IOTA/IOTA-ES occultation update for (109) Felicitas / UCAC4-294-184843 event on 2023 Mar 28, 20:00 UT Visible from Australia Summary ------- On 2023 Mar 28 UT, the 87.4 km diameter asteroid (109) Felicitas will occult a 12.3 mag star in the constellation Sagittarius 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 2.96 mag to 15.21 mag (the magnitude of the asteroid) for at most 6.600 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: 99 * date and approx. time of event: 2023 Mar 28, 19:52 - 2023 Mar 28, 20:08 * geocentric midpoint of event [JD]: 2460032.33387979 * magnitude of target star: 12.32 * magnitude drop [mag]: 2.96 * estimated maximum duration [s]: 6.600 * Moon: 47 % sunlit, 177° distance * Sun: 93° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 88 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.003", 85°) * approx speed of asteroid's shadow [km/s]: 13.2511 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-294-184843 by 109 Felicitas on 2023 Mar 28 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 72 0 0 .. .. .... .. .. .. .. .. .. 16 1 1 .. .. .. 15 54 22 .. .. .. .... 73 0 0 15 51 42 19 52 46.9 1 123 -69 15 23 24 16 20 0 15 16 44 16 26 40 .... 74 0 0 15 13 43 19 52 47.2 2 123 -69 14 45 21 15 42 5 14 38 40 15 48 46 0.05 75 0 0 14 35 18 19 52 47.6 3 124 -69 14 6 52 15 3 44 14 0 10 15 10 27 0.02 76 0 0 13 56 29 19 52 48.3 4 124 -69 13 28 0 14 25 0 13 21 16 14 31 43 0.00 77 0 0 13 17 17 19 52 49.1 6 124 -69 12 48 43 13 45 51 12 42 0 13 52 35 -0.01 78 0 0 12 37 42 19 52 50.2 7 124 -68 12 9 5 13 6 20 12 2 20 13 13 5 -0.01 79 0 0 11 57 46 19 52 51.5 8 125 -68 11 29 6 12 26 27 11 22 20 12 33 13 -0.02 80 0 0 11 17 30 19 52 52.9 9 125 -68 10 48 47 11 46 14 10 42 0 11 53 1 -0.02 81 0 0 10 36 55 19 52 54.6 10 125 -67 10 8 9 11 5 42 10 1 22 11 12 30 -0.02 82 0 0 9 56 2 19 52 56.6 12 125 -67 9 27 13 10 24 52 9 20 26 10 31 40 -0.03 83 0 0 9 14 53 19 52 58.7 13 125 -67 8 46 2 9 43 46 8 39 14 9 50 34 -0.03 84 0 0 8 33 29 19 53 1.0 14 125 -66 8 4 35 9 2 24 7 57 47 9 9 13 -0.03 85 0 0 7 51 52 19 53 3.6 15 126 -65 7 22 56 8 20 48 7 16 7 8 27 38 -0.03 86 0 0 7 10 2 19 53 6.4 16 126 -65 6 41 4 7 39 0 6 34 15 7 45 50 -0.03 87 0 0 6 28 1 19 53 9.4 18 126 -64 5 59 2 6 57 1 5 52 12 7 3 51 -0.03 88 0 0 5 45 51 19 53 12.6 19 126 -63 5 16 51 6 14 52 5 10 1 6 21 43 -0.03 89 0 0 5 3 34 19 53 16.1 20 126 -63 4 34 32 5 32 35 4 27 42 5 39 26 -0.03 90 0 0 4 21 10 19 53 19.7 21 126 -62 3 52 8 4 50 12 3 45 17 4 57 3 -0.03 91 0 0 3 38 42 19 53 23.6 23 126 -61 3 9 39 4 7 44 3 2 49 4 14 36 -0.04 92 0 0 2 56 10 19 53 27.7 24 126 -60 2 27 8 3 25 13 2 20 17 3 32 4 -0.04 93 0 0 2 13 38 19 53 32.0 25 126 -59 1 44 36 2 42 40 1 37 45 2 49 32 -0.04 94 0 0 1 31 5 19 53 36.5 26 126 -59 1 2 4 2 0 8 0 55 13 2 6 59 -0.04 95 0 0 0 48 35 19 53 41.2 28 126 -58 0 19 34 1 17 36 0 12 44 1 24 27 -0.04 96 0 0 0 6 8 19 53 46.1 29 126 -57 - 0 22 52 0 35 8 - 0 29 42 0 41 59 -0.04 97 0 0 - 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8 26.2 17 242 66 -19 11 30 -18 18 8 -19 17 47 -18 11 50 -0.04 -130 0 0 -18 15 4 20 8 28.8 16 242 67 -18 41 50 -17 48 17 -18 48 9 -17 41 58 -0.04 -129 0 0 -17 44 45 20 8 31.2 15 241 68 -18 11 37 -17 17 53 -18 17 56 -17 11 33 -0.04 -128 0 0 -17 13 53 20 8 33.5 14 241 69 -17 40 50 -16 46 55 -17 47 11 -16 40 34 -0.04 -127 0 0 -16 42 28 20 8 35.6 13 241 69 -17 9 31 -16 15 25 -17 15 53 -16 9 2 -0.04 -126 0 0 -16 10 31 20 8 37.6 12 240 70 -16 37 39 -15 43 23 -16 44 3 -15 36 59 -0.04 -125 0 0 -15 38 2 20 8 39.4 10 240 71 -16 5 15 -15 10 48 -16 11 40 -15 4 23 -0.03 -124 0 0 -15 5 2 20 8 41.0 9 240 72 -15 32 20 -14 37 43 -15 38 46 -14 31 16 -0.03 -123 0 0 -14 31 31 20 8 42.4 8 240 72 -14 58 54 -14 4 7 -15 5 22 -13 57 39 -0.03 -122 0 0 -13 57 30 20 8 43.7 7 239 73 -14 24 59 -13 30 1 -14 31 27 -13 23 32 -0.03 -121 0 0 -13 23 0 20 8 44.8 6 239 74 -13 50 33 -12 55 26 -13 57 3 -12 48 56 -0.02 -120 0 0 -12 48 1 20 8 45.7 5 239 74 -13 15 39 -12 20 22 -13 22 10 -12 13 51 -0.02 -119 0 0 -12 12 34 20 8 46.4 4 239 75 -12 40 17 -11 44 50 -12 46 49 -11 38 18 -0.01 -118 0 0 -11 36 40 20 8 46.9 3 238 75 -12 4 28 -11 8 52 -12 11 1 -11 2 18 0.01 -117 0 0 -11 0 20 20 8 47.3 1 238 75 -11 28 12 -10 32 27 -11 34 46 -10 25 53 0.06 -116 0 0 -10 23 35 20 8 47.4 0 238 76 -10 51 31 .. .. .. -10 58 6 .. .. .. 0.61 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4-294-184843 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 22 45.2615 DE: -31 23 04.808 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 22 45.2615 DE: -31 23 04.808 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (109) Felicitas asteroid class: approx. diameter [km]: 87 approx. diameter ["]: 0.037 distance from Earth [AU]: 3.23900 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2023 Feb 09 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): 0.009", 0.003", 84.701° remarks: * orbital elements for (109)Felicitas : Mean anomaly = 210.8617048265 deg Arg. of pericenter = 57.5900940847 deg Long. of node = 2.7578354546 deg Inclination = 7.8455631009 deg Eccentricity = 0.3000502351 Semimajor axis = 2.6938458218 AU Perihelion dist = 1.8855567498 AU Mag: H = 9.04, G = 0.04 Epoch of elements : MJD 60031.83388889 TDT (2023 Mar 28.8339) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Feb09,6.60,2023,3,28,20.013115,0.017168,0.060348,7.204563,-2.008585,-0.005889,-0.000209,0.000000,0.000000 149.8888,-31.3729,-118.93,3.13,False UCAC4-294-184843,18.37923929,-31.3846690,0.00,12.32,0.00,0.0,0,,18.40412616,-31.3729157,2.96,0.00,0,0,0 109,Felicitas,15.21,87.4,3.2390,0,0,1.528,-5.45,,5.6,0 0,210.6758,2023,3,28,57.5901,2.7578,7.8456,0.30005,2.69385,1.88556,9.08,5.0,0.15 1.118,0.0087,0.0033,85,0.0044,Known errors,-1.00,-1,-1,-1 20230328_184843,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org