IOTA/IOTA-ES occultation update for (623) Chimaera / UCAC4 330-184065 event on 2024 Nov 14, 10:08 UT Visible from Summary ------- On 2024 Nov 14 UT, the 43.7263174404171 km diameter asteroid (623) Chimaera will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.89 mag to 16.25 mag (the magnitude of the asteroid) for at most 1.260 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 14, 10:06 - 2024 Nov 14, 10:11 * geocentric midpoint of event [JD]: 2460628.92281495 * magnitude of target star: 11.37 * magnitude drop [mag]: 4.89 * estimated maximum duration [s]: 1.260 * Moon: 97 % sunlit, 107° distance * Sun: 52° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.001", 68°) * approx speed of asteroid's shadow [km/s]: 34.9905 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 330-184065 by 623 Chimaera on 2024 Nov 14 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 - 43 0 0 -51 47 0 10 6 41.9 0 130 28 -52 9 14 -51 24 57 -52 12 52 -51 21 23 .... - 42 0 0 -52 18 57 10 6 42.0 1 130 29 -52 41 12 -51 56 54 -52 44 50 -51 53 20 0.86 - 41 0 0 -52 50 33 10 6 42.1 2 129 29 -53 12 47 -52 28 29 -53 16 25 -52 24 55 0.92 - 40 0 0 -53 21 46 10 6 42.2 3 128 30 -53 44 0 -52 59 42 -53 47 38 -52 56 8 0.94 - 39 0 0 -53 52 34 10 6 42.4 3 127 30 -54 14 48 -53 30 32 -54 18 26 -53 26 58 0.95 - 38 0 0 -54 22 59 10 6 42.7 4 126 31 -54 45 12 -54 0 57 -54 48 50 -53 57 24 0.96 - 37 0 0 -54 52 59 10 6 43.0 5 126 31 -55 15 11 -54 30 58 -55 18 48 -54 27 25 0.97 - 36 0 0 -55 22 33 10 6 43.3 6 125 32 -55 44 43 -55 0 34 -55 48 20 -54 57 0 0.97 - 35 0 0 -55 51 40 10 6 43.7 7 124 32 -56 13 49 -55 29 43 -56 17 26 -55 26 10 0.98 - 34 0 0 -56 20 21 10 6 44.1 7 123 33 -56 42 27 -55 58 25 -56 46 3 -55 54 52 0.98 - 33 0 0 -56 48 33 10 6 44.5 8 122 33 -57 10 37 -56 26 40 -57 14 13 -56 23 8 0.98 - 32 0 0 -57 16 18 10 6 45.0 9 121 33 -57 38 19 -56 54 27 -57 41 55 -56 50 55 0.98 - 31 0 0 -57 43 34 10 6 45.5 9 120 34 -58 5 32 -57 21 46 -58 9 8 -57 18 15 0.98 - 30 0 0 -58 10 21 10 6 46.0 10 120 34 -58 32 16 -57 48 37 -58 35 51 -57 45 6 0.99 - 29 0 0 -58 36 40 10 6 46.6 11 119 34 -58 58 31 -58 14 58 -59 2 5 -58 11 28 0.99 - 28 0 0 -59 2 28 10 6 47.1 11 118 35 -59 24 16 -58 40 51 -59 27 50 -58 37 21 0.99 - 27 0 0 -59 27 48 10 6 47.8 12 117 35 -59 49 32 -59 6 14 -59 53 5 -59 2 45 0.99 - 26 0 0 -59 52 38 10 6 48.4 13 116 35 -60 14 17 -59 31 8 -60 17 50 -59 27 39 0.99 - 25 0 0 -60 16 57 10 6 49.0 13 115 35 -60 38 33 -59 55 32 -60 42 4 -59 52 4 0.99 - 24 0 0 -60 40 47 10 6 49.7 14 114 36 -61 2 18 -60 19 26 -61 5 49 -60 15 59 0.99 - 23 0 0 -61 4 7 10 6 50.4 15 113 36 -61 25 33 -60 42 51 -61 29 3 -60 39 24 0.99 - 22 0 0 -61 26 57 10 6 51.1 15 112 36 -61 48 18 -61 5 46 -61 51 47 -61 2 20 0.99 - 21 0 0 -61 49 17 10 6 51.8 16 111 36 -62 10 34 -61 28 11 -62 14 2 -61 24 46 0.99 - 20 0 0 -62 11 8 10 6 52.6 16 111 37 -62 32 19 -61 50 7 -62 35 47 -61 46 43 0.99 - 19 0 0 -62 32 30 10 6 53.3 17 110 37 -62 53 35 -62 11 33 -62 57 2 -62 8 10 0.99 - 18 0 0 -62 53 22 10 6 54.1 17 109 37 -63 14 22 -62 32 31 -63 17 47 -62 29 8 0.99 - 17 0 0 -63 13 44 10 6 54.9 18 108 37 -63 34 39 -62 52 59 -63 38 4 -62 49 38 0.99 - 16 0 0 -63 33 38 10 6 55.7 18 107 37 -63 54 27 -63 12 59 -63 57 51 -63 9 38 0.99 - 15 0 0 -63 53 4 10 6 56.5 19 106 37 -64 13 47 -63 32 30 -64 17 10 -63 29 10 0.99 - 14 0 0 -64 12 1 10 6 57.3 19 105 37 -64 32 38 -63 51 33 -64 36 0 -63 48 14 0.99 - 13 0 0 -64 30 30 10 6 58.1 20 104 38 -64 51 1 -64 10 8 -64 54 22 -64 6 50 0.99 - 12 0 0 -64 48 32 10 6 58.9 20 103 38 -65 8 57 -64 28 15 -65 12 17 -64 24 58 0.99 - 11 0 0 -65 6 6 10 6 59.7 21 102 38 -65 26 25 -64 45 55 -65 29 44 -64 42 39 0.99 - 10 0 0 -65 23 13 10 7 0.6 21 101 38 -65 43 26 -65 3 8 -65 46 44 -64 59 53 0.99 - 9 0 0 -65 39 53 10 7 1.4 22 100 38 -66 0 1 -65 19 54 -66 3 18 -65 16 40 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33 -69 1 13 -68 17 31 0.99 5 0 0 -68 50 27 10 7 13.2 27 86 38 -69 9 12 -68 31 48 -69 12 16 -68 28 47 0.99 6 0 0 -69 1 16 10 7 14.0 28 85 38 -69 19 56 -68 42 42 -69 22 58 -68 39 42 0.99 7 0 0 -69 11 44 10 7 14.9 28 84 38 -69 30 19 -68 53 16 -69 33 21 -68 50 16 0.99 8 0 0 -69 21 53 10 7 15.7 28 83 38 -69 40 22 -69 3 30 -69 43 23 -69 0 31 0.99 9 0 0 -69 31 42 10 7 16.6 29 81 38 -69 50 6 -69 13 23 -69 53 6 -69 10 25 0.99 10 0 0 -69 41 11 10 7 17.4 29 80 38 -69 59 31 -69 22 58 -70 2 30 -69 20 1 0.99 11 0 0 -69 50 22 10 7 18.2 29 79 38 -70 8 37 -69 32 14 -70 11 35 -69 29 17 0.99 12 0 0 -69 59 14 10 7 19.1 30 78 38 -70 17 24 -69 41 11 -70 20 22 -69 38 15 0.99 13 0 0 -70 7 49 10 7 19.9 30 77 38 -70 25 54 -69 49 49 -70 28 51 -69 46 54 0.99 14 0 0 -70 16 5 10 7 20.7 30 76 38 -70 34 6 -69 58 10 -70 37 2 -69 55 16 0.99 15 0 0 -70 24 3 10 7 21.6 31 75 38 -70 42 0 -70 6 13 -70 44 55 -70 3 19 0.99 16 0 0 -70 31 45 10 7 22.4 31 74 38 -70 49 37 -70 13 58 -70 52 32 -70 11 6 0.99 17 0 0 -70 39 9 10 7 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-36 50 51 -36 9 43 -36 54 14 -36 6 24 1.04 167 0 0 -35 56 7 10 10 51.3 16 251 -26 -36 16 39 -35 35 43 -36 20 1 -35 32 25 1.04 168 0 0 -35 22 16 10 10 52.5 15 251 -27 -35 42 43 -35 1 58 -35 46 3 -34 58 41 1.04 169 0 0 -34 48 43 10 10 53.6 14 250 -28 -35 9 3 -34 28 31 -35 12 23 -34 25 14 1.05 170 0 0 -34 15 27 10 10 54.6 13 250 -29 -34 35 42 -33 55 21 -34 39 0 -33 52 6 1.05 171 0 0 -33 42 31 10 10 55.6 12 249 -30 -34 2 40 -33 22 31 -34 5 57 -33 19 16 1.06 172 0 0 -33 9 55 10 10 56.5 11 248 -30 -33 29 58 -32 50 1 -33 33 14 -32 46 47 1.06 173 0 0 -32 37 41 10 10 57.3 10 248 -31 -32 57 38 -32 17 53 -33 0 53 -32 14 40 1.07 174 0 0 -32 5 49 10 10 58.0 9 247 -32 -32 25 40 -31 46 7 -32 28 54 -31 42 55 1.08 175 0 0 -31 34 21 10 10 58.6 8 247 -33 -31 54 5 -31 14 44 -31 57 19 -31 11 34 1.09 176 0 0 -31 3 17 10 10 59.2 7 246 -34 -31 22 56 -30 43 46 -31 26 8 -30 40 36 1.10 177 0 0 -30 32 38 10 10 59.7 6 246 -35 -30 52 11 -30 13 13 -30 55 22 -30 10 5 1.12 178 0 0 -30 2 26 10 11 0.2 5 245 -36 -30 21 53 -29 43 7 -30 25 3 -29 39 59 1.14 179 0 0 -29 32 41 10 11 0.5 4 245 -37 -29 52 2 -29 13 27 -29 55 11 -29 10 20 1.18 180 0 0 -29 3 23 10 11 0.8 3 244 -38 -29 22 38 -28 44 15 -29 25 47 -28 41 9 1.24 -179 0 0 -28 34 34 10 11 1.0 2 244 -38 -28 53 44 -28 15 32 -28 56 51 -28 12 27 1.38 -178 0 0 -28 6 15 10 11 1.1 1 243 -39 -28 25 19 -27 47 18 -28 28 25 -27 44 14 1.81 -177 0 0 .. .. .... .. .. .. .. .. .. -27 57 24 .. .. .. -28 0 30 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 330-184065 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 03 23.1264 DE: -24 01 17.179 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 03 23.1264 DE: -24 01 17.179 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * B mag [mag]: 12.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (623) Chimaera asteroid class: approx. diameter [km]: 44 approx. diameter ["]: 0.019 distance from Earth [AU]: 3.11170 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): 0.009", 0.001", 68.339° remarks: * orbital elements for (623)Chimaera : Mean anomaly = 238.4547138376 deg Arg. of pericenter = 124.9576418019 deg Long. of node = 308.2784765556 deg Inclination = 14.1250526787 deg Eccentricity = 0.1115539314 Semimajor axis = 2.4616116777 AU Perihelion dist = 2.1870092174 AU Mag: H = 10.79, G = 0.15 Epoch of elements : MJD 60628.42281475 TDT (2024 Nov 14.4228) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Apr24,1.26,2024,11,14,10.147559,0.170956,-0.680140,19.148753,4.834396,0.004553,0.000421,-0.000001,0.000000 80.0019,-23.9862,23.91,-18.40,False UCAC4 330-184065,19.05642405,-24.0214384,12.21,11.37,10.92,0.1,0,,19.08132305,-23.9861842,4.90,4.90,0,0,1 623,Chimaera,16.25,43.952,3.1117,0,0,3.949,13.67,,2.8,0 0,238.3468,2024,11,14,124.9576,308.2785,14.1251,0.11155,2.46161,2.18701,10.78,5.0,0.15 1.081,0.0093,0.0010,68,0.0016,Known errors,0.87,0,-1,-1 20241114_184065,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org