IOTA/IOTA-ES occultation update for (952) Caia / UCAC4 317-232796 event on 2024 Oct 21, 00:33 UT Visible from Summary ------- On 2024 Oct 21 UT, the 88.266 km diameter asteroid (952) Caia will occult a 11.8 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 2.33 mag to 13.94 mag (the magnitude of the asteroid) for at most 6.130 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 Oct 21, 00:25 - 2024 Oct 21, 00:40 * geocentric midpoint of event [JD]: 2460604.52307880 * magnitude of target star: 11.75 * magnitude drop [mag]: 2.33 * estimated maximum duration [s]: 6.130 * Moon: 82 % sunlit, 130° distance * Sun: 99° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 92 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 71°) * approx speed of asteroid's shadow [km/s]: 14.4050 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 317-232796 by 952 Caia on 2024 Oct 21 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 176 0 0 -19 47 52 0 26 10.2 0 118 79 -20 16 4 -19 19 35 -20 22 15 .. .. .. .... 177 0 0 -20 18 1 0 26 10.3 1 118 78 -20 46 4 -19 49 55 -20 52 12 -19 43 44 -0.06 178 0 0 -20 47 16 0 26 10.6 2 118 77 -21 15 9 -20 19 19 -21 21 15 -20 13 11 -0.17 179 0 0 -21 15 36 0 26 11.0 3 117 76 -21 43 19 -20 47 49 -21 49 23 -20 41 43 -0.20 -180 0 0 -21 43 3 0 26 11.6 4 117 75 -22 10 37 -21 15 25 -22 16 39 -21 9 21 -0.23 -179 0 0 -22 9 36 0 26 12.3 5 117 74 -22 37 1 -21 42 7 -22 43 1 -21 36 5 -0.24 -178 0 0 -22 35 16 0 26 13.2 6 116 73 -23 2 32 -22 7 56 -23 8 30 -22 1 56 -0.25 -177 0 0 -23 0 4 0 26 14.2 7 116 72 -23 27 11 -22 32 53 -23 33 7 -22 26 54 -0.25 -176 0 0 -23 24 0 0 26 15.3 8 115 71 -23 50 59 -22 56 57 -23 56 53 -22 51 0 -0.26 -175 0 0 -23 47 4 0 26 16.6 9 115 70 -24 13 55 -23 20 9 -24 19 48 -23 14 15 -0.26 -174 0 0 -24 9 18 0 26 18.0 10 115 69 -24 36 1 -23 42 31 -24 41 52 -23 36 38 -0.27 -173 0 0 -24 30 41 0 26 19.5 11 114 69 -24 57 17 -24 4 1 -25 3 6 -23 58 10 -0.27 -172 0 0 -24 51 14 0 26 21.1 12 114 68 -25 17 43 -24 24 42 -25 23 31 -24 18 53 -0.27 -171 0 0 -25 10 58 0 26 22.9 13 113 67 -25 37 20 -24 44 33 -25 43 6 -24 38 45 -0.27 -170 0 0 -25 29 53 0 26 24.8 14 113 66 -25 56 8 -25 3 35 -26 1 53 -24 57 48 -0.28 -169 0 0 -25 48 0 0 26 26.8 15 113 65 -26 14 8 -25 21 48 -26 19 51 -25 16 3 -0.28 -168 0 0 -26 5 18 0 26 28.9 16 112 64 -26 31 20 -25 39 13 -26 37 2 -25 33 29 -0.28 -167 0 0 -26 21 49 0 26 31.1 17 112 63 -26 47 45 -25 55 49 -26 53 26 -25 50 7 -0.28 -166 0 0 -26 37 33 0 26 33.4 18 111 62 -27 3 23 -26 11 39 -27 9 3 -26 5 58 -0.28 -165 0 0 -26 52 30 0 26 35.8 19 111 61 -27 18 15 -26 26 41 -27 23 53 -26 21 1 -0.28 -164 0 0 -27 6 41 0 26 38.3 20 111 60 -27 32 21 -26 40 57 -27 37 58 -26 35 18 -0.28 -163 0 0 -27 20 5 0 26 40.9 21 110 59 -27 45 41 -26 54 27 -27 51 17 -26 48 49 -0.28 -162 0 0 -27 32 45 0 26 43.7 22 110 58 -27 58 15 -27 7 10 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29 50 41 31 22 22 -0.28 - 51 0 0 31 34 58 0 39 42.9 22 215 -50 30 57 35 32 12 32 30 49 24 32 20 47 -0.28 - 50 0 0 32 32 35 0 39 46.7 21 216 -50 31 55 20 33 10 0 31 47 11 33 18 13 -0.28 - 49 0 0 33 29 12 0 39 50.2 20 216 -51 32 52 5 34 6 28 32 43 59 34 14 39 -0.28 - 48 0 0 34 24 47 0 39 53.5 19 217 -51 33 47 51 35 1 54 33 39 46 35 10 3 -0.28 - 47 0 0 35 19 20 0 39 56.6 17 217 -51 34 42 34 35 56 17 34 34 31 36 4 24 -0.28 - 46 0 0 36 12 49 0 39 59.4 16 218 -51 35 36 14 36 49 35 35 28 13 36 57 39 -0.28 - 45 0 0 37 5 13 0 40 1.9 15 219 -52 36 28 49 37 41 47 36 20 51 37 49 49 -0.28 - 44 0 0 37 56 31 0 40 4.2 14 219 -52 37 20 18 38 32 53 37 12 23 38 40 52 -0.28 - 43 0 0 38 46 42 0 40 6.3 13 220 -52 38 10 41 39 22 51 38 2 49 39 30 48 -0.28 - 42 0 0 39 35 46 0 40 8.2 11 221 -52 38 59 58 40 11 42 38 52 8 40 19 36 -0.28 - 41 0 0 40 23 42 0 40 9.9 10 221 -52 39 48 8 40 59 26 39 40 21 41 7 17 -0.28 - 40 0 0 41 10 31 0 40 11.4 9 222 -52 40 35 10 41 46 1 40 27 26 41 53 49 -0.28 - 39 0 0 41 56 13 0 40 12.7 8 223 -52 41 21 5 42 31 29 41 13 24 42 39 14 -0.28 - 38 0 0 42 40 47 0 40 13.8 7 223 -52 42 5 53 43 15 49 41 58 15 43 23 31 -0.28 - 37 0 0 43 24 14 0 40 14.7 6 224 -52 42 49 35 43 59 2 42 42 0 44 6 41 -0.28 - 36 0 0 44 6 35 0 40 15.5 5 225 -52 43 32 10 44 41 8 43 24 38 44 48 44 -0.28 - 35 0 0 44 47 50 0 40 16.1 4 225 -52 44 13 40 45 22 9 44 6 11 45 29 41 -0.27 - 34 0 0 45 28 0 0 40 16.6 3 226 -51 44 54 4 46 2 4 44 46 39 46 9 33 -0.27 - 33 0 0 46 7 6 0 40 17.0 2 227 -51 45 33 24 46 40 55 45 26 2 46 48 21 -0.27 - 32 0 0 46 45 7 0 40 17.2 1 227 -51 46 11 41 47 18 42 46 4 22 47 26 4 -0.25 - 31 0 0 47 22 6 0 40 17.3 0 228 -51 46 48 54 .. .. .. 46 41 39 .. .. .. -0.16 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 317-232796 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 48 51.4209 DE: -26 47 20.895 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 48 51.4209 DE: -26 47 20.895 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (952) Caia asteroid class: approx. diameter [km]: 88 approx. diameter ["]: 0.060 distance from Earth [AU]: 2.01570 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): 0.019", 0.001", 71.337° remarks: * orbital elements for (952)Caia : Mean anomaly = 333.1788941131 deg Arg. of pericenter = 356.8027779651 deg Long. of node = 18.3850602137 deg Inclination = 9.9921153793 deg Eccentricity = 0.2441918807 Semimajor axis = 2.9900627946 AU Perihelion dist = 2.2599137374 AU Mag: H = 9.40, G = 0.15 Epoch of elements : MJD 60604.02307880 TDT (2024 Oct 21.0231) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#632023Apr24,6.13,2024,10,21,0.553891,-0.180200,0.224263,6.341370,5.088530,0.005287,0.001643,0.000000,0.000000 -85.6787,-26.6987,167.85,-10.80,False UCAC4 317-232796,20.81428362,-26.7891374,12.46,11.75,11.37,0.0,0,,20.83897715,-26.6987238,2.32,2.26,0,0,0 952,Caia,13.94,88.266,2.0157,0,0,2.066,22.21,,4.4,0 0,332.9839,2024,10,20,356.8028,18.3851,9.9921,0.24419,2.99006,2.25991,9.39,5.0,0.15 1.110,0.0190,0.0012,71,0.0066,Known errors,1.11,0,-1,-1 20241021_232796,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org