IOTA/IOTA-ES occultation update for (1135) Colchis / UCAC4 297-176421 event on 2024 Jun 16, 05:00 UT Visible from Summary ------- On 2024 Jun 16 UT, the 51.016 km diameter asteroid (1135) Colchis will occult a 11.4 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 2.73 mag to 14.06 mag (the magnitude of the asteroid) for at most 4.940 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 Jun 16, 04:50 - 2024 Jun 16, 05:10 * geocentric midpoint of event [JD]: 2460477.70869687 * magnitude of target star: 11.42 * magnitude drop [mag]: 2.73 * estimated maximum duration [s]: 4.940 * Moon: 68 % sunlit, 77° distance * Sun: 169° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 52 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 88°) * approx speed of asteroid's shadow [km/s]: 10.3195 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 297-176421 by 1135 Colchis on 2024 Jun 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 -165 0 0 -12 32 53 5 10 38.3 1 121 -7 -12 16 26 -12 49 21 -12 14 7 -12 51 41 .... -164 0 0 -13 8 54 5 10 38.1 2 121 -8 -12 52 28 -13 25 21 -12 50 8 -13 27 41 0.21 -163 0 0 -13 44 47 5 10 37.5 3 121 -9 -13 28 21 -14 1 14 -13 26 1 -14 3 33 0.20 -162 0 0 -14 20 30 5 10 36.8 4 121 -11 -14 4 5 -14 36 57 -14 1 45 -14 39 16 0.19 -161 0 0 -14 56 3 5 10 35.8 5 120 -12 -14 39 39 -15 12 29 -14 37 19 -15 14 49 0.18 -160 0 0 -15 31 25 5 10 34.6 6 120 -13 -15 15 1 -15 47 50 -15 12 42 -15 50 10 0.18 -159 0 0 -16 6 35 5 10 33.1 7 120 -14 -15 50 12 -16 22 59 -15 47 53 -16 25 19 0.18 -158 0 0 -16 41 32 5 10 31.4 8 120 -15 -16 25 9 -16 57 55 -16 22 50 -17 0 14 0.18 -157 0 0 -17 16 14 5 10 29.5 10 119 -16 -16 59 53 -17 32 36 -16 57 34 -17 34 55 0.18 -156 0 0 -17 50 41 5 10 27.4 11 119 -17 -17 34 21 -18 7 2 -17 32 2 -18 9 21 0.18 -155 0 0 -18 24 52 5 10 25.0 12 119 -18 -18 8 34 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17 242 -7 -15 0 43 -15 33 28 -14 58 24 -15 35 47 0.19 17 0 0 -14 41 59 4 50 48.0 16 242 -6 -14 25 36 -14 58 23 -14 23 17 -15 0 42 0.19 18 0 0 -14 6 43 4 50 44.8 15 241 -5 -13 50 19 -14 23 7 -13 48 0 -14 25 26 0.19 19 0 0 -13 31 17 4 50 41.8 13 241 -4 -13 14 53 -13 47 41 -13 12 34 -13 50 1 0.19 20 0 0 -12 55 42 4 50 39.0 12 241 -3 -12 39 18 -13 12 7 -12 36 59 -13 14 26 0.19 21 0 0 -12 20 0 4 50 36.5 11 241 -2 -12 3 36 -12 36 25 -12 1 16 -12 38 45 0.19 22 0 0 -11 44 12 4 50 34.2 10 240 -1 -11 27 47 -12 0 37 -11 25 28 -12 2 56 0.20 23 0 0 -11 8 18 4 50 32.1 9 240 1 -10 51 53 -11 24 43 -10 49 34 -11 27 3 0.20 24 0 0 -10 32 20 4 50 30.2 8 240 2 -10 15 55 -10 48 45 -10 13 36 -10 51 4 0.20 25 0 0 - 9 56 18 4 50 28.7 7 240 3 - 9 39 54 -10 12 43 - 9 37 35 -10 15 3 0.21 26 0 0 - 9 20 15 4 50 27.3 6 240 4 - 9 3 51 - 9 36 40 - 9 1 32 - 9 38 59 0.22 27 0 0 - 8 44 11 4 50 26.2 4 240 5 - 8 27 47 - 9 0 35 - 8 25 28 - 9 2 55 0.23 28 0 0 - 8 8 7 4 50 25.4 3 239 6 - 7 51 44 - 8 24 30 - 7 49 25 - 8 26 50 0.25 29 0 0 - 7 32 4 4 50 24.8 2 239 7 - 7 15 42 - 7 48 27 - 7 13 22 - 7 50 47 0.30 30 0 0 - 6 56 4 4 50 24.5 1 239 9 - 6 39 42 - 7 12 26 - 6 37 23 - 7 14 45 0.47 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 297-176421 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 24.3519 DE: -30 41 39.520 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 16 24.3519 DE: -30 41 39.520 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * B mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1135) Colchis asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.044 distance from Earth [AU]: 1.59640 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): 0.018", 0.003", 87.6° remarks: * orbital elements for (1135)Colchis : Mean anomaly = 288.8653323669 deg Arg. of pericenter = 3.6424183892 deg Long. of node = 350.6051959133 deg Inclination = 4.5403502884 deg Eccentricity = 0.1139503423 Semimajor axis = 2.6663744272 AU Perihelion dist = 2.3625401485 AU Mag: H = 10.60, G = 0.15 Epoch of elements : MJD 60477.20869745 TDT (2024 Jun 16.2087) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,4.94,2024,6,16,5.008725,0.011006,-0.187711,-5.814586,-0.341390,-0.000788,0.000666,0.000001,0.000000 -65.5906,-30.6862,105.07,23.36,False UCAC4 297-176421,18.27343108,-30.6943111,11.34,11.42,11.46,0.0,0,,18.30004752,-30.6861979,1.01,1.93,1,0,1 1135,Colchis,14.06,51.016,1.5964,0,0,-2.483,-1.88,,2.8,0 0,288.8181,2024,6,16,3.6424,350.6052,4.5404,0.11395,2.66637,2.36254,10.59,5.0,0.15 1.071,0.0177,0.0031,88,0.0031,Known errors,0.62,0,-1,-1 20240616_176421,60139.39 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org