IOTA/IOTA-ES occultation update for (623) Chimaera / UCAC4 270-126161 event on 2024 Jul 04, 16:22 UT Visible from Summary ------- On 2024 Jul 04 UT, the 43.856209007507 km diameter asteroid (623) Chimaera will occult a 9.7 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.00 mag to 14.66 mag (the magnitude of the asteroid) for at most 3.480 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 Jul 04, 16:13 - 2024 Jul 04, 16:31 * geocentric midpoint of event [JD]: 2460496.18227446 * magnitude of target star: 9.67 * magnitude drop [mag]: 5.00 * estimated maximum duration [s]: 3.480 * Moon: 2 % sunlit, 172° distance * Sun: 161° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 82°) * approx speed of asteroid's shadow [km/s]: 12.6242 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 270-126161 by 623 Chimaera on 2024 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 25 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 22 3 29 .. .. .. 21 56 25 .... 26 0 0 21 32 39 16 30 50.9 1 130 6 21 48 16 21 17 1 21 55 22 21 9 56 .... 27 0 0 20 45 38 16 30 50.5 2 130 5 21 1 18 20 29 58 21 8 25 20 22 51 -0.01 28 0 0 19 58 2 16 30 50.0 4 131 4 20 13 45 19 42 19 20 20 53 19 35 11 -0.05 29 0 0 19 9 52 16 30 49.2 5 131 2 19 25 38 18 54 7 19 32 48 18 46 58 -0.07 30 0 0 18 21 10 16 30 48.2 6 131 1 18 36 59 18 5 23 18 44 10 17 58 13 -0.08 31 0 0 17 31 59 16 30 47.0 7 132 0 17 47 49 17 16 9 17 55 1 17 8 58 -0.09 32 0 0 16 42 19 16 30 45.4 9 132 -1 16 58 11 16 26 27 17 5 24 16 19 15 -0.09 33 0 0 15 52 12 16 30 43.7 10 132 -2 16 8 7 15 36 19 16 15 20 15 29 6 -0.10 34 0 0 15 1 42 16 30 41.6 11 132 -4 15 17 37 14 45 46 15 24 52 14 38 33 -0.10 35 0 0 14 10 48 16 30 39.4 12 133 -5 14 26 46 13 54 52 14 34 0 13 47 38 -0.10 36 0 0 13 19 35 16 30 36.8 14 133 -6 13 35 33 13 3 37 13 42 48 12 56 23 -0.10 37 0 0 12 28 3 16 30 34.0 15 133 -7 12 44 3 12 12 5 12 51 18 12 4 50 -0.11 38 0 0 11 36 16 16 30 31.0 16 133 -9 11 52 16 11 20 17 11 59 32 11 13 2 -0.11 39 0 0 10 44 15 16 30 27.7 17 134 -10 11 0 15 10 28 15 11 7 31 10 21 0 -0.11 40 0 0 9 52 3 16 30 24.1 19 134 -11 10 8 3 9 36 3 10 15 20 9 28 48 -0.11 41 0 0 8 59 42 16 30 20.3 20 134 -12 9 15 42 8 43 42 9 22 59 8 36 27 -0.11 42 0 0 8 7 14 16 30 16.2 21 134 -14 8 23 15 7 51 15 8 30 31 7 43 59 -0.11 43 0 0 7 14 43 16 30 11.8 23 134 -15 7 30 42 6 58 43 7 37 58 6 51 28 -0.11 44 0 0 6 22 9 16 30 7.3 24 134 -16 6 38 8 6 6 11 6 45 24 5 58 56 -0.11 45 0 0 5 29 36 16 30 2.4 25 134 -17 5 45 34 5 13 39 5 52 49 5 6 24 -0.11 46 0 0 4 37 6 16 29 57.4 27 135 -19 4 53 3 4 21 10 5 0 18 4 13 56 -0.11 47 0 0 3 44 41 16 29 52.1 28 135 -20 4 0 37 3 28 46 4 7 51 3 21 33 -0.11 48 0 0 2 52 24 16 29 46.5 29 135 -21 3 8 18 2 36 30 3 15 32 2 29 18 -0.11 49 0 0 2 0 17 16 29 40.8 31 135 -22 2 16 9 1 44 25 2 23 22 1 37 13 -0.11 50 0 0 1 8 21 16 29 34.8 32 135 -24 1 24 12 0 52 31 1 31 23 0 45 20 -0.11 51 0 0 0 16 40 16 29 28.7 33 135 -25 0 32 28 0 0 52 0 39 39 - 0 6 18 -0.11 52 0 0 - 0 34 45 16 29 22.3 34 135 -26 - 0 18 59 - 0 50 31 - 0 11 49 - 0 57 40 -0.11 53 0 0 - 1 25 52 16 29 15.8 36 135 -27 - 1 10 8 - 1 41 35 - 1 3 0 - 1 48 43 -0.11 54 0 0 - 2 16 39 16 29 9.0 37 135 -29 - 2 0 57 - 2 32 19 - 1 53 50 - 2 39 26 -0.11 55 0 0 - 3 7 3 16 29 2.1 38 135 -30 - 2 51 24 - 3 22 41 - 2 44 18 - 3 29 46 -0.11 56 0 0 - 3 57 3 16 28 55.0 40 135 -31 - 3 41 28 - 4 12 38 - 3 34 23 - 4 19 42 -0.11 57 0 0 - 4 46 38 16 28 47.7 41 135 -32 - 4 31 5 - 5 2 10 - 4 24 2 - 5 9 13 -0.11 58 0 0 - 5 35 45 16 28 40.3 42 135 -33 - 5 20 16 - 5 51 14 - 5 13 14 - 5 58 15 -0.11 59 0 0 - 6 24 23 16 28 32.8 43 135 -35 - 6 8 57 - 6 39 49 - 6 1 56 - 6 46 48 -0.11 60 0 0 - 7 12 31 16 28 25.1 45 135 -36 - 6 57 8 - 7 27 53 - 6 50 9 - 7 34 51 -0.11 61 0 0 - 8 0 6 16 28 17.3 46 135 -37 - 7 44 47 - 8 15 25 - 7 37 50 - 8 22 22 -0.11 62 0 0 - 8 47 9 16 28 9.4 47 135 -38 - 8 31 53 - 9 2 24 - 8 24 58 - 9 9 19 -0.11 63 0 0 - 9 33 37 16 28 1.4 48 135 -39 - 9 18 25 - 9 48 48 - 9 11 31 - 9 55 42 -0.11 64 0 0 -10 19 29 16 27 53.3 49 135 -41 -10 4 21 -10 34 37 - 9 57 29 -10 41 29 -0.11 65 0 0 -11 4 45 16 27 45.0 51 135 -42 -10 49 41 -11 19 49 -10 42 50 -11 26 39 -0.11 66 0 0 -11 49 23 16 27 36.7 52 135 -43 -11 34 22 -12 4 23 -11 27 34 -12 11 11 -0.11 67 0 0 -12 33 22 16 27 28.4 53 135 -44 -12 18 26 -12 48 18 -12 11 39 -12 55 5 -0.11 68 0 0 -13 16 42 16 27 19.9 54 135 -45 -13 1 50 -13 31 34 -12 55 5 -13 38 19 -0.11 69 0 0 -13 59 22 16 27 11.4 55 135 -46 -13 44 34 -14 14 10 -13 37 50 -14 20 53 -0.11 70 0 0 -14 41 21 16 27 2.9 56 135 -47 -14 26 37 -14 56 5 -14 19 55 -15 2 46 -0.11 71 0 0 -15 22 39 16 26 54.3 58 135 -48 -15 7 58 -15 37 18 -15 1 19 -15 43 57 -0.11 72 0 0 -16 3 14 16 26 45.6 59 135 -49 -15 48 38 -16 17 50 -15 42 0 -16 24 27 -0.11 73 0 0 -16 43 7 16 26 37.0 60 135 -51 -16 28 35 -16 57 39 -16 21 59 -17 4 14 -0.11 74 0 0 -17 22 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24 -35 46 22 -0.10 146 0 0 -35 23 19 16 17 35.5 54 255 -62 -35 11 17 -35 35 21 -35 5 49 -35 40 49 -0.10 147 0 0 -35 17 12 16 17 29.7 53 255 -61 -35 5 8 -35 29 15 -34 59 40 -35 34 43 -0.10 148 0 0 -35 10 31 16 17 24.0 52 254 -60 -34 58 26 -35 22 35 -34 52 58 -35 28 4 -0.10 149 0 0 -35 3 16 16 17 18.4 51 254 -59 -34 51 11 -35 15 22 -34 45 41 -35 20 51 -0.10 150 0 0 -34 55 28 16 17 12.8 51 253 -59 -34 43 21 -35 7 34 -34 37 51 -35 13 4 -0.10 151 0 0 -34 47 5 16 17 7.3 50 253 -58 -34 34 57 -34 59 13 -34 29 26 -35 4 44 -0.10 152 0 0 -34 38 8 16 17 1.7 49 253 -57 -34 25 58 -34 50 18 -34 20 27 -34 55 49 -0.10 153 0 0 -34 28 37 16 16 56.3 48 252 -56 -34 16 25 -34 40 48 -34 10 53 -34 46 19 -0.11 154 0 0 -34 18 30 16 16 50.9 47 252 -56 -34 6 17 -34 30 43 -34 0 45 -34 36 16 -0.11 155 0 0 -34 7 49 16 16 45.5 47 251 -55 -33 55 34 -34 20 3 -33 50 1 -34 25 37 -0.11 156 0 0 -33 56 32 16 16 40.2 46 251 -54 -33 44 15 -34 8 48 -33 38 41 -34 14 22 -0.11 157 0 0 -33 44 39 16 16 34.9 45 250 -53 -33 32 21 -33 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50 -30 46 28 -30 15 1 -30 52 17 -0.11 170 0 0 -30 13 30 16 15 31.2 34 244 -43 -30 0 38 -30 26 22 -29 54 48 -30 32 12 -0.11 171 0 0 -29 52 40 16 15 26.7 33 244 -42 -29 39 45 -30 5 35 -29 33 53 -30 11 27 -0.11 172 0 0 -29 31 9 16 15 22.4 32 243 -41 -29 18 10 -29 44 7 -29 12 17 -29 50 0 -0.11 173 0 0 -29 8 56 16 15 18.1 31 243 -40 -28 55 54 -29 21 57 -28 49 59 -29 27 52 -0.11 174 0 0 -28 46 0 16 15 13.8 30 243 -39 -28 32 55 -28 59 5 -28 26 58 -29 5 1 -0.11 175 0 0 -28 22 22 16 15 9.7 29 242 -38 -28 9 13 -28 35 30 -28 3 15 -28 41 28 -0.11 176 0 0 -27 58 0 16 15 5.6 28 242 -37 -27 44 48 -28 11 13 -27 38 48 -28 17 12 -0.11 177 0 0 -27 32 55 16 15 1.7 27 241 -36 -27 19 39 -27 46 11 -27 13 38 -27 52 12 -0.11 178 0 0 -27 7 6 16 14 57.8 26 241 -35 -26 53 46 -27 20 26 -26 47 43 -27 26 29 -0.11 179 0 0 -26 40 33 16 14 54.1 25 240 -34 -26 27 9 -26 53 56 -26 21 4 -27 0 1 -0.11 180 0 0 -26 13 14 16 14 50.4 24 240 -33 -25 59 46 -26 26 42 -25 53 40 -26 32 48 -0.11 -179 0 0 -25 45 11 16 14 46.8 23 240 -33 -25 31 39 -25 58 42 -25 25 30 -26 4 50 -0.11 -178 0 0 -25 16 22 16 14 43.4 22 239 -32 -25 2 45 -25 29 57 -24 56 35 -25 36 7 -0.11 -177 0 0 -24 46 46 16 14 40.0 21 239 -31 -24 33 6 -25 0 26 -24 26 54 -25 6 38 -0.11 -176 0 0 -24 16 25 16 14 36.8 20 238 -30 -24 2 40 -24 30 9 -23 56 26 -24 36 22 -0.11 -175 0 0 -23 45 16 16 14 33.8 19 238 -29 -23 31 27 -23 59 5 -23 25 11 -24 5 20 -0.11 -174 0 0 -23 13 21 16 14 30.8 18 238 -28 -22 59 28 -23 27 14 -22 53 10 -23 33 31 -0.11 -173 0 0 -22 40 38 16 14 28.0 17 237 -27 -22 26 41 -22 54 35 -22 20 21 -23 0 55 -0.11 -172 0 0 -22 7 8 16 14 25.3 16 237 -26 -21 53 6 -22 21 10 -21 46 44 -22 27 32 -0.11 -171 0 0 -21 32 51 16 14 22.8 15 236 -24 -21 18 44 -21 46 57 -21 12 20 -21 53 20 -0.11 -170 0 0 -20 57 45 16 14 20.4 14 236 -23 -20 43 34 -21 11 56 -20 37 8 -21 18 21 -0.11 -169 0 0 -20 21 51 16 14 18.2 13 236 -22 -20 7 36 -20 36 7 -20 1 7 -20 42 35 -0.11 -168 0 0 -19 45 10 16 14 16.1 11 235 -21 -19 30 49 -19 59 30 -19 24 19 -20 6 0 -0.11 -167 0 0 -19 7 40 16 14 14.2 10 235 -20 -18 53 15 -19 22 4 -18 46 42 -19 28 37 -0.11 -166 0 0 -18 29 22 16 14 12.5 9 235 -19 -18 14 52 -18 43 51 -18 8 18 -18 50 26 -0.11 -165 0 0 -17 50 16 16 14 11.0 8 235 -18 -17 35 42 -18 4 50 -17 29 5 -18 11 27 -0.11 -164 0 0 -17 10 23 16 14 9.6 7 234 -17 -16 55 43 -17 25 1 -16 49 4 -17 31 40 -0.11 -163 0 0 -16 29 41 16 14 8.5 6 234 -16 -16 14 57 -16 44 25 -16 8 16 -16 51 5 -0.10 -162 0 0 -15 48 13 16 14 7.6 5 234 -15 -15 33 24 -16 3 1 -15 26 41 -16 9 43 -0.10 -161 0 0 -15 5 57 16 14 6.8 3 233 -14 -14 51 4 -15 20 50 -14 44 18 -15 27 35 -0.09 -160 0 0 -14 22 55 16 14 6.3 2 233 -12 -14 7 57 -14 37 52 -14 1 9 -14 44 39 -0.08 -159 0 0 -13 39 7 16 14 6.0 1 233 -11 -13 24 4 -13 54 9 -13 17 14 -14 0 58 -0.01 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 270-126161 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 53 09.4617 DE: -36 09 00.829 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 53 09.4617 DE: -36 09 00.830 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.7 * B mag [mag]: 10.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (623) Chimaera asteroid class: approx. diameter [km]: 44 approx. diameter ["]: 0.035 distance from Earth [AU]: 1.73440 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#93 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): 0.015", 0.003", 82.474° remarks: * orbital elements for (623)Chimaera : Mean anomaly = 204.6288934207 deg Arg. of pericenter = 124.9129788596 deg Long. of node = 308.2801216582 deg Inclination = 14.1239993244 deg Eccentricity = 0.1114925221 Semimajor axis = 2.4618408175 AU Perihelion dist = 2.1873639756 AU Mag: H = 10.79, G = 0.15 Epoch of elements : MJD 60495.68227479 TDT (2024 Jul 04.6823) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Apr24,3.48,2024,7,4,16.374587,0.037792,0.093576,-6.607016,2.668233,0.001369,0.001171,0.000001,0.000000 99.9209,-36.1565,-64.47,22.79,False UCAC4 270-126161,17.88596160,-36.1502303,10.50,9.67,9.22,0.1,0,,17.91392431,-36.1564678,5.00,5.00,0,0,0 623,Chimaera,14.66,43.982,1.7344,0,0,-2.764,13.53,,2.8,0 0,204.4548,2024,7,4,124.9130,308.2801,14.1240,0.11149,2.46184,2.18736,10.78,5.0,0.15 1.227,0.0150,0.0033,82,0.0079,Known errors,0.70,0,-1,-1 20240704_126161,60140.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org