IOTA/IOTA-ES occultation update for (196) Philomela / UCAC4 307-177851 event on 2023 Aug 02, 01:52 UT Visible from Africa, South America Summary ------- On 2023 Aug 02 UT, the 140.1 km diameter asteroid (196) Philomela will occult a 11.0 mag star in the constellation Sagittarius for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.02 mag to 11.49 mag (the magnitude of the asteroid) for at most 21.770 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 Aug 02, 01:37 - 2023 Aug 02, 02:08 * geocentric midpoint of event [JD]: 2460158.57846454 * magnitude of target star: 11.01 * magnitude drop [mag]: 1.02 * estimated maximum duration [s]: 21.770 * Moon: 100 % sunlit, 41° distance * Sun: 142° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 154 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 7.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.032, +/- 0.019) * 1 sigma uncertainty ellipse (major, minor, PA): (0.032", 0.019", 97°) * approx speed of asteroid's shadow [km/s]: 6.4354 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 307-177851 by 196 Philomela on 2023 Aug 2 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 -151 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 15 53 21 .. .. .. 15 31 47 .... -150 0 0 16 8 47 2 8 1.4 1 120 32 16 57 48 15 20 9 17 19 43 14 58 38 .... -149 0 0 15 35 43 2 8 0.8 2 121 31 16 24 36 14 47 13 16 46 28 14 25 46 -0.28 -148 0 0 15 2 56 2 7 59.8 3 121 30 15 51 41 14 14 35 16 13 29 13 53 11 -0.35 -147 0 0 14 30 28 2 7 58.5 4 121 29 15 19 3 13 42 14 15 40 48 13 20 55 -0.39 -146 0 0 13 58 17 2 7 56.7 5 121 28 14 46 45 13 10 13 15 8 25 12 48 57 -0.41 -145 0 0 13 26 27 2 7 54.5 7 122 27 14 14 45 12 38 31 14 36 21 12 17 19 -0.42 -144 0 0 12 54 57 2 7 51.9 8 122 26 13 43 6 12 7 9 14 4 38 11 46 1 -0.43 -143 0 0 12 23 47 2 7 49.0 9 122 25 13 11 48 11 36 9 13 33 16 11 15 4 -0.44 -142 0 0 11 53 0 2 7 45.7 10 122 24 12 40 51 11 5 30 13 2 15 10 44 30 -0.45 -141 0 0 11 22 35 2 7 41.9 11 122 23 12 10 17 10 35 14 12 31 37 10 14 17 -0.45 -140 0 0 10 52 33 2 7 37.9 12 123 22 11 40 6 10 5 21 12 1 21 9 44 28 -0.45 -139 0 0 10 22 54 2 7 33.4 13 123 21 11 10 18 9 35 51 11 31 29 9 15 3 -0.46 -138 0 0 9 53 40 2 7 28.6 14 123 20 10 40 54 9 6 46 11 2 2 8 46 1 -0.46 -137 0 0 9 24 50 2 7 23.4 15 123 19 10 11 55 8 38 6 10 32 59 8 17 25 -0.46 -136 0 0 8 56 26 2 7 17.9 16 123 18 9 43 22 8 9 50 10 4 21 7 49 13 -0.46 -135 0 0 8 28 27 2 7 12.0 17 124 17 9 15 14 7 42 0 9 36 9 7 21 27 -0.46 -134 0 0 8 0 54 2 7 5.8 18 124 16 8 47 32 7 14 37 9 8 23 6 54 7 -0.46 -133 0 0 7 33 48 2 6 59.2 19 124 14 8 20 17 6 47 39 8 41 3 6 27 14 -0.46 -132 0 0 7 7 9 2 6 52.4 20 124 13 7 53 28 6 21 9 8 14 11 6 0 48 -0.47 -131 0 0 6 40 57 2 6 45.2 22 124 12 7 27 7 5 55 6 7 47 46 5 34 48 -0.47 -130 0 0 6 15 12 2 6 37.7 23 125 11 7 1 14 5 29 30 7 21 48 5 9 16 -0.47 -129 0 0 5 49 56 2 6 29.8 24 125 10 6 35 48 5 4 22 6 56 19 4 44 12 -0.47 -128 0 0 5 25 7 2 6 21.7 25 125 9 6 10 51 4 39 42 6 31 18 4 19 36 -0.47 -127 0 0 5 0 47 2 6 13.3 26 125 8 5 46 23 4 15 30 6 6 45 3 55 28 -0.47 -126 0 0 4 36 56 2 6 4.6 27 125 7 5 22 23 3 51 47 5 42 42 3 31 49 -0.47 -125 0 0 4 13 33 2 5 55.7 28 126 6 4 58 52 3 28 33 5 19 7 3 8 38 -0.47 -124 0 0 3 50 40 2 5 46.4 29 126 5 4 35 50 3 5 48 4 56 1 2 45 56 -0.47 -123 0 0 3 28 16 2 5 36.9 30 126 4 4 13 18 2 43 32 4 33 25 2 23 43 -0.47 -122 0 0 3 6 21 2 5 27.1 31 126 3 3 51 15 2 21 45 4 11 19 2 2 0 -0.47 -121 0 0 2 44 56 2 5 17.1 32 126 2 3 29 42 2 0 27 3 49 42 1 40 46 -0.47 -120 0 0 2 24 0 2 5 6.8 33 127 1 3 8 38 1 39 39 3 28 35 1 20 1 -0.47 -119 0 0 2 3 34 2 4 56.3 34 127 0 2 48 5 1 19 21 3 7 58 0 59 46 -0.47 -118 0 0 1 43 38 2 4 45.6 35 127 -1 2 28 1 0 59 32 2 47 51 0 40 0 -0.47 -117 0 0 1 24 12 2 4 34.6 35 127 -2 2 8 28 0 40 13 2 28 15 0 20 45 -0.47 -116 0 0 1 5 16 2 4 23.4 36 128 -3 1 49 25 0 21 24 2 9 8 0 1 59 -0.46 -115 0 0 0 46 50 2 4 12.0 37 128 -4 1 30 52 0 3 5 1 50 32 - 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Uncertainty in time = +/- 8 secs Prediction of 2023 Jun 15.2 Data for the target star ------------------------ * name: UCAC4 307-177851 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 06 57.4391 DE: -28 39 11.172 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 06 57.4391 DE: -28 39 11.172 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (196) Philomela asteroid class: approx. diameter [km]: 140 approx. diameter ["]: 0.088 distance from Earth [AU]: 2.20330 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#130 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): 0.032", 0.019", 97.174° remarks: * orbital elements for (196)Philomela : Mean anomaly = 7.3266024084 deg Arg. of pericenter = 203.5929606065 deg Long. of node = 72.2985187141 deg Inclination = 7.2628248630 deg Eccentricity = 0.0148046725 Semimajor axis = 3.1130375880 AU Perihelion dist = 3.0669500861 AU Mag: H = 6.63, G = 0.15 Epoch of elements : MJD 60158.07805556 TDT (2023 Aug 02.0781) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1302023Apr24,21.77,2023,8,2,1.883149,-0.039531,0.411869,-3.615706,-0.347136,0.003415,0.000457,0.000001,0.000000 -66.5409,-28.6512,153.34,17.86,False UCAC4 307-177851,18.11595531,-28.6531034,0.00,11.01,0.00,0.0,0,,18.14107628,-28.6511553,1.02,0.00,0,0,0 196,Philomela,11.49,140.100,2.2033,0,0,-1.095,-1.39,,8.0,0 0,7.1332,2023,8,1,203.5930,72.2985,7.2628,0.01480,3.11304,3.06695,6.63,5.0,0.15 1.222,0.0317,0.0187,97,0.0195,Known errors,-1.00,-1,-1,-1 20230802_177851,60110.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jun 15, 05:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org