IOTA/IOTA-ES occultation update for (158) Koronis / UCAC4 349-179913 event on 2024 Oct 02, 12:49 UT Visible from Summary ------- On 2024 Oct 02 UT, the 35.8150248891979 km diameter asteroid (158) Koronis will occult a 12.0 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 2.61 mag to 14.48 mag (the magnitude of the asteroid) for at most 4.440 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 Oct 02, 12:37 - 2024 Oct 02, 13:02 * geocentric midpoint of event [JD]: 2460586.03469138 * magnitude of target star: 11.97 * magnitude drop [mag]: 2.61 * estimated maximum duration [s]: 4.440 * Moon: 0 % sunlit, 109° distance * Sun: 106° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.004", 78°) * approx speed of asteroid's shadow [km/s]: 8.1142 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 349-179913 by 158 Koronis on 2024 Oct 2 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 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -27 30 4 .. .. .. .... - 3 0 0 -27 37 11 12 37 33.0 1 112 65 -27 48 26 -27 25 58 -27 52 33 -27 21 51 .... - 2 0 0 -27 59 30 12 37 33.4 2 112 64 -28 10 43 -27 48 17 -28 14 51 -27 44 10 0.34 - 1 0 0 -28 21 35 12 37 34.0 3 111 63 -28 32 48 -28 10 23 -28 36 55 -28 6 17 0.35 0 0 0 -28 43 27 12 37 34.8 4 111 63 -28 54 40 -28 32 16 -28 58 46 -28 28 10 0.35 1 0 0 -29 5 6 12 37 35.8 5 110 62 -29 16 17 -28 53 55 -29 20 24 -28 49 49 0.35 2 0 0 -29 26 30 12 37 37.0 6 110 61 -29 37 41 -29 15 21 -29 41 47 -29 11 15 0.35 3 0 0 -29 47 40 12 37 38.5 7 110 60 -29 58 50 -29 36 31 -30 2 56 -29 32 26 0.35 4 0 0 -30 8 35 12 37 40.2 8 109 60 -30 19 44 -29 57 27 -30 23 50 -29 53 22 0.35 5 0 0 -30 29 15 12 37 42.1 8 108 59 -30 40 23 -30 18 8 -30 44 29 -30 14 3 0.35 6 0 0 -30 49 40 12 37 44.2 9 108 58 -31 0 47 -30 38 33 -31 4 52 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-14 35 27 -15 2 16 -14 31 17 0.38 167 0 0 -14 21 8 13 1 43.0 18 253 -71 -14 32 28 -14 9 50 -14 36 38 -14 5 41 0.38 168 0 0 -13 55 38 13 1 47.6 17 253 -71 -14 6 57 -13 44 20 -14 11 6 -13 40 11 0.38 169 0 0 -13 30 15 13 1 51.9 16 252 -71 -13 41 33 -13 18 57 -13 45 42 -13 14 49 0.38 170 0 0 -13 5 0 13 1 55.9 14 252 -71 -13 16 18 -12 53 43 -13 20 26 -12 49 35 0.38 171 0 0 -12 39 55 13 1 59.7 13 252 -71 -12 51 11 -12 28 39 -12 55 20 -12 24 31 0.38 172 0 0 -12 14 59 13 2 3.1 12 252 -71 -12 26 14 -12 3 43 -12 30 23 -11 59 36 0.39 173 0 0 -11 50 13 13 2 6.3 11 251 -71 -12 1 28 -11 38 59 -12 5 36 -11 34 51 0.39 174 0 0 -11 25 38 13 2 9.2 10 251 -70 -11 36 52 -11 14 25 -11 41 0 -11 10 18 0.39 175 0 0 -11 1 14 13 2 11.8 9 251 -70 -11 12 28 -10 50 2 -11 16 35 -10 45 56 0.40 176 0 0 -10 37 3 13 2 14.1 8 251 -70 -10 48 15 -10 25 52 -10 52 22 -10 21 46 0.40 177 0 0 -10 13 4 13 2 16.1 7 251 -69 -10 24 15 -10 1 54 -10 28 22 - 9 57 48 0.41 178 0 0 - 9 49 19 13 2 17.9 6 250 -69 -10 0 29 - 9 38 9 -10 4 35 - 9 34 4 0.41 179 0 0 - 9 25 46 13 2 19.3 5 250 -68 - 9 36 56 - 9 14 38 - 9 41 1 - 9 10 33 0.43 180 0 0 - 9 2 29 13 2 20.5 4 250 -68 - 9 13 37 - 8 51 21 - 9 17 42 - 8 47 17 0.44 -179 0 0 - 8 39 25 13 2 21.4 3 250 -67 - 8 50 33 - 8 28 19 - 8 54 38 - 8 24 15 0.48 -178 0 0 - 8 16 37 13 2 22.0 2 250 -66 - 8 27 43 - 8 5 32 - 8 31 48 - 8 1 28 0.55 -177 0 0 - 7 54 5 13 2 22.3 1 250 -66 - 8 5 10 - 7 43 1 - 8 9 14 - 7 38 57 0.90 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 349-179913 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 50 48.4237 DE: -20 15 51.698 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 50 48.4237 DE: -20 15 51.698 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.0 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (158) Koronis asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.020 distance from Earth [AU]: 2.46770 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.014", 0.004", 78.484° remarks: * orbital elements for (158)Koronis : Mean anomaly = 256.0414685973 deg Arg. of pericenter = 147.2455348158 deg Long. of node = 277.6466004703 deg Inclination = 1.0057189189 deg Eccentricity = 0.0532711705 Semimajor axis = 2.8683003508 AU Perihelion dist = 2.7155026338 AU Mag: H = 9.22, G = 0.15 Epoch of elements : MJD 60585.53469046 TDT (2024 Oct 02.5347) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,4.44,2024,10,2,12.832593,0.057604,-0.313669,4.503863,0.830885,0.005471,0.001021,0.000000,0.000000 93.8442,-20.2021,-15.19,-3.89,False UCAC4 349-179913,19.84678439,-20.2643606,12.83,11.97,11.51,0.1,4,,19.87100802,-20.2020706,2.61,2.62,0,0,0 158,Koronis,14.48,35.994,2.4677,0,0,1.140,2.96,,2.0,0 0,255.9330,2024,10,2,147.2455,277.6466,1.0057,0.05327,2.86830,2.71550,9.22,5.0,0.15 1.183,0.0140,0.0037,78,0.0037,Known errors,1.87,0,-1,-1 20241002_179913,60140.60 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org