IOTA/IOTA-ES occultation update for (2336) Xinjiang / UCAC4 331-121446 event on 2024 Jul 11, 15:00 UT Visible from Summary ------- On 2024 Jul 11 UT, the 21.864 km diameter asteroid (2336) Xinjiang will occult a 12.0 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 5.52 mag to 17.48 mag (the magnitude of the asteroid) for at most 1.740 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 11, 14:52 - 2024 Jul 11, 15:08 * geocentric midpoint of event [JD]: 2460503.12519925 * magnitude of target star: 11.97 * magnitude drop [mag]: 5.52 * estimated maximum duration [s]: 1.740 * Moon: 29 % sunlit, 93° distance * Sun: 158° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 94°) * approx speed of asteroid's shadow [km/s]: 12.5438 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 331-121446 by 2336 Xinjiang on 2024 Jul 11 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 29 0 0 16 52 57 15 8 12.8 1 115 20 16 59 59 16 45 56 17 3 16 16 42 38 .... 30 0 0 16 26 8 15 8 12.6 2 116 19 16 33 10 16 19 7 16 36 27 16 15 50 -0.19 31 0 0 15 59 25 15 8 12.2 3 116 18 16 6 26 15 52 25 16 9 43 15 49 8 -0.27 32 0 0 15 32 49 15 8 11.6 4 116 17 15 39 50 15 25 49 15 43 7 15 22 33 -0.30 33 0 0 15 6 21 15 8 10.8 5 116 16 15 13 21 14 59 21 15 16 38 14 56 5 -0.32 34 0 0 14 40 1 15 8 9.9 6 117 15 14 47 0 14 33 2 14 50 17 14 29 46 -0.33 35 0 0 14 13 50 15 8 8.7 7 117 14 14 20 48 14 6 51 14 24 5 14 3 35 -0.34 36 0 0 13 47 48 15 8 7.4 8 117 13 13 54 46 13 40 50 13 58 2 13 37 35 -0.35 37 0 0 13 21 56 15 8 5.9 9 117 12 13 28 54 13 14 59 13 32 10 13 11 44 -0.35 38 0 0 12 56 16 15 8 4.2 10 118 11 13 3 13 12 49 19 13 6 28 12 46 4 -0.36 39 0 0 12 30 47 15 8 2.3 11 118 10 12 37 43 12 23 51 12 40 58 12 20 36 -0.36 40 0 0 12 5 30 15 8 0.2 12 118 8 12 12 26 11 58 34 12 15 40 11 55 20 -0.36 41 0 0 11 40 25 15 7 58.0 13 118 7 11 47 21 11 33 31 11 50 35 11 30 17 -0.37 42 0 0 11 15 34 15 7 55.6 15 118 6 11 22 29 11 8 40 11 25 43 11 5 27 -0.37 43 0 0 10 50 57 15 7 53.0 16 119 5 10 57 51 10 44 4 11 1 5 10 40 50 -0.37 44 0 0 10 26 34 15 7 50.3 17 119 4 10 33 27 10 19 42 10 36 41 10 16 29 -0.37 45 0 0 10 2 26 15 7 47.3 18 119 3 10 9 19 9 55 34 10 12 32 9 52 22 -0.37 46 0 0 9 38 34 15 7 44.2 19 119 2 9 45 25 9 31 42 9 48 38 9 28 30 -0.37 47 0 0 9 14 57 15 7 41.0 20 120 1 9 21 48 9 8 7 9 25 0 9 4 55 -0.37 48 0 0 8 51 37 15 7 37.5 21 120 0 8 58 27 8 44 47 9 1 39 8 41 35 -0.37 49 0 0 8 28 33 15 7 33.9 22 120 -1 8 35 23 8 21 44 8 38 34 8 18 33 -0.38 50 0 0 8 5 47 15 7 30.2 23 120 -2 8 12 36 7 58 59 8 15 47 7 55 48 -0.38 51 0 0 7 43 19 15 7 26.3 24 120 -3 7 50 7 7 36 31 7 53 18 7 33 21 -0.38 52 0 0 7 21 9 15 7 22.2 25 121 -4 7 27 56 7 14 22 7 31 7 7 11 12 -0.38 53 0 0 6 59 17 15 7 18.0 26 121 -5 7 6 3 6 52 31 7 9 14 6 49 21 -0.38 54 0 0 6 37 44 15 7 13.6 27 121 -6 6 44 30 6 30 59 6 47 40 6 27 50 -0.38 55 0 0 6 16 31 15 7 9.0 28 121 -7 6 23 16 6 9 46 6 26 25 6 6 37 -0.38 56 0 0 5 55 37 15 7 4.4 29 121 -8 6 2 21 5 48 53 6 5 30 5 45 45 -0.38 57 0 0 5 35 4 15 6 59.6 30 122 -9 5 41 47 5 28 21 5 44 56 5 25 12 -0.38 58 0 0 5 14 50 15 6 54.6 31 122 -10 5 21 33 5 8 8 5 24 41 5 5 0 -0.38 59 0 0 4 54 58 15 6 49.5 32 122 -11 5 1 39 4 48 16 5 4 47 4 45 8 -0.38 60 0 0 4 35 26 15 6 44.3 33 122 -12 4 42 7 4 28 45 4 45 15 4 25 38 -0.38 61 0 0 4 16 15 15 6 38.9 34 123 -13 4 22 56 4 9 35 4 26 3 4 6 28 -0.38 62 0 0 3 57 27 15 6 33.4 35 123 -14 4 4 6 3 50 47 4 7 13 3 47 41 -0.38 63 0 0 3 38 59 15 6 27.8 36 123 -15 3 45 38 3 32 21 3 48 45 3 29 14 -0.38 64 0 0 3 20 54 15 6 22.1 37 123 -16 3 27 32 3 14 16 3 30 39 3 11 10 -0.38 65 0 0 3 3 11 15 6 16.2 38 124 -17 3 9 49 2 56 34 3 12 55 2 53 29 -0.38 66 0 0 2 45 51 15 6 10.2 39 124 -18 2 52 28 2 39 15 2 55 34 2 36 9 -0.38 67 0 0 2 28 53 15 6 4.2 40 124 -19 2 35 29 2 22 18 2 38 35 2 19 13 -0.38 68 0 0 2 12 19 15 5 58.0 41 125 -20 2 18 54 2 5 44 2 21 59 2 2 39 -0.38 69 0 0 1 56 7 15 5 51.6 42 125 -21 2 2 42 1 49 33 2 5 46 1 46 28 -0.38 70 0 0 1 40 19 15 5 45.2 43 125 -22 1 46 53 1 33 45 1 49 57 1 30 41 -0.38 71 0 0 1 24 54 15 5 38.7 44 126 -23 1 31 27 1 18 21 1 34 31 1 15 17 -0.38 72 0 0 1 9 52 15 5 32.1 45 126 -24 1 16 25 1 3 20 1 19 29 1 0 16 -0.38 73 0 0 0 55 14 15 5 25.4 45 126 -25 1 1 46 0 48 43 1 4 50 0 45 39 -0.38 74 0 0 0 41 1 15 5 18.6 46 127 -26 0 47 32 0 34 29 0 50 35 0 31 27 -0.38 75 0 0 0 27 11 15 5 11.6 47 127 -27 0 33 42 0 20 40 0 36 45 0 17 38 -0.38 76 0 0 0 13 45 15 5 4.7 48 128 -28 0 20 15 0 7 15 0 23 18 0 4 13 -0.38 77 0 0 0 0 44 15 4 57.6 49 128 -29 0 7 13 - 0 5 46 0 10 16 - 0 8 48 -0.38 78 0 0 - 0 11 54 15 4 50.4 50 129 -30 - 0 5 25 - 0 18 22 - 0 2 22 - 0 21 24 -0.38 79 0 0 - 0 24 6 15 4 43.2 51 129 -31 - 0 17 38 - 0 30 35 - 0 14 36 - 0 33 36 -0.38 80 0 0 - 0 35 55 15 4 35.8 52 130 -32 - 0 29 27 - 0 42 22 - 0 26 25 - 0 45 24 -0.38 81 0 0 - 0 47 18 15 4 28.5 53 130 -33 - 0 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39 3 14 18 34 -0.40 -178 0 0 14 54 56 14 52 36.5 13 240 -33 15 1 55 14 47 57 15 5 11 14 44 41 -0.40 -177 0 0 15 21 12 14 52 34.3 12 241 -32 15 28 11 15 14 12 15 31 28 15 10 56 -0.40 -176 0 0 15 47 35 14 52 32.2 11 241 -31 15 54 35 15 40 35 15 57 52 15 37 19 -0.40 -175 0 0 16 14 6 14 52 30.4 10 241 -30 16 21 7 16 7 6 16 24 24 16 3 49 -0.40 -174 0 0 16 40 43 14 52 28.7 9 242 -29 16 47 44 16 33 42 16 51 1 16 30 25 -0.40 -173 0 0 17 7 26 14 52 27.2 8 242 -28 17 14 27 17 0 24 17 17 45 16 57 7 -0.40 -172 0 0 17 34 13 14 52 25.9 7 242 -27 17 41 15 17 27 12 17 44 33 17 23 55 -0.40 -171 0 0 18 1 5 14 52 24.7 6 243 -26 18 8 8 17 54 3 18 11 26 17 50 46 -0.40 -170 0 0 18 28 1 14 52 23.7 5 243 -25 18 35 4 18 20 59 18 38 22 18 17 41 -0.40 -169 0 0 18 55 0 14 52 23.0 4 243 -24 19 2 3 18 47 57 19 5 21 18 44 39 -0.40 -168 0 0 19 22 0 14 52 22.4 3 243 -23 19 29 4 19 14 57 19 32 22 19 11 39 -0.41 -167 0 0 19 49 2 14 52 22.0 2 244 -22 19 56 6 19 41 59 19 59 24 19 38 41 -0.42 -166 0 0 20 16 5 14 52 21.7 1 244 -21 20 23 9 20 9 2 20 26 27 20 5 44 -0.44 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 331-121446 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 48 29.0868 DE: -23 49 42.134 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 48 29.0868 DE: -23 49 42.134 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2336) Xinjiang asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.64370 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.020", 0.002", 93.855° remarks: * orbital elements for (2336)Xinjiang : Mean anomaly = 138.7009835166 deg Arg. of pericenter = 36.9512291299 deg Long. of node = 87.2071841087 deg Inclination = 2.7871876876 deg Eccentricity = 0.1626203370 Semimajor axis = 3.1859630621 AU Perihelion dist = 2.6678606754 AU Mag: H = 12.11, G = 0.15 Epoch of elements : MJD 60502.62519958 TDT (2024 Jul 11.6252) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,1.74,2024,7,11,15.004782,-0.011654,0.352473,-7.076222,-0.233799,0.002174,0.000000,0.000001,0.000000 112.4163,-23.8373,-43.66,21.98,False UCAC4 331-121446,17.80807968,-23.8283705,12.56,11.97,11.65,0.0,0,,17.83337425,-23.8372704,5.52,5.39,0,0,0 2336,Xinjiang,17.48,21.864,2.6437,0,0,-1.715,-0.78,,1.8,0 0,138.5926,2024,7,11,36.9512,87.2072,2.7872,0.16262,3.18596,2.66786,12.11,5.0,0.15 1.234,0.0203,0.0017,94,0.0027,Known errors,0.74,0,-1,-1 20240711_121446,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org