IOTA/IOTA-ES occultation update for (187) Lamberta / TYC 7469-01087-1 event on 2023 Jul 09, 16:20 UT Visible from Australia Summary ------- On 2023 Jul 09 UT, the 134.6 km diameter asteroid (187) Lamberta will occult a 11.7 mag star in the constellation Microscopium for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.76 mag to 11.73 mag (the magnitude of the asteroid) for at most 14.460 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 Jul 09, 16:09 - 2023 Jul 09, 16:32 * geocentric midpoint of event [JD]: 2460135.18125091 * magnitude of target star: 11.71 * magnitude drop [mag]: 0.76 * estimated maximum duration [s]: 14.460 * Moon: 55 % sunlit, 69° distance * Sun: 156° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 135 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.007", 61°) * approx speed of asteroid's shadow [km/s]: 9.3109 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7469-01087-1 by 187 Lamberta on 2023 Jul 9 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 35 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -14 33 45 .. .. .. -14 39 14 .... 36 0 0 -14 32 18 16 32 22.5 1 127 -17 -13 46 7 -15 18 23 -13 40 38 -15 23 51 .... 37 0 0 -15 16 24 16 32 22.0 2 127 -18 -14 30 27 -16 2 15 -14 25 0 -16 7 41 -0.01 38 0 0 -15 59 43 16 32 21.3 4 127 -19 -15 14 1 -16 45 20 -15 8 36 -16 50 44 -0.04 39 0 0 -16 42 16 16 32 20.2 5 127 -20 -15 56 49 -17 27 38 -15 51 25 -17 33 0 -0.06 40 0 0 -17 24 1 16 32 18.9 6 126 -22 -16 38 48 -18 9 8 -16 33 26 -18 14 29 -0.07 41 0 0 -18 4 58 16 32 17.3 7 126 -23 -17 20 0 -18 49 51 -17 14 40 -18 55 10 -0.08 42 0 0 -18 45 7 16 32 15.4 8 126 -24 -18 0 23 -19 29 45 -17 55 5 -19 35 2 -0.08 43 0 0 -19 24 27 16 32 13.3 9 125 -25 -18 39 58 -20 8 51 -18 34 42 -20 14 7 -0.08 44 0 0 -20 2 59 16 32 11.0 11 125 -26 -19 18 45 -20 47 9 -19 13 30 -20 52 23 -0.09 45 0 0 -20 40 43 16 32 8.4 12 125 -27 -19 56 44 -21 24 39 -19 51 30 -21 29 51 -0.09 46 0 0 -21 17 39 16 32 5.5 13 124 -28 -20 33 53 -22 1 20 -20 28 42 -22 6 30 -0.09 47 0 0 -21 53 46 16 32 2.5 14 124 -29 -21 10 15 -22 37 13 -21 5 5 -22 42 22 -0.09 48 0 0 -22 29 5 16 31 59.3 15 124 -30 -21 45 48 -23 12 18 -21 40 40 -23 17 25 -0.09 49 0 0 -23 3 36 16 31 55.8 16 123 -31 -22 20 33 -23 46 35 -22 15 26 -23 51 40 -0.09 50 0 0 -23 37 19 16 31 52.2 17 123 -32 -22 54 30 -24 20 4 -22 49 25 -24 25 8 -0.09 51 0 0 -24 10 14 16 31 48.3 18 123 -33 -23 27 39 -24 52 46 -23 22 36 -24 57 48 -0.09 52 0 0 -24 42 23 16 31 44.3 19 122 -34 -24 0 0 -25 24 41 -23 54 59 -25 29 42 -0.09 53 0 0 -25 13 44 16 31 40.1 20 122 -35 -24 31 35 -25 55 49 -24 26 35 -26 0 48 -0.09 54 0 0 -25 44 18 16 31 35.8 21 121 -36 -25 2 23 -26 26 11 -24 57 24 -26 31 8 -0.09 55 0 0 -26 14 7 16 31 31.3 22 121 -37 -25 32 24 -26 55 46 -25 27 27 -27 0 42 -0.09 56 0 0 -26 43 9 16 31 26.6 23 120 -38 -26 1 39 -27 24 36 -25 56 43 -27 29 30 -0.09 57 0 0 -27 11 26 16 31 21.8 24 120 -39 -26 30 8 -27 52 41 -26 25 14 -27 57 34 -0.09 58 0 0 -27 38 58 16 31 16.9 25 120 -40 -26 57 52 -28 20 0 -26 53 0 -28 24 52 -0.09 59 0 0 -28 5 45 16 31 11.8 26 119 -41 -27 24 51 -28 46 35 -27 20 0 -28 51 26 -0.09 60 0 0 -28 31 48 16 31 6.6 27 119 -42 -27 51 6 -29 12 27 -27 46 16 -29 17 16 -0.09 61 0 0 -28 57 7 16 31 1.3 28 118 -42 -28 16 37 -29 37 34 -28 11 48 -29 42 22 -0.09 62 0 0 -29 21 43 16 30 55.9 29 118 -43 -28 41 24 -30 1 59 -28 36 37 -30 6 45 -0.09 63 0 0 -29 45 36 16 30 50.3 30 117 -44 -29 5 28 -30 25 41 -29 0 42 -30 30 26 -0.09 64 0 0 -30 8 46 16 30 44.6 31 117 -45 -29 28 49 -30 48 41 -29 24 5 -30 53 25 -0.09 65 0 0 -30 31 15 16 30 38.9 32 116 -46 -29 51 28 -31 10 59 -29 46 45 -31 15 42 -0.09 66 0 0 -30 53 2 16 30 33.0 33 116 -47 -30 13 25 -31 32 36 -30 8 43 -31 37 17 -0.09 67 0 0 -31 14 8 16 30 27.0 34 116 -48 -30 34 41 -31 53 32 -30 30 1 -31 58 12 -0.09 68 0 0 -31 34 34 16 30 21.0 35 115 -48 -30 55 16 -32 13 48 -30 50 37 -32 18 27 -0.09 69 0 0 -31 54 19 16 30 14.8 35 115 -49 -31 15 11 -32 33 24 -31 10 33 -32 38 2 -0.09 70 0 0 -32 13 25 16 30 8.6 36 114 -50 -31 34 26 -32 52 21 -31 29 48 -32 56 57 -0.09 71 0 0 -32 31 51 16 30 2.3 37 114 -51 -31 53 1 -33 10 38 -31 48 25 -33 15 14 -0.09 72 0 0 -32 49 39 16 29 55.9 38 113 -52 -32 10 57 -33 28 17 -32 6 22 -33 32 52 -0.09 73 0 0 -33 6 48 16 29 49.4 39 113 -52 -32 28 15 -33 45 18 -32 23 40 -33 49 52 -0.09 74 0 0 -33 23 19 16 29 42.9 40 112 -53 -32 44 54 -34 1 41 -32 40 21 -34 6 14 -0.09 75 0 0 -33 39 13 16 29 36.3 41 112 -54 -33 0 55 -34 17 27 -32 56 23 -34 21 59 -0.09 76 0 0 -33 54 29 16 29 29.6 41 111 -55 -33 16 19 -34 32 36 -33 11 48 -34 37 7 -0.09 77 0 0 -34 9 9 16 29 22.8 42 111 -56 -33 31 6 -34 47 9 -33 26 35 -34 51 39 -0.09 78 0 0 -34 23 12 16 29 16.0 43 110 -56 -33 45 16 -35 1 5 -33 40 46 -35 5 34 -0.09 79 0 0 -34 36 39 16 29 9.1 44 110 -57 -33 58 50 -35 14 25 -33 54 21 -35 18 54 -0.09 80 0 0 -34 49 30 16 29 2.2 45 109 -58 -34 11 48 -35 27 10 -34 7 19 -35 31 38 -0.09 81 0 0 -35 1 46 16 28 55.2 46 109 -58 -34 24 10 -35 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39 0.02 -145 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 20 30 55 .. .. .. 20 25 18 .... Uncertainty in time = +/- 2 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: TYC 7469-01087-1 * constellation : Microscopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 42 02.4015 DE: -36 28 17.647 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 42 02.4016 DE: -36 28 17.648 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * 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 ["]: 0.125 distance from Earth [AU]: 1.48270 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#113 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): 0.021", 0.007", 61.236° remarks: * orbital elements for (187)Lamberta : Mean anomaly = 52.2282954839 deg Arg. of pericenter = 196.6943898546 deg Long. of node = 21.6725463797 deg Inclination = 10.5823463710 deg Eccentricity = 0.2404742255 Semimajor axis = 2.7279883861 AU Perihelion dist = 2.0719774917 AU Mag: H = 8.30, G = 0.15 Epoch of elements : MJD 60134.68097222 TDT (2023 Jul 09.6810) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132023Apr24,14.46,2023,7,9,16.350022,-0.029936,0.074629,-4.880153,-1.950026,-0.001924,0.001082,0.000001,0.000000 138.2909,-36.3864,-63.93,22.33,False TYC 7469-01087-1,20.70066707,-36.4715686,0.00,11.71,0.00,0.0,0,,20.72596106,-36.3864213,0.76,0.00,0,0,0 187,Lamberta,11.73,134.6,1.4827,0,0,-2.397,-11.56,,6.8,0 0,52.0793,2023,7,9,196.6944,21.6725,10.5823,0.24047,2.72799,2.07198,8.30,5.0,0.15 1.059,0.0213,0.0070,61,0.0074,Known errors,-1.00,-1,-1,-1 20230709_1087-1,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org