IOTA/IOTA-ES occultation update for (109) Felicitas / TYC 7401-00029-1 event on 2023 May 29, 15:33 UT Visible from S Australia Summary ------- On 2023 May 29 UT, the 87.4 km diameter asteroid (109) Felicitas will occult a 10.4 mag star in the constellation Sagittarius for observers along a path across S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.82 mag to 14.21 mag (the magnitude of the asteroid) for at most 7.060 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 May 29, 15:24 - 2023 May 29, 15:42 * geocentric midpoint of event [JD]: 2460094.14812516 * magnitude of target star: 10.42 * magnitude drop [mag]: 3.82 * estimated maximum duration [s]: 7.060 * Moon: 70 % sunlit, 94° distance * Sun: 152° distance * rough path description: S Australia The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.005", 85°) * approx speed of asteroid's shadow [km/s]: 12.3798 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7401-00029-1 by 109 Felicitas on 2023 May 29 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 55 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -11 29 49 .. .. .. -11 35 36 .... 56 0 0 -11 42 4 15 41 52.6 1 125 -25 -11 13 14 -12 10 55 -11 7 28 -12 16 40 .... 57 0 0 -12 22 47 15 41 52.3 2 125 -26 -11 54 2 -12 51 32 -11 48 17 -12 57 16 0.06 58 0 0 -13 3 1 15 41 51.7 3 124 -27 -12 34 21 -13 31 41 -12 28 38 -13 37 25 0.03 59 0 0 -13 42 46 15 41 51.0 5 124 -28 -13 14 11 -14 11 21 -13 8 29 -14 17 3 0.02 60 0 0 -14 22 1 15 41 50.0 6 124 -29 -13 53 32 -14 50 30 -13 47 51 -14 56 12 0.01 61 0 0 -15 0 45 15 41 48.9 7 124 -30 -14 32 21 -15 29 9 -14 26 41 -15 34 49 0.00 62 0 0 -15 38 58 15 41 47.5 8 123 -31 -15 10 39 -16 7 15 -15 5 0 -16 12 54 0.00 63 0 0 -16 16 37 15 41 46.0 9 123 -32 -15 48 25 -16 44 49 -15 42 47 -16 50 27 0.00 64 0 0 -16 53 44 15 41 44.2 10 123 -34 -16 25 37 -17 21 50 -16 20 1 -17 27 27 -0.01 65 0 0 -17 30 17 15 41 42.3 11 122 -35 -17 2 16 -17 58 17 -16 56 41 -18 3 52 -0.01 66 0 0 -18 6 16 15 41 40.2 13 122 -36 -17 38 21 -18 34 10 -17 32 47 -18 39 44 -0.01 67 0 0 -18 41 40 15 41 37.9 14 122 -37 -18 13 51 -19 9 28 -18 8 18 -19 15 1 -0.01 68 0 0 -19 16 29 15 41 35.5 15 122 -38 -18 48 47 -19 44 11 -18 43 15 -19 49 42 -0.01 69 0 0 -19 50 42 15 41 32.9 16 121 -39 -19 23 6 -20 18 18 -19 17 36 -20 23 48 -0.01 70 0 0 -20 24 20 15 41 30.1 17 121 -40 -19 56 50 -20 51 49 -19 51 21 -20 57 19 -0.01 71 0 0 -20 57 22 15 41 27.2 18 121 -41 -20 29 58 -21 24 45 -20 24 30 -21 30 13 -0.01 72 0 0 -21 29 47 15 41 24.1 19 120 -42 -21 2 29 -21 57 4 -20 57 3 -22 2 30 -0.01 73 0 0 -22 1 35 15 41 20.9 20 120 -43 -21 34 24 -22 28 46 -21 28 59 -22 34 12 -0.01 74 0 0 -22 32 47 15 41 17.6 21 119 -44 -22 5 43 -22 59 52 -22 0 18 -23 5 16 -0.01 75 0 0 -23 3 23 15 41 14.1 22 119 -45 -22 36 24 -23 30 21 -22 31 1 -23 35 44 -0.01 76 0 0 -23 33 21 15 41 10.5 23 119 -46 -23 6 29 -24 0 13 -23 1 7 -24 5 35 -0.01 77 0 0 -24 2 42 15 41 6.7 24 118 -47 -23 35 56 -24 29 28 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16 - 2 49 49 - 1 45 25 - 2 55 39 -0.02 -139 0 0 - 1 36 49 15 25 20.2 22 233 2 - 1 7 31 - 2 6 7 - 1 1 40 - 2 11 57 -0.02 -138 0 0 - 0 52 59 15 25 16.2 21 233 3 - 0 23 40 - 1 22 18 - 0 17 49 - 1 28 9 -0.02 -137 0 0 - 0 9 5 15 25 12.4 20 233 5 0 20 16 - 0 38 24 0 26 7 - 0 44 15 -0.02 -136 0 0 0 34 53 15 25 8.8 18 233 6 1 4 14 0 5 33 1 10 6 - 0 0 18 -0.02 -135 0 0 1 18 53 15 25 5.4 17 233 7 1 48 14 0 49 32 1 54 6 0 43 41 -0.02 -134 0 0 2 2 52 15 25 2.3 16 234 8 2 32 14 1 33 32 2 38 5 1 27 40 -0.02 -133 0 0 2 46 50 15 24 59.3 15 234 9 3 16 11 2 17 30 3 22 3 2 11 39 -0.01 -132 0 0 3 30 45 15 24 56.7 14 234 10 4 0 6 3 1 25 4 5 57 2 55 34 -0.01 -131 0 0 4 14 35 15 24 54.2 12 234 12 4 43 55 3 45 16 4 49 46 3 39 25 -0.01 -130 0 0 4 58 19 15 24 52.0 11 234 13 5 27 37 4 29 0 5 33 28 4 23 10 -0.01 -129 0 0 5 41 54 15 24 50.0 10 234 14 6 11 11 5 12 37 6 17 2 5 6 47 -0.01 -128 0 0 6 25 20 15 24 48.2 9 234 15 6 54 35 5 56 5 7 0 26 5 50 14 -0.01 -127 0 0 7 8 34 15 24 46.7 7 234 16 7 37 48 6 39 21 7 43 38 6 33 31 0.00 -126 0 0 7 51 36 15 24 45.4 6 234 18 8 20 47 7 22 25 8 26 37 7 16 35 0.00 -125 0 0 8 34 23 15 24 44.3 5 234 19 9 3 32 8 5 15 9 9 21 7 59 26 0.01 -124 0 0 9 16 55 15 24 43.5 4 234 20 9 46 1 8 47 49 9 51 50 8 42 1 0.02 -123 0 0 9 59 9 15 24 42.9 3 235 21 10 28 13 9 30 6 10 34 1 9 24 19 0.04 -122 0 0 10 41 5 15 24 42.6 1 235 22 11 10 5 10 12 5 11 15 52 10 6 18 0.10 -121 0 0 11 22 40 15 24 42.4 0 235 23 .. .. .. 10 53 44 .. .. .. 10 47 58 0.97 Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 7401-00029-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 18 44.4172 DE: -34 10 35.572 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 18 44.4175 DE: -34 10 35.573 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (109) Felicitas asteroid class: approx. diameter [km]: 87 approx. diameter ["]: 0.050 distance from Earth [AU]: 2.43010 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.012", 0.005", 85.263° remarks: * orbital elements for (109)Felicitas : Mean anomaly = 224.6356734879 deg Arg. of pericenter = 57.5971163352 deg Long. of node = 2.7561972391 deg Inclination = 7.8455191477 deg Eccentricity = 0.3000960094 Semimajor axis = 2.6937300203 AU Perihelion dist = 1.8853523908 AU Mag: H = 9.03, G = 0.04 Epoch of elements : MJD 60093.64798611 TDT (2023 May 29.6480) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,7.06,2023,5,29,15.555004,-0.001780,0.003729,-6.792000,-1.641247,-0.002523,0.000868,0.000001,0.000000 154.8475,-34.1670,-53.96,21.65,False TYC 7401-00029-1,18.31233810,-34.1765476,0.00,10.42,0.00,0.0,0,,18.33840004,-34.1669647,3.82,0.00,0,0,0 109,Felicitas,14.21,87.4,2.4301,0,0,-1.981,-5.94,,5.6,0 0,224.4912,2023,5,29,57.5971,2.7562,7.8455,0.30010,2.69373,1.88535,9.08,5.0,0.15 1.100,0.0117,0.0047,85,0.0049,Known errors,-1.00,-1,-1,-1 20230529_0029-1,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org