IOTA/IOTA-ES occultation update for (94) Aurora / UCAC4 296-160055 event on 2023 Oct 07, 06:50 UT Visible from New Zealand Summary ------- On 2023 Oct 07 UT, the 185.6 km diameter asteroid (94) Aurora will occult a 12.2 mag star in the constellation Sagittarius for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.91 mag to 13.90 mag (the magnitude of the asteroid) for at most 8.640 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 Oct 07, 06:45 - 2023 Oct 07, 06:54 * geocentric midpoint of event [JD]: 2460224.78471341 * magnitude of target star: 12.20 * magnitude drop [mag]: 1.91 * estimated maximum duration [s]: 8.640 * Moon: 43 % sunlit, 161° distance * Sun: 79° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 192 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.005, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.001", 89°) * approx speed of asteroid's shadow [km/s]: 21.4738 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 296-160055 by 94 Aurora on 2023 Oct 7 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 52 0 0 -22 25 22 6 45 12.0 0 124 62 -23 28 13 .. .. .. -23 30 49 .. .. .. .... 53 0 0 -23 2 24 6 45 12.1 2 123 62 -24 5 11 -21 59 59 -24 7 48 -21 57 24 0.29 54 0 0 -23 39 9 6 45 12.4 3 123 62 -24 41 52 -22 36 49 -24 44 28 -22 34 14 0.28 55 0 0 -24 15 36 6 45 12.7 4 122 63 -25 18 13 -23 13 20 -25 20 49 -23 10 45 0.28 56 0 0 -24 51 42 6 45 13.2 5 122 63 -25 54 14 -23 49 32 -25 56 50 -23 46 57 0.28 57 0 0 -25 27 28 6 45 13.7 6 121 63 -26 29 54 -24 25 24 -26 32 30 -24 22 49 0.28 58 0 0 -26 2 52 6 45 14.4 7 121 63 -27 5 12 -25 0 54 -27 7 48 -24 58 20 0.28 59 0 0 -26 37 54 6 45 15.1 8 121 64 -27 40 7 -25 36 3 -27 42 42 -25 33 29 0.28 60 0 0 -27 12 33 6 45 16.0 9 120 64 -28 14 38 -26 10 48 -28 17 13 -26 8 15 0.28 61 0 0 -27 46 47 6 45 17.0 10 120 64 -28 48 44 -26 45 10 -28 51 19 -26 42 37 0.27 62 0 0 -28 20 36 6 45 18.0 11 119 64 -29 22 26 -27 19 7 -29 25 0 -27 16 34 0.27 63 0 0 -28 54 0 6 45 19.2 12 119 64 -29 55 41 -27 52 39 -29 58 15 -27 50 7 0.27 64 0 0 -29 26 57 6 45 20.4 13 118 64 -30 28 29 -28 25 45 -30 31 3 -28 23 13 0.27 65 0 0 -29 59 27 6 45 21.7 14 118 64 -31 0 50 -28 58 24 -31 3 23 -28 55 53 0.27 65 59 59 -30 31 30 6 45 23.2 15 117 63 -31 32 43 -29 30 36 -31 35 16 -29 28 5 0.27 66 59 59 -31 3 4 6 45 24.6 16 117 63 -32 4 8 -30 2 20 -32 6 40 -29 59 50 0.27 67 59 59 -31 34 10 6 45 26.2 17 116 63 -32 35 3 -30 33 36 -32 37 35 -30 31 6 0.27 68 59 59 -32 4 47 6 45 27.9 18 116 63 -33 5 30 -31 4 23 -33 8 1 -31 1 53 0.27 69 59 59 -32 34 54 6 45 29.6 19 115 62 -33 35 26 -31 34 41 -33 37 57 -31 32 12 0.27 70 59 59 -33 4 32 6 45 31.4 20 114 62 -34 4 53 -32 4 29 -34 7 24 -32 2 0 0.27 71 59 59 -33 33 39 6 45 33.2 21 114 62 -34 33 49 -32 33 48 -34 36 19 -32 31 19 0.27 72 59 59 -34 2 16 6 45 35.2 22 113 61 -35 2 15 -33 2 36 -35 4 44 -33 0 7 0.27 73 59 59 -34 30 22 6 45 37.2 23 113 61 -35 30 9 -33 30 53 -35 32 38 -33 28 25 0.27 74 59 59 -34 57 57 6 45 39.2 24 112 61 -35 57 33 -33 58 40 -36 0 1 -33 56 12 0.27 75 59 59 -35 25 1 6 45 41.3 25 111 60 -36 24 25 -34 25 55 -36 26 53 -34 23 28 0.27 76 59 59 -35 51 34 6 45 43.5 26 111 60 -36 50 46 -34 52 39 -36 53 13 -34 50 13 0.27 77 59 59 -36 17 35 6 45 45.7 27 110 59 -37 16 35 -35 18 52 -37 19 2 -35 16 27 0.27 78 59 59 -36 43 5 6 45 48.0 28 109 59 -37 41 53 -35 44 34 -37 44 20 -35 42 9 0.27 79 59 59 -37 8 3 6 45 50.3 29 109 58 -38 6 39 -36 9 44 -38 9 5 -36 7 19 0.27 80 59 59 -37 32 30 6 45 52.6 30 108 58 -38 30 54 -36 34 23 -38 33 19 -36 31 58 0.27 81 59 59 -37 56 25 6 45 55.0 30 107 57 -38 54 36 -36 58 30 -38 57 2 -36 56 6 0.27 82 59 59 -38 19 48 6 45 57.5 31 107 56 -39 17 48 -37 22 5 -39 20 13 -37 19 42 0.27 83 59 59 -38 42 40 6 46 0.0 32 106 56 -39 40 28 -37 45 9 -39 42 52 -37 42 46 0.27 84 59 59 -39 5 1 6 46 2.5 33 105 55 -40 2 36 -38 7 42 -40 5 0 -38 5 19 0.27 85 59 59 -39 26 50 6 46 5.1 34 104 55 -40 24 13 -38 29 42 -40 26 37 -38 27 21 0.27 86 59 59 -39 48 8 6 46 7.7 35 104 54 -40 45 19 -38 51 12 -40 47 42 -38 48 51 0.27 87 59 59 -40 8 54 6 46 10.3 36 103 54 -41 5 54 -39 12 10 -41 8 16 -39 9 50 0.27 88 59 59 -40 29 10 6 46 13.0 36 102 53 -41 25 58 -39 32 38 -41 28 20 -39 30 17 0.27 89 59 59 -40 48 55 6 46 15.6 37 101 52 -41 45 31 -39 52 34 -41 47 52 -39 50 14 0.27 90 59 59 -41 8 9 6 46 18.4 38 101 52 -42 4 33 -40 11 59 -42 6 54 -40 9 40 0.27 91 59 59 -41 26 52 6 46 21.1 39 100 51 -42 23 5 -40 30 54 -42 25 26 -40 28 35 0.27 92 59 59 -41 45 5 6 46 23.9 40 99 50 -42 41 7 -40 49 18 -42 43 27 -40 46 59 0.27 93 59 59 -42 2 48 6 46 26.7 40 98 50 -42 58 39 -41 7 12 -43 0 58 -41 4 54 0.27 94 59 59 -42 20 1 6 46 29.5 41 97 49 -43 15 41 -41 24 35 -43 18 0 -41 22 18 0.27 95 59 59 -42 36 43 6 46 32.4 42 97 49 -43 32 13 -41 41 29 -43 34 31 -41 39 11 0.27 96 59 59 -42 52 57 6 46 35.2 43 96 48 -43 48 16 -41 57 52 -43 50 34 -41 55 36 0.27 98 0 0 -43 8 41 6 46 38.1 44 95 47 -44 3 49 -42 13 46 -44 6 7 -42 11 30 0.27 99 0 0 -43 23 55 6 46 41.0 44 94 47 -44 18 54 -42 29 11 -44 21 11 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Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 296-160055 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 08 48.3426 DE: -30 57 13.031 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 08 48.3425 DE: -30 57 13.031 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (94) Aurora asteroid class: approx. diameter [km]: 186 approx. diameter ["]: 0.075 distance from Earth [AU]: 3.39960 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#120 date of fit: 2023 Aug 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): 0.005", 0.001", 89.435° remarks: * orbital elements for (94)Aurora : Mean anomaly = 234.3717389309 deg Arg. of pericenter = 60.2942372914 deg Long. of node = 2.5451410930 deg Inclination = 7.9708848188 deg Eccentricity = 0.0955160993 Semimajor axis = 3.1551966243 AU Perihelion dist = 2.8538245502 AU Mag: H = 7.75, G = 0.15 Epoch of elements : MJD 60224.28472222 TDT (2023 Oct 07.2847) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Aug25,8.64,2023,10,7,6.833122,0.049257,-0.247226,11.884487,2.379851,0.005763,-0.000049,0.000000,0.000000 154.4189,-30.9513,74.49,-5.43,False UCAC4 296-160055,18.14676186,-30.9536198,0.00,12.20,0.00,0.0,0,,18.17208837,-30.9512891,1.91,0.00,0,0,1 94,Aurora,13.90,185.600,3.3996,0,0,2.390,6.16,,10.4,0 0,234.3217,2023,10,7,60.2942,2.5451,7.9709,0.09552,3.15520,2.85382,7.72,5.0,0.15 1.021,0.0053,0.0012,89,0.0055,Known errors,-1.00,0,-1,-1 20231007_160055,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org