IOTA/IOTA-ES occultation update for (39) Laetitia / UCAC4-376-083981 event on 2023 Oct 01, 22:19 UT Visible from South America Summary ------- On 2023 Oct 01 UT, the 158 km diameter asteroid (39) Laetitia will occult a 12.4 mag star in the constellation Serpens 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 0.47 mag to 11.71 mag (the magnitude of the asteroid) for at most 6.040 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 01, 22:15 - 2023 Oct 01, 22:23 * geocentric midpoint of event [JD]: 2460219.43004854 * magnitude of target star: 12.38 * magnitude drop [mag]: 0.47 * estimated maximum duration [s]: 6.040 * Moon: 91 % sunlit, 141° distance * Sun: 73° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 160 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 97°) * approx speed of asteroid's shadow [km/s]: 26.1456 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-376-083981 by 39 Laetitia on 2023 Oct 1 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 -167 0 0 22 7 32 22 15 14.9 0 106 63 21 22 33 .. .. .. 21 19 20 .. .. .. .... -166 0 0 21 51 7 22 15 15.0 1 107 63 21 6 5 22 36 15 21 2 52 22 39 28 0.01 -165 0 0 21 34 26 22 15 15.1 2 107 64 20 49 20 22 19 36 20 46 7 22 22 50 -0.06 -164 0 0 21 17 27 22 15 15.3 3 107 64 20 32 18 22 2 41 20 29 5 22 5 55 -0.08 -163 0 0 21 0 12 22 15 15.5 4 108 65 20 15 0 21 45 29 20 11 46 21 48 44 -0.10 -162 0 0 20 42 41 22 15 15.9 5 108 65 19 57 25 21 28 1 19 54 11 21 31 16 -0.10 -161 0 0 20 24 53 22 15 16.3 6 108 66 19 39 34 21 10 17 19 36 20 21 13 32 -0.11 -160 0 0 20 6 50 22 15 16.7 7 109 66 19 21 28 20 52 17 19 18 13 20 55 32 -0.11 -159 0 0 19 48 31 22 15 17.3 8 109 67 19 3 5 20 34 1 18 59 51 20 37 16 -0.12 -158 0 0 19 29 56 22 15 17.9 9 109 67 18 44 28 20 15 30 18 41 13 20 18 45 -0.12 -157 0 0 19 11 7 22 15 18.6 10 110 68 18 25 35 19 56 43 18 22 20 19 59 59 -0.12 -156 0 0 18 52 2 22 15 19.4 11 110 68 18 6 28 19 37 42 18 3 13 19 40 58 -0.12 -155 0 0 18 32 44 22 15 20.3 12 110 68 17 47 6 19 18 26 17 43 51 19 21 43 -0.12 -154 0 0 18 13 11 22 15 21.2 13 111 68 17 27 30 18 58 56 17 24 15 19 2 13 -0.12 -153 0 0 17 53 24 22 15 22.2 14 111 69 17 7 40 18 39 12 17 4 25 18 42 29 -0.13 -152 0 0 17 33 23 22 15 23.3 15 111 69 16 47 37 18 19 15 16 44 21 18 22 32 -0.13 -151 0 0 17 13 10 22 15 24.5 16 112 69 16 27 21 17 59 4 16 24 5 18 2 21 -0.13 -150 0 0 16 52 43 22 15 25.7 17 112 69 16 6 52 17 38 40 16 3 35 17 41 57 -0.13 -149 0 0 16 32 4 22 15 27.1 18 112 69 15 46 10 17 18 4 15 42 54 17 21 21 -0.13 -148 0 0 16 11 13 22 15 28.5 19 113 69 15 25 17 16 57 15 15 22 0 17 0 33 -0.13 -147 0 0 15 50 11 22 15 29.9 20 113 69 15 4 12 16 36 15 15 0 55 16 39 33 -0.13 -146 0 0 15 28 57 22 15 31.5 21 113 69 14 42 55 16 15 3 14 39 38 16 18 21 -0.13 -145 0 0 15 7 32 22 15 33.1 22 113 68 14 21 28 15 53 41 14 18 11 15 56 59 -0.13 -144 0 0 14 45 56 22 15 34.9 23 114 68 13 59 50 15 32 7 13 56 33 15 35 26 -0.13 -143 0 0 14 24 11 22 15 36.7 24 114 68 13 38 3 15 10 24 13 34 46 15 13 42 -0.13 -142 0 0 14 2 16 22 15 38.5 25 114 67 13 16 6 14 48 31 13 12 48 14 51 50 -0.13 -141 0 0 13 40 12 22 15 40.5 26 115 67 12 54 0 14 26 29 12 50 42 14 29 47 -0.13 -140 0 0 13 17 59 22 15 42.5 27 115 67 12 31 46 14 4 18 12 28 28 14 7 37 -0.13 -139 0 0 12 55 38 22 15 44.6 28 115 66 12 9 23 13 41 59 12 6 5 13 45 17 -0.13 -138 0 0 12 33 10 22 15 46.8 29 115 66 11 46 53 13 19 32 11 43 35 13 22 51 -0.13 -137 0 0 12 10 34 22 15 49.1 31 116 65 11 24 16 12 56 57 11 20 58 13 0 16 -0.13 -136 0 0 11 47 52 22 15 51.5 32 116 65 11 1 33 12 34 16 10 58 14 12 37 35 -0.13 -135 0 0 11 25 3 22 15 53.9 33 116 64 10 38 43 12 11 29 10 35 25 12 14 48 -0.13 -134 0 0 11 2 9 22 15 56.4 34 116 63 10 15 48 11 48 36 10 12 30 11 51 55 -0.13 -133 0 0 10 39 10 22 15 58.9 35 117 63 9 52 48 11 25 37 9 49 29 11 28 57 -0.13 -132 0 0 10 16 6 22 16 1.6 36 117 62 9 29 44 11 2 34 9 26 25 11 5 54 -0.13 -131 0 0 9 52 59 22 16 4.3 37 117 61 9 6 35 10 39 27 9 3 17 10 42 47 -0.13 -130 0 0 9 29 47 22 16 7.1 38 117 61 8 43 24 10 16 17 8 40 5 10 19 36 -0.13 -129 0 0 9 6 33 22 16 10.0 39 118 60 8 20 9 9 53 3 8 16 50 9 56 22 -0.13 -128 0 0 8 43 17 22 16 12.9 40 118 59 7 56 53 9 29 47 7 53 34 9 33 6 -0.13 -127 0 0 8 19 59 22 16 15.9 41 118 58 7 33 34 9 6 29 7 30 16 9 9 48 -0.13 -126 0 0 7 56 40 22 16 19.0 42 119 57 7 10 15 8 43 9 7 6 57 8 46 29 -0.13 -125 0 0 7 33 20 22 16 22.1 43 119 57 6 46 56 8 19 49 6 43 37 8 23 9 -0.14 -124 0 0 7 10 0 22 16 25.3 44 119 56 6 23 36 7 56 29 6 20 17 7 59 49 -0.14 -123 0 0 6 46 40 22 16 28.6 45 119 55 6 0 17 7 33 9 5 56 58 7 36 29 -0.14 -122 0 0 6 23 22 22 16 31.9 46 120 54 5 36 59 7 9 51 5 33 41 7 13 10 -0.14 -121 0 0 6 0 6 22 16 35.3 48 120 53 5 13 44 6 46 33 5 10 25 6 49 53 -0.14 -120 0 0 5 36 51 22 16 38.8 49 120 52 4 50 30 6 23 18 4 47 12 6 26 38 -0.14 -119 0 0 5 13 40 22 16 42.3 50 121 51 4 27 20 6 0 6 4 24 2 6 3 25 -0.14 -118 0 0 4 50 32 22 16 45.9 51 121 50 4 4 13 5 36 57 4 0 55 5 40 16 -0.14 -117 0 0 4 27 28 22 16 49.5 52 121 49 3 41 11 5 13 52 3 37 52 5 17 11 -0.14 -116 0 0 4 4 29 22 16 53.2 53 121 49 3 18 13 4 50 51 3 14 55 4 54 10 -0.14 -115 0 0 3 41 35 22 16 56.9 54 122 48 2 55 20 4 27 55 2 52 2 4 31 14 -0.14 -114 0 0 3 18 47 22 17 0.7 55 122 47 2 32 33 4 5 5 2 29 15 4 8 24 -0.14 -113 0 0 2 56 5 22 17 4.5 56 123 46 2 9 53 3 42 22 2 6 35 3 45 40 -0.14 -112 0 0 2 33 29 22 17 8.4 57 123 45 1 47 20 3 19 45 1 44 2 3 23 3 -0.14 -111 0 0 2 11 1 22 17 12.4 58 123 44 1 24 54 2 57 15 1 21 36 3 0 33 -0.14 -110 0 0 1 48 42 22 17 16.3 59 124 43 1 2 36 2 34 53 0 59 19 2 38 11 -0.14 -109 0 0 1 26 30 22 17 20.3 60 124 42 0 40 27 2 12 39 0 37 9 2 15 57 -0.14 -108 0 0 1 4 28 22 17 24.4 61 125 41 0 18 26 1 50 34 0 15 9 1 53 52 -0.14 -107 0 0 0 42 35 22 17 28.5 62 125 40 - 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10 0 0 -10 0 55 22 23 7.5 17 257 -56 -10 44 52 - 9 16 53 -10 48 0 - 9 13 44 -0.14 - 9 0 0 - 9 49 50 22 23 8.7 16 257 -57 -10 33 50 - 9 5 45 -10 36 58 - 9 2 36 -0.14 - 8 0 0 - 9 38 25 22 23 9.8 15 257 -58 -10 22 27 - 8 54 17 -10 25 36 - 8 51 8 -0.14 - 7 0 0 - 9 26 39 22 23 10.9 14 257 -59 -10 10 44 - 8 42 28 -10 13 53 - 8 39 19 -0.14 - 6 0 0 - 9 14 32 22 23 11.9 13 257 -60 - 9 58 40 - 8 30 19 -10 1 49 - 8 27 9 -0.14 - 5 0 0 - 9 2 6 22 23 12.8 12 256 -61 - 9 46 17 - 8 17 50 - 9 49 26 - 8 14 40 -0.14 - 4 0 0 - 8 49 19 22 23 13.6 10 256 -62 - 9 33 33 - 8 5 0 - 9 36 43 - 8 1 50 -0.14 - 3 0 0 - 8 36 13 22 23 14.4 9 256 -63 - 9 20 30 - 7 51 51 - 9 23 40 - 7 48 41 -0.14 - 2 0 0 - 8 22 47 22 23 15.0 8 256 -64 - 9 7 7 - 7 38 22 - 9 10 17 - 7 35 11 -0.14 - 1 0 0 - 8 9 2 22 23 15.6 7 256 -65 - 8 53 25 - 7 24 34 - 8 56 35 - 7 21 23 -0.14 - 0 0 0 - 7 54 57 22 23 16.2 6 256 -66 - 8 39 23 - 7 10 26 - 8 42 34 - 7 7 15 -0.14 1 0 0 - 7 40 34 22 23 16.6 5 256 -67 - 8 25 3 - 6 55 59 - 8 28 13 - 6 52 48 -0.14 2 0 0 - 7 25 51 22 23 17.0 4 255 -68 - 8 10 24 - 6 41 14 - 8 13 34 - 6 38 2 -0.14 3 0 0 - 7 10 50 22 23 17.3 3 255 -69 - 7 55 26 - 6 26 9 - 7 58 37 - 6 22 58 -0.13 4 0 0 - 6 55 31 22 23 17.5 2 255 -70 - 7 40 9 - 6 10 47 - 7 43 21 - 6 7 35 -0.13 5 0 0 - 6 39 53 22 23 17.7 1 255 -71 - 7 24 35 - 5 55 6 - 7 27 47 - 5 51 54 -0.12 6 0 0 - 6 23 58 22 23 17.7 0 255 -72 - 7 8 43 - 5 39 7 - 7 11 55 - 5 35 55 -0.06 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4-376-083981 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 21 50.6550 DE: -14 56 34.631 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 21 50.6550 DE: -14 56 34.631 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (39) Laetitia asteroid class: approx. diameter [km]: 158 approx. diameter ["]: 0.077 distance from Earth [AU]: 2.83410 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#125 date of fit: 2023 Aug 23 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", 0.002", 97.173° remarks: * orbital elements for (39)Laetitia : Mean anomaly = 287.0535439280 deg Arg. of pericenter = 209.8276261220 deg Long. of node = 156.9302105684 deg Inclination = 10.3705834178 deg Eccentricity = 0.1119789008 Semimajor axis = 2.7686879089 AU Perihelion dist = 2.4586532804 AU Mag: H = 5.97, G = 0.15 Epoch of elements : MJD 60218.93000000 TDT (2023 Oct 01.9300) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1252023Aug23,6.04,2023,10,1,22.321165,0.035711,0.137617,14.275477,-3.740112,0.005427,-0.000110,0.000000,0.000000 -84.4092,-14.9659,-157.41,-3.36,False UCAC4-376-083981,17.36407087,-14.9429530,0.00,12.38,0.00,0.0,0,,17.38640028,-14.9658658,0.47,0.00,0,0,0 39,Laetitia,11.71,158.000,2.8341,0,0,3.057,-11.60,,8.2,0 0,286.8546,2023,10,1,209.8276,156.9302,10.3706,0.11198,2.76869,2.45865,6.26,5.0,0.15 1.036,0.0140,0.0021,97,0.0142,Known errors,-1.00,0,-1,-1 20231001_083981,60183.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org