IOTA/IOTA-ES occultation update for (1135) Colchis / TYC 6865-01441-1 event on 2024 Oct 12, 18:59 UT Visible from Summary ------- On 2024 Oct 12 UT, the 51.0603495133178 km diameter asteroid (1135) Colchis will occult a 10.2 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 5.47 mag to 15.63 mag (the magnitude of the asteroid) for at most 2.080 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 12, 18:54 - 2024 Oct 12, 19:03 * geocentric midpoint of event [JD]: 2460596.29105083 * magnitude of target star: 10.17 * magnitude drop [mag]: 5.47 * estimated maximum duration [s]: 2.080 * Moon: 71 % sunlit, 38° distance * Sun: 77° 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", 86°) * approx speed of asteroid's shadow [km/s]: 24.5822 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6865-01441-1 by 1135 Colchis on 2024 Oct 12 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 -123 0 0 -10 44 42 18 54 47.9 0 117 74 -11 0 22 .. .. .. -11 3 32 .. .. .. .... -122 0 0 -11 15 8 18 54 47.9 1 117 75 -11 30 47 -10 59 29 -11 33 57 -10 56 19 0.17 -121 0 0 -11 45 21 18 54 48.1 2 117 76 -12 0 59 -11 29 43 -12 4 9 -11 26 34 0.12 -120 0 0 -12 15 21 18 54 48.3 3 117 77 -12 30 58 -11 59 45 -12 34 8 -11 56 35 0.10 -119 0 0 -12 45 7 18 54 48.7 5 116 77 -13 0 43 -12 29 32 -13 3 53 -12 26 23 0.09 -118 0 0 -13 14 39 18 54 49.1 6 116 78 -13 30 13 -12 59 5 -13 33 22 -12 55 56 0.09 -117 0 0 -13 43 55 18 54 49.7 7 116 79 -13 59 28 -13 28 22 -14 2 37 -13 25 13 0.09 -116 0 0 -14 12 55 18 54 50.3 8 116 79 -14 28 27 -13 57 23 -14 31 35 -13 54 15 0.08 -115 0 0 -14 41 38 18 54 51.0 9 115 80 -14 57 8 -14 26 8 -15 0 17 -14 23 0 0.08 -114 0 0 -15 10 4 18 54 51.8 10 115 80 -15 25 33 -14 54 35 -15 28 41 -14 51 27 0.08 -113 0 0 -15 38 12 18 54 52.7 11 115 80 -15 53 39 -15 22 44 -15 56 46 -15 19 37 0.08 -112 0 0 -16 6 1 18 54 53.7 12 115 80 -16 21 27 -15 50 35 -16 24 34 -15 47 28 0.08 -111 0 0 -16 33 31 18 54 54.7 13 114 80 -16 48 55 -16 18 7 -16 52 2 -16 15 0 0.08 -110 0 0 -17 0 41 18 54 55.9 14 114 80 -17 16 3 -16 45 19 -17 19 10 -16 42 12 0.08 -109 0 0 -17 27 31 18 54 57.1 15 114 80 -17 42 52 -17 12 11 -17 45 58 -17 9 4 0.07 -108 0 0 -17 54 0 18 54 58.4 16 113 80 -18 9 19 -17 38 42 -18 12 25 -17 35 36 0.07 -107 0 0 -18 20 8 18 54 59.8 17 113 79 -18 35 25 -18 4 51 -18 38 31 -18 1 46 0.07 -106 0 0 -18 45 55 18 55 1.2 18 113 79 -19 1 10 -18 30 40 -19 4 15 -18 27 35 0.07 -105 0 0 -19 11 19 18 55 2.8 19 112 78 -19 26 32 -18 56 6 -19 29 37 -18 53 1 0.07 -104 0 0 -19 36 21 18 55 4.4 20 112 78 -19 51 32 -19 21 9 -19 54 37 -19 18 5 0.07 -103 0 0 -20 1 0 18 55 6.1 22 112 77 -20 16 9 -19 45 50 -20 19 13 -19 42 46 0.07 -102 0 0 -20 25 15 18 55 7.8 23 111 76 -20 40 23 -20 10 8 -20 43 26 -20 7 4 0.07 -101 0 0 -20 49 7 18 55 9.6 24 111 76 -21 4 13 -20 34 2 -21 7 16 -20 30 59 0.07 -100 0 0 -21 12 35 18 55 11.5 25 111 75 -21 27 39 -20 57 32 -21 30 42 -20 54 29 0.07 - 99 0 0 -21 35 39 18 55 13.5 26 110 74 -21 50 41 -21 20 37 -21 53 43 -21 17 35 0.07 - 98 0 0 -21 58 18 18 55 15.5 27 110 73 -22 13 18 -21 43 19 -22 16 20 -21 40 17 0.07 - 97 0 0 -22 20 33 18 55 17.6 28 110 72 -22 35 31 -22 5 35 -22 38 32 -22 2 34 0.07 - 96 0 0 -22 42 22 18 55 19.7 29 109 72 -22 57 18 -22 27 27 -23 0 19 -22 24 26 0.07 - 95 0 0 -23 3 47 18 55 21.9 30 109 71 -23 18 40 -22 48 53 -23 21 41 -22 45 53 0.07 - 94 0 0 -23 24 46 18 55 24.2 31 108 70 -23 39 37 -23 9 54 -23 42 38 -23 6 54 0.07 - 93 0 0 -23 45 19 18 55 26.5 32 108 69 -24 0 9 -23 30 30 -24 3 9 -23 27 30 0.07 - 92 0 0 -24 5 27 18 55 28.9 33 107 68 -24 20 14 -23 50 39 -24 23 14 -23 47 40 0.07 - 91 0 0 -24 25 8 18 55 31.3 34 107 67 -24 39 54 -24 10 23 -24 42 53 -24 7 24 0.07 - 90 0 0 -24 44 24 18 55 33.8 34 107 66 -24 59 8 -24 29 41 -25 2 6 -24 26 42 0.07 - 89 0 0 -25 3 13 18 55 36.3 35 106 65 -25 17 55 -24 48 32 -25 20 53 -24 45 34 0.07 - 88 0 0 -25 21 37 18 55 38.9 36 106 65 -25 36 16 -25 6 57 -25 39 14 -25 3 59 0.07 - 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9 57 6 0.07 31 0 0 - 9 44 50 19 2 50.0 30 245 -47 -10 0 34 - 9 29 6 -10 3 45 - 9 25 56 0.07 32 0 0 - 9 13 31 19 2 52.5 29 244 -48 - 9 29 16 - 8 57 46 - 9 32 27 - 8 54 35 0.07 33 0 0 - 8 42 2 19 2 55.0 28 244 -49 - 8 57 47 - 8 26 16 - 9 0 58 - 8 23 5 0.07 34 0 0 - 8 10 24 19 2 57.3 27 244 -50 - 8 26 10 - 7 54 38 - 8 29 21 - 7 51 26 0.07 35 0 0 - 7 38 38 19 2 59.6 26 244 -51 - 7 54 25 - 7 22 51 - 7 57 36 - 7 19 40 0.08 36 0 0 - 7 6 45 19 3 1.8 25 244 -52 - 7 22 32 - 6 50 58 - 7 25 44 - 6 47 46 0.08 37 0 0 - 6 34 46 19 3 3.9 24 244 -53 - 6 50 34 - 6 18 59 - 6 53 46 - 6 15 47 0.08 38 0 0 - 6 2 42 19 3 6.0 23 244 -54 - 6 18 30 - 5 46 54 - 6 21 42 - 5 43 43 0.08 39 0 0 - 5 30 34 19 3 7.9 21 243 -56 - 5 46 22 - 5 14 46 - 5 49 34 - 5 11 34 0.08 40 0 0 - 4 58 23 19 3 9.7 20 243 -57 - 5 14 11 - 4 42 35 - 5 17 23 - 4 39 23 0.08 41 0 0 - 4 26 9 19 3 11.5 19 243 -58 - 4 41 58 - 4 10 21 - 4 45 9 - 4 7 9 0.08 42 0 0 - 3 53 54 19 3 13.1 18 243 -59 - 4 9 43 - 3 38 6 - 4 12 54 - 3 34 54 0.08 43 0 0 - 3 21 39 19 3 14.7 17 243 -60 - 3 37 27 - 3 5 51 - 3 40 39 - 3 2 39 0.08 44 0 0 - 2 49 24 19 3 16.1 16 243 -61 - 3 5 12 - 2 33 36 - 3 8 24 - 2 30 24 0.08 45 0 0 - 2 17 10 19 3 17.4 15 243 -62 - 2 32 58 - 2 1 23 - 2 36 10 - 1 58 11 0.08 46 0 0 - 1 44 59 19 3 18.7 13 243 -64 - 2 0 47 - 1 29 12 - 2 3 59 - 1 26 1 0.08 47 0 0 - 1 12 52 19 3 19.8 12 243 -65 - 1 28 39 - 0 57 5 - 1 31 50 - 0 53 54 0.09 48 0 0 - 0 40 48 19 3 20.9 11 243 -66 - 0 56 35 - 0 25 2 - 0 59 46 - 0 21 51 0.09 49 0 0 - 0 8 50 19 3 21.8 10 243 -67 - 0 24 36 0 6 55 - 0 27 48 0 10 6 0.09 50 0 0 0 23 2 19 3 22.7 9 243 -68 0 7 16 0 38 46 0 4 5 0 41 57 0.09 51 0 0 0 54 47 19 3 23.4 8 243 -69 0 39 2 1 10 31 0 35 51 1 13 41 0.09 52 0 0 1 26 24 19 3 24.1 7 243 -70 1 10 40 1 42 7 1 7 29 1 45 18 0.10 53 0 0 1 57 52 19 3 24.6 6 243 -71 1 42 9 2 13 34 1 38 59 2 16 45 0.10 54 0 0 2 29 11 19 3 25.1 4 243 -73 2 13 29 2 44 52 2 10 19 2 48 2 0.11 55 0 0 3 0 19 19 3 25.4 3 243 -74 2 44 38 3 15 59 2 41 28 3 19 9 0.13 56 0 0 3 31 16 19 3 25.6 2 243 -75 3 15 37 3 46 55 3 12 27 3 50 5 0.16 57 0 0 4 2 1 19 3 25.8 1 243 -76 3 46 23 4 17 39 3 43 13 4 20 48 0.26 58 0 0 .. .. .... .. .. .. .. .. .. 4 16 56 .. .. .. 4 13 46 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6865-01441-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 29 55.9964 DE: -26 44 50.075 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 29 55.9964 DE: -26 44 50.075 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.2 * B mag [mag]: 11.1 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1135) Colchis asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.028 distance from Earth [AU]: 2.49080 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", 85.556° remarks: * orbital elements for (1135)Colchis : Mean anomaly = 315.6744809186 deg Arg. of pericenter = 3.6795623446 deg Long. of node = 350.6012962145 deg Inclination = 4.5404832151 deg Eccentricity = 0.1138878884 Semimajor axis = 2.6661242182 AU Perihelion dist = 2.3624849607 AU Mag: H = 10.60, G = 0.15 Epoch of elements : MJD 60595.79105063 TDT (2024 Oct 12.7911) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,2.08,2024,10,12,18.985220,0.008669,-0.059666,13.723919,2.041245,0.005483,0.000223,0.000000,0.000000 -28.7519,-26.7319,-108.20,-7.80,False TYC 6865-01441-1,18.49888793,-26.7472431,11.09,10.17,9.67,0.1,0,,18.52450714,-26.7318761,5.47,5.52,0,0,0 1135,Colchis,15.63,51.241,2.4908,0,0,3.617,7.21,,2.8,0 0,315.4954,2024,10,12,3.6796,350.6013,4.5405,0.11389,2.66612,2.36248,10.59,5.0,0.15 1.101,0.0107,0.0028,86,0.0029,Known errors,0.74,0,-1,-1 20241012_1441-1,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org