IOTA/IOTA-ES occultation update for (1135) Colchis / UCAC4 317-195378 event on 2024 Oct 14, 02:42 UT Visible from Summary ------- On 2024 Oct 14 UT, the 51.09 km diameter asteroid (1135) Colchis will occult a 10.0 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 5.65 mag to 15.64 mag (the magnitude of the asteroid) for at most 2.040 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 14, 02:37 - 2024 Oct 14, 02:46 * geocentric midpoint of event [JD]: 2460597.61267792 * magnitude of target star: 10.00 * magnitude drop [mag]: 5.65 * estimated maximum duration [s]: 2.040 * Moon: 83 % sunlit, 56° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 85°) * approx speed of asteroid's shadow [km/s]: 25.0454 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 317-195378 by 1135 Colchis on 2024 Oct 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 125 0 0 - 2 41 20 2 38 2.0 1 117 77 - 2 56 54 - 2 25 46 - 3 0 5 - 2 22 35 .... 126 0 0 - 3 11 28 2 38 2.1 2 117 78 - 3 27 1 - 2 55 55 - 3 30 12 - 2 52 44 0.03 127 0 0 - 3 41 22 2 38 2.3 3 117 79 - 3 56 54 - 3 25 50 - 4 0 4 - 3 22 39 -0.02 128 0 0 - 4 11 2 2 38 2.6 4 116 80 - 4 26 32 - 3 55 31 - 4 29 42 - 3 52 21 -0.04 129 0 0 - 4 40 27 2 38 3.0 5 116 81 - 4 55 55 - 4 24 58 - 4 59 5 - 4 21 48 -0.05 130 0 0 - 5 9 36 2 38 3.5 6 116 82 - 5 25 3 - 4 54 8 - 5 28 13 - 4 50 59 -0.06 131 0 0 - 5 38 29 2 38 4.1 7 116 83 - 5 53 54 - 5 23 3 - 5 57 4 - 5 19 53 -0.07 132 0 0 - 6 7 4 2 38 4.7 8 116 85 - 6 22 28 - 5 51 40 - 6 25 37 - 5 48 31 -0.07 133 0 0 - 6 35 22 2 38 5.5 9 116 86 - 6 50 45 - 6 20 0 - 6 53 53 - 6 16 51 -0.07 134 0 0 - 7 3 22 2 38 6.3 11 116 87 - 7 18 42 - 6 48 1 - 7 21 51 - 6 44 52 -0.08 135 0 0 - 7 31 2 2 38 7.3 12 116 88 - 7 46 21 - 7 15 43 - 7 49 29 - 7 12 35 -0.08 136 0 0 - 7 58 23 2 38 8.3 13 116 89 - 8 13 40 - 7 43 6 - 8 16 48 - 7 39 58 -0.08 137 0 0 - 8 25 24 2 38 9.4 14 116 89 - 8 40 39 - 8 10 8 - 8 43 46 - 8 7 1 -0.08 138 0 0 - 8 52 4 2 38 10.7 15 115 89 - 9 7 17 - 8 36 50 - 9 10 24 - 8 33 43 -0.08 139 0 0 - 9 18 23 2 38 11.9 16 115 88 - 9 33 34 - 9 3 10 - 9 36 41 - 9 0 4 -0.08 140 0 0 - 9 44 20 2 38 13.3 17 115 87 - 9 59 29 - 9 29 9 -10 2 35 - 9 26 3 -0.08 141 0 0 -10 9 54 2 38 14.8 18 115 86 -10 25 2 - 9 54 46 -10 28 8 - 9 51 40 -0.09 142 0 0 -10 35 6 2 38 16.3 19 115 84 -10 50 12 -10 20 0 -10 53 18 -10 16 54 -0.09 143 0 0 -10 59 55 2 38 17.9 20 115 83 -11 14 59 -10 44 51 -11 18 4 -10 41 46 -0.09 144 0 0 -11 24 21 2 38 19.6 21 114 82 -11 39 23 -11 9 18 -11 42 27 -11 6 13 -0.09 145 0 0 -11 48 22 2 38 21.4 22 114 81 -12 3 22 -11 33 21 -12 6 26 -11 30 17 -0.09 146 0 0 -12 11 59 2 38 23.3 23 114 80 -12 26 57 -11 57 1 -12 30 1 -11 53 57 -0.09 147 0 0 -12 35 11 2 38 25.2 25 114 79 -12 50 8 -12 20 15 -12 53 11 -12 17 11 -0.09 148 0 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240 -42 - 2 42 11 - 2 10 57 - 2 45 23 - 2 7 45 -0.09 - 91 0 0 - 1 55 47 2 45 50.7 32 240 -43 - 2 11 25 - 1 40 9 - 2 14 37 - 1 36 56 -0.09 - 90 0 0 - 1 24 48 2 45 53.3 30 240 -44 - 1 40 27 - 1 9 8 - 1 43 39 - 1 5 56 -0.09 - 89 0 0 - 0 53 38 2 45 55.9 29 240 -45 - 1 9 18 - 0 37 57 - 1 12 30 - 0 34 44 -0.09 - 88 0 0 - 0 22 17 2 45 58.3 28 240 -46 - 0 37 59 - 0 6 35 - 0 41 11 - 0 3 23 -0.09 - 87 0 0 0 9 13 2 46 0.7 27 240 -47 - 0 6 30 0 24 56 - 0 9 42 0 28 8 -0.09 - 86 0 0 0 40 51 2 46 2.9 26 240 -48 0 25 8 0 56 35 0 21 55 0 59 48 -0.09 - 85 0 0 1 12 37 2 46 5.1 25 240 -50 0 56 53 1 28 21 0 53 40 1 31 35 -0.09 - 84 0 0 1 44 29 2 46 7.2 24 240 -51 1 28 45 2 0 14 1 25 31 2 3 28 -0.09 - 83 0 0 2 16 27 2 46 9.2 23 240 -52 2 0 42 2 32 13 1 57 29 2 35 27 -0.09 - 82 0 0 2 48 30 2 46 11.1 21 240 -53 2 32 45 3 4 17 2 29 31 3 7 30 -0.09 - 81 0 0 3 20 37 2 46 12.9 20 240 -54 3 4 51 3 36 24 3 1 37 3 39 38 -0.09 - 80 0 0 3 52 47 2 46 14.6 19 240 -55 3 37 0 4 8 34 3 33 46 4 11 48 -0.09 - 79 0 0 4 24 58 2 46 16.2 18 240 -56 4 9 11 4 40 46 4 5 58 4 44 0 -0.09 - 78 0 0 4 57 11 2 46 17.7 17 240 -57 4 41 24 5 12 59 4 38 10 5 16 13 -0.09 - 77 0 0 5 29 23 2 46 19.1 16 240 -58 5 13 36 5 45 11 5 10 22 5 48 25 -0.09 - 76 0 0 6 1 35 2 46 20.5 15 240 -59 5 45 48 6 17 23 5 42 34 6 20 37 -0.09 - 75 0 0 6 33 45 2 46 21.7 13 241 -60 6 17 58 6 49 33 6 14 44 6 52 47 -0.09 - 74 0 0 7 5 52 2 46 22.8 12 241 -61 6 50 5 7 21 40 6 46 51 7 24 54 -0.08 - 73 0 0 7 37 56 2 46 23.8 11 241 -62 7 22 9 7 53 43 7 18 55 7 56 57 -0.08 - 72 0 0 8 9 54 2 46 24.8 10 241 -63 7 54 8 8 25 41 7 50 54 8 28 55 -0.08 - 71 0 0 8 41 48 2 46 25.6 9 241 -64 8 26 1 8 57 34 8 22 48 9 0 48 -0.08 - 70 0 0 9 13 34 2 46 26.3 8 241 -65 8 57 49 9 29 21 8 54 35 9 32 34 -0.08 - 69 0 0 9 45 14 2 46 26.9 7 241 -66 9 29 29 10 1 0 9 26 15 10 4 13 -0.08 - 68 0 0 10 16 45 2 46 27.5 6 242 -67 10 1 1 10 32 30 9 57 48 10 35 44 -0.07 - 67 0 0 10 48 8 2 46 27.9 4 242 -68 10 32 24 11 3 52 10 29 11 11 7 5 -0.07 - 66 0 0 11 19 20 2 46 28.2 3 242 -69 11 3 37 11 35 4 11 0 24 11 38 17 -0.06 - 65 0 0 11 50 22 2 46 28.5 2 242 -70 11 34 40 12 6 5 11 31 27 12 9 18 -0.05 - 64 0 0 12 21 12 2 46 28.6 1 242 -71 12 5 31 12 36 54 12 2 18 12 40 7 0.00 - 63 0 0 12 51 51 2 46 28.7 0 243 -72 12 36 10 .. .. .. 12 32 58 .. .. .. 2.93 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 317-195378 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 31 51.4802 DE: -26 41 03.822 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 31 51.4801 DE: -26 41 03.822 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.600,0.400) * V mag [mag]: 10.0 * B mag [mag]: 10.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1135) Colchis asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.028 distance from Earth [AU]: 2.50580 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): 0.011", 0.003", 85.331° remarks: * orbital elements for (1135)Colchis : Mean anomaly = 315.9732282079 deg Arg. of pericenter = 3.6800696172 deg Long. of node = 350.6012604270 deg Inclination = 4.5404855450 deg Eccentricity = 0.1138870814 Semimajor axis = 2.6661206412 AU Perihelion dist = 2.3624839428 AU Mag: H = 10.60, G = 0.15 Epoch of elements : MJD 60597.11267775 TDT (2024 Oct 14.1127) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,2.04,2024,10,14,2.704270,-0.015003,0.100371,13.980106,2.095689,0.005457,0.000235,0.000000,0.000000 -145.3594,-26.6679,135.93,-8.29,False UCAC4 317-195378,18.53096677,-26.6843951,10.28,10.00,9.85,0.0,0,,18.55656519,-26.6678993,5.65,5.35,0,0,0 1135,Colchis,15.64,51.090,2.5058,0,0,3.660,7.36,,2.8,0 0,315.9477,2024,10,14,3.6801,350.6013,4.5405,0.11389,2.66612,2.36248,10.59,5.0,0.15 1.102,0.0107,0.0028,85,0.0029,Known errors,2.05,0,-1,-1 20241014_195378,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org