0.45 - 49 0 0 -37 31 46 23 10 17.8 21 56 -34 -37 1 45 -38 1 56 -36 54 21 -38 9 24 0.45 - 48 0 0 -37 10 55 23 10 14.9 22 56 -35 -36 40 51 -37 41 7 -36 33 27 -37 48 36 0.45 - 47 0 0 -36 49 47 23 10 11.9 23 55 -36 -36 19 40 -37 20 2 -36 12 15 -37 27 31 0.45 - 46 0 0 -36 28 22 23 10 8.8 24 54 -36 -35 58 13 -36 58 39 -35 50 47 -37 6 10 0.45 - 45 0 0 -36 6 40 23 10 5.5 24 54 -37 -35 36 29 -36 37 0 -35 29 2 -36 44 31 0.45 - 44 0 0 -35 44 42 23 10 2.1 25 53 -38 -35 14 28 -36 15 5 -35 7 1 -36 22 36 0.46 - 43 0 0 -35 22 29 23 9 58.6 26 52 -39 -34 52 12 -35 52 53 -34 44 45 -36 0 26 0.46 - 42 0 0 -35 0 0 23 9 54.9 27 52 -40 -34 29 41 -35 30 26 -34 22 13 -35 37 59 0.46 - 41 0 0 -34 37 15 23 9 51.1 28 51 -40 -34 6 54 -35 7 44 -33 59 26 -35 15 17 0.46 - 40 0 0 -34 14 16 23 9 47.2 29 50 -41 -33 43 53 -34 44 47 -33 36 24 -34 52 21 0.46 - 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1 45 21 - 2 55 6 0.49 92 0 0 - 2 30 0 22 56 19.1 4 281 -15 - 2 2 3 - 2 58 4 - 1 55 10 - 3 5 1 0.50 93 0 0 - 2 40 20 22 56 18.5 3 281 -14 - 2 12 21 - 3 8 25 - 2 5 27 - 3 15 23 0.51 94 0 0 - 2 51 7 22 56 18.1 2 281 -13 - 2 23 5 - 3 19 15 - 2 16 11 - 3 26 13 0.54 95 0 0 - 3 2 21 22 56 17.8 1 281 -13 - 2 34 17 - 3 30 31 - 2 27 22 - 3 37 30 0.60 96 0 0 - 3 14 2 22 56 17.7 0 281 -12 - 2 45 55 - 3 42 15 - 2 39 0 - 3 49 15 1.33 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 507-087295 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 47 44.5133 DE: +11 12 22.256 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 47 44.5133 DE: +11 12 22.256 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.500) * V mag [mag]: 10.0 * B mag [mag]: 12.4 * Diameter [mas]: 1.80 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (754) Malabar asteroid class: approx. diameter [km]: 89 approx. diameter ["]: 0.055 distance from Earth [AU]: 2.24240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#117 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): 0.016", 0.006", 84.768° remarks: * orbital elements for (754)Malabar : Mean anomaly = 160.3707972131 deg Arg. of pericenter = 302.9330048154 deg Long. of node = 179.9033640721 deg Inclination = 24.5420503423 deg Eccentricity = 0.0512920902 Semimajor axis = 2.9875730252 AU Perihelion dist = 2.8343341600 AU Mag: H = 9.24, G = 0.15 Epoch of elements : MJD 60503.96083067 TDT (2024 Jul 12.9608) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1172023Apr24,6.97,2024,7,12,23.059937,0.150035,-0.386777,-6.970866,-2.704014,0.000988,-0.003049,0.000001,0.000000 5.0001,11.2333,-164.45,21.79,False UCAC4 507-087295,18.79569813,11.2061821,12.42,9.99,8.68,1.8,4,,18.81521482,11.2332862,4.18,5.03,0,0,0 754,Malabar,14.14,92.386,2.2424,0,0,-1.858,-10.61,,4.6,0 0,160.1874,2024,7,12,302.9330,179.9034,24.5421,0.05129,2.98757,2.83433,9.24,5.0,0.15 1.124,0.0160,0.0057,85,0.0070,Known errors,1.05,0,-1,-1 20240712_087295,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org