IOTA/IOTA-ES occultation update for (1135) Colchis / UCAC4 321-205864 event on 2024 Oct 27, 09:40 UT Visible from Summary ------- On 2024 Oct 27 UT, the 50.9956073767376 km diameter asteroid (1135) Colchis will occult a 11.9 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 3.81 mag to 15.72 mag (the magnitude of the asteroid) for at most 1.730 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 Oct 27, 09:36 - 2024 Oct 27, 09:43 * geocentric midpoint of event [JD]: 2460610.90309000 * magnitude of target star: 11.94 * magnitude drop [mag]: 3.81 * estimated maximum duration [s]: 1.730 * Moon: 22 % sunlit, 124° distance * Sun: 68° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 83°) * approx speed of asteroid's shadow [km/s]: 29.5398 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 321-205864 by 1135 Colchis on 2024 Oct 27 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 1 0 0 .. .. .... .. .. .. .. .. .. -23 18 57 .. .. .. -23 22 17 .. .. .. .... 2 0 0 -23 32 23 9 36 59.9 1 118 60 -23 48 50 -23 15 57 -23 52 11 -23 12 37 .... 3 0 0 -24 2 4 9 37 0.0 2 118 61 -24 18 30 -23 45 39 -24 21 50 -23 42 19 0.30 4 0 0 -24 31 31 9 37 0.2 3 117 61 -24 47 56 -24 15 7 -24 51 16 -24 11 47 0.30 5 0 0 -25 0 43 9 37 0.4 4 117 62 -25 17 7 -24 44 20 -25 20 27 -24 41 1 0.30 6 0 0 -25 29 39 9 37 0.7 5 116 63 -25 46 2 -25 13 18 -25 49 22 -25 9 59 0.30 7 0 0 -25 58 20 9 37 1.1 6 116 63 -26 14 42 -25 42 0 -26 18 1 -25 38 41 0.30 8 0 0 -26 26 44 9 37 1.6 7 115 64 -26 43 4 -26 10 25 -26 46 24 -26 7 6 0.30 9 0 0 -26 54 50 9 37 2.1 8 115 65 -27 11 10 -26 38 33 -27 14 29 -26 35 14 0.30 10 0 0 -27 22 39 9 37 2.7 9 115 65 -27 38 57 -27 6 23 -27 42 15 -27 3 5 0.30 11 0 0 -27 50 9 9 37 3.4 10 114 66 -28 6 25 -27 33 55 -28 9 44 -27 30 37 0.30 12 0 0 -28 17 21 9 37 4.1 11 114 66 -28 33 35 -28 1 8 -28 36 53 -27 57 50 0.30 13 0 0 -28 44 12 9 37 4.9 12 113 67 -29 0 25 -28 28 1 -29 3 43 -28 24 44 0.30 14 0 0 -29 10 44 9 37 5.7 13 113 67 -29 26 55 -28 54 34 -29 30 13 -28 51 18 0.30 15 0 0 -29 36 55 9 37 6.6 14 112 67 -29 53 5 -29 20 48 -29 56 22 -29 17 31 0.30 16 0 0 -30 2 46 9 37 7.6 15 112 68 -30 18 53 -29 46 40 -30 22 10 -29 43 24 0.30 17 0 0 -30 28 15 9 37 8.6 16 111 68 -30 44 21 -30 12 11 -30 47 37 -30 8 55 0.30 18 0 0 -30 53 23 9 37 9.7 17 111 68 -31 9 27 -30 37 21 -31 12 42 -30 34 5 0.30 19 0 0 -31 18 9 9 37 10.8 18 110 68 -31 34 10 -31 2 8 -31 37 26 -30 58 53 0.30 20 0 0 -31 42 32 9 37 12.0 19 109 68 -31 58 32 -31 26 34 -32 1 47 -31 23 19 0.30 21 0 0 -32 6 33 9 37 13.2 20 109 69 -32 22 30 -31 50 36 -32 25 45 -31 47 22 0.30 22 0 0 -32 30 11 9 37 14.5 21 108 69 -32 46 6 -32 14 16 -32 49 20 -32 11 3 0.30 23 0 0 -32 53 25 9 37 15.8 22 108 69 -33 9 19 -32 37 33 -33 12 33 -32 34 20 0.30 24 0 0 -33 16 17 9 37 17.2 23 107 69 -33 32 8 -33 0 27 -33 35 21 -32 57 14 0.30 25 0 0 -33 38 44 9 37 18.6 23 107 69 -33 54 34 -33 22 57 -33 57 46 -33 19 44 0.30 26 0 0 -34 0 48 9 37 20.1 24 106 68 -34 16 35 -33 45 3 -34 19 48 -33 41 51 0.30 27 0 0 -34 22 28 9 37 21.6 25 105 68 -34 38 13 -34 6 45 -34 41 25 -34 3 34 0.30 28 0 0 -34 43 44 9 37 23.1 26 105 68 -34 59 27 -34 28 3 -35 2 38 -34 24 52 0.30 29 0 0 -35 4 36 9 37 24.7 27 104 68 -35 20 16 -34 48 57 -35 23 27 -34 45 46 0.30 30 0 0 -35 25 3 9 37 26.3 28 103 68 -35 40 41 -35 9 26 -35 43 52 -35 6 16 0.30 31 0 0 -35 45 6 9 37 28.0 29 103 67 -36 0 41 -35 29 31 -36 3 52 -35 26 22 0.29 32 0 0 -36 4 44 9 37 29.7 30 102 67 -36 20 17 -35 49 12 -36 23 27 -35 46 3 0.29 33 0 0 -36 23 57 9 37 31.4 31 101 67 -36 39 29 -36 8 27 -36 42 38 -36 5 19 0.29 34 0 0 -36 42 46 9 37 33.1 31 101 66 -36 58 15 -36 27 18 -37 1 24 -36 24 10 0.29 35 0 0 -37 1 10 9 37 34.9 32 100 66 -37 16 37 -36 45 45 -37 19 45 -36 42 37 0.29 36 0 0 -37 19 10 9 37 36.7 33 99 65 -37 34 34 -37 3 46 -37 37 42 -37 0 39 0.29 37 0 0 -37 36 44 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37.5 22 248 -44 -16 46 54 -16 13 50 -16 50 16 -16 10 29 0.31 175 0 0 -15 58 26 9 43 39.1 21 248 -45 -16 14 58 -15 41 55 -16 18 20 -15 38 33 0.31 176 0 0 -15 26 29 9 43 40.6 20 248 -46 -15 43 1 -15 9 58 -15 46 23 -15 6 37 0.31 177 0 0 -14 54 32 9 43 42.1 19 247 -47 -15 11 4 -14 38 2 -15 14 25 -14 34 41 0.31 178 0 0 -14 22 36 9 43 43.4 18 247 -48 -14 39 7 -14 6 7 -14 42 29 -14 2 46 0.32 179 0 0 -13 50 42 9 43 44.7 17 247 -49 -14 7 13 -13 34 14 -14 10 34 -13 30 53 0.32 180 0 0 -13 18 51 9 43 46.0 16 246 -50 -13 35 21 -13 2 24 -13 38 42 -12 59 3 0.32 -179 0 0 -12 47 4 9 43 47.1 15 246 -51 -13 3 32 -12 30 37 -13 6 53 -12 27 17 0.32 -178 0 0 -12 15 22 9 43 48.2 14 246 -52 -12 31 49 -11 58 56 -12 35 10 -11 55 36 0.32 -177 0 0 -11 43 45 9 43 49.2 12 246 -54 -12 0 11 -11 27 20 -12 3 31 -11 24 0 0.32 -176 0 0 -11 12 15 9 43 50.1 11 245 -55 -11 28 40 -10 55 51 -11 32 0 -10 52 32 0.33 -175 0 0 -10 40 52 9 43 50.9 10 245 -56 -10 57 16 -10 24 30 -11 0 36 -10 21 11 0.33 -174 0 0 -10 9 38 9 43 51.6 9 245 -57 -10 26 0 - 9 53 17 -10 29 20 - 9 49 58 0.33 -173 0 0 - 9 38 33 9 43 52.3 8 245 -58 - 9 54 54 - 9 22 14 - 9 58 13 - 9 18 55 0.34 -172 0 0 - 9 7 38 9 43 52.8 7 245 -59 - 9 23 58 - 8 51 20 - 9 27 17 - 8 48 2 0.35 -171 0 0 - 8 36 55 9 43 53.3 6 245 -60 - 8 53 12 - 8 20 38 - 8 56 31 - 8 17 20 0.35 -170 0 0 - 8 6 23 9 43 53.7 5 244 -61 - 8 22 39 - 7 50 8 - 8 25 58 - 7 46 50 0.37 -169 0 0 - 7 36 4 9 43 54.0 4 244 -62 - 7 52 18 - 7 19 51 - 7 55 36 - 7 16 33 0.39 -168 0 0 - 7 5 58 9 43 54.3 2 244 -63 - 7 22 11 - 6 49 47 - 7 25 29 - 6 46 30 0.43 -167 0 0 - 6 36 7 9 43 54.4 1 244 -64 - 6 52 18 - 6 19 58 - 6 55 36 - 6 16 41 0.55 -166 0 0 - 6 6 31 9 43 54.5 0 244 -65 - 6 22 40 - 5 50 24 - 6 25 57 - 5 47 7 1.96 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 321-205864 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 52 22.9546 DE: -25 58 09.499 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 52 22.9546 DE: -25 58 09.499 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 13.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1135) Colchis asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.027 distance from Earth [AU]: 2.65270 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 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): 0.010", 0.003", 82.996° remarks: * orbital elements for (1135)Colchis : Mean anomaly = 318.9772985714 deg Arg. of pericenter = 3.6854000065 deg Long. of node = 350.6008928201 deg Inclination = 4.5405111878 deg Eccentricity = 0.1138783496 Semimajor axis = 2.6660825017 AU Perihelion dist = 2.3624734265 AU Mag: H = 10.60, G = 0.15 Epoch of elements : MJD 60610.40308966 TDT (2024 Oct 27.4031) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,1.73,2024,10,27,9.674160,0.045513,-0.274791,16.443557,2.756932,0.005281,0.000375,-0.000001,0.000000 102.1203,-25.9406,30.85,-13.01,False UCAC4 321-205864,18.87304300,-25.9693052,13.16,11.94,11.28,0.1,4,,18.89841000,-25.9406303,3.81,4.02,0,0,0 1135,Colchis,15.72,51.188,2.6527,0,0,4.041,9.14,,2.8,0 0,318.8860,2024,10,27,3.6854,350.6009,4.5405,0.11388,2.66608,2.36247,10.59,5.0,0.15 1.102,0.0103,0.0027,83,0.0027,Known errors,0.91,0,-1,-1 20241027_205864,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org