IOTA/IOTA-ES occultation update for (3142) Kilopi / TYC 6890-00050-1 event on 2024 Oct 28, 02:17 UT Visible from Summary ------- On 2024 Oct 28 UT, the 8.00560589042257 km diameter asteroid (3142) Kilopi will occult a 9.7 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 8.09 mag to 17.78 mag (the magnitude of the asteroid) for at most 0.360 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: 85 * date and approx. time of event: 2024 Oct 28, 02:13 - 2024 Oct 28, 02:21 * geocentric midpoint of event [JD]: 2460611.59524638 * magnitude of target star: 9.69 * magnitude drop [mag]: 8.09 * estimated maximum duration [s]: 0.360 * Moon: 16 % sunlit, 126° distance * Sun: 79° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.60 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.002", 66°) * approx speed of asteroid's shadow [km/s]: 22.5714 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6890-00050-1 by 3142 Kilopi on 2024 Oct 28 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 107 0 0 -49 15 49 2 13 11.1 0 126 44 -49 19 6 -49 12 32 -49 23 6 -49 8 32 .... 108 0 0 -49 44 36 2 13 11.1 1 125 44 -49 47 53 -49 41 20 -49 51 52 -49 37 21 0.59 109 0 0 -50 12 52 2 13 11.3 2 125 44 -50 16 8 -50 9 36 -50 20 6 -50 5 38 0.62 110 0 0 -50 40 36 2 13 11.4 3 124 44 -50 43 51 -50 37 20 -50 47 48 -50 33 23 0.63 111 0 0 -51 7 47 2 13 11.7 3 123 44 -51 11 1 -51 4 32 -51 14 58 -51 0 36 0.63 112 0 0 -51 34 25 2 13 12.0 4 122 44 -51 37 39 -51 31 12 -51 41 35 -51 27 17 0.63 113 0 0 -52 0 32 2 13 12.4 5 122 45 -52 3 45 -51 57 19 -52 7 40 -51 53 25 0.64 114 0 0 -52 26 6 2 13 12.8 6 121 45 -52 29 18 -52 22 54 -52 33 12 -52 19 0 0.64 115 0 0 -52 51 7 2 13 13.2 6 120 45 -52 54 19 -52 47 56 -52 58 12 -52 44 3 0.64 116 0 0 -53 15 37 2 13 13.8 7 119 45 -53 18 48 -53 12 26 -53 22 40 -53 8 34 0.64 117 0 0 -53 39 34 2 13 14.3 8 118 45 -53 42 44 -53 36 24 -53 46 35 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55 0.75 - 46 0 0 -10 51 5 2 21 6.7 4 247 -65 -10 54 1 -10 48 9 -10 57 35 -10 44 35 0.77 - 45 0 0 -10 23 20 2 21 7.1 3 247 -66 -10 26 15 -10 20 25 -10 29 49 -10 16 52 0.82 - 44 0 0 - 9 56 12 2 21 7.3 2 247 -66 - 9 59 7 - 9 53 18 -10 2 39 - 9 49 46 0.91 - 43 0 0 - 9 29 42 2 21 7.5 1 247 -67 - 9 32 36 - 9 26 48 - 9 36 7 - 9 23 17 1.27 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6890-00050-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 42 46.0484 DE: -23 04 00.505 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 42 46.0481 DE: -23 04 00.506 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.7 * B mag [mag]: 9.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3142) Kilopi asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.004 distance from Earth [AU]: 2.79060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.010", 0.002", 66.055° remarks: * orbital elements for (3142)Kilopi : Mean anomaly = 160.8679193908 deg Arg. of pericenter = 189.0709374428 deg Long. of node = 320.8835454344 deg Inclination = 14.2058942075 deg Eccentricity = 0.0905029819 Semimajor axis = 2.5527194498 AU Perihelion dist = 2.3216907277 AU Mag: H = 12.32, G = 0.15 Epoch of elements : MJD 60611.09524625 TDT (2024 Oct 28.0952) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr24,0.36,2024,10,28,2.285913,0.206087,-0.494692,11.769654,4.876571,0.005652,0.000968,0.000000,0.000000 -135.1532,-23.0093,141.66,-13.24,False TYC 6890-00050-1,19.71279127,-23.0668068,9.93,9.69,9.56,0.1,0,,19.73741467,-23.0093350,8.09,7.77,0,0,0 3142,Kilopi,17.78,8.208,2.7906,0,0,2.686,15.37,,0.8,0 0,160.8449,2024,10,28,189.0709,320.8835,14.2059,0.09050,2.55272,2.32169,12.32,5.0,0.15 1.608,0.0100,0.0024,66,0.0024,Known errors,1.01,0,-1,-1 20241028_0050-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org