IOTA/IOTA-ES occultation update for (9840) 1988 RQ2 / UCAC4 315-130014 event on 2024 Oct 24, 01:46 UT Visible from Summary ------- On 2024 Oct 24 UT, the 12.5872521660321 km diameter asteroid (9840) 1988 RQ2 will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.83 mag to 18.23 mag (the magnitude of the asteroid) for at most 0.390 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: 96 * date and approx. time of event: 2024 Oct 24, 01:43 - 2024 Oct 24, 01:48 * geocentric midpoint of event [JD]: 2460607.57389008 * magnitude of target star: 11.40 * magnitude drop [mag]: 6.83 * estimated maximum duration [s]: 0.390 * Moon: 52 % sunlit, 152° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 80°) * approx speed of asteroid's shadow [km/s]: 33.0430 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 315-130014 by 9840 1988 RQ2 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 97 0 0 -41 11 46 1 43 53.9 1 126 35 -41 17 22 -41 6 11 -41 21 58 -41 1 36 .... 98 0 0 -41 45 54 1 43 54.0 2 126 36 -41 51 30 -41 40 18 -41 56 6 -41 35 43 0.73 99 0 0 -42 19 50 1 43 54.2 3 125 36 -42 25 27 -42 14 14 -42 30 3 -42 9 39 0.76 100 0 0 -42 53 34 1 43 54.4 4 124 37 -42 59 12 -42 47 58 -43 3 48 -42 43 22 0.77 101 0 0 -43 27 6 1 43 54.7 4 124 37 -43 32 43 -43 21 29 -43 37 20 -43 16 53 0.78 102 0 0 -44 0 22 1 43 55.1 5 123 38 -44 6 0 -43 54 45 -44 10 37 -43 50 9 0.79 103 0 0 -44 33 23 1 43 55.5 6 122 38 -44 39 1 -44 27 46 -44 43 38 -44 23 10 0.79 104 0 0 -45 6 8 1 43 55.9 7 121 39 -45 11 46 -45 0 31 -45 16 23 -44 55 55 0.79 105 0 0 -45 38 35 1 43 56.4 8 121 39 -45 44 13 -45 32 58 -45 48 50 -45 28 22 0.80 106 0 0 -46 10 44 1 43 57.0 9 120 39 -46 16 22 -46 5 7 -46 20 59 -46 0 31 0.80 107 0 0 -46 42 33 1 43 57.6 10 119 40 -46 48 11 -46 36 56 -46 52 48 -46 32 20 0.80 108 0 0 -47 14 2 1 43 58.3 11 119 40 -47 19 39 -47 8 25 -47 24 16 -47 3 49 0.80 109 0 0 -47 45 10 1 43 59.0 12 118 40 -47 50 47 -47 39 33 -47 55 23 -47 34 57 0.80 110 0 0 -48 15 55 1 43 59.8 12 117 41 -48 21 32 -48 10 19 -48 26 9 -48 5 44 0.80 111 0 0 -48 46 18 1 44 0.6 13 116 41 -48 51 55 -48 40 42 -48 56 31 -48 36 7 0.80 112 0 0 -49 16 18 1 44 1.4 14 115 41 -49 21 54 -49 10 42 -49 26 30 -49 6 8 0.80 113 0 0 -49 45 53 1 44 2.3 15 115 41 -49 51 29 -49 40 18 -49 56 4 -49 35 44 0.80 114 0 0 -50 15 4 1 44 3.3 16 114 42 -50 20 39 -50 9 29 -50 25 14 -50 4 56 0.80 115 0 0 -50 43 49 1 44 4.2 16 113 42 -50 49 24 -50 38 16 -50 53 58 -50 33 42 0.81 116 0 0 -51 12 9 1 44 5.2 17 112 42 -51 17 43 -51 6 36 -51 22 17 -51 2 3 0.81 117 0 0 -51 40 3 1 44 6.2 18 111 42 -51 45 36 -51 34 30 -51 50 9 -51 29 58 0.81 118 0 0 -52 7 30 1 44 7.3 19 110 42 -52 13 2 -52 1 58 -52 17 35 -51 57 27 0.81 119 0 0 -52 34 30 1 44 8.4 19 110 42 -52 40 2 -52 28 59 -52 44 34 -52 24 28 0.81 120 0 0 -53 1 3 1 44 9.5 20 109 42 -53 6 34 -52 55 33 -53 11 5 -52 51 3 0.81 121 0 0 -53 27 8 1 44 10.6 21 108 42 -53 32 38 -53 21 39 -53 37 9 -53 17 10 0.81 122 0 0 -53 52 46 1 44 11.7 21 107 43 -53 58 15 -53 47 18 -54 2 45 -53 42 49 0.81 123 0 0 -54 17 56 1 44 12.9 22 106 43 -54 23 24 -54 12 28 -54 27 53 -54 8 0 0.81 124 0 0 -54 42 37 1 44 14.1 23 105 43 -54 48 4 -54 37 11 -54 52 33 -54 32 44 0.81 125 0 0 -55 6 51 1 44 15.3 23 104 43 -55 12 17 -55 1 26 -55 16 44 -54 56 59 0.81 126 0 0 -55 30 36 1 44 16.5 24 103 43 -55 36 1 -55 25 12 -55 40 27 -55 20 46 0.81 127 0 0 -55 53 53 1 44 17.8 25 102 43 -55 59 17 -55 48 30 -56 3 42 -55 44 5 0.81 128 0 0 -56 16 42 1 44 19.0 25 101 42 -56 22 4 -56 11 20 -56 26 29 -56 6 56 0.81 129 0 0 -56 39 2 1 44 20.3 26 100 42 -56 44 24 -56 33 41 -56 48 47 -56 29 19 0.81 130 0 0 -57 0 55 1 44 21.5 27 99 42 -57 6 15 -56 55 35 -57 10 38 -56 51 13 0.81 131 0 0 -57 22 19 1 44 22.8 27 98 42 -57 27 38 -57 17 0 -57 32 0 -57 12 40 0.81 132 0 0 -57 43 15 1 44 24.1 28 97 42 -57 48 33 -57 37 58 -57 52 54 -57 33 38 0.81 133 0 0 -58 3 44 1 44 25.4 28 96 42 -58 9 0 -57 58 28 -58 13 20 -57 54 9 0.81 134 0 0 -58 23 45 1 44 26.7 29 95 42 -58 29 0 -58 18 30 -58 33 19 -58 14 12 0.81 135 0 0 -58 43 18 1 44 28.0 29 94 42 -58 48 32 -58 38 5 -58 52 50 -58 33 48 0.81 136 0 0 -59 2 25 1 44 29.4 30 93 42 -59 7 37 -58 57 12 -59 11 54 -58 52 57 0.81 137 0 0 -59 21 4 1 44 30.7 31 92 42 -59 26 15 -59 15 53 -59 30 31 -59 11 38 0.81 138 0 0 -59 39 16 1 44 32.0 31 91 41 -59 44 27 -59 34 7 -59 48 41 -59 29 53 0.81 139 0 0 -59 57 2 1 44 33.3 32 90 41 -60 2 11 -59 51 54 -60 6 25 -59 47 41 0.81 140 0 0 -60 14 22 1 44 34.7 32 89 41 -60 19 30 -60 9 15 -60 23 42 -60 5 4 0.81 141 0 0 -60 31 16 1 44 36.0 33 88 41 -60 36 22 -60 26 10 -60 40 34 -60 22 0 0.81 142 0 0 -60 47 44 1 44 37.3 33 87 41 -60 52 49 -60 42 40 -60 56 59 -60 38 30 0.81 143 0 0 -61 3 47 1 44 38.6 34 86 41 -61 8 51 -60 58 44 -61 13 0 -60 54 35 0.81 144 0 0 -61 19 25 1 44 40.0 34 85 40 -61 24 27 -61 14 23 -61 28 35 -61 10 15 0.81 145 0 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24 -33 57 46 -33 37 57 0.86 - 55 0 0 -33 13 6 1 48 49.8 11 245 -40 -33 18 31 -33 7 40 -33 22 59 -33 3 14 0.87 - 54 0 0 -32 38 29 1 48 50.6 10 244 -41 -32 43 53 -32 33 4 -32 48 20 -32 28 39 0.87 - 53 0 0 -32 4 1 1 48 51.4 9 244 -41 -32 9 24 -31 58 38 -32 13 50 -31 54 13 0.88 - 52 0 0 -31 29 44 1 48 52.1 8 243 -42 -31 35 6 -31 24 22 -31 39 31 -31 19 58 0.89 - 51 0 0 -30 55 38 1 48 52.7 7 243 -43 -31 0 59 -30 50 17 -31 5 23 -30 45 55 0.90 - 50 0 0 -30 21 45 1 48 53.2 6 242 -44 -30 27 6 -30 16 26 -30 31 28 -30 12 4 0.91 - 49 0 0 -29 48 7 1 48 53.7 5 242 -45 -29 53 26 -29 42 48 -29 57 47 -29 38 28 0.94 - 48 0 0 -29 14 43 1 48 54.0 4 241 -46 -29 20 1 -29 9 26 -29 24 22 -29 5 7 0.97 - 47 0 0 -28 41 37 1 48 54.3 3 241 -47 -28 46 53 -28 36 21 -28 51 13 -28 32 2 1.02 - 46 0 0 -28 8 47 1 48 54.5 2 240 -48 -28 14 2 -28 3 32 -28 18 21 -27 59 15 1.12 - 45 0 0 -27 36 16 1 48 54.6 1 240 -48 -27 41 30 -27 31 2 -27 45 48 -27 26 46 1.44 - 44 0 0 .. .. .... .. .. .. .. .. .. -27 9 17 .. .. .. -27 13 34 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 315-130014 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 02 49.4484 DE: -27 07 10.182 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 02 49.4484 DE: -27 07 10.182 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * B mag [mag]: 12.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9840) 1988 RQ2 asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.11260 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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): 0.012", 0.002", 79.879° remarks: * orbital elements for (9840)1988 RQ2 : Mean anomaly = 77.5131807030 deg Arg. of pericenter = 251.9267638692 deg Long. of node = 311.0795168495 deg Inclination = 10.9176574644 deg Eccentricity = 0.0704194462 Semimajor axis = 2.7806589711 AU Perihelion dist = 2.5848465063 AU Mag: H = 12.62, G = 0.15 Epoch of elements : MJD 60607.07389008 TDT (2024 Oct 24.0739) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.39,2024,10,24,1.773362,0.088060,-0.618936,18.462259,2.642425,0.005032,-0.000150,-0.000001,0.000000 -148.4719,-27.1202,149.45,-11.87,False UCAC4 315-130014,18.04706905,-27.1194951,12.68,11.40,10.71,0.1,0,,18.07270686,-27.1202395,6.83,7.07,0,0,0 9840,1988 RQ2,18.23,12.813,3.1126,0,0,3.907,7.47,,1.2,0 0,77.2849,2024,10,23,251.9268,311.0795,10.9177,0.07042,2.78066,2.58485,12.62,5.0,0.15 1.410,0.0117,0.0023,80,0.0023,Known errors,0.58,0,-1,-1 20241024_130014,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org