IOTA/IOTA-ES occultation update for (187) Lamberta / TYC 7452-00272-1 event on 2023 Aug 15, 17:39 UT Visible from Australia, Africa Summary ------- On 2023 Aug 15 UT, the 134.6 km diameter asteroid (187) Lamberta will occult a 11.1 mag star in the constellation Sagittarius for observers along a path across Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.35 mag to 12.08 mag (the magnitude of the asteroid) for at most 16.900 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 Aug 15, 17:26 - 2023 Aug 15, 17:52 * geocentric midpoint of event [JD]: 2460172.23573154 * magnitude of target star: 11.10 * magnitude drop [mag]: 1.35 * estimated maximum duration [s]: 16.900 * Moon: 1 % sunlit, 158° distance * Sun: 149° distance * rough path description: Australia, Africa Additional comments ------------------- RUWE The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.000", 77°) * approx speed of asteroid's shadow [km/s]: 7.9623 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7452-00272-1 by 187 Lamberta on 2023 Aug 15 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 - 1 0 0 23 32 35 17 52 32.2 0 131 9 .. .. .. 22 43 0 .. .. .. 22 38 11 .... 0 0 0 22 44 13 17 52 31.9 2 131 8 23 34 6 21 54 32 23 38 59 21 49 43 -0.03 1 0 0 21 55 23 17 52 31.2 3 132 7 22 45 21 21 5 38 22 50 14 21 0 48 -0.12 2 0 0 21 6 8 17 52 30.2 4 132 6 21 56 10 20 16 20 22 1 3 20 11 30 -0.15 3 0 0 20 16 31 17 52 28.7 5 133 5 21 6 35 19 26 40 21 11 29 19 21 50 -0.17 4 0 0 19 26 33 17 52 26.9 7 133 4 20 16 39 18 36 40 20 21 33 18 31 49 -0.19 5 0 0 18 36 16 17 52 24.7 8 133 3 19 26 23 17 46 22 19 31 17 17 41 31 -0.19 6 0 0 17 45 43 17 52 22.1 9 134 1 18 35 51 16 55 48 18 40 45 16 50 57 -0.20 7 0 0 16 54 55 17 52 19.0 10 134 0 17 45 3 16 5 1 17 49 57 16 0 10 -0.20 8 0 0 16 3 56 17 52 15.6 12 134 -1 16 54 3 15 14 3 16 58 56 15 9 12 -0.21 9 0 0 15 12 47 17 52 11.8 13 134 -2 16 2 52 14 22 56 16 7 46 14 18 5 -0.21 10 0 0 14 21 31 17 52 7.5 14 135 -3 15 11 33 13 31 42 15 16 27 13 26 52 -0.21 11 0 0 13 30 10 17 52 2.9 15 135 -4 14 20 9 12 40 24 14 25 2 12 35 34 -0.22 12 0 0 12 38 46 17 51 57.8 17 135 -5 13 28 41 11 49 4 13 33 34 11 44 15 -0.22 13 0 0 11 47 22 17 51 52.4 18 135 -7 12 37 12 10 57 45 12 42 5 10 52 55 -0.22 14 0 0 10 56 0 17 51 46.6 19 136 -8 11 45 45 10 6 28 11 50 37 10 1 39 -0.22 15 0 0 10 4 42 17 51 40.4 21 136 -9 10 54 21 9 15 16 10 59 12 9 10 27 -0.22 16 0 0 9 13 30 17 51 33.8 22 136 -10 10 3 3 8 24 10 10 7 53 8 19 23 -0.22 17 0 0 8 22 27 17 51 26.8 23 136 -11 9 11 53 7 33 14 9 16 43 7 28 27 -0.22 18 0 0 7 31 35 17 51 19.5 24 136 -12 8 20 53 6 42 30 8 25 42 6 37 43 -0.22 19 0 0 6 40 55 17 51 11.8 26 137 -13 7 30 5 5 51 58 7 34 54 5 47 13 -0.22 20 0 0 5 50 31 17 51 3.8 27 137 -15 6 39 32 5 1 42 6 44 19 4 56 57 -0.22 21 0 0 5 0 23 17 50 55.4 28 137 -16 5 49 15 4 11 43 5 54 1 4 6 59 -0.22 22 0 0 4 10 33 17 50 46.7 29 137 -17 4 59 16 3 22 3 5 4 1 3 17 20 -0.22 23 0 0 3 21 4 17 50 37.7 31 137 -18 4 9 37 2 32 44 4 14 22 2 28 2 -0.22 24 0 0 2 31 58 17 50 28.3 32 137 -19 3 20 20 1 43 48 3 25 4 1 39 6 -0.22 25 0 0 1 43 15 17 50 18.7 33 138 -20 2 31 26 0 55 15 2 36 9 0 50 35 -0.22 26 0 0 0 54 57 17 50 8.8 34 138 -21 1 42 58 0 7 9 1 47 39 0 2 30 -0.22 27 0 0 0 7 7 17 49 58.6 36 138 -23 0 54 56 - 0 40 31 0 59 36 - 0 45 9 -0.22 28 0 0 - 0 40 15 17 49 48.2 37 138 -24 0 7 22 - 1 27 41 0 12 2 - 1 32 18 -0.22 29 0 0 - 1 27 8 17 49 37.5 38 138 -25 - 0 39 42 - 2 14 22 - 0 35 4 - 2 18 58 -0.22 30 0 0 - 2 13 29 17 49 26.6 39 138 -26 - 1 26 15 - 3 0 31 - 1 21 38 - 3 5 6 -0.22 31 0 0 - 2 59 18 17 49 15.5 41 138 -27 - 2 12 17 - 3 46 8 - 2 7 41 - 3 50 42 -0.22 32 0 0 - 3 44 34 17 49 4.1 42 138 -28 - 2 57 45 - 4 31 12 - 2 53 11 - 4 35 44 -0.22 33 0 0 - 4 29 15 17 48 52.5 43 139 -29 - 3 42 39 - 5 15 41 - 3 38 6 - 5 20 12 -0.22 34 0 0 - 5 13 22 17 48 40.8 44 139 -30 - 4 26 58 - 5 59 35 - 4 22 26 - 6 4 5 -0.22 35 0 0 - 5 56 52 17 48 28.9 45 139 -31 - 5 10 41 - 6 42 52 - 5 6 10 - 6 47 21 -0.22 36 0 0 - 6 39 45 17 48 16.8 46 139 -33 - 5 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55 1 -28 36 52 -29 58 38 -0.20 97 0 0 -29 21 41 17 35 29.0 69 242 -75 -28 44 25 -29 58 52 -28 40 47 -30 2 29 -0.20 98 0 0 -29 25 0 17 35 18.0 68 243 -75 -28 47 46 -30 2 9 -28 44 8 -30 5 46 -0.20 99 0 0 -29 27 46 17 35 7.0 68 244 -74 -28 50 33 -30 4 54 -28 46 55 -30 8 31 -0.20 100 0 0 -29 29 58 17 34 56.0 67 244 -74 -28 52 46 -30 7 6 -28 49 8 -30 10 42 -0.20 101 0 0 -29 31 37 17 34 45.1 66 244 -74 -28 54 26 -30 8 44 -28 50 48 -30 12 21 -0.20 102 0 0 -29 32 43 17 34 34.3 65 245 -74 -28 55 32 -30 9 49 -28 51 54 -30 13 26 -0.20 103 0 0 -29 33 16 17 34 23.6 65 245 -74 -28 56 5 -30 10 21 -28 52 27 -30 13 58 -0.20 104 0 0 -29 33 14 17 34 12.9 64 245 -73 -28 56 3 -30 10 21 -28 52 26 -30 13 57 -0.20 105 0 0 -29 32 40 17 34 2.3 63 246 -73 -28 55 29 -30 9 46 -28 51 51 -30 13 23 -0.20 106 0 0 -29 31 32 17 33 51.7 62 246 -73 -28 54 20 -30 8 39 -28 50 42 -30 12 16 -0.20 107 0 0 -29 29 51 17 33 41.2 62 246 -72 -28 52 38 -30 6 59 -28 49 0 -30 10 35 -0.20 108 0 0 -29 27 36 17 33 30.8 61 246 -72 -28 50 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29 42.1 41 242 -57 -25 0 8 -26 18 9 -24 56 20 -26 21 56 -0.21 133 0 0 -25 21 59 17 29 33.7 40 242 -56 -24 42 48 -26 1 4 -24 38 59 -26 4 53 -0.21 134 0 0 -25 4 8 17 29 25.3 39 242 -55 -24 24 48 -25 43 21 -24 20 58 -25 47 10 -0.21 135 0 0 -24 45 36 17 29 17.0 38 241 -54 -24 6 8 -25 24 58 -24 2 17 -25 28 48 -0.21 136 0 0 -24 26 24 17 29 8.9 37 241 -53 -23 46 47 -25 5 55 -23 42 55 -25 9 46 -0.22 137 0 0 -24 6 32 17 29 0.9 36 241 -53 -23 26 46 -24 46 11 -23 22 53 -24 50 3 -0.22 138 0 0 -23 45 58 17 28 53.0 35 240 -52 -23 6 3 -24 25 47 -23 2 9 -24 29 40 -0.22 139 0 0 -23 24 43 17 28 45.2 34 240 -51 -22 44 38 -24 4 42 -22 40 43 -24 8 35 -0.22 140 0 0 -23 2 46 17 28 37.6 33 240 -50 -22 22 31 -23 42 55 -22 18 35 -23 46 49 -0.22 141 0 0 -22 40 7 17 28 30.0 32 240 -49 -21 59 42 -23 20 26 -21 55 45 -23 24 21 -0.22 142 0 0 -22 16 45 17 28 22.7 31 239 -48 -21 36 9 -22 57 15 -21 32 12 -23 1 11 -0.22 143 0 0 -21 52 41 17 28 15.5 30 239 -48 -21 11 54 -22 33 21 -21 7 55 -22 37 18 -0.22 144 0 0 -21 27 53 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0 0 -15 31 43 17 26 57.8 17 235 -35 -14 48 11 -16 15 5 -14 43 56 -16 19 19 -0.23 157 0 0 -14 57 0 17 26 53.3 16 235 -34 -14 13 14 -15 40 37 -14 8 58 -15 44 51 -0.23 158 0 0 -14 21 30 17 26 49.1 15 235 -33 -13 37 30 -15 5 21 -13 33 12 -15 9 37 -0.23 159 0 0 -13 45 12 17 26 45.1 14 235 -32 -13 0 57 -14 29 18 -12 56 38 -14 33 35 -0.23 160 0 0 -13 8 7 17 26 41.5 12 235 -31 -12 23 38 -13 52 28 -12 19 17 -13 56 46 -0.23 161 0 0 -12 30 15 17 26 38.1 11 234 -30 -11 45 30 -13 14 50 -11 41 8 -13 19 10 -0.23 162 0 0 -11 51 35 17 26 35.0 10 234 -29 -11 6 35 -12 36 25 -11 2 11 -12 40 47 -0.23 163 0 0 -11 12 8 17 26 32.2 9 234 -28 -10 26 53 -11 57 13 -10 22 27 -12 1 36 -0.23 164 0 0 -10 31 53 17 26 29.8 8 234 -27 - 9 46 23 -11 17 13 - 9 41 56 -11 21 38 -0.23 165 0 0 - 9 50 52 17 26 27.6 7 234 -26 - 9 5 6 -10 36 27 - 9 0 38 -10 40 53 -0.23 166 0 0 - 9 9 4 17 26 25.8 5 233 -25 - 8 23 3 - 9 54 55 - 8 18 33 - 9 59 23 -0.23 167 0 0 - 8 26 31 17 26 24.4 4 233 -24 - 7 40 14 - 9 12 36 - 7 35 43 - 9 17 5 -0.23 168 0 0 - 7 43 11 17 26 23.3 3 233 -23 - 6 56 39 - 8 29 32 - 6 52 6 - 8 34 3 -0.23 169 0 0 - 6 59 7 17 26 22.5 2 233 -22 - 6 12 19 - 7 45 43 - 6 7 45 - 7 50 15 -0.22 170 0 0 - 6 14 18 17 26 22.2 1 233 -20 - 5 27 15 - 7 1 9 .. .. .. - 7 5 43 -0.18 Uncertainty in time = +/- 2 secs Prediction of 2023 Aug 6.7 Data for the target star ------------------------ * name: TYC 7452-00272-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 04 09.2720 DE: -36 58 12.762 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 04 09.2719 DE: -36 58 12.763 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (187) Lamberta asteroid class: ShapeModel approx. diameter [km]: 135 approx. diameter ["]: 0.115 distance from Earth [AU]: 1.62060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#114 date of fit: 2023 Jul 30 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): 0.011", 0.000", 77.25° remarks: * orbital elements for (187)Lamberta : Mean anomaly = 60.3396035325 deg Arg. of pericenter = 196.6911185412 deg Long. of node = 21.6725829648 deg Inclination = 10.5823457750 deg Eccentricity = 0.2404476303 Semimajor axis = 2.7279068173 AU Perihelion dist = 2.0719880875 AU Mag: H = 8.43, G = 0.15 Epoch of elements : MJD 60171.73548611 TDT (2023 Aug 15.7355) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1142023Jul30,16.90,2023,8,15,17.657557,0.063602,0.186849,-4.255451,1.445154,0.002144,0.001884,0.000001,0.000000 72.6963,-36.9040,-83.73,13.96,False TYC 7452-00272-1,20.06924223,-36.9702115,0.00,11.10,0.00,0.0,0,,20.09538888,-36.9039853,1.35,0.00,0,0,0 187,Lamberta,12.08,134.600,1.6206,0,0,-1.924,7.85,,6.8,0 0,60.1787,2023,8,15,196.6911,21.6726,10.5823,0.24045,2.72791,2.07199,8.29,5.0,0.15 1.049,0.0107,0.0003,77,0.0107,Known errors,-1.00,0,-1,-1 20230815_0272-1,60162.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 06, 16:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org