IOTA/IOTA-ES occultation update for (9840) 1988 RQ2 / UCAC4 307-114016 event on 2024 Sep 18, 02:22 UT Visible from Summary ------- On 2024 Sep 18 UT, the 12.5427025358627 km diameter asteroid (9840) 1988 RQ2 will occult a 11.7 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.24 mag to 17.95 mag (the magnitude of the asteroid) for at most 0.600 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: 94 * date and approx. time of event: 2024 Sep 18, 02:17 - 2024 Sep 18, 02:27 * geocentric midpoint of event [JD]: 2460571.59899013 * magnitude of target star: 11.71 * magnitude drop [mag]: 6.24 * estimated maximum duration [s]: 0.600 * Moon: 100 % sunlit, 95° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.003", 86°) * approx speed of asteroid's shadow [km/s]: 21.3608 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 307-114016 by 9840 1988 RQ2 on 2024 Sep 18 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 123 0 0 -25 3 47 2 17 49.9 1 121 56 -25 8 5 -24 59 29 -25 11 57 -24 55 38 .... 124 0 0 -25 37 36 2 17 50.1 2 121 57 -25 41 54 -25 33 18 -25 45 45 -25 29 27 0.35 125 0 0 -26 11 10 2 17 50.3 3 121 57 -26 15 28 -26 6 53 -26 19 20 -26 3 2 0.35 126 0 0 -26 44 29 2 17 50.7 4 120 57 -26 48 47 -26 40 12 -26 52 38 -26 36 21 0.35 127 0 0 -27 17 32 2 17 51.2 5 120 57 -27 21 49 -27 13 15 -27 25 40 -27 9 24 0.35 128 0 0 -27 50 17 2 17 51.8 6 119 57 -27 54 34 -27 46 1 -27 58 25 -27 42 10 0.35 129 0 0 -28 22 45 2 17 52.4 7 119 57 -28 27 1 -28 18 28 -28 30 51 -28 14 38 0.35 130 0 0 -28 54 53 2 17 53.2 8 118 57 -28 59 9 -28 50 37 -29 2 59 -28 46 47 0.35 131 0 0 -29 26 41 2 17 54.1 9 118 57 -29 30 57 -29 22 26 -29 34 47 -29 18 36 0.35 132 0 0 -29 58 10 2 17 55.0 10 117 56 -30 2 25 -29 53 54 -30 6 14 -29 50 5 0.35 133 0 0 -30 29 17 2 17 56.1 11 117 56 -30 33 31 -30 25 2 -30 37 20 -30 21 13 0.35 134 0 0 -31 0 2 2 17 57.2 12 116 56 -31 4 16 -30 55 48 -31 8 5 -30 51 59 0.34 135 0 0 -31 30 25 2 17 58.5 13 116 56 -31 34 39 -31 26 11 -31 38 27 -31 22 23 0.34 136 0 0 -32 0 25 2 17 59.8 14 115 56 -32 4 38 -31 56 11 -32 8 26 -31 52 24 0.34 137 0 0 -32 30 1 2 18 1.2 15 115 55 -32 34 14 -32 25 48 -32 38 1 -32 22 1 0.34 138 0 0 -32 59 13 2 18 2.6 16 114 55 -33 3 25 -32 55 1 -33 7 12 -32 51 15 0.34 139 0 0 -33 28 1 2 18 4.2 17 113 55 -33 32 12 -33 23 49 -33 35 59 -33 20 3 0.34 140 0 0 -33 56 24 2 18 5.8 18 113 54 -34 0 35 -33 52 13 -34 4 20 -33 48 27 0.34 141 0 0 -34 24 21 2 18 7.5 19 112 54 -34 28 31 -34 20 10 -34 32 16 -34 16 26 0.34 142 0 0 -34 51 52 2 18 9.2 20 112 53 -34 56 2 -34 47 43 -34 59 47 -34 43 58 0.34 143 0 0 -35 18 58 2 18 11.1 21 111 53 -35 23 7 -35 14 49 -35 26 51 -35 11 5 0.34 144 0 0 -35 45 36 2 18 12.9 22 110 53 -35 49 45 -35 41 28 -35 53 28 -35 37 45 0.34 145 0 0 -36 11 49 2 18 14.9 23 110 52 -36 15 56 -36 7 41 -36 19 39 -36 3 58 0.34 146 0 0 -36 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0 0 -15 36 43 2 27 4.8 15 244 -68 -15 41 0 -15 32 26 -15 44 52 -15 28 34 0.37 - 54 0 0 -15 0 58 2 27 6.4 14 244 -70 -15 5 15 -14 56 41 -15 9 6 -14 52 50 0.37 - 53 0 0 -14 25 18 2 27 7.9 13 243 -71 -14 29 35 -14 21 1 -14 33 25 -14 17 11 0.37 - 52 0 0 -13 49 44 2 27 9.2 12 243 -72 -13 54 1 -13 45 28 -13 57 51 -13 41 38 0.38 - 51 0 0 -13 14 19 2 27 10.5 11 243 -73 -13 18 35 -13 10 3 -13 22 25 -13 6 13 0.38 - 50 0 0 -12 39 2 2 27 11.6 10 243 -74 -12 43 17 -12 34 46 -12 47 7 -12 30 57 0.38 - 49 0 0 -12 3 54 2 27 12.6 8 242 -75 -12 8 9 -11 59 39 -12 11 59 -11 55 50 0.39 - 48 0 0 -11 28 58 2 27 13.4 7 242 -76 -11 33 13 -11 24 44 -11 37 2 -11 20 55 0.40 - 47 0 0 -10 54 14 2 27 14.2 6 242 -77 -10 58 28 -10 50 0 -11 2 16 -10 46 12 0.41 - 46 0 0 -10 19 43 2 27 14.8 5 242 -78 -10 23 57 -10 15 30 -10 27 44 -10 11 42 0.42 - 45 0 0 - 9 45 26 2 27 15.3 4 242 -80 - 9 49 39 - 9 41 13 - 9 53 26 - 9 37 26 0.44 - 44 0 0 - 9 11 24 2 27 15.6 3 241 -81 - 9 15 37 - 9 7 12 - 9 19 24 - 9 3 26 0.48 - 43 0 0 - 8 37 39 2 27 15.9 2 241 -82 - 8 41 51 - 8 33 27 - 8 45 37 - 8 29 41 0.57 - 42 0 0 - 8 4 10 2 27 16.0 0 241 -83 - 8 8 21 - 7 59 59 - 8 12 7 - 7 56 14 1.11 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 307-114016 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 12 15.4388 DE: -28 41 33.988 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 12 15.4388 DE: -28 41 33.988 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.7 * B mag [mag]: 13.0 * 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 ["]: 0.007 distance from Earth [AU]: 2.63760 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): 0.014", 0.003", 86.187° remarks: * orbital elements for (9840)1988 RQ2 : Mean anomaly = 69.8427934476 deg Arg. of pericenter = 251.9510045756 deg Long. of node = 311.0800998174 deg Inclination = 10.9174342915 deg Eccentricity = 0.0704156640 Semimajor axis = 2.7807389809 AU Perihelion dist = 2.5849313991 AU Mag: H = 12.62, G = 0.15 Epoch of elements : MJD 60571.09899000 TDT (2024 Sep 18.0990) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.60,2024,9,18,2.375763,0.052610,-0.312741,11.887497,2.012550,0.005578,-0.000505,0.000000,0.000000 -134.6871,-28.7239,142.89,1.72,False UCAC4 307-114016,17.20428858,-28.6927746,13.00,11.71,11.01,0.1,0,,17.23020084,-28.7238739,6.24,6.49,0,0,0 9840,1988 RQ2,17.95,12.734,2.6376,0,0,3.013,6.71,,1.2,0 0,69.8218,2024,9,18,251.9510,311.0801,10.9174,0.07042,2.78074,2.58493,12.62,5.0,0.15 1.449,0.0137,0.0027,86,0.0030,Known errors,0.94,0,-1,-1 20240918_114016,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org