IOTA/IOTA-ES occultation update for (952) Caia / UCAC4 347-189140 event on 2024 Nov 26, 10:50 UT Visible from Summary ------- On 2024 Nov 26 UT, the 88.255 km diameter asteroid (952) Caia will occult a 11.7 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.69 mag to 14.26 mag (the magnitude of the asteroid) for at most 3.210 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: 2024 Nov 26, 10:46 - 2024 Nov 26, 10:54 * geocentric midpoint of event [JD]: 2460640.95169325 * magnitude of target star: 11.66 * magnitude drop [mag]: 2.69 * estimated maximum duration [s]: 3.210 * Moon: 20 % sunlit, 127° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.001", 65°) * approx speed of asteroid's shadow [km/s]: 27.5166 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 347-189140 by 952 Caia on 2024 Nov 26 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 - 9 0 0 -35 38 52 10 46 37.5 1 115 64 -36 5 37 -35 12 10 -36 7 19 -35 10 29 .... - 8 0 0 -36 1 38 10 46 37.6 2 114 65 -36 28 16 -35 35 2 -36 29 58 -35 33 20 0.20 - 7 0 0 -36 23 50 10 46 37.8 2 114 65 -36 50 22 -35 57 19 -36 52 3 -35 55 38 0.18 - 6 0 0 -36 45 27 10 46 37.9 3 113 66 -37 11 54 -36 19 3 -37 13 35 -36 17 22 0.18 - 5 0 0 -37 6 32 10 46 38.2 4 113 66 -37 32 53 -36 40 13 -37 34 33 -36 38 32 0.17 - 4 0 0 -37 27 2 10 46 38.5 5 112 67 -37 53 18 -37 0 49 -37 54 58 -36 59 9 0.17 - 3 0 0 -37 47 0 10 46 38.8 6 111 67 -38 13 10 -37 20 52 -38 14 50 -37 19 12 0.17 - 2 0 0 -38 6 24 10 46 39.2 7 111 67 -38 32 29 -37 40 22 -38 34 8 -37 38 43 0.17 - 1 0 0 -38 25 16 10 46 39.7 8 110 68 -38 51 15 -37 59 19 -38 52 54 -37 57 40 0.17 0 0 0 -38 43 35 10 46 40.2 9 110 68 -39 9 29 -38 17 43 -39 11 7 -38 16 4 0.16 1 0 0 -39 1 21 10 46 40.7 9 109 68 -39 27 10 -38 35 35 -39 28 49 -38 33 57 0.16 2 0 0 -39 18 36 10 46 41.3 10 108 69 -39 44 19 -38 52 54 -39 45 57 -38 51 16 0.16 3 0 0 -39 35 18 10 46 41.9 11 108 69 -40 0 57 -39 9 42 -40 2 35 -39 8 4 0.16 4 0 0 -39 51 29 10 46 42.6 12 107 69 -40 17 2 -39 25 57 -40 18 40 -39 24 20 0.16 5 0 0 -40 7 8 10 46 43.3 13 106 69 -40 32 37 -39 41 41 -40 34 14 -39 40 4 0.16 6 0 0 -40 22 16 10 46 44.0 13 106 69 -40 47 40 -39 56 54 -40 49 17 -39 55 17 0.16 7 0 0 -40 36 53 10 46 44.8 14 105 69 -41 2 12 -40 11 35 -41 3 49 -40 9 59 0.16 8 0 0 -40 50 59 10 46 45.6 15 104 69 -41 16 14 -40 25 45 -41 17 50 -40 24 9 0.16 9 0 0 -41 4 34 10 46 46.5 16 104 69 -41 29 45 -40 39 25 -41 31 21 -40 37 49 0.16 10 0 0 -41 17 39 10 46 47.4 17 103 69 -41 42 46 -40 52 34 -41 44 22 -40 50 59 0.16 11 0 0 -41 30 14 10 46 48.3 17 102 69 -41 55 17 -41 5 13 -41 56 53 -41 3 38 0.16 12 0 0 -41 42 19 10 46 49.3 18 102 69 -42 7 18 -41 17 22 -42 8 53 -41 15 47 0.16 13 0 0 -41 53 55 10 46 50.3 19 101 69 -42 18 50 -41 29 2 -42 20 25 -41 27 27 0.16 14 0 0 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23 -11 14 18 -12 16 17 -11 12 24 0.16 126 0 0 -11 0 58 10 52 24.3 58 248 -16 -11 31 2 -10 30 57 -11 32 57 -10 29 3 0.16 127 0 0 -10 17 31 10 52 28.5 57 248 -17 -10 47 35 - 9 47 30 -10 49 30 - 9 45 36 0.16 128 0 0 - 9 34 0 10 52 32.7 56 247 -19 -10 4 3 - 9 3 59 -10 5 58 - 9 2 5 0.16 129 0 0 - 8 50 25 10 52 36.9 54 247 -20 - 9 20 28 - 8 20 25 - 9 22 23 - 8 18 31 0.16 130 0 0 - 8 6 49 10 52 41.0 53 246 -21 - 8 36 51 - 7 36 51 - 8 38 46 - 7 34 56 0.16 131 0 0 - 7 23 14 10 52 45.0 52 246 -22 - 7 53 15 - 6 53 17 - 7 55 9 - 6 51 23 0.16 132 0 0 - 6 39 41 10 52 48.9 51 245 -23 - 7 9 40 - 6 9 45 - 7 11 35 - 6 7 51 0.16 133 0 0 - 5 56 12 10 52 52.8 49 245 -25 - 6 26 9 - 5 26 18 - 6 28 3 - 5 24 24 0.16 134 0 0 - 5 12 49 10 52 56.7 48 245 -26 - 5 42 43 - 4 42 57 - 5 44 37 - 4 41 3 0.16 135 0 0 - 4 29 32 10 53 0.4 47 244 -27 - 4 59 25 - 3 59 43 - 5 1 19 - 3 57 49 0.16 136 0 0 - 3 46 25 10 53 4.1 46 244 -28 - 4 16 14 - 3 16 39 - 4 18 8 - 3 14 45 0.17 137 0 0 - 3 3 28 10 53 7.7 45 244 -30 - 3 33 15 - 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16 19 5 16 59 6 18 8 0.17 151 0 0 6 25 36 10 53 48.6 28 243 -46 5 56 56 6 54 14 5 55 6 6 56 3 0.17 152 0 0 7 3 7 10 53 50.8 27 243 -48 6 34 32 7 31 39 6 32 43 7 33 27 0.17 153 0 0 7 40 7 10 53 52.9 25 243 -49 7 11 39 8 8 33 7 9 50 8 10 22 0.17 154 0 0 8 16 37 10 53 54.9 24 243 -50 7 48 14 8 44 56 7 46 26 8 46 44 0.17 155 0 0 8 52 34 10 53 56.8 23 243 -51 8 24 17 9 20 47 8 22 29 9 22 35 0.17 156 0 0 9 27 58 10 53 58.6 22 243 -52 8 59 48 9 56 6 8 58 1 9 57 53 0.17 157 0 0 10 2 49 10 54 0.3 21 243 -53 9 34 45 10 30 51 9 32 58 10 32 37 0.17 158 0 0 10 37 7 10 54 1.9 20 243 -54 10 9 9 11 5 1 10 7 22 11 6 48 0.17 159 0 0 11 10 49 10 54 3.4 18 244 -56 10 42 58 11 38 38 10 41 12 11 40 24 0.17 160 0 0 11 43 57 10 54 4.8 17 244 -57 11 16 12 12 11 40 11 14 26 12 13 25 0.18 161 0 0 12 16 30 10 54 6.1 16 244 -58 11 48 51 12 44 6 11 47 6 12 45 51 0.18 162 0 0 12 48 27 10 54 7.4 15 244 -59 12 20 55 13 15 57 12 19 10 13 17 41 0.18 163 0 0 13 19 48 10 54 8.5 14 244 -60 12 52 22 13 47 11 12 50 37 13 48 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31 19 39 3 1.22 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 347-189140 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 31 04.5569 DE: -20 43 42.311 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 31 04.5568 DE: -20 43 42.311 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.7 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (952) Caia asteroid class: approx. diameter [km]: 88 approx. diameter ["]: 0.051 distance from Earth [AU]: 2.40070 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#63 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): 0.016", 0.001", 65.392° remarks: * orbital elements for (952)Caia : Mean anomaly = 340.1183249314 deg Arg. of pericenter = 356.8098840735 deg Long. of node = 18.3846781842 deg Inclination = 9.9921903364 deg Eccentricity = 0.2441794229 Semimajor axis = 2.9899742565 AU Perihelion dist = 2.2598840681 AU Mag: H = 9.40, G = 0.15 Epoch of elements : MJD 60640.45169296 TDT (2024 Nov 26.4517) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#632023Apr24,3.21,2024,11,26,10.840638,0.073844,-0.132605,13.552096,7.586660,0.005284,0.001620,0.000000,0.000000 94.6478,-20.6205,14.25,-21.07,False UCAC4 347-189140,21.51793250,-20.7284195,12.13,11.66,11.41,0.0,0,,21.54121669,-20.6204900,2.69,2.51,0,0,0 952,Caia,14.26,88.255,2.4007,0,0,3.536,27.80,,4.4,0 0,340.0322,2024,11,26,356.8099,18.3847,9.9922,0.24418,2.98997,2.25988,9.39,5.0,0.15 1.032,0.0163,0.0009,65,0.0016,Known errors,0.98,0,-1,-1 20241126_189140,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org