IOTA/IOTA-ES occultation update for (146) Lucina / UCAC4 302-196029 event on 2023 Oct 13, 00:33 UT Visible from South America Summary ------- On 2023 Oct 13 UT, the 137.2 km diameter asteroid (146) Lucina will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.25 mag to 13.74 mag (the magnitude of the asteroid) for at most 5.180 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: 2023 Oct 13, 00:29 - 2023 Oct 13, 00:37 * geocentric midpoint of event [JD]: 2460230.52348987 * magnitude of target star: 11.64 * magnitude drop [mag]: 2.25 * estimated maximum duration [s]: 5.180 * Moon: 3 % sunlit, 92° distance * Sun: 73° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 144 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.000", 103°) * approx speed of asteroid's shadow [km/s]: 26.4743 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 302-196029 by 146 Lucina on 2023 Oct 13 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 164 0 0 16 54 16 0 30 0.3 0 121 65 16 8 49 .. .. .. 16 6 57 .. .. .. .... 165 0 0 16 19 17 0 30 0.3 1 121 66 15 33 52 17 4 56 15 32 1 17 6 49 -0.03 166 0 0 15 44 19 0 30 0.5 2 122 67 14 58 55 16 29 55 14 57 4 16 31 48 -0.16 167 0 0 15 9 20 0 30 0.7 4 122 67 14 23 59 15 54 54 14 22 8 15 56 47 -0.21 168 0 0 14 34 24 0 30 1.1 5 122 68 13 49 5 15 19 55 13 47 14 15 21 47 -0.24 169 0 0 13 59 30 0 30 1.5 6 123 68 13 14 15 14 44 59 13 12 24 14 46 51 -0.25 170 0 0 13 24 41 0 30 2.1 7 123 69 12 39 28 14 10 6 12 37 37 14 11 58 -0.26 171 0 0 12 49 56 0 30 2.7 8 123 70 12 4 47 13 35 18 12 2 56 13 37 10 -0.27 172 0 0 12 15 18 0 30 3.5 9 123 70 11 30 13 13 0 36 11 28 22 13 2 27 -0.27 173 0 0 11 40 47 0 30 4.3 10 123 70 10 55 46 12 26 1 10 53 55 12 27 52 -0.28 174 0 0 11 6 24 0 30 5.2 11 124 71 10 21 27 11 51 34 10 19 37 11 53 25 -0.28 175 0 0 10 32 11 0 30 6.3 13 124 71 9 47 18 11 17 16 9 45 28 11 19 7 -0.28 176 0 0 9 58 8 0 30 7.4 14 124 71 9 13 21 10 43 9 9 11 31 10 45 0 -0.29 177 0 0 9 24 17 0 30 8.7 15 124 71 8 39 34 10 9 13 8 37 45 10 11 4 -0.29 178 0 0 8 50 39 0 30 10.0 16 124 71 8 6 1 9 35 29 8 4 12 9 37 20 -0.29 179 0 0 8 17 14 0 30 11.4 17 125 71 7 32 42 9 1 59 7 30 52 9 3 49 -0.29 -180 0 0 7 44 4 0 30 12.9 18 125 71 6 59 37 8 28 43 6 57 48 8 30 33 -0.29 -179 0 0 7 11 9 0 30 14.6 19 125 71 6 26 48 7 55 43 6 24 59 7 57 33 -0.30 -178 0 0 6 38 31 0 30 16.3 20 125 71 5 54 16 7 22 59 5 52 27 7 24 48 -0.30 -177 0 0 6 6 11 0 30 18.1 22 125 70 5 22 1 6 50 32 5 20 13 6 52 21 -0.30 -176 0 0 5 34 8 0 30 20.0 23 125 70 4 50 5 6 18 23 4 48 17 6 20 13 -0.30 -175 0 0 5 2 25 0 30 21.9 24 126 70 4 18 28 5 46 34 4 16 40 5 48 23 -0.30 -174 0 0 4 31 2 0 30 24.0 25 126 69 3 47 11 5 15 4 3 45 24 5 16 53 -0.30 -173 0 0 3 59 59 0 30 26.2 26 126 69 3 16 15 4 43 55 3 14 28 4 45 44 -0.30 -172 0 0 3 29 19 0 30 28.4 27 126 68 2 45 41 4 13 8 2 43 54 4 14 56 -0.30 -171 0 0 2 59 0 0 30 30.7 28 126 67 2 15 30 3 42 43 2 13 43 3 44 30 -0.30 -170 0 0 2 29 5 0 30 33.1 29 126 67 1 45 41 3 12 41 1 43 55 3 14 28 -0.30 -169 0 0 1 59 34 0 30 35.6 31 127 66 1 16 17 2 43 2 1 14 31 2 44 49 -0.30 -168 0 0 1 30 27 0 30 38.1 32 127 65 0 47 17 2 13 48 0 45 31 2 15 35 -0.30 -167 0 0 1 1 45 0 30 40.8 33 127 64 0 18 42 1 44 59 0 16 56 1 46 46 -0.31 -166 0 0 0 33 29 0 30 43.5 34 127 64 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 302-196029 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 09 27.4026 DE: -29 42 00.446 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 09 27.4025 DE: -29 42 00.446 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (146) Lucina asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.069 distance from Earth [AU]: 2.74330 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#119 date of fit: 2023 Aug 22 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): 0.007", 0.000", 102.895° remarks: * orbital elements for (146)Lucina : Mean anomaly = 58.1569266992 deg Arg. of pericenter = 145.3320108269 deg Long. of node = 83.9304615273 deg Inclination = 13.0997875610 deg Eccentricity = 0.0660355342 Semimajor axis = 2.7177837781 AU Perihelion dist = 2.5383134745 AU Mag: H = 8.55, G = 0.11 Epoch of elements : MJD 60230.02347222 TDT (2023 Oct 13.0235) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192023Aug22,5.18,2023,10,13,0.563757,0.008901,0.305333,14.936058,-0.449476,0.005502,-0.000080,0.000000,0.000000 -117.0385,-29.6973,168.15,-7.60,False UCAC4 302-196029,18.15761186,-29.7001239,0.00,11.64,0.00,0.0,0,,18.18264978,-29.6973409,2.25,0.00,0,0,0 146,Lucina,13.74,137.200,2.7433,0,0,3.674,-1.44,,7.6,0 0,57.9318,2023,10,12,145.3320,83.9305,13.0998,0.06604,2.71778,2.53831,8.41,5.0,0.15 1.020,0.0070,0.0004,103,0.0070,Known errors,-1.00,0,-1,-1 20231013_196029,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org