IOTA/IOTA-ES occultation update for (733) Mocia / TYC 8366-00307-1 event on 2023 Jun 25, 02:10 UT Visible from Africa, South America Summary ------- On 2023 Jun 25 UT, the 96.3 km diameter asteroid (733) Mocia will occult a 10.8 mag star in the constellation Telescopium for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.72 mag to 14.44 mag (the magnitude of the asteroid) for at most 7.070 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: 100 * date and approx. time of event: 2023 Jun 25, 02:03 - 2023 Jun 25, 02:18 * geocentric midpoint of event [JD]: 2460120.59082112 * magnitude of target star: 10.76 * magnitude drop [mag]: 3.72 * estimated maximum duration [s]: 7.070 * Moon: 38 % sunlit, 105° distance * Sun: 154° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 107 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.004", 85°) * approx speed of asteroid's shadow [km/s]: 13.6208 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 8366-00307-1 by 733 Mocia on 2023 Jun 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 - 96 0 0 19 18 3 2 17 49.1 1 144 -16 20 8 15 18 28 29 .. .. .. 18 18 46 .... - 95 0 0 17 59 56 2 17 48.7 2 145 -17 18 49 32 17 10 55 18 59 23 17 1 20 -0.24 - 94 0 0 16 42 40 2 17 48.0 4 145 -19 17 31 40 15 54 14 17 41 23 15 44 45 -0.35 - 93 0 0 15 26 20 2 17 46.8 5 145 -20 16 14 44 14 38 30 16 24 21 14 29 8 -0.39 - 92 0 0 14 11 3 2 17 45.3 7 146 -22 14 58 50 13 23 47 15 8 19 13 14 32 -0.42 - 91 0 0 12 56 49 2 17 43.3 9 146 -23 13 44 1 12 10 9 13 53 23 12 1 0 -0.44 - 90 0 0 11 43 44 2 17 41.1 10 146 -25 12 30 21 10 57 38 12 39 35 10 48 36 -0.45 - 89 0 0 10 31 51 2 17 38.4 12 146 -26 11 17 51 9 46 19 11 26 59 9 37 24 -0.46 - 88 0 0 9 21 11 2 17 35.5 13 146 -28 10 6 37 8 36 13 10 15 37 8 27 24 -0.46 - 87 0 0 8 11 47 2 17 32.2 15 147 -29 8 56 39 7 27 23 9 5 32 7 18 41 -0.47 - 86 0 0 7 3 42 2 17 28.6 16 147 -31 7 47 59 6 19 50 7 56 46 6 11 14 -0.47 - 85 0 0 5 56 56 2 17 24.7 18 147 -32 6 40 40 5 13 36 6 49 20 5 5 7 -0.47 - 84 0 0 4 51 30 2 17 20.6 19 147 -33 5 34 41 4 8 43 5 43 15 4 0 20 -0.48 - 83 0 0 3 47 27 2 17 16.1 21 147 -35 4 30 6 3 5 10 4 38 33 2 56 53 -0.48 - 82 0 0 2 44 45 2 17 11.5 22 147 -36 3 26 53 2 3 0 3 35 14 1 54 48 -0.48 - 81 0 0 1 43 27 2 17 6.6 23 148 -38 2 25 4 1 2 11 2 33 19 0 54 6 -0.48 - 80 0 0 0 43 32 2 17 1.4 25 148 -39 1 24 39 0 2 46 1 32 48 - 0 5 14 -0.48 - 79 0 0 - 0 15 0 2 16 56.1 26 148 -40 0 25 38 - 0 55 18 0 33 41 - 1 3 12 -0.48 - 78 0 0 - 1 12 8 2 16 50.6 27 148 -42 - 0 31 59 - 1 51 58 - 0 24 1 - 1 59 47 -0.48 - 77 0 0 - 2 7 53 2 16 44.9 29 148 -43 - 1 28 12 - 2 47 17 - 1 20 20 - 2 55 0 -0.48 - 76 0 0 - 3 2 16 2 16 39.0 30 148 -44 - 2 23 1 - 3 41 13 - 2 15 15 - 3 48 52 -0.48 - 75 0 0 - 3 55 17 2 16 33.0 31 149 -45 - 3 16 28 - 4 33 48 - 3 8 47 - 4 41 22 -0.49 - 74 0 0 - 4 46 56 2 16 26.8 32 149 -47 - 4 8 33 - 5 25 2 - 4 0 57 - 5 32 31 -0.49 - 73 0 0 - 5 37 14 2 16 20.5 34 149 -48 - 4 59 16 - 6 14 56 - 4 51 45 - 6 22 21 -0.49 - 72 0 0 - 6 26 13 2 16 14.0 35 149 -49 - 5 48 39 - 7 3 31 - 5 41 12 - 7 10 51 -0.49 - 71 0 0 - 7 13 52 2 16 7.5 36 149 -50 - 6 36 41 - 7 50 47 - 6 29 19 - 7 58 2 -0.49 - 70 0 0 - 8 0 12 2 16 0.8 37 149 -52 - 7 23 24 - 8 36 46 - 7 16 7 - 8 43 56 -0.49 - 69 0 0 - 8 45 15 2 15 54.1 38 150 -53 - 8 8 49 - 9 21 27 - 8 1 37 - 9 28 34 -0.49 - 68 0 0 - 9 29 2 2 15 47.3 39 150 -54 - 8 52 58 -10 4 53 - 8 45 49 -10 11 56 -0.49 - 67 0 0 -10 11 34 2 15 40.4 40 150 -55 - 9 35 50 -10 47 4 - 9 28 45 -10 54 3 -0.49 - 66 0 0 -10 52 51 2 15 33.4 42 150 -56 -10 17 27 -11 28 2 -10 10 26 -11 34 56 -0.49 - 65 0 0 -11 32 54 2 15 26.3 43 151 -58 -10 57 50 -12 7 46 -10 50 53 -12 14 37 -0.49 - 64 0 0 -12 11 46 2 15 19.2 44 151 -59 -11 37 0 -12 46 19 -11 30 7 -12 53 7 -0.49 - 63 0 0 -12 49 26 2 15 12.1 45 151 -60 -12 14 58 -13 23 42 -12 8 9 -13 30 25 -0.48 - 62 0 0 -13 25 56 2 15 4.9 46 151 -61 -12 51 45 -13 59 54 -12 45 0 -14 6 35 -0.48 - 61 0 0 -14 1 17 2 14 57.6 47 152 -62 -13 27 23 -14 34 59 -13 20 41 -14 41 36 -0.48 - 60 0 0 -14 35 30 2 14 50.3 47 152 -63 -14 1 53 -15 8 55 -13 55 14 -15 15 30 -0.48 - 59 0 0 -15 8 36 2 14 43.0 48 153 -64 -14 35 14 -15 41 46 -14 28 39 -15 48 17 -0.48 - 58 0 0 -15 40 36 2 14 35.7 49 153 -65 -15 7 30 -16 13 31 -15 0 57 -16 19 59 -0.48 - 57 0 0 -16 11 31 2 14 28.3 50 153 -66 -15 38 39 -16 44 12 -15 32 10 -16 50 37 -0.48 - 56 0 0 -16 41 22 2 14 21.0 51 154 -67 -16 8 45 -17 13 49 -16 2 18 -17 20 12 -0.48 - 55 0 0 -17 10 10 2 14 13.6 52 154 -68 -16 37 47 -17 42 24 -16 31 23 -17 48 44 -0.48 - 54 0 0 -17 37 57 2 14 6.2 53 155 -69 -17 5 47 -18 9 58 -16 59 25 -18 16 15 -0.48 - 53 0 0 -18 4 42 2 13 58.7 53 156 -70 -17 32 45 -18 36 31 -17 26 25 -18 42 46 -0.48 - 52 0 0 -18 30 28 2 13 51.3 54 156 -71 -17 58 42 -19 2 4 -17 52 25 -19 8 17 -0.48 - 51 0 0 -18 55 14 2 13 43.9 55 157 -72 -18 23 40 -19 26 39 -18 17 26 -19 32 49 -0.48 - 50 0 0 -19 19 2 2 13 36.5 56 157 -73 -18 47 39 -19 50 16 -18 41 27 -19 56 24 -0.48 - 49 0 0 -19 41 53 2 13 29.0 56 158 -74 -19 10 40 -20 12 56 -19 4 30 -20 19 2 -0.48 - 48 0 0 -20 3 46 2 13 21.6 57 159 -75 -19 32 44 -20 34 40 -19 26 36 -20 40 44 -0.48 - 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Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 8366-00307-1 * constellation : Telescopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 21 40.6053 DE: -49 46 36.317 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 21 40.6053 DE: -49 46 36.318 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (733) Mocia asteroid class: approx. diameter [km]: 96 approx. diameter ["]: 0.053 distance from Earth [AU]: 2.49010 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 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): 0.021", 0.004", 85.297° remarks: * orbital elements for (733)Mocia : Mean anomaly = 96.1302359766 deg Arg. of pericenter = 188.6994379659 deg Long. of node = 340.9651835818 deg Inclination = 20.2873479984 deg Eccentricity = 0.0580626566 Semimajor axis = 3.3980090432 AU Perihelion dist = 3.2007116110 AU Mag: H = 9.26, G = 0.15 Epoch of elements : MJD 60120.09069444 TDT (2023 Jun 25.0907) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,7.07,2023,6,25,2.179707,0.044775,0.429467,-7.646537,0.797140,-0.000176,0.002523,0.000001,0.000000 -29.7832,-49.7657,147.95,23.40,False TYC 8366-00307-1,18.36127925,-49.7767547,0.00,10.76,0.00,0.0,0,,18.39196116,-49.7657284,3.72,0.00,0,0,0 733,Mocia,14.44,96.3,2.4901,0,0,-2.787,2.82,,5.8,0 0,96.1160,2023,6,25,188.6994,340.9652,20.2873,0.05806,3.39801,3.20071,9.24,5.0,0.15 1.099,0.0207,0.0037,85,0.0053,Known errors,-1.00,-1,-1,-1 20230625_0307-1,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org