IOTA/IOTA-ES occultation update for (1135) Colchis / HIP 86883 event on 2024 Jul 19, 12:35 UT Visible from Summary ------- On 2024 Jul 19 UT, the 50.9737638742823 km diameter asteroid (1135) Colchis will occult a 8.6 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.79 mag to 14.42 mag (the magnitude of the asteroid) for at most 6.960 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 Jul 19, 12:21 - 2024 Jul 19, 12:50 * geocentric midpoint of event [JD]: 2460511.02499829 * magnitude of target star: 8.64 * magnitude drop [mag]: 5.79 * estimated maximum duration [s]: 6.960 * Moon: 95 % sunlit, 6° distance * Sun: 149° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.003", 92°) * approx speed of asteroid's shadow [km/s]: 7.3626 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 86883 by 1135 Colchis on 2024 Jul 19 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 63 0 0 25 1 12 12 49 55.9 1 124 23 25 18 40 24 43 45 25 22 39 24 39 47 .... 64 0 0 24 24 20 12 49 55.6 2 124 22 24 41 50 24 6 52 24 45 49 24 2 54 -0.11 65 0 0 23 47 11 12 49 54.9 3 125 21 24 4 42 23 29 42 24 8 41 23 25 44 -0.18 66 0 0 23 9 46 12 49 53.9 4 125 19 23 27 17 22 52 16 23 31 17 22 48 17 -0.21 67 0 0 22 32 5 12 49 52.5 5 126 18 22 49 38 22 14 35 22 53 37 22 10 36 -0.23 68 0 0 21 54 11 12 49 50.8 6 126 17 22 11 44 21 36 40 22 15 44 21 32 41 -0.25 69 0 0 21 16 4 12 49 48.7 7 126 16 21 33 37 20 58 33 21 37 37 20 54 34 -0.25 70 0 0 20 37 46 12 49 46.3 8 127 15 20 55 19 20 20 14 20 59 19 20 16 15 -0.26 71 0 0 19 59 17 12 49 43.6 10 127 14 20 16 51 19 41 46 20 20 51 19 37 47 -0.27 72 0 0 19 20 40 12 49 40.5 11 127 13 19 38 13 19 3 8 19 42 13 18 59 9 -0.27 73 0 0 18 41 55 12 49 37.0 12 128 12 18 59 28 18 24 24 19 3 28 18 20 25 -0.27 74 0 0 18 3 4 12 49 33.2 13 128 11 18 20 37 17 45 33 18 24 36 17 41 34 -0.28 75 0 0 17 24 8 12 49 29.0 14 128 10 17 41 40 17 6 38 17 45 40 17 2 39 -0.28 76 0 0 16 45 8 12 49 24.5 15 129 9 17 2 40 16 27 39 17 6 39 16 23 40 -0.28 77 0 0 16 6 6 12 49 19.7 16 129 8 16 23 37 15 48 38 16 27 36 15 44 39 -0.28 78 0 0 15 27 3 12 49 14.5 18 129 7 15 44 33 15 9 36 15 48 32 15 5 38 -0.28 79 0 0 14 48 1 12 49 8.9 19 130 5 15 5 29 14 30 34 15 9 28 14 26 37 -0.28 80 0 0 14 9 0 12 49 3.0 20 130 4 14 26 27 13 51 35 14 30 25 13 47 37 -0.28 81 0 0 13 30 2 12 48 56.8 21 130 3 13 47 28 13 12 38 13 51 26 13 8 41 -0.29 82 0 0 12 51 8 12 48 50.2 22 130 2 13 8 32 12 33 46 13 12 30 12 29 49 -0.29 83 0 0 12 12 20 12 48 43.3 23 131 1 12 29 42 11 55 0 12 33 40 11 51 3 -0.29 84 0 0 11 33 39 12 48 36.1 24 131 0 11 50 59 11 16 20 11 54 56 11 12 24 -0.29 85 0 0 10 55 5 12 48 28.5 26 131 -1 11 12 23 10 37 48 11 16 20 10 33 53 -0.29 86 0 0 10 16 40 12 48 20.6 27 131 -2 10 33 57 9 59 26 10 37 53 9 55 31 -0.29 87 0 0 9 38 26 12 48 12.5 28 132 -3 9 55 40 9 21 13 9 59 36 9 17 19 -0.29 88 0 0 9 0 23 12 48 4.0 29 132 -5 9 17 35 8 43 13 9 21 30 8 39 19 -0.29 89 0 0 8 22 33 12 47 55.2 30 132 -6 8 39 43 8 5 25 8 43 37 8 1 31 -0.29 90 0 0 7 44 56 12 47 46.1 31 132 -7 8 2 3 7 27 50 8 5 57 7 23 57 -0.29 91 0 0 7 7 34 12 47 36.8 32 133 -8 7 24 39 6 50 31 7 28 32 6 46 38 -0.29 92 0 0 6 30 28 12 47 27.2 33 133 -9 6 47 30 6 13 27 6 51 23 6 9 35 -0.29 93 0 0 5 53 38 12 47 17.3 35 133 -10 6 10 37 5 36 40 6 14 30 5 32 48 -0.29 94 0 0 5 17 6 12 47 7.1 36 133 -11 5 34 3 5 0 10 5 37 54 4 56 20 -0.29 95 0 0 4 40 52 12 46 56.7 37 134 -12 4 57 46 4 23 59 5 1 37 4 20 9 -0.29 96 0 0 4 4 57 12 46 46.1 38 134 -14 4 21 49 3 48 8 4 25 39 3 44 18 -0.29 97 0 0 3 29 23 12 46 35.2 39 134 -15 3 46 12 3 12 36 3 50 1 3 8 48 -0.29 98 0 0 2 54 10 12 46 24.1 40 134 -16 3 10 56 2 37 26 3 14 45 2 33 38 -0.29 99 0 0 2 19 19 12 46 12.7 41 135 -17 2 36 1 2 2 38 2 39 50 1 58 50 -0.29 100 0 0 1 44 50 12 46 1.2 42 135 -18 2 1 29 1 28 12 2 5 17 1 24 25 -0.29 101 0 0 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- 6 40 10 - 7 12 3 - 6 36 32 - 7 15 40 -0.30 -140 0 0 - 6 28 15 12 22 32.8 15 240 -45 - 6 12 14 - 6 44 14 - 6 8 35 - 6 47 52 -0.30 -139 0 0 - 5 59 48 12 22 28.6 14 240 -44 - 5 43 44 - 6 15 51 - 5 40 4 - 6 19 29 -0.30 -138 0 0 - 5 30 47 12 22 24.8 12 240 -43 - 5 14 39 - 5 46 54 - 5 10 59 - 5 50 33 -0.30 -137 0 0 - 5 1 13 12 22 21.2 11 240 -42 - 4 45 2 - 5 17 23 - 4 41 20 - 5 21 3 -0.30 -136 0 0 - 4 31 5 12 22 18.0 10 240 -41 - 4 14 50 - 4 47 19 - 4 11 8 - 4 51 0 -0.30 -135 0 0 - 4 0 24 12 22 15.0 9 240 -40 - 3 44 6 - 4 16 41 - 3 40 23 - 4 20 23 -0.30 -134 0 0 - 3 29 11 12 22 12.4 8 240 -38 - 3 12 48 - 3 45 31 - 3 9 5 - 3 49 14 -0.30 -133 0 0 - 2 57 24 12 22 10.1 7 240 -37 - 2 40 58 - 3 13 49 - 2 37 14 - 3 17 32 -0.30 -132 0 0 - 2 25 6 12 22 8.2 6 240 -36 - 2 8 36 - 2 41 34 - 2 4 51 - 2 45 19 -0.30 -131 0 0 - 1 52 16 12 22 6.5 5 240 -35 - 1 35 43 - 2 8 48 - 1 31 57 - 2 12 33 -0.30 -130 0 0 - 1 18 55 12 22 5.2 4 240 -34 - 1 2 18 - 1 35 30 - 0 58 31 - 1 39 17 -0.30 -129 0 0 - 0 45 3 12 22 4.3 2 240 -33 - 0 28 22 - 1 1 42 - 0 24 35 - 1 5 29 -0.30 -128 0 0 - 0 10 41 12 22 3.7 1 240 -32 0 6 3 - 0 27 24 0 9 52 - 0 31 12 -0.31 -127 0 0 0 24 10 12 22 3.5 0 240 -31 .. .. .. 0 7 24 .. .. .. 0 3 35 -0.36 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: HIP 86883 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 45 06.9296 DE: -30 10 59.276 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 45 06.9296 DE: -30 10 59.276 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 8.6 * B mag [mag]: 9.3 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1135) Colchis asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.043 distance from Earth [AU]: 1.63550 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): 0.017", 0.003", 91.817° remarks: * orbital elements for (1135)Colchis : Mean anomaly = 296.3973467301 deg Arg. of pericenter = 3.6523003160 deg Long. of node = 350.6038363734 deg Inclination = 4.5403761388 deg Eccentricity = 0.1139324469 Semimajor axis = 2.6663117409 AU Perihelion dist = 2.3625323199 AU Mag: H = 10.60, G = 0.15 Epoch of elements : MJD 60510.52499909 TDT (2024 Jul 19.5250) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,6.96,2024,7,19,12.599959,0.065251,0.251522,-4.022729,1.042685,0.002763,0.000494,0.000001,0.000000 139.8792,-30.1943,-7.40,20.69,False HIP 86883,17.75192490,-30.1831322,9.31,8.64,8.28,0.2,0,,17.77850545,-30.1943286,5.78,5.69,0,0,0 1135,Colchis,14.42,51.211,1.6355,0,0,-1.667,5.61,,2.8,0 0,296.2785,2024,7,19,3.6523,350.6038,4.5404,0.11393,2.66631,2.36253,10.59,5.0,0.15 1.114,0.0167,0.0033,92,0.0049,Known errors,0.91,0,-1,-1 20240719__86883,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org