IOTA/IOTA-ES occultation update for (402) Chloe / UCAC4 378-170695 event on 2023 Jul 04, 13:46 UT Visible from SE Australia Summary ------- On 2023 Jul 04 UT, the 56.2 km diameter asteroid (402) Chloe will occult a 11.4 mag star in the constellation Capricornus for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.21 mag to 13.46 mag (the magnitude of the asteroid) for at most 6.400 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: 2023 Jul 04, 13:33 - 2023 Jul 04, 13:58 * geocentric midpoint of event [JD]: 2460130.07376617 * magnitude of target star: 11.40 * magnitude drop [mag]: 2.21 * estimated maximum duration [s]: 6.400 * Moon: 98 % sunlit, 20° distance * Sun: 146° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.005", 78°) * approx speed of asteroid's shadow [km/s]: 8.7874 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 378-170695 by 402 Chloe on 2023 Jul 4 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 87 0 0 -34 54 45 13 58 17.8 0 107 -33 -34 38 48 -35 10 42 -34 34 7 -35 15 23 .... 88 0 0 -35 9 59 13 58 17.6 1 107 -34 -34 54 5 -35 25 52 -34 49 25 -35 30 32 0.04 89 0 0 -35 24 35 13 58 17.3 2 106 -35 -35 8 44 -35 40 25 -35 4 5 -35 45 4 0.00 90 0 0 -35 38 34 13 58 16.9 3 106 -36 -35 22 46 -35 54 21 -35 18 8 -35 58 59 -0.01 91 0 0 -35 51 56 13 58 16.3 4 105 -36 -35 36 11 -36 7 41 -35 31 34 -36 12 18 -0.02 92 0 0 -36 4 42 13 58 15.5 5 105 -37 -35 49 0 -36 20 24 -35 44 23 -36 25 0 -0.03 93 0 0 -36 16 52 13 58 14.6 5 104 -38 -36 1 13 -36 32 31 -35 56 37 -36 37 7 -0.03 94 0 0 -36 28 27 13 58 13.5 6 103 -39 -36 12 50 -36 44 4 -36 8 15 -36 48 39 -0.03 95 0 0 -36 39 26 13 58 12.3 7 103 -40 -36 23 52 -36 55 1 -36 19 18 -36 59 35 -0.04 96 0 0 -36 49 51 13 58 11.0 8 102 -40 -36 34 19 -37 5 24 -36 29 45 -37 9 57 -0.04 97 0 0 -36 59 42 13 58 9.5 9 102 -41 -36 44 11 -37 15 12 -36 39 38 -37 19 45 -0.04 98 0 0 -37 8 58 13 58 7.9 9 101 -42 -36 53 30 -37 24 26 -36 48 57 -37 28 58 -0.04 99 0 0 -37 17 40 13 58 6.1 10 100 -43 -37 2 14 -37 33 6 -36 57 42 -37 37 38 -0.04 100 0 0 -37 25 49 13 58 4.3 11 100 -44 -37 10 24 -37 41 13 -37 5 53 -37 45 45 -0.04 101 0 0 -37 33 24 13 58 2.3 12 99 -44 -37 18 1 -37 48 47 -37 13 31 -37 53 18 -0.04 102 0 0 -37 40 27 13 58 0.1 13 99 -45 -37 25 5 -37 55 48 -37 20 35 -38 0 18 -0.04 103 0 0 -37 46 56 13 57 57.8 13 98 -46 -37 31 36 -38 2 16 -37 27 6 -38 6 46 -0.04 104 0 0 -37 52 53 13 57 55.4 14 97 -47 -37 37 35 -38 8 12 -37 33 5 -38 12 41 -0.04 105 0 0 -37 58 18 13 57 52.9 15 97 -47 -37 43 0 -38 13 35 -37 38 31 -38 18 4 -0.04 106 0 0 -38 3 10 13 57 50.3 16 96 -48 -37 47 54 -38 18 26 -37 43 25 -38 22 55 -0.04 107 0 0 -38 7 31 13 57 47.5 17 96 -49 -37 52 15 -38 22 46 -37 47 46 -38 27 14 -0.04 108 0 0 -38 11 19 13 57 44.6 17 95 -50 -37 56 4 -38 26 33 -37 51 36 -38 31 2 -0.04 109 0 0 -38 14 36 13 57 41.6 18 94 -51 -37 59 22 -38 29 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52 13 27 5 29 -0.06 -116 0 0 28 2 33 13 35 15.2 25 236 8 28 20 33 27 44 34 28 25 50 27 39 17 -0.06 -115 0 0 28 35 35 13 35 9.9 24 237 9 28 53 30 28 17 40 28 58 46 28 12 25 -0.06 -114 0 0 29 7 57 13 35 4.9 23 237 10 29 25 47 28 50 7 29 31 1 28 44 53 -0.06 -113 0 0 29 39 37 13 35 0.1 22 238 11 29 57 23 29 21 52 30 2 36 29 16 40 -0.06 -112 0 0 30 10 38 13 34 55.5 21 238 12 30 28 19 29 52 57 30 33 30 29 47 46 -0.05 -111 0 0 30 40 57 13 34 51.2 20 239 13 30 58 33 30 23 21 31 3 43 30 18 11 -0.05 -110 0 0 31 10 36 13 34 47.2 19 239 14 31 28 7 30 53 5 31 33 16 30 47 56 -0.05 -109 0 0 31 39 34 13 34 43.3 18 240 15 31 57 1 31 22 7 32 2 8 31 17 0 -0.05 -108 0 0 32 7 51 13 34 39.7 17 240 16 32 25 14 31 50 29 32 30 19 31 45 24 -0.05 -107 0 0 32 35 28 13 34 36.4 16 241 16 32 52 46 32 18 11 32 57 50 32 13 7 -0.05 -106 0 0 33 2 25 13 34 33.2 15 241 17 33 19 38 32 45 12 33 24 41 32 40 9 -0.05 -105 0 0 33 28 41 13 34 30.3 14 242 18 33 45 50 33 11 33 33 50 52 33 6 32 -0.05 -104 0 0 33 54 18 13 34 27.5 13 242 19 34 11 22 33 37 14 34 16 22 33 32 14 -0.05 -103 0 0 34 19 15 13 34 25.0 12 243 20 34 36 14 34 2 16 34 41 13 33 57 17 -0.05 -102 0 0 34 43 32 13 34 22.7 11 244 21 35 0 27 34 26 37 35 5 24 34 21 39 -0.05 -101 0 0 35 7 9 13 34 20.6 10 244 22 35 24 0 34 50 19 35 28 56 34 45 23 -0.05 -100 0 0 35 30 8 13 34 18.6 9 245 23 35 46 54 35 13 22 35 51 49 35 8 27 -0.05 - 99 0 0 35 52 28 13 34 16.9 9 245 24 36 9 10 35 35 46 36 14 4 35 30 52 -0.04 - 98 0 0 36 14 9 13 34 15.3 8 246 24 36 30 47 35 57 32 36 35 40 35 52 39 -0.04 - 97 0 0 36 35 12 13 34 13.9 7 246 25 36 51 46 36 18 39 36 56 37 36 13 47 -0.04 - 96 0 0 36 55 37 13 34 12.7 6 247 26 37 12 7 36 39 8 37 16 57 36 34 18 -0.04 - 95 0 0 37 15 25 13 34 11.7 5 248 27 37 31 50 36 58 59 37 36 39 36 54 10 -0.04 - 94 0 0 37 34 35 13 34 10.9 4 248 28 37 50 56 37 18 13 37 55 44 37 13 25 -0.03 - 93 0 0 37 53 8 13 34 10.2 3 249 29 38 9 25 37 36 50 38 14 12 37 32 3 -0.03 - 92 0 0 38 11 4 13 34 9.6 2 249 29 38 27 18 37 54 50 38 32 4 37 50 4 -0.02 - 91 0 0 38 28 24 13 34 9.3 2 250 30 38 44 34 38 12 13 38 49 19 38 7 29 0.00 - 90 0 0 38 45 7 13 34 9.0 1 251 31 39 1 14 38 29 1 39 5 58 38 24 17 0.04 - 89 0 0 39 1 15 13 34 9.0 0 251 32 .. .. .. 38 45 12 .. .. .. 38 40 29 7.10 Uncertainty in time = +/- 1 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 378-170695 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 13 59.9975 DE: -14 32 39.779 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 13 59.9976 DE: -14 32 39.779 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (402) Chloe asteroid class: Barbarian approx. diameter [km]: 56 approx. diameter ["]: 0.040 distance from Earth [AU]: 1.92230 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#106 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): 0.009", 0.005", 78.488° remarks: * orbital elements for (402)Chloe : Mean anomaly = 152.9722929535 deg Arg. of pericenter = 17.1196581987 deg Long. of node = 129.3315225248 deg Inclination = 11.8334423343 deg Eccentricity = 0.1123480081 Semimajor axis = 2.5579844730 AU Perihelion dist = 2.2706000127 AU Mag: H = 9.05, G = 0.15 Epoch of elements : MJD 60129.57368056 TDT (2023 Jul 04.5737) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1062023Apr24,6.40,2023,7,4,13.770388,-0.023720,0.030161,-3.900187,-3.064133,-0.002954,-0.001042,0.000001,0.000000 -170.0435,-14.4468,-25.44,22.86,False UCAC4 378-170695,21.23333264,-14.5443832,0.00,11.40,0.00,0.0,0,,21.25508769,-14.4468144,2.21,0.00,0,0,0 402,Chloe,13.46,56.2,1.9223,0,0,-1.228,-14.02,,3.8,0 0,152.8341,2023,7,4,17.1197,129.3315,11.8334,0.11235,2.55798,2.27060,9.07,5.0,0.15 1.147,0.0093,0.0047,78,0.0059,Known errors,-1.00,-1,-1,-1 20230704_170695,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 03:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org