IOTA/IOTA-ES occultation update for (1135) Colchis / UCAC4 311-135302 event on 2024 Sep 16, 12:12 UT Visible from Summary ------- On 2024 Sep 16 UT, the 51.029 km diameter asteroid (1135) Colchis will occult a 11.6 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 3.80 mag to 15.39 mag (the magnitude of the asteroid) for at most 3.450 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 Sep 16, 12:05 - 2024 Sep 16, 12:20 * geocentric midpoint of event [JD]: 2460570.00883987 * magnitude of target star: 11.62 * magnitude drop [mag]: 3.80 * estimated maximum duration [s]: 3.450 * Moon: 96 % sunlit, 62° distance * Sun: 96° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.003", 90°) * approx speed of asteroid's shadow [km/s]: 14.7760 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 311-135302 by 1135 Colchis on 2024 Sep 16 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 - 4 0 0 -12 47 54 12 5 33.6 0 118 75 -13 3 44 -12 32 5 -13 7 13 -12 28 36 .... - 3 0 0 -13 19 48 12 5 33.8 1 118 74 -13 35 36 -13 3 59 -13 39 5 -13 0 31 0.17 - 2 0 0 -13 51 27 12 5 34.1 3 118 74 -14 7 14 -13 35 40 -14 10 43 -13 32 12 0.14 - 1 0 0 -14 22 52 12 5 34.5 4 118 73 -14 38 38 -14 7 6 -14 42 6 -14 3 38 0.12 0 0 0 -14 54 0 12 5 35.2 5 118 73 -15 9 45 -14 38 16 -15 13 13 -14 34 48 0.12 1 0 0 -15 24 53 12 5 35.9 6 117 72 -15 40 36 -15 9 10 -15 44 4 -15 5 43 0.11 2 0 0 -15 55 28 12 5 36.9 7 117 71 -16 11 10 -15 39 47 -16 14 38 -15 36 20 0.11 3 0 0 -16 25 46 12 5 37.9 8 117 70 -16 41 26 -16 10 6 -16 44 53 -16 6 39 0.11 4 0 0 -16 55 45 12 5 39.2 9 116 70 -17 11 24 -16 40 7 -17 14 50 -16 36 40 0.11 5 0 0 -17 25 25 12 5 40.6 10 116 69 -17 41 2 -17 9 48 -17 44 28 -17 6 22 0.11 6 0 0 -17 54 44 12 5 42.1 11 116 68 -18 10 20 -17 39 9 -18 13 45 -17 35 44 0.10 7 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33 12 19 14.2 25 243 -70 - 7 59 33 - 7 27 33 - 8 3 5 - 7 24 1 0.10 156 0 0 - 7 9 24 12 19 17.8 24 243 -72 - 7 25 25 - 6 53 24 - 7 28 56 - 6 49 52 0.10 157 0 0 - 6 35 11 12 19 21.2 22 243 -73 - 6 51 12 - 6 19 11 - 6 54 44 - 6 15 40 0.11 158 0 0 - 6 0 56 12 19 24.5 21 242 -74 - 6 16 57 - 5 44 56 - 6 20 29 - 5 41 24 0.11 159 0 0 - 5 26 39 12 19 27.6 20 242 -75 - 5 42 40 - 5 10 39 - 5 46 11 - 5 7 7 0.11 160 0 0 - 4 52 21 12 19 30.5 19 242 -76 - 5 8 22 - 4 36 21 - 5 11 54 - 4 32 50 0.11 161 0 0 - 4 18 4 12 19 33.2 18 242 -77 - 4 34 4 - 4 2 4 - 4 37 36 - 3 58 33 0.11 162 0 0 - 3 43 48 12 19 35.8 17 242 -78 - 3 59 48 - 3 27 49 - 4 3 20 - 3 24 18 0.11 163 0 0 - 3 9 35 12 19 38.3 16 242 -79 - 3 25 35 - 2 53 36 - 3 29 6 - 2 50 5 0.11 164 0 0 - 2 35 25 12 19 40.5 14 242 -80 - 2 51 24 - 2 19 27 - 2 54 55 - 2 15 56 0.11 165 0 0 - 2 1 20 12 19 42.6 13 242 -81 - 2 17 19 - 1 45 22 - 2 20 49 - 1 41 52 0.11 166 0 0 - 1 27 21 12 19 44.5 12 242 -82 - 1 43 18 - 1 11 24 - 1 46 49 - 1 7 53 0.11 167 0 0 - 0 53 28 12 19 46.2 11 242 -83 - 1 9 25 - 0 37 32 - 1 12 55 - 0 34 2 0.12 168 0 0 - 0 19 43 12 19 47.8 10 242 -84 - 0 35 39 - 0 3 48 - 0 39 9 - 0 0 18 0.12 169 0 0 0 13 53 12 19 49.2 9 242 -85 - 0 2 2 0 29 47 - 0 5 32 0 33 17 0.12 170 0 0 0 47 20 12 19 50.4 7 242 -85 0 31 26 1 3 13 0 27 56 1 6 42 0.13 171 0 0 1 20 36 12 19 51.4 6 242 -85 1 4 43 1 36 28 1 1 14 1 39 57 0.13 172 0 0 1 53 40 12 19 52.3 5 242 -85 1 37 49 2 9 31 1 34 20 2 13 0 0.14 173 0 0 2 26 32 12 19 52.9 4 242 -85 2 10 42 2 42 22 2 7 13 2 45 50 0.15 174 0 0 2 59 11 12 19 53.5 3 242 -85 2 43 23 3 14 59 2 39 54 3 18 27 0.17 175 0 0 3 31 36 12 19 53.8 2 242 -84 3 15 49 3 47 22 3 12 20 3 50 50 0.22 176 0 0 4 3 45 12 19 54.0 1 242 -83 3 48 0 4 19 30 3 44 32 4 22 58 0.45 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 311-135302 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 22.7348 DE: -27 48 33.527 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 57 22.7348 DE: -27 48 33.527 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.6 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1135) Colchis asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.032 distance from Earth [AU]: 2.18710 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): 0.012", 0.003", 89.591° remarks: * orbital elements for (1135)Colchis : Mean anomaly = 309.7328237393 deg Arg. of pericenter = 3.6704794356 deg Long. of node = 350.6019781259 deg Inclination = 4.5404441116 deg Eccentricity = 0.1139026196 Semimajor axis = 2.6661884866 AU Perihelion dist = 2.3625026337 AU Mag: H = 10.60, G = 0.15 Epoch of elements : MJD 60569.50883937 TDT (2024 Sep 16.5088) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,3.45,2024,9,16,12.212157,0.013367,-0.080193,8.224452,1.383330,0.005512,0.000032,0.000000,0.000000 90.6151,-27.8135,-4.51,2.33,False UCAC4 311-135302,17.95631526,-27.8093130,11.75,11.62,11.55,0.0,0,,17.98225528,-27.8135318,3.80,3.43,0,0,0 1135,Colchis,15.39,51.029,2.1871,0,0,2.493,5.56,,2.8,0 0,309.6176,2024,9,16,3.6705,350.6020,4.5404,0.11390,2.66619,2.36250,10.59,5.0,0.15 1.110,0.0120,0.0030,90,0.0035,Known errors,0.95,0,-1,-1 20240916_135302,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org