IOTA/IOTA-ES occultation update for (144) Vibilia / UCAC4 517-005435 event on 2023 Aug 18, 10:12 UT Visible from South America Summary ------- On 2023 Aug 18 UT, the 146.1 km diameter asteroid (144) Vibilia will occult a 12.4 mag star in the constellation Aries 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 0.62 mag to 12.13 mag (the magnitude of the asteroid) for at most 8.470 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 18, 10:06 - 2023 Aug 18, 10:19 * geocentric midpoint of event [JD]: 2460174.92552554 * magnitude of target star: 12.41 * magnitude drop [mag]: 0.62 * estimated maximum duration [s]: 8.470 * Moon: 4 % sunlit, 117° distance * Sun: 94° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.000", 69°) * approx speed of asteroid's shadow [km/s]: 17.2535 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 517-005435 by 144 Vibilia on 2023 Aug 18 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 -152 0 0 -21 42 10 10 6 40.4 1 75 -81 -22 23 35 -21 0 50 -22 24 43 -20 59 42 .... -151 0 0 -21 27 21 10 6 40.5 2 75 -82 -22 8 48 -20 45 58 -22 9 57 -20 44 50 0.04 -150 0 0 -21 12 16 10 6 40.7 3 75 -82 -21 53 46 -20 30 51 -21 54 54 -20 29 42 0.08 -149 0 0 -20 56 56 10 6 41.0 4 74 -82 -21 38 28 -20 15 28 -21 39 37 -20 14 19 0.10 -148 0 0 -20 41 20 10 6 41.5 5 74 -82 -21 22 55 -19 59 50 -21 24 4 -19 58 41 0.11 -147 0 0 -20 25 30 10 6 42.0 5 73 -82 -21 7 7 -19 43 56 -21 8 16 -19 42 48 0.12 -146 0 0 -20 9 24 10 6 42.7 6 73 -82 -20 51 4 -19 27 49 -20 52 13 -19 26 40 0.12 -145 0 0 -19 53 4 10 6 43.5 7 73 -81 -20 34 47 -19 11 26 -20 35 56 -19 10 17 0.12 -144 0 0 -19 36 30 10 6 44.4 8 72 -81 -20 18 15 -18 54 49 -20 19 24 -18 53 41 0.13 -143 0 0 -19 19 42 10 6 45.3 9 72 -80 -20 1 29 -18 37 58 -20 2 38 -18 36 50 0.13 -142 0 0 -19 2 39 10 6 46.5 10 72 -80 -19 44 29 -18 20 54 -19 45 39 -18 19 45 0.13 -141 0 0 -18 45 23 10 6 47.7 11 71 -79 -19 27 16 -18 3 35 -19 28 25 -18 2 26 0.13 -140 0 0 -18 27 54 10 6 49.0 12 71 -78 -19 9 49 -17 46 3 -19 10 58 -17 44 54 0.13 -139 0 0 -18 10 11 10 6 50.5 13 71 -78 -18 52 9 -17 28 19 -18 53 18 -17 27 10 0.13 -138 0 0 -17 52 16 10 6 52.0 14 70 -77 -18 34 16 -17 10 21 -18 35 25 -17 9 12 0.13 -137 0 0 -17 34 8 10 6 53.7 15 70 -76 -18 16 10 -16 52 11 -18 17 20 -16 51 2 0.13 -136 0 0 -17 15 48 10 6 55.5 16 70 -75 -17 57 52 -16 33 49 -17 59 2 -16 32 39 0.13 -135 0 0 -16 57 16 10 6 57.4 17 70 -74 -17 39 22 -16 15 14 -17 40 32 -16 14 5 0.14 -134 0 0 -16 38 33 10 6 59.5 18 69 -73 -17 20 41 -15 56 29 -17 21 51 -15 55 19 0.14 -133 0 0 -16 19 38 10 7 1.6 19 69 -72 -17 1 48 -15 37 32 -17 2 58 -15 36 22 0.14 -132 0 0 -16 0 32 10 7 3.9 20 69 -72 -16 42 44 -15 18 24 -16 43 54 -15 17 15 0.14 -131 0 0 -15 41 15 10 7 6.3 21 68 -71 -16 23 30 -14 59 6 -16 24 40 -14 57 56 0.14 -130 0 0 -15 21 49 10 7 8.8 23 68 -70 -16 4 5 -14 39 37 -16 5 15 -14 38 28 0.14 -129 0 0 -15 2 12 10 7 11.4 24 68 -69 -15 44 30 -14 19 59 -15 45 40 -14 18 49 0.14 -128 0 0 -14 42 26 10 7 14.1 25 67 -68 -15 24 46 -14 0 11 -15 25 56 -13 59 2 0.14 -127 0 0 -14 22 31 10 7 17.0 26 67 -67 -15 4 53 -13 40 15 -15 6 3 -13 39 5 0.14 -126 0 0 -14 2 28 10 7 20.0 27 67 -66 -14 44 51 -13 20 10 -14 46 1 -13 19 0 0.14 -125 0 0 -13 42 16 10 7 23.1 28 67 -65 -14 24 40 -12 59 56 -14 25 50 -12 58 46 0.14 -124 0 0 -13 21 56 10 7 26.3 29 66 -64 -14 4 22 -12 39 35 -14 5 32 -12 38 25 0.14 -123 0 0 -13 1 29 10 7 29.6 30 66 -63 -13 43 56 -12 19 7 -13 45 6 -12 17 57 0.14 -122 0 0 -12 40 55 10 7 33.0 31 66 -62 -13 23 23 -11 58 31 -13 24 33 -11 57 22 0.14 -121 0 0 -12 20 14 10 7 36.6 32 65 -61 -13 2 44 -11 37 50 -13 3 54 -11 36 40 0.14 -120 0 0 -11 59 28 10 7 40.3 33 65 -60 -12 41 58 -11 17 2 -12 43 8 -11 15 52 0.14 -119 0 0 -11 38 35 10 7 44.0 34 65 -59 -12 21 7 -10 56 9 -12 22 17 -10 54 59 0.14 -118 0 0 -11 17 38 10 7 47.9 35 65 -58 -12 0 10 -10 35 11 -12 1 20 -10 34 1 0.14 -117 0 0 -10 56 36 10 7 51.9 36 64 -57 -11 39 9 -10 14 8 -11 40 19 -10 12 58 0.14 -116 0 0 -10 35 30 10 7 56.0 37 64 -56 -11 18 3 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 6.7 Data for the target star ------------------------ * name: UCAC4 517-005435 * constellation : Aries * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 18 52.8333 DE: +13 23 18.214 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 18 52.8335 DE: +13 23 18.215 * 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: (144) Vibilia asteroid class: approx. diameter [km]: 146 approx. diameter ["]: 0.119 distance from Earth [AU]: 1.69510 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#122 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): 0.013", 0.000", 69.163° remarks: * orbital elements for (144)Vibilia : Mean anomaly = 6.0871397266 deg Arg. of pericenter = 294.6609465559 deg Long. of node = 76.1663711038 deg Inclination = 4.8151061094 deg Eccentricity = 0.2359341346 Semimajor axis = 2.6549516688 AU Perihelion dist = 2.0285579444 AU Mag: H = 8.14, G = 0.17 Epoch of elements : MJD 60174.42555556 TDT (2023 Aug 18.4256) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1222023Jul30,8.47,2023,8,18,10.212613,0.035382,-0.147372,9.462994,2.299408,-0.005004,-0.001296,0.000000,0.000000 -69.6665,13.4750,27.80,13.11,False UCAC4 517-005435,3.31467588,13.3883927,0.00,12.41,0.00,0.0,0,,3.33633386,13.4750118,0.62,0.00,0,0,0 144,Vibilia,12.13,146.100,1.6951,0,0,3.365,11.93,,8.0,0 0,5.9902,2023,8,18,294.6609,76.1664,4.8151,0.23593,2.65495,2.02856,8.15,5.0,0.15 1.014,0.0130,0.0002,69,0.0130,Known errors,-1.00,0,-1,-1 20230818_005435,60162.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 06, 16:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org